./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.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_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/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_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/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_c9253633-f459-40ab-ab17-fe769dc786a0/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 8e8985b7b99a6dec53be0ba16cc0e7b241934830d919fef1f601cc1b51084525 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:44:51,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:44:51,627 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:44:51,681 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:44:51,682 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:44:51,683 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:44:51,685 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:44:51,688 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:44:51,690 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:44:51,691 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:44:51,693 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:44:51,694 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:44:51,695 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:44:51,696 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:44:51,698 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:44:51,700 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:44:51,701 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:44:51,702 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:44:51,704 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:44:51,707 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:44:51,710 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:44:51,711 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:44:51,713 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:44:51,715 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:44:51,719 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:44:51,719 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:44:51,720 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:44:51,721 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:44:51,722 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:44:51,723 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:44:51,724 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:44:51,725 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:44:51,726 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:44:51,727 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:44:51,728 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:44:51,729 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:44:51,730 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:44:51,730 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:44:51,731 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:44:51,732 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:44:51,735 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:44:51,737 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:44:51,763 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:44:51,764 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:44:51,764 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:44:51,764 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:44:51,765 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:44:51,765 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:44:51,766 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:44:51,766 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:44:51,766 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:44:51,767 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:44:51,767 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:44:51,767 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:44:51,768 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:44:51,768 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:44:51,768 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:44:51,768 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:44:51,769 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:44:51,769 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:44:51,770 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:44:51,770 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:44:51,770 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:44:51,771 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:44:51,771 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:44:51,771 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:44:51,771 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:44:51,772 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:44:51,772 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:44:51,772 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:44:51,773 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:44:51,773 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:44:51,773 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:44:51,774 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:44:51,774 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:44:51,774 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:44:51,774 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:44:51,775 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:44:51,775 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:44:51,775 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:44:51,776 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:44:51,776 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:44:51,776 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:44:51,776 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_c9253633-f459-40ab-ab17-fe769dc786a0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8e8985b7b99a6dec53be0ba16cc0e7b241934830d919fef1f601cc1b51084525 [2021-11-23 16:44:52,011 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:44:52,052 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:44:52,055 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:44:52,057 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:44:52,058 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:44:52,060 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-23 16:44:52,154 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/f206b8aec/48dce6740a0c40b4bcddde07aef0474c/FLAG0df6cfd64 [2021-11-23 16:44:52,665 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:44:52,666 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-23 16:44:52,681 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/f206b8aec/48dce6740a0c40b4bcddde07aef0474c/FLAG0df6cfd64 [2021-11-23 16:44:53,001 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/f206b8aec/48dce6740a0c40b4bcddde07aef0474c [2021-11-23 16:44:53,004 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:44:53,005 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:44:53,007 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:44:53,008 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:44:53,011 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:44:53,012 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,014 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29888692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53, skipping insertion in model container [2021-11-23 16:44:53,014 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,022 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:44:53,056 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:44:53,296 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_c9253633-f459-40ab-ab17-fe769dc786a0/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[4900,4913] [2021-11-23 16:44:53,318 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:44:53,332 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:44:53,373 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_c9253633-f459-40ab-ab17-fe769dc786a0/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[4900,4913] [2021-11-23 16:44:53,408 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:44:53,425 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:44:53,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53 WrapperNode [2021-11-23 16:44:53,426 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:44:53,427 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:44:53,427 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:44:53,427 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:44:53,435 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,445 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,486 INFO L137 Inliner]: procedures = 23, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 342 [2021-11-23 16:44:53,488 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:44:53,489 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:44:53,490 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:44:53,491 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:44:53,500 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,500 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,516 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,517 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,534 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,538 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,540 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,561 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:44:53,562 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:44:53,562 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:44:53,563 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:44:53,564 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:53" (1/1) ... [2021-11-23 16:44:53,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:44:53,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:44:53,599 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:44:53,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:44:53,644 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:44:53,645 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:44:53,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:44:53,645 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:44:53,741 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:44:53,742 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:44:54,157 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:44:54,200 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 16:44:54,206 INFO L158 Benchmark]: Toolchain (without parser) took 1200.25ms. Allocated memory is still 104.9MB. Free memory was 70.3MB in the beginning and 48.7MB in the end (delta: 21.7MB). Peak memory consumption was 20.2MB. Max. memory is 16.1GB. [2021-11-23 16:44:54,207 INFO L158 Benchmark]: CDTParser took 0.35ms. Allocated memory is still 86.0MB. Free memory was 42.3MB in the beginning and 42.2MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:44:54,208 INFO L158 Benchmark]: CACSL2BoogieTranslator took 418.60ms. Allocated memory is still 104.9MB. Free memory was 70.1MB in the beginning and 75.4MB in the end (delta: -5.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 16:44:54,209 INFO L158 Benchmark]: Boogie Procedure Inliner took 61.51ms. Allocated memory is still 104.9MB. Free memory was 75.4MB in the beginning and 72.7MB in the end (delta: 2.7MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 16:44:54,210 INFO L158 Benchmark]: Boogie Preprocessor took 72.36ms. Allocated memory is still 104.9MB. Free memory was 72.7MB in the beginning and 71.1MB in the end (delta: 1.6MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:44:54,211 INFO L158 Benchmark]: RCFGBuilder took 642.88ms. Allocated memory is still 104.9MB. Free memory was 71.1MB in the beginning and 48.7MB in the end (delta: 22.5MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. [2021-11-23 16:44:54,214 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35ms. Allocated memory is still 86.0MB. Free memory was 42.3MB in the beginning and 42.2MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 418.60ms. Allocated memory is still 104.9MB. Free memory was 70.1MB in the beginning and 75.4MB in the end (delta: -5.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 61.51ms. Allocated memory is still 104.9MB. Free memory was 75.4MB in the beginning and 72.7MB in the end (delta: 2.7MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 72.36ms. Allocated memory is still 104.9MB. Free memory was 72.7MB in the beginning and 71.1MB in the end (delta: 1.6MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 642.88ms. Allocated memory is still 104.9MB. Free memory was 71.1MB in the beginning and 48.7MB in the end (delta: 22.5MB). Peak memory consumption was 23.1MB. 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 16:44:54,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/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_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/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_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/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_c9253633-f459-40ab-ab17-fe769dc786a0/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 8e8985b7b99a6dec53be0ba16cc0e7b241934830d919fef1f601cc1b51084525 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:44:56,589 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:44:56,591 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:44:56,621 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:44:56,622 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:44:56,624 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:44:56,626 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:44:56,628 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:44:56,631 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:44:56,632 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:44:56,633 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:44:56,635 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:44:56,636 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:44:56,637 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:44:56,639 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:44:56,641 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:44:56,642 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:44:56,643 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:44:56,645 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:44:56,648 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:44:56,650 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:44:56,655 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:44:56,657 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:44:56,659 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:44:56,663 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:44:56,669 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:44:56,670 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:44:56,673 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:44:56,675 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:44:56,676 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:44:56,677 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:44:56,678 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:44:56,680 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:44:56,681 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:44:56,683 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:44:56,683 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:44:56,684 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:44:56,685 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:44:56,685 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:44:56,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:44:56,688 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:44:56,689 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:44:56,735 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:44:56,735 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:44:56,736 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:44:56,737 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:44:56,738 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:44:56,738 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:44:56,738 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:44:56,739 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:44:56,739 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:44:56,739 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:44:56,740 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:44:56,741 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:44:56,742 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:44:56,743 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:44:56,743 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:44:56,743 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:44:56,743 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:44:56,744 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:44:56,744 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:44:56,744 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:44:56,744 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:44:56,745 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:44:56,745 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:44:56,745 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:44:56,746 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:44:56,746 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:44:56,746 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:44:56,747 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:44:56,747 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:44:56,747 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:44:56,747 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:44:56,748 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:44:56,748 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:44:56,749 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:44:56,749 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:44:56,749 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:44:56,749 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:44:56,750 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:44:56,750 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_c9253633-f459-40ab-ab17-fe769dc786a0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8e8985b7b99a6dec53be0ba16cc0e7b241934830d919fef1f601cc1b51084525 [2021-11-23 16:44:57,143 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:44:57,170 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:44:57,173 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:44:57,175 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:44:57,177 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:44:57,179 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-23 16:44:57,254 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/dfb451fc9/13b2c4535a81437e90a6dc47cb9fad1a/FLAG365142792 [2021-11-23 16:44:57,845 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:44:57,847 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-23 16:44:57,859 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/dfb451fc9/13b2c4535a81437e90a6dc47cb9fad1a/FLAG365142792 [2021-11-23 16:44:58,177 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/data/dfb451fc9/13b2c4535a81437e90a6dc47cb9fad1a [2021-11-23 16:44:58,181 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:44:58,184 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:44:58,187 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:44:58,187 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:44:58,191 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:44:58,192 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,195 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40642345 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58, skipping insertion in model container [2021-11-23 16:44:58,195 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,203 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:44:58,262 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:44:58,548 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_c9253633-f459-40ab-ab17-fe769dc786a0/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[4900,4913] [2021-11-23 16:44:58,601 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:44:58,620 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:44:58,684 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_c9253633-f459-40ab-ab17-fe769dc786a0/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[4900,4913] [2021-11-23 16:44:58,698 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:44:58,714 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:44:58,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58 WrapperNode [2021-11-23 16:44:58,715 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:44:58,716 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:44:58,716 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:44:58,716 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:44:58,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,746 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,773 INFO L137 Inliner]: procedures = 23, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 329 [2021-11-23 16:44:58,773 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:44:58,774 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:44:58,774 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:44:58,774 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:44:58,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,783 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,787 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,787 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,795 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,799 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,802 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,806 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:44:58,806 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:44:58,807 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:44:58,807 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:44:58,808 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (1/1) ... [2021-11-23 16:44:58,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:44:58,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:44:58,851 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:44:58,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:44:58,912 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:44:58,912 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:44:58,913 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:44:58,913 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:44:59,019 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:44:59,020 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:44:59,522 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:44:59,534 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:44:59,536 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 16:44:59,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:44:59 BoogieIcfgContainer [2021-11-23 16:44:59,539 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:44:59,542 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:44:59,542 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:44:59,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:44:59,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:44:58" (1/3) ... [2021-11-23 16:44:59,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17f35463 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:44:59, skipping insertion in model container [2021-11-23 16:44:59,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:44:58" (2/3) ... [2021-11-23 16:44:59,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17f35463 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:44:59, skipping insertion in model container [2021-11-23 16:44:59,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:44:59" (3/3) ... [2021-11-23 16:44:59,549 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-23 16:44:59,555 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:44:59,556 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:44:59,628 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:44:59,640 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 16:44:59,640 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:44:59,657 INFO L276 IsEmpty]: Start isEmpty. Operand has 79 states, 77 states have (on average 1.7272727272727273) internal successors, (133), 78 states have internal predecessors, (133), 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 16:44:59,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 16:44:59,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:44:59,665 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, 1, 1] [2021-11-23 16:44:59,666 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:44:59,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:44:59,671 INFO L85 PathProgramCache]: Analyzing trace with hash -347547403, now seen corresponding path program 1 times [2021-11-23 16:44:59,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:44:59,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1721139693] [2021-11-23 16:44:59,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:44:59,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:44:59,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:44:59,695 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:44:59,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:44:59,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:44:59,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:44:59,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:00,057 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 16:45:00,057 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:00,058 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:00,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1721139693] [2021-11-23 16:45:00,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1721139693] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:00,059 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:00,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:00,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498944951] [2021-11-23 16:45:00,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:00,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:00,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:00,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:00,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:00,108 INFO L87 Difference]: Start difference. First operand has 79 states, 77 states have (on average 1.7272727272727273) internal successors, (133), 78 states have internal predecessors, (133), 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 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 16:45:00,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:00,200 INFO L93 Difference]: Finished difference Result 177 states and 286 transitions. [2021-11-23 16:45:00,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:00,203 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 47 [2021-11-23 16:45:00,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:00,216 INFO L225 Difference]: With dead ends: 177 [2021-11-23 16:45:00,216 INFO L226 Difference]: Without dead ends: 118 [2021-11-23 16:45:00,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 45 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 16:45:00,225 INFO L933 BasicCegarLoop]: 196 mSDtfsCounter, 91 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:00,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 277 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:00,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-23 16:45:00,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2021-11-23 16:45:00,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.4695652173913043) internal successors, (169), 115 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 16:45:00,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 169 transitions. [2021-11-23 16:45:00,296 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 169 transitions. Word has length 47 [2021-11-23 16:45:00,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:00,296 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 169 transitions. [2021-11-23 16:45:00,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 16:45:00,297 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 169 transitions. [2021-11-23 16:45:00,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 16:45:00,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:00,299 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, 1, 1, 1] [2021-11-23 16:45:00,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:00,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:00,505 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:00,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:00,507 INFO L85 PathProgramCache]: Analyzing trace with hash -391185874, now seen corresponding path program 1 times [2021-11-23 16:45:00,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:00,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [939465944] [2021-11-23 16:45:00,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:00,509 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:00,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:00,511 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:00,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:45:00,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:00,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:45:00,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:01,251 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 16:45:01,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:01,251 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:01,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [939465944] [2021-11-23 16:45:01,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [939465944] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:01,252 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:01,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:45:01,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085841561] [2021-11-23 16:45:01,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:01,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:45:01,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:01,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:45:01,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:45:01,255 INFO L87 Difference]: Start difference. First operand 116 states and 169 transitions. Second operand has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 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 16:45:01,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:01,353 INFO L93 Difference]: Finished difference Result 209 states and 316 transitions. [2021-11-23 16:45:01,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:01,354 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 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 48 [2021-11-23 16:45:01,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:01,356 INFO L225 Difference]: With dead ends: 209 [2021-11-23 16:45:01,356 INFO L226 Difference]: Without dead ends: 119 [2021-11-23 16:45:01,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:01,359 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 22 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:01,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 239 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 40 Unchecked, 0.1s Time] [2021-11-23 16:45:01,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-23 16:45:01,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-23 16:45:01,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.4576271186440677) internal successors, (172), 118 states have internal predecessors, (172), 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 16:45:01,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 172 transitions. [2021-11-23 16:45:01,371 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 172 transitions. Word has length 48 [2021-11-23 16:45:01,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:01,372 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 172 transitions. [2021-11-23 16:45:01,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 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 16:45:01,372 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 172 transitions. [2021-11-23 16:45:01,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 16:45:01,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:01,374 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, 1, 1, 1] [2021-11-23 16:45:01,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:01,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:01,585 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:01,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:01,586 INFO L85 PathProgramCache]: Analyzing trace with hash 582777235, now seen corresponding path program 1 times [2021-11-23 16:45:01,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:01,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1969938898] [2021-11-23 16:45:01,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:01,587 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:01,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:01,589 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:01,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:45:01,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:01,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:01,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:01,805 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 16:45:01,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:01,806 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:01,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1969938898] [2021-11-23 16:45:01,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1969938898] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:01,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:01,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:01,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789857617] [2021-11-23 16:45:01,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:01,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:01,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:01,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:01,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:01,814 INFO L87 Difference]: Start difference. First operand 119 states and 172 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 16:45:01,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:01,841 INFO L93 Difference]: Finished difference Result 283 states and 432 transitions. [2021-11-23 16:45:01,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:01,842 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 48 [2021-11-23 16:45:01,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:01,848 INFO L225 Difference]: With dead ends: 283 [2021-11-23 16:45:01,848 INFO L226 Difference]: Without dead ends: 193 [2021-11-23 16:45:01,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 46 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 16:45:01,854 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 64 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 238 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 16:45:01,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 238 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:01,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-23 16:45:01,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 191. [2021-11-23 16:45:01,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.5052631578947369) internal successors, (286), 190 states have internal predecessors, (286), 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 16:45:01,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 286 transitions. [2021-11-23 16:45:01,889 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 286 transitions. Word has length 48 [2021-11-23 16:45:01,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:01,889 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 286 transitions. [2021-11-23 16:45:01,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 16:45:01,890 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 286 transitions. [2021-11-23 16:45:01,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 16:45:01,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:01,892 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, 1, 1, 1, 1] [2021-11-23 16:45:01,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:02,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:02,093 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:02,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:02,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1919644817, now seen corresponding path program 1 times [2021-11-23 16:45:02,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:02,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1320612368] [2021-11-23 16:45:02,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:02,094 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:02,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:02,096 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:02,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:45:02,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:02,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:45:02,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:02,634 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 16:45:02,634 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:02,635 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:02,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1320612368] [2021-11-23 16:45:02,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1320612368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:02,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:02,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:45:02,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493656664] [2021-11-23 16:45:02,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:02,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:45:02,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:02,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:45:02,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:45:02,638 INFO L87 Difference]: Start difference. First operand 191 states and 286 transitions. Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 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 16:45:02,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:02,703 INFO L93 Difference]: Finished difference Result 358 states and 550 transitions. [2021-11-23 16:45:02,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:02,704 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 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 49 [2021-11-23 16:45:02,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:02,707 INFO L225 Difference]: With dead ends: 358 [2021-11-23 16:45:02,707 INFO L226 Difference]: Without dead ends: 196 [2021-11-23 16:45:02,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:02,718 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 30 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:02,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 160 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 12 Unchecked, 0.0s Time] [2021-11-23 16:45:02,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-23 16:45:02,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-11-23 16:45:02,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 195 states have (on average 1.4974358974358974) internal successors, (292), 195 states have internal predecessors, (292), 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 16:45:02,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 292 transitions. [2021-11-23 16:45:02,732 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 292 transitions. Word has length 49 [2021-11-23 16:45:02,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:02,732 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 292 transitions. [2021-11-23 16:45:02,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 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 16:45:02,733 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 292 transitions. [2021-11-23 16:45:02,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 16:45:02,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:02,740 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, 1, 1, 1, 1] [2021-11-23 16:45:02,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:02,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:02,945 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:02,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:02,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1054112428, now seen corresponding path program 1 times [2021-11-23 16:45:02,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:02,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1483563419] [2021-11-23 16:45:02,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:02,947 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:02,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:02,948 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:02,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:45:03,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:03,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:03,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:03,126 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 16:45:03,126 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:03,127 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:03,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1483563419] [2021-11-23 16:45:03,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1483563419] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:03,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:03,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:03,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213233868] [2021-11-23 16:45:03,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:03,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:03,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:03,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:03,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:03,130 INFO L87 Difference]: Start difference. First operand 196 states and 292 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 16:45:03,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:03,157 INFO L93 Difference]: Finished difference Result 488 states and 754 transitions. [2021-11-23 16:45:03,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:03,158 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 49 [2021-11-23 16:45:03,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:03,161 INFO L225 Difference]: With dead ends: 488 [2021-11-23 16:45:03,161 INFO L226 Difference]: Without dead ends: 326 [2021-11-23 16:45:03,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 47 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 16:45:03,163 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 59 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 234 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 16:45:03,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 234 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:03,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-11-23 16:45:03,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 324. [2021-11-23 16:45:03,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 323 states have (on average 1.5232198142414861) internal successors, (492), 323 states have internal predecessors, (492), 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 16:45:03,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 492 transitions. [2021-11-23 16:45:03,194 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 492 transitions. Word has length 49 [2021-11-23 16:45:03,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:03,195 INFO L470 AbstractCegarLoop]: Abstraction has 324 states and 492 transitions. [2021-11-23 16:45:03,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 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 16:45:03,195 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 492 transitions. [2021-11-23 16:45:03,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 16:45:03,201 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:03,201 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, 1, 1, 1, 1, 1] [2021-11-23 16:45:03,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 16:45:03,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:03,415 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:03,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:03,416 INFO L85 PathProgramCache]: Analyzing trace with hash 322066169, now seen corresponding path program 1 times [2021-11-23 16:45:03,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:03,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1983303433] [2021-11-23 16:45:03,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:03,417 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:03,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:03,418 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:03,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:45:03,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:03,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:45:03,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:03,878 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 16:45:03,879 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:03,879 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:03,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1983303433] [2021-11-23 16:45:03,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1983303433] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:03,879 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:03,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:45:03,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736557136] [2021-11-23 16:45:03,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:03,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:45:03,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:03,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:45:03,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:45:03,882 INFO L87 Difference]: Start difference. First operand 324 states and 492 transitions. Second operand has 5 states, 5 states have (on average 10.0) internal successors, (50), 4 states have internal predecessors, (50), 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 16:45:03,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:03,961 INFO L93 Difference]: Finished difference Result 619 states and 956 transitions. [2021-11-23 16:45:03,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:03,963 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.0) internal successors, (50), 4 states have internal predecessors, (50), 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 50 [2021-11-23 16:45:03,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:03,966 INFO L225 Difference]: With dead ends: 619 [2021-11-23 16:45:03,966 INFO L226 Difference]: Without dead ends: 329 [2021-11-23 16:45:03,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:03,968 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 16 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:03,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 247 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 40 Unchecked, 0.0s Time] [2021-11-23 16:45:03,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-11-23 16:45:03,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2021-11-23 16:45:03,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 1.5182926829268293) internal successors, (498), 328 states have internal predecessors, (498), 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 16:45:03,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 498 transitions. [2021-11-23 16:45:03,999 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 498 transitions. Word has length 50 [2021-11-23 16:45:03,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:04,000 INFO L470 AbstractCegarLoop]: Abstraction has 329 states and 498 transitions. [2021-11-23 16:45:04,000 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.0) internal successors, (50), 4 states have internal predecessors, (50), 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 16:45:04,000 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 498 transitions. [2021-11-23 16:45:04,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 16:45:04,001 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:04,001 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, 1, 1, 1, 1, 1] [2021-11-23 16:45:04,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:04,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:04,212 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:04,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:04,214 INFO L85 PathProgramCache]: Analyzing trace with hash 1093929822, now seen corresponding path program 1 times [2021-11-23 16:45:04,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:04,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1411864614] [2021-11-23 16:45:04,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:04,214 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:04,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:04,215 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:04,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:45:04,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:04,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:04,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:04,386 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 16:45:04,386 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:04,386 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:04,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1411864614] [2021-11-23 16:45:04,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1411864614] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:04,387 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:04,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:04,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565798513] [2021-11-23 16:45:04,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:04,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:04,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:04,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:04,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:04,389 INFO L87 Difference]: Start difference. First operand 329 states and 498 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 16:45:04,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:04,421 INFO L93 Difference]: Finished difference Result 845 states and 1308 transitions. [2021-11-23 16:45:04,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:04,422 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 50 [2021-11-23 16:45:04,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:04,426 INFO L225 Difference]: With dead ends: 845 [2021-11-23 16:45:04,426 INFO L226 Difference]: Without dead ends: 555 [2021-11-23 16:45:04,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 48 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 16:45:04,428 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 54 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 230 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 16:45:04,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 230 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:04,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-11-23 16:45:04,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 553. [2021-11-23 16:45:04,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 552 states have (on average 1.5253623188405796) internal successors, (842), 552 states have internal predecessors, (842), 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 16:45:04,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 842 transitions. [2021-11-23 16:45:04,456 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 842 transitions. Word has length 50 [2021-11-23 16:45:04,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:04,457 INFO L470 AbstractCegarLoop]: Abstraction has 553 states and 842 transitions. [2021-11-23 16:45:04,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 16:45:04,457 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 842 transitions. [2021-11-23 16:45:04,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 16:45:04,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:04,458 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, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:04,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:04,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:04,670 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:04,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:04,671 INFO L85 PathProgramCache]: Analyzing trace with hash -562107061, now seen corresponding path program 1 times [2021-11-23 16:45:04,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:04,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [709414370] [2021-11-23 16:45:04,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:04,672 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:04,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:04,673 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:04,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:45:04,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:04,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:45:04,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:05,333 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 16:45:05,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:05,333 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:05,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [709414370] [2021-11-23 16:45:05,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [709414370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:05,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:05,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:45:05,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012355613] [2021-11-23 16:45:05,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:05,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:45:05,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:05,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:45:05,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:05,336 INFO L87 Difference]: Start difference. First operand 553 states and 842 transitions. Second operand has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 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 16:45:05,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:05,618 INFO L93 Difference]: Finished difference Result 3123 states and 4847 transitions. [2021-11-23 16:45:05,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:05,619 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 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 51 [2021-11-23 16:45:05,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:05,636 INFO L225 Difference]: With dead ends: 3123 [2021-11-23 16:45:05,636 INFO L226 Difference]: Without dead ends: 2609 [2021-11-23 16:45:05,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:05,638 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 469 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 469 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:05,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [469 Valid, 480 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:05,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2609 states. [2021-11-23 16:45:05,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2609 to 1577. [2021-11-23 16:45:05,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1577 states, 1576 states have (on average 1.5190355329949239) internal successors, (2394), 1576 states have internal predecessors, (2394), 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 16:45:05,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1577 states to 1577 states and 2394 transitions. [2021-11-23 16:45:05,770 INFO L78 Accepts]: Start accepts. Automaton has 1577 states and 2394 transitions. Word has length 51 [2021-11-23 16:45:05,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:05,771 INFO L470 AbstractCegarLoop]: Abstraction has 1577 states and 2394 transitions. [2021-11-23 16:45:05,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 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 16:45:05,771 INFO L276 IsEmpty]: Start isEmpty. Operand 1577 states and 2394 transitions. [2021-11-23 16:45:05,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 16:45:05,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:05,772 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:05,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:05,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:05,989 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:05,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:05,989 INFO L85 PathProgramCache]: Analyzing trace with hash 59171559, now seen corresponding path program 1 times [2021-11-23 16:45:05,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:05,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [878464239] [2021-11-23 16:45:05,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:05,990 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:05,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:05,991 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:05,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:45:06,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:06,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:06,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:06,201 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 16:45:06,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:06,201 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:06,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [878464239] [2021-11-23 16:45:06,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [878464239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:06,202 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:06,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:06,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120714392] [2021-11-23 16:45:06,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:06,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:06,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:06,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:06,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:06,204 INFO L87 Difference]: Start difference. First operand 1577 states and 2394 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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 16:45:06,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:06,369 INFO L93 Difference]: Finished difference Result 3853 states and 5868 transitions. [2021-11-23 16:45:06,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:06,370 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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 53 [2021-11-23 16:45:06,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:06,383 INFO L225 Difference]: With dead ends: 3853 [2021-11-23 16:45:06,383 INFO L226 Difference]: Without dead ends: 2315 [2021-11-23 16:45:06,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 51 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 16:45:06,388 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 45 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:06,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 202 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:06,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2315 states. [2021-11-23 16:45:06,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2315 to 2313. [2021-11-23 16:45:06,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2313 states, 2312 states have (on average 1.5025951557093427) internal successors, (3474), 2312 states have internal predecessors, (3474), 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 16:45:06,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2313 states to 2313 states and 3474 transitions. [2021-11-23 16:45:06,585 INFO L78 Accepts]: Start accepts. Automaton has 2313 states and 3474 transitions. Word has length 53 [2021-11-23 16:45:06,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:06,585 INFO L470 AbstractCegarLoop]: Abstraction has 2313 states and 3474 transitions. [2021-11-23 16:45:06,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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 16:45:06,586 INFO L276 IsEmpty]: Start isEmpty. Operand 2313 states and 3474 transitions. [2021-11-23 16:45:06,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 16:45:06,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:06,587 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:06,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:06,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:06,798 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:06,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:06,798 INFO L85 PathProgramCache]: Analyzing trace with hash -1811476054, now seen corresponding path program 1 times [2021-11-23 16:45:06,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:06,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1835035492] [2021-11-23 16:45:06,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:06,799 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:06,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:06,800 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:06,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:45:06,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:06,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:45:06,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:06,981 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 16:45:06,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:06,981 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:06,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1835035492] [2021-11-23 16:45:06,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1835035492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:06,982 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:06,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:45:06,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776611710] [2021-11-23 16:45:06,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:06,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:45:06,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:06,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:45:06,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:45:06,984 INFO L87 Difference]: Start difference. First operand 2313 states and 3474 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 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 16:45:07,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:07,287 INFO L93 Difference]: Finished difference Result 4275 states and 6385 transitions. [2021-11-23 16:45:07,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:45:07,288 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 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 54 [2021-11-23 16:45:07,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:07,314 INFO L225 Difference]: With dead ends: 4275 [2021-11-23 16:45:07,315 INFO L226 Difference]: Without dead ends: 4273 [2021-11-23 16:45:07,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:45:07,320 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 142 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:07,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 341 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:07,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4273 states. [2021-11-23 16:45:07,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4273 to 2425. [2021-11-23 16:45:07,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2425 states, 2424 states have (on average 1.476072607260726) internal successors, (3578), 2424 states have internal predecessors, (3578), 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 16:45:07,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2425 states to 2425 states and 3578 transitions. [2021-11-23 16:45:07,562 INFO L78 Accepts]: Start accepts. Automaton has 2425 states and 3578 transitions. Word has length 54 [2021-11-23 16:45:07,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:07,563 INFO L470 AbstractCegarLoop]: Abstraction has 2425 states and 3578 transitions. [2021-11-23 16:45:07,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 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 16:45:07,563 INFO L276 IsEmpty]: Start isEmpty. Operand 2425 states and 3578 transitions. [2021-11-23 16:45:07,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 16:45:07,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:07,566 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, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:07,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:07,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:07,777 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:07,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:07,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1690284398, now seen corresponding path program 1 times [2021-11-23 16:45:07,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:07,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [962512692] [2021-11-23 16:45:07,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:07,778 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:07,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:07,780 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:07,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:45:07,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:07,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:07,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:09,175 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:09,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:09,568 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:09,568 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:09,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [962512692] [2021-11-23 16:45:09,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [962512692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:09,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [97245548] [2021-11-23 16:45:09,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:09,569 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:09,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:45:09,572 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:45:09,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 16:45:09,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:09,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:09,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:10,752 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:10,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:10,963 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:10,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [97245548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:10,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456343944] [2021-11-23 16:45:10,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:10,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:10,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:45:10,969 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:45:10,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 16:45:11,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:11,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:11,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:12,056 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:12,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:12,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:12,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456343944] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:12,317 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:45:12,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:45:12,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599711797] [2021-11-23 16:45:12,318 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:45:12,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:45:12,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:12,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:45:12,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:45:12,321 INFO L87 Difference]: Start difference. First operand 2425 states and 3578 transitions. Second operand has 16 states, 16 states have (on average 8.625) internal successors, (138), 15 states have internal predecessors, (138), 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 16:45:12,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:12,703 INFO L93 Difference]: Finished difference Result 4169 states and 6155 transitions. [2021-11-23 16:45:12,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:45:12,704 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.625) internal successors, (138), 15 states have internal predecessors, (138), 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 76 [2021-11-23 16:45:12,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:12,719 INFO L225 Difference]: With dead ends: 4169 [2021-11-23 16:45:12,719 INFO L226 Difference]: Without dead ends: 2535 [2021-11-23 16:45:12,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:45:12,723 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 116 mSDsluCounter, 663 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 743 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:12,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 743 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 99 Invalid, 0 Unknown, 209 Unchecked, 0.1s Time] [2021-11-23 16:45:12,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2535 states. [2021-11-23 16:45:12,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2535 to 2452. [2021-11-23 16:45:12,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2452 states, 2451 states have (on average 1.4745002039983681) internal successors, (3614), 2451 states have internal predecessors, (3614), 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 16:45:12,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2452 states to 2452 states and 3614 transitions. [2021-11-23 16:45:12,915 INFO L78 Accepts]: Start accepts. Automaton has 2452 states and 3614 transitions. Word has length 76 [2021-11-23 16:45:12,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:12,917 INFO L470 AbstractCegarLoop]: Abstraction has 2452 states and 3614 transitions. [2021-11-23 16:45:12,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.625) internal successors, (138), 15 states have internal predecessors, (138), 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 16:45:12,918 INFO L276 IsEmpty]: Start isEmpty. Operand 2452 states and 3614 transitions. [2021-11-23 16:45:12,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 16:45:12,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:12,921 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, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:12,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:13,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-11-23 16:45:13,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:13,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:13,550 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:13,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:13,550 INFO L85 PathProgramCache]: Analyzing trace with hash -34257664, now seen corresponding path program 1 times [2021-11-23 16:45:13,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:13,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1188938782] [2021-11-23 16:45:13,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:13,551 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:13,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:13,555 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:13,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:45:13,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:13,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:13,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:14,310 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:14,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:14,875 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:14,876 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:14,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1188938782] [2021-11-23 16:45:14,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1188938782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:14,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [657511203] [2021-11-23 16:45:14,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:14,881 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:14,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:45:14,882 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:45:14,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 16:45:15,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:15,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:15,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:15,583 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:15,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:16,052 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:16,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [657511203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:16,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360477606] [2021-11-23 16:45:16,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:16,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:16,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:45:16,056 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:45:16,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 16:45:16,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:16,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:16,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:16,628 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:16,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:17,096 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:17,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360477606] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:17,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:45:17,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:45:17,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593148451] [2021-11-23 16:45:17,098 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:45:17,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:45:17,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:17,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:45:17,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:45:17,100 INFO L87 Difference]: Start difference. First operand 2452 states and 3614 transitions. Second operand has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 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 16:45:17,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:17,434 INFO L93 Difference]: Finished difference Result 4087 states and 6065 transitions. [2021-11-23 16:45:17,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:45:17,435 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 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 76 [2021-11-23 16:45:17,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:17,450 INFO L225 Difference]: With dead ends: 4087 [2021-11-23 16:45:17,451 INFO L226 Difference]: Without dead ends: 2453 [2021-11-23 16:45:17,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:45:17,455 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 72 mSDsluCounter, 653 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 734 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:17,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 734 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 88 Invalid, 0 Unknown, 98 Unchecked, 0.1s Time] [2021-11-23 16:45:17,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2453 states. [2021-11-23 16:45:17,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2453 to 2452. [2021-11-23 16:45:17,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2452 states, 2451 states have (on average 1.474092207262342) internal successors, (3613), 2451 states have internal predecessors, (3613), 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 16:45:17,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2452 states to 2452 states and 3613 transitions. [2021-11-23 16:45:17,649 INFO L78 Accepts]: Start accepts. Automaton has 2452 states and 3613 transitions. Word has length 76 [2021-11-23 16:45:17,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:17,649 INFO L470 AbstractCegarLoop]: Abstraction has 2452 states and 3613 transitions. [2021-11-23 16:45:17,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 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 16:45:17,650 INFO L276 IsEmpty]: Start isEmpty. Operand 2452 states and 3613 transitions. [2021-11-23 16:45:17,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 16:45:17,652 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:17,652 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, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:17,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:17,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:18,088 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-23 16:45:18,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:18,268 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:18,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:18,268 INFO L85 PathProgramCache]: Analyzing trace with hash -31046477, now seen corresponding path program 1 times [2021-11-23 16:45:18,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:18,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1076227491] [2021-11-23 16:45:18,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:18,269 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:18,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:18,269 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:18,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:45:18,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:18,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:45:18,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:18,629 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:45:18,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:18,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:18,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1076227491] [2021-11-23 16:45:18,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1076227491] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:18,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:18,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:45:18,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574744549] [2021-11-23 16:45:18,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:18,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:45:18,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:18,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:45:18,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:45:18,632 INFO L87 Difference]: Start difference. First operand 2452 states and 3613 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 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 16:45:18,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:18,830 INFO L93 Difference]: Finished difference Result 4838 states and 7150 transitions. [2021-11-23 16:45:18,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:18,831 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 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 76 [2021-11-23 16:45:18,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:18,845 INFO L225 Difference]: With dead ends: 4838 [2021-11-23 16:45:18,846 INFO L226 Difference]: Without dead ends: 2452 [2021-11-23 16:45:18,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:18,850 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 20 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:18,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 215 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 40 Unchecked, 0.0s Time] [2021-11-23 16:45:18,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2452 states. [2021-11-23 16:45:18,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2452 to 2452. [2021-11-23 16:45:19,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2452 states, 2451 states have (on average 1.4736842105263157) internal successors, (3612), 2451 states have internal predecessors, (3612), 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 16:45:19,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2452 states to 2452 states and 3612 transitions. [2021-11-23 16:45:19,014 INFO L78 Accepts]: Start accepts. Automaton has 2452 states and 3612 transitions. Word has length 76 [2021-11-23 16:45:19,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:19,014 INFO L470 AbstractCegarLoop]: Abstraction has 2452 states and 3612 transitions. [2021-11-23 16:45:19,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 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 16:45:19,015 INFO L276 IsEmpty]: Start isEmpty. Operand 2452 states and 3612 transitions. [2021-11-23 16:45:19,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:19,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:19,017 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:19,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:19,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:19,229 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:19,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:19,229 INFO L85 PathProgramCache]: Analyzing trace with hash 6265423, now seen corresponding path program 1 times [2021-11-23 16:45:19,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:19,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [987628111] [2021-11-23 16:45:19,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:19,230 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:19,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:19,231 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:19,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 16:45:19,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:19,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:19,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:19,447 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:45:19,449 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:19,449 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:19,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [987628111] [2021-11-23 16:45:19,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [987628111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:19,450 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:19,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:19,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187691237] [2021-11-23 16:45:19,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:19,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:19,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:19,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:19,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:19,454 INFO L87 Difference]: Start difference. First operand 2452 states and 3612 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 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 16:45:19,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:19,659 INFO L93 Difference]: Finished difference Result 4838 states and 7149 transitions. [2021-11-23 16:45:19,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:19,659 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 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 77 [2021-11-23 16:45:19,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:19,675 INFO L225 Difference]: With dead ends: 4838 [2021-11-23 16:45:19,675 INFO L226 Difference]: Without dead ends: 2452 [2021-11-23 16:45:19,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 75 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 16:45:19,680 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 63 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:19,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 112 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:19,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2452 states. [2021-11-23 16:45:19,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2452 to 2452. [2021-11-23 16:45:19,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2452 states, 2451 states have (on average 1.4585883312933496) internal successors, (3575), 2451 states have internal predecessors, (3575), 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 16:45:19,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2452 states to 2452 states and 3575 transitions. [2021-11-23 16:45:19,851 INFO L78 Accepts]: Start accepts. Automaton has 2452 states and 3575 transitions. Word has length 77 [2021-11-23 16:45:19,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:19,851 INFO L470 AbstractCegarLoop]: Abstraction has 2452 states and 3575 transitions. [2021-11-23 16:45:19,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 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 16:45:19,851 INFO L276 IsEmpty]: Start isEmpty. Operand 2452 states and 3575 transitions. [2021-11-23 16:45:19,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:19,853 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:19,854 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, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:19,869 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:20,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:20,065 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:20,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:20,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1946661132, now seen corresponding path program 1 times [2021-11-23 16:45:20,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:20,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [832722887] [2021-11-23 16:45:20,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:20,067 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:20,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:20,068 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:20,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:45:20,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:20,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:20,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:20,261 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:20,262 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:20,262 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:20,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [832722887] [2021-11-23 16:45:20,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [832722887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:20,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:20,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:20,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498600344] [2021-11-23 16:45:20,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:20,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:20,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:20,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:20,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:20,266 INFO L87 Difference]: Start difference. First operand 2452 states and 3575 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 16:45:20,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:20,404 INFO L93 Difference]: Finished difference Result 4840 states and 7077 transitions. [2021-11-23 16:45:20,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:20,405 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 77 [2021-11-23 16:45:20,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:20,418 INFO L225 Difference]: With dead ends: 4840 [2021-11-23 16:45:20,419 INFO L226 Difference]: Without dead ends: 2454 [2021-11-23 16:45:20,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 75 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 16:45:20,423 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 46 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 226 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 16:45:20,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 226 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:20,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2454 states. [2021-11-23 16:45:20,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2454 to 2452. [2021-11-23 16:45:20,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2452 states, 2451 states have (on average 1.4430844553243574) internal successors, (3537), 2451 states have internal predecessors, (3537), 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 16:45:20,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2452 states to 2452 states and 3537 transitions. [2021-11-23 16:45:20,598 INFO L78 Accepts]: Start accepts. Automaton has 2452 states and 3537 transitions. Word has length 77 [2021-11-23 16:45:20,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:20,599 INFO L470 AbstractCegarLoop]: Abstraction has 2452 states and 3537 transitions. [2021-11-23 16:45:20,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 16:45:20,599 INFO L276 IsEmpty]: Start isEmpty. Operand 2452 states and 3537 transitions. [2021-11-23 16:45:20,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:20,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:20,601 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:20,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:20,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:20,813 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:20,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:20,814 INFO L85 PathProgramCache]: Analyzing trace with hash 222538201, now seen corresponding path program 1 times [2021-11-23 16:45:20,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:20,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2071907499] [2021-11-23 16:45:20,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:20,815 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:20,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:20,816 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:20,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:45:20,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:20,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:20,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:21,839 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:21,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:22,212 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:22,213 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:22,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2071907499] [2021-11-23 16:45:22,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2071907499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:22,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [869264937] [2021-11-23 16:45:22,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:22,213 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:22,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:45:22,215 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:45:22,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:45:22,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:22,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:22,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:23,331 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:23,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:23,609 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:23,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [869264937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:23,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683457975] [2021-11-23 16:45:23,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:23,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:23,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:45:23,611 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:45:23,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 16:45:23,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:23,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:23,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:24,534 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:24,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:24,810 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:24,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683457975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:24,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:45:24,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:45:24,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197800075] [2021-11-23 16:45:24,811 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:45:24,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:45:24,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:24,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:45:24,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:45:24,813 INFO L87 Difference]: Start difference. First operand 2452 states and 3537 transitions. Second operand has 16 states, 16 states have (on average 9.0) internal successors, (144), 15 states have internal predecessors, (144), 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 16:45:25,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:25,091 INFO L93 Difference]: Finished difference Result 4181 states and 6046 transitions. [2021-11-23 16:45:25,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:45:25,092 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.0) internal successors, (144), 15 states have internal predecessors, (144), 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 77 [2021-11-23 16:45:25,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:25,105 INFO L225 Difference]: With dead ends: 4181 [2021-11-23 16:45:25,106 INFO L226 Difference]: Without dead ends: 2547 [2021-11-23 16:45:25,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:45:25,109 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 100 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 609 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:25,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 609 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 98 Invalid, 0 Unknown, 112 Unchecked, 0.1s Time] [2021-11-23 16:45:25,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2547 states. [2021-11-23 16:45:25,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2547 to 2464. [2021-11-23 16:45:25,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2464 states, 2463 states have (on average 1.443361753958587) internal successors, (3555), 2463 states have internal predecessors, (3555), 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 16:45:25,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2464 states to 2464 states and 3555 transitions. [2021-11-23 16:45:25,267 INFO L78 Accepts]: Start accepts. Automaton has 2464 states and 3555 transitions. Word has length 77 [2021-11-23 16:45:25,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:25,267 INFO L470 AbstractCegarLoop]: Abstraction has 2464 states and 3555 transitions. [2021-11-23 16:45:25,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.0) internal successors, (144), 15 states have internal predecessors, (144), 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 16:45:25,267 INFO L276 IsEmpty]: Start isEmpty. Operand 2464 states and 3555 transitions. [2021-11-23 16:45:25,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:25,269 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:25,269 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, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:25,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:25,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:25,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:25,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:25,872 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:25,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:25,872 INFO L85 PathProgramCache]: Analyzing trace with hash -960313949, now seen corresponding path program 1 times [2021-11-23 16:45:25,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:25,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1292098659] [2021-11-23 16:45:25,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:25,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:25,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:25,874 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:25,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:45:25,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:25,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:25,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:26,066 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:26,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:26,066 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:26,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1292098659] [2021-11-23 16:45:26,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1292098659] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:26,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:26,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:26,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111212599] [2021-11-23 16:45:26,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:26,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:26,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:26,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:26,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:26,068 INFO L87 Difference]: Start difference. First operand 2464 states and 3555 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 16:45:26,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:26,144 INFO L93 Difference]: Finished difference Result 3313 states and 4792 transitions. [2021-11-23 16:45:26,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:26,144 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 77 [2021-11-23 16:45:26,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:26,149 INFO L225 Difference]: With dead ends: 3313 [2021-11-23 16:45:26,149 INFO L226 Difference]: Without dead ends: 927 [2021-11-23 16:45:26,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 75 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 16:45:26,153 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 39 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 212 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 16:45:26,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 212 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:26,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 927 states. [2021-11-23 16:45:26,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 927 to 921. [2021-11-23 16:45:26,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 921 states, 920 states have (on average 1.4217391304347826) internal successors, (1308), 920 states have internal predecessors, (1308), 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 16:45:26,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 921 states to 921 states and 1308 transitions. [2021-11-23 16:45:26,217 INFO L78 Accepts]: Start accepts. Automaton has 921 states and 1308 transitions. Word has length 77 [2021-11-23 16:45:26,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:26,218 INFO L470 AbstractCegarLoop]: Abstraction has 921 states and 1308 transitions. [2021-11-23 16:45:26,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 16:45:26,218 INFO L276 IsEmpty]: Start isEmpty. Operand 921 states and 1308 transitions. [2021-11-23 16:45:26,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:26,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:26,220 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:26,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:26,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:26,431 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:26,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:26,432 INFO L85 PathProgramCache]: Analyzing trace with hash 1931000004, now seen corresponding path program 1 times [2021-11-23 16:45:26,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:26,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [211236945] [2021-11-23 16:45:26,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:26,433 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:26,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:26,434 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:26,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 16:45:26,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:26,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:26,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:26,653 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:45:26,654 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:26,654 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:26,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [211236945] [2021-11-23 16:45:26,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [211236945] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:26,654 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:26,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:26,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118782891] [2021-11-23 16:45:26,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:26,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:26,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:26,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:26,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:26,656 INFO L87 Difference]: Start difference. First operand 921 states and 1308 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 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 16:45:26,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:26,773 INFO L93 Difference]: Finished difference Result 1746 states and 2504 transitions. [2021-11-23 16:45:26,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:26,774 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 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 77 [2021-11-23 16:45:26,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:26,776 INFO L225 Difference]: With dead ends: 1746 [2021-11-23 16:45:26,776 INFO L226 Difference]: Without dead ends: 921 [2021-11-23 16:45:26,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 75 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 16:45:26,779 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 57 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:26,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 96 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:26,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 921 states. [2021-11-23 16:45:26,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 921 to 921. [2021-11-23 16:45:26,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 921 states, 920 states have (on average 1.4065217391304348) internal successors, (1294), 920 states have internal predecessors, (1294), 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 16:45:26,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 921 states to 921 states and 1294 transitions. [2021-11-23 16:45:26,848 INFO L78 Accepts]: Start accepts. Automaton has 921 states and 1294 transitions. Word has length 77 [2021-11-23 16:45:26,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:26,848 INFO L470 AbstractCegarLoop]: Abstraction has 921 states and 1294 transitions. [2021-11-23 16:45:26,848 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 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 16:45:26,849 INFO L276 IsEmpty]: Start isEmpty. Operand 921 states and 1294 transitions. [2021-11-23 16:45:26,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:26,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:26,850 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:26,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:27,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:27,061 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:27,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:27,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1144998027, now seen corresponding path program 1 times [2021-11-23 16:45:27,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:27,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [322229852] [2021-11-23 16:45:27,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:27,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:27,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:27,064 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:27,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 16:45:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:27,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:27,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:27,239 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:45:27,239 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:27,239 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:27,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [322229852] [2021-11-23 16:45:27,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [322229852] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:27,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:27,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:27,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256450759] [2021-11-23 16:45:27,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:27,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:27,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:27,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:27,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:27,241 INFO L87 Difference]: Start difference. First operand 921 states and 1294 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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 16:45:27,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:27,337 INFO L93 Difference]: Finished difference Result 1758 states and 2492 transitions. [2021-11-23 16:45:27,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:27,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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 77 [2021-11-23 16:45:27,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:27,340 INFO L225 Difference]: With dead ends: 1758 [2021-11-23 16:45:27,340 INFO L226 Difference]: Without dead ends: 921 [2021-11-23 16:45:27,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 75 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 16:45:27,342 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 66 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:27,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 126 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:27,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 921 states. [2021-11-23 16:45:27,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 921 to 921. [2021-11-23 16:45:27,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 921 states, 920 states have (on average 1.391304347826087) internal successors, (1280), 920 states have internal predecessors, (1280), 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 16:45:27,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 921 states to 921 states and 1280 transitions. [2021-11-23 16:45:27,394 INFO L78 Accepts]: Start accepts. Automaton has 921 states and 1280 transitions. Word has length 77 [2021-11-23 16:45:27,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:27,395 INFO L470 AbstractCegarLoop]: Abstraction has 921 states and 1280 transitions. [2021-11-23 16:45:27,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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 16:45:27,395 INFO L276 IsEmpty]: Start isEmpty. Operand 921 states and 1280 transitions. [2021-11-23 16:45:27,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 16:45:27,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:27,396 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:27,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:27,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:27,608 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:27,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:27,608 INFO L85 PathProgramCache]: Analyzing trace with hash 2034320963, now seen corresponding path program 1 times [2021-11-23 16:45:27,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:27,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1873615843] [2021-11-23 16:45:27,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:27,609 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:27,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:27,610 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:27,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:45:27,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:27,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:27,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:27,819 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:45:27,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:27,819 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:27,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1873615843] [2021-11-23 16:45:27,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1873615843] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:27,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:27,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:27,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837774143] [2021-11-23 16:45:27,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:27,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:27,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:27,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:27,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:27,821 INFO L87 Difference]: Start difference. First operand 921 states and 1280 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 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 16:45:27,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:27,905 INFO L93 Difference]: Finished difference Result 1739 states and 2445 transitions. [2021-11-23 16:45:27,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:27,905 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 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 77 [2021-11-23 16:45:27,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:27,907 INFO L225 Difference]: With dead ends: 1739 [2021-11-23 16:45:27,907 INFO L226 Difference]: Without dead ends: 896 [2021-11-23 16:45:27,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 75 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 16:45:27,909 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 64 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:27,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 130 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:27,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 896 states. [2021-11-23 16:45:27,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 896 to 896. [2021-11-23 16:45:27,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 896 states, 895 states have (on average 1.3843575418994414) internal successors, (1239), 895 states have internal predecessors, (1239), 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 16:45:27,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 896 states to 896 states and 1239 transitions. [2021-11-23 16:45:27,983 INFO L78 Accepts]: Start accepts. Automaton has 896 states and 1239 transitions. Word has length 77 [2021-11-23 16:45:27,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:27,983 INFO L470 AbstractCegarLoop]: Abstraction has 896 states and 1239 transitions. [2021-11-23 16:45:27,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 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 16:45:27,984 INFO L276 IsEmpty]: Start isEmpty. Operand 896 states and 1239 transitions. [2021-11-23 16:45:27,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 16:45:27,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:27,985 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:27,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:28,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:28,189 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:28,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:28,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1243530004, now seen corresponding path program 1 times [2021-11-23 16:45:28,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:28,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1262475453] [2021-11-23 16:45:28,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:28,190 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:28,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:28,191 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:28,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 16:45:28,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:28,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:28,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:28,374 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:28,374 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:28,375 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:28,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1262475453] [2021-11-23 16:45:28,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1262475453] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:28,375 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:28,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:28,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828471705] [2021-11-23 16:45:28,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:28,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:28,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:28,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:28,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:28,376 INFO L87 Difference]: Start difference. First operand 896 states and 1239 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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 16:45:28,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:28,407 INFO L93 Difference]: Finished difference Result 1308 states and 1817 transitions. [2021-11-23 16:45:28,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:28,408 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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 78 [2021-11-23 16:45:28,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:28,409 INFO L225 Difference]: With dead ends: 1308 [2021-11-23 16:45:28,409 INFO L226 Difference]: Without dead ends: 490 [2021-11-23 16:45:28,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 76 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 16:45:28,411 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 32 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 193 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 16:45:28,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 193 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:28,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-11-23 16:45:28,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 488. [2021-11-23 16:45:28,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 1.3449691991786448) internal successors, (655), 487 states have internal predecessors, (655), 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 16:45:28,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 655 transitions. [2021-11-23 16:45:28,442 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 655 transitions. Word has length 78 [2021-11-23 16:45:28,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:28,443 INFO L470 AbstractCegarLoop]: Abstraction has 488 states and 655 transitions. [2021-11-23 16:45:28,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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 16:45:28,443 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 655 transitions. [2021-11-23 16:45:28,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 16:45:28,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:28,444 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:28,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:28,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:28,656 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:28,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:28,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1311232263, now seen corresponding path program 1 times [2021-11-23 16:45:28,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:28,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [451040898] [2021-11-23 16:45:28,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:28,657 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:28,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:28,658 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:28,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 16:45:28,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:28,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:28,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:29,665 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:29,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:30,113 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:30,113 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:30,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [451040898] [2021-11-23 16:45:30,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [451040898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:30,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [654063670] [2021-11-23 16:45:30,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:30,114 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:30,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:45:30,121 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:45:30,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 16:45:30,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:30,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:30,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:31,186 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:31,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:31,545 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:31,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [654063670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:31,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731065167] [2021-11-23 16:45:31,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:31,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:31,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:45:31,549 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:45:31,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 16:45:31,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:31,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:45:31,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:32,453 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:32,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:32,742 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:32,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731065167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:32,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:45:32,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:45:32,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256599338] [2021-11-23 16:45:32,743 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:45:32,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:45:32,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:32,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:45:32,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:45:32,744 INFO L87 Difference]: Start difference. First operand 488 states and 655 transitions. Second operand has 16 states, 16 states have (on average 9.375) internal successors, (150), 15 states have internal predecessors, (150), 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 16:45:32,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:32,883 INFO L93 Difference]: Finished difference Result 912 states and 1250 transitions. [2021-11-23 16:45:32,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 16:45:32,884 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.375) internal successors, (150), 15 states have internal predecessors, (150), 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 78 [2021-11-23 16:45:32,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:32,885 INFO L225 Difference]: With dead ends: 912 [2021-11-23 16:45:32,885 INFO L226 Difference]: Without dead ends: 502 [2021-11-23 16:45:32,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:45:32,886 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 86 mSDsluCounter, 624 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:32,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 700 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 42 Invalid, 0 Unknown, 81 Unchecked, 0.0s Time] [2021-11-23 16:45:32,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-11-23 16:45:32,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 500. [2021-11-23 16:45:32,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 1.348697394789579) internal successors, (673), 499 states have internal predecessors, (673), 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 16:45:32,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 673 transitions. [2021-11-23 16:45:32,912 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 673 transitions. Word has length 78 [2021-11-23 16:45:32,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:32,913 INFO L470 AbstractCegarLoop]: Abstraction has 500 states and 673 transitions. [2021-11-23 16:45:32,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.375) internal successors, (150), 15 states have internal predecessors, (150), 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 16:45:32,913 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 673 transitions. [2021-11-23 16:45:32,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:45:32,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:32,914 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 16:45:32,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:33,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 16:45:33,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:33,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:33,517 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:33,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:33,517 INFO L85 PathProgramCache]: Analyzing trace with hash -2107687664, now seen corresponding path program 1 times [2021-11-23 16:45:33,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:33,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [453563909] [2021-11-23 16:45:33,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:33,518 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:33,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:33,519 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:33,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 16:45:33,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:33,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:45:33,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:33,740 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:33,740 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:33,740 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:33,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [453563909] [2021-11-23 16:45:33,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [453563909] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:33,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:33,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:45:33,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374581836] [2021-11-23 16:45:33,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:33,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:45:33,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:33,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:45:33,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:45:33,741 INFO L87 Difference]: Start difference. First operand 500 states and 673 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 16:45:33,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:33,765 INFO L93 Difference]: Finished difference Result 708 states and 960 transitions. [2021-11-23 16:45:33,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:45:33,765 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 79 [2021-11-23 16:45:33,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:33,766 INFO L225 Difference]: With dead ends: 708 [2021-11-23 16:45:33,766 INFO L226 Difference]: Without dead ends: 298 [2021-11-23 16:45:33,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 77 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 16:45:33,767 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 26 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 176 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 16:45:33,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 176 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:45:33,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-23 16:45:33,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 296. [2021-11-23 16:45:33,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 295 states have (on average 1.2983050847457627) internal successors, (383), 295 states have internal predecessors, (383), 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 16:45:33,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 383 transitions. [2021-11-23 16:45:33,806 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 383 transitions. Word has length 79 [2021-11-23 16:45:33,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:33,806 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 383 transitions. [2021-11-23 16:45:33,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 16:45:33,806 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 383 transitions. [2021-11-23 16:45:33,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:45:33,807 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:33,807 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:33,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:34,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:34,019 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:34,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:34,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1748552464, now seen corresponding path program 1 times [2021-11-23 16:45:34,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:34,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1012122786] [2021-11-23 16:45:34,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:34,020 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:34,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:34,020 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:34,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 16:45:34,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:34,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:45:34,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:34,626 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:45:34,626 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:34,626 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:34,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1012122786] [2021-11-23 16:45:34,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1012122786] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:34,627 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:34,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:45:34,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076006911] [2021-11-23 16:45:34,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:34,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:45:34,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:34,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:45:34,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:34,628 INFO L87 Difference]: Start difference. First operand 296 states and 383 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 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 16:45:34,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:34,752 INFO L93 Difference]: Finished difference Result 660 states and 878 transitions. [2021-11-23 16:45:34,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:34,753 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 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 79 [2021-11-23 16:45:34,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:34,755 INFO L225 Difference]: With dead ends: 660 [2021-11-23 16:45:34,755 INFO L226 Difference]: Without dead ends: 590 [2021-11-23 16:45:34,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:34,756 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 328 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:34,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [328 Valid, 559 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:34,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-11-23 16:45:34,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 442. [2021-11-23 16:45:34,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 441 states have (on average 1.3038548752834467) internal successors, (575), 441 states have internal predecessors, (575), 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 16:45:34,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 575 transitions. [2021-11-23 16:45:34,798 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 575 transitions. Word has length 79 [2021-11-23 16:45:34,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:34,799 INFO L470 AbstractCegarLoop]: Abstraction has 442 states and 575 transitions. [2021-11-23 16:45:34,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 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 16:45:34,799 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 575 transitions. [2021-11-23 16:45:34,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:45:34,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:34,800 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:34,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:35,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:35,012 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:35,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:35,012 INFO L85 PathProgramCache]: Analyzing trace with hash -33447248, now seen corresponding path program 1 times [2021-11-23 16:45:35,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:35,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [101269043] [2021-11-23 16:45:35,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:35,013 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:35,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:35,014 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:35,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 16:45:35,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:35,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:45:35,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:35,636 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:45:35,636 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:35,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:35,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [101269043] [2021-11-23 16:45:35,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [101269043] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:35,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:35,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:45:35,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004303960] [2021-11-23 16:45:35,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:35,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:45:35,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:35,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:45:35,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:35,638 INFO L87 Difference]: Start difference. First operand 442 states and 575 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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 16:45:35,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:35,780 INFO L93 Difference]: Finished difference Result 738 states and 980 transitions. [2021-11-23 16:45:35,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:35,780 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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 79 [2021-11-23 16:45:35,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:35,782 INFO L225 Difference]: With dead ends: 738 [2021-11-23 16:45:35,782 INFO L226 Difference]: Without dead ends: 668 [2021-11-23 16:45:35,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:35,784 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 427 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:35,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [427 Valid, 483 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:35,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-11-23 16:45:35,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 514. [2021-11-23 16:45:35,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 1.304093567251462) internal successors, (669), 513 states have internal predecessors, (669), 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 16:45:35,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 669 transitions. [2021-11-23 16:45:35,824 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 669 transitions. Word has length 79 [2021-11-23 16:45:35,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:35,825 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 669 transitions. [2021-11-23 16:45:35,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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 16:45:35,825 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 669 transitions. [2021-11-23 16:45:35,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:45:35,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:35,826 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:35,853 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 16:45:36,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:36,038 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:36,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:36,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1312301421, now seen corresponding path program 1 times [2021-11-23 16:45:36,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:36,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1746508873] [2021-11-23 16:45:36,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:36,039 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:36,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:36,040 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:36,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 16:45:36,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:36,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:45:36,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:36,630 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:45:36,630 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:36,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:36,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1746508873] [2021-11-23 16:45:36,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1746508873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:36,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:36,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:45:36,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938502122] [2021-11-23 16:45:36,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:36,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:45:36,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:36,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:45:36,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:36,632 INFO L87 Difference]: Start difference. First operand 514 states and 669 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 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 16:45:36,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:36,759 INFO L93 Difference]: Finished difference Result 806 states and 1070 transitions. [2021-11-23 16:45:36,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:36,760 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 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 79 [2021-11-23 16:45:36,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:36,761 INFO L225 Difference]: With dead ends: 806 [2021-11-23 16:45:36,761 INFO L226 Difference]: Without dead ends: 600 [2021-11-23 16:45:36,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:36,762 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 389 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:36,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [389 Valid, 567 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:36,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2021-11-23 16:45:36,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 446. [2021-11-23 16:45:36,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 1.2876404494382023) internal successors, (573), 445 states have internal predecessors, (573), 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 16:45:36,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 573 transitions. [2021-11-23 16:45:36,797 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 573 transitions. Word has length 79 [2021-11-23 16:45:36,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:36,797 INFO L470 AbstractCegarLoop]: Abstraction has 446 states and 573 transitions. [2021-11-23 16:45:36,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 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 16:45:36,798 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 573 transitions. [2021-11-23 16:45:36,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:45:36,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:36,798 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:36,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-23 16:45:36,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:36,999 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:36,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:36,999 INFO L85 PathProgramCache]: Analyzing trace with hash -1345590733, now seen corresponding path program 1 times [2021-11-23 16:45:36,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:36,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [436588109] [2021-11-23 16:45:36,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:37,000 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:37,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:37,000 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:37,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 16:45:37,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:37,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:45:37,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:37,612 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:45:37,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:45:37,612 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:37,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [436588109] [2021-11-23 16:45:37,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [436588109] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:45:37,613 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:45:37,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:45:37,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133386459] [2021-11-23 16:45:37,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:45:37,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:45:37,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:37,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:45:37,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:37,614 INFO L87 Difference]: Start difference. First operand 446 states and 573 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 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 16:45:37,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:37,738 INFO L93 Difference]: Finished difference Result 742 states and 978 transitions. [2021-11-23 16:45:37,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:45:37,738 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 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 79 [2021-11-23 16:45:37,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:37,740 INFO L225 Difference]: With dead ends: 742 [2021-11-23 16:45:37,740 INFO L226 Difference]: Without dead ends: 672 [2021-11-23 16:45:37,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:45:37,741 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 356 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:37,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [356 Valid, 561 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:45:37,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2021-11-23 16:45:37,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 524. [2021-11-23 16:45:37,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 524 states, 523 states have (on average 1.2906309751434035) internal successors, (675), 523 states have internal predecessors, (675), 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 16:45:37,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 524 states to 524 states and 675 transitions. [2021-11-23 16:45:37,786 INFO L78 Accepts]: Start accepts. Automaton has 524 states and 675 transitions. Word has length 79 [2021-11-23 16:45:37,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:37,787 INFO L470 AbstractCegarLoop]: Abstraction has 524 states and 675 transitions. [2021-11-23 16:45:37,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 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 16:45:37,787 INFO L276 IsEmpty]: Start isEmpty. Operand 524 states and 675 transitions. [2021-11-23 16:45:37,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 16:45:37,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:37,788 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:37,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:37,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:45:37,989 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:37,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:37,990 INFO L85 PathProgramCache]: Analyzing trace with hash 916702534, now seen corresponding path program 1 times [2021-11-23 16:45:37,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:37,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [355415433] [2021-11-23 16:45:37,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:37,990 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:37,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:37,991 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:37,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 16:45:38,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:38,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:45:38,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:38,786 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:38,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:38,991 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:38,991 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:38,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [355415433] [2021-11-23 16:45:38,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [355415433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:38,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1484218311] [2021-11-23 16:45:38,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:38,992 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:38,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:45:38,992 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:45:38,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 16:45:39,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:39,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:45:39,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:43,267 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:43,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:46,597 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:46,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1484218311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:46,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425629440] [2021-11-23 16:45:46,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:46,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:45:46,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:45:46,599 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:45:46,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 16:45:46,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:46,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:45:46,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:48,381 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:48,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:49,029 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:49,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425629440] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:49,029 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:45:49,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 26, 24, 10, 9] total 76 [2021-11-23 16:45:49,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632582805] [2021-11-23 16:45:49,030 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:45:49,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-23 16:45:49,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:45:49,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-23 16:45:49,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=5168, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 16:45:49,034 INFO L87 Difference]: Start difference. First operand 524 states and 675 transitions. Second operand has 76 states, 76 states have (on average 5.078947368421052) internal successors, (386), 76 states have internal predecessors, (386), 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 16:45:51,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:45:51,611 INFO L93 Difference]: Finished difference Result 678 states and 878 transitions. [2021-11-23 16:45:51,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 16:45:51,612 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 5.078947368421052) internal successors, (386), 76 states have internal predecessors, (386), 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 80 [2021-11-23 16:45:51,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:45:51,613 INFO L225 Difference]: With dead ends: 678 [2021-11-23 16:45:51,613 INFO L226 Difference]: Without dead ends: 514 [2021-11-23 16:45:51,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 404 SyntacticMatches, 4 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2735 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=837, Invalid=6995, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 16:45:51,616 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 220 mSDsluCounter, 1648 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 1721 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 225 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:45:51,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 1721 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 239 Invalid, 0 Unknown, 225 Unchecked, 0.3s Time] [2021-11-23 16:45:51,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2021-11-23 16:45:51,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 502. [2021-11-23 16:45:51,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 1.2894211576846308) internal successors, (646), 501 states have internal predecessors, (646), 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 16:45:51,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 646 transitions. [2021-11-23 16:45:51,652 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 646 transitions. Word has length 80 [2021-11-23 16:45:51,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:45:51,652 INFO L470 AbstractCegarLoop]: Abstraction has 502 states and 646 transitions. [2021-11-23 16:45:51,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 5.078947368421052) internal successors, (386), 76 states have internal predecessors, (386), 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 16:45:51,652 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 646 transitions. [2021-11-23 16:45:51,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 16:45:51,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:45:51,653 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:45:51,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 16:45:51,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-23 16:45:52,056 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-23 16:45:52,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:52,254 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:45:52,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:45:52,254 INFO L85 PathProgramCache]: Analyzing trace with hash 230432137, now seen corresponding path program 1 times [2021-11-23 16:45:52,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:45:52,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1604856189] [2021-11-23 16:45:52,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:52,255 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:45:52,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:45:52,256 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:45:52,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 16:45:52,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:52,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 16:45:52,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:45:56,712 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:56,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:45:59,168 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:45:59,169 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:45:59,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1604856189] [2021-11-23 16:45:59,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1604856189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:45:59,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [488140115] [2021-11-23 16:45:59,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:45:59,170 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:45:59,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:45:59,171 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:45:59,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 16:45:59,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:45:59,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:45:59,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:02,377 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:02,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:03,277 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:03,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [488140115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:03,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170660747] [2021-11-23 16:46:03,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:03,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:46:03,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:03,278 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:46:03,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 16:46:03,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:03,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:46:03,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:10,619 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:10,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:12,164 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:12,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170660747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:12,164 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:46:12,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 28, 24, 29, 26] total 73 [2021-11-23 16:46:12,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432661307] [2021-11-23 16:46:12,165 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:46:12,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-23 16:46:12,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:12,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-23 16:46:12,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=4549, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 16:46:12,168 INFO L87 Difference]: Start difference. First operand 502 states and 646 transitions. Second operand has 73 states, 73 states have (on average 2.8767123287671232) internal successors, (210), 73 states have internal predecessors, (210), 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 16:46:13,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:13,065 INFO L93 Difference]: Finished difference Result 849 states and 1083 transitions. [2021-11-23 16:46:13,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 16:46:13,066 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.8767123287671232) internal successors, (210), 73 states have internal predecessors, (210), 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 80 [2021-11-23 16:46:13,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:13,067 INFO L225 Difference]: With dead ends: 849 [2021-11-23 16:46:13,067 INFO L226 Difference]: Without dead ends: 707 [2021-11-23 16:46:13,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2142 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=804, Invalid=5048, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 16:46:13,070 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 239 mSDsluCounter, 1544 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 1637 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 280 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:13,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 1637 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 308 Invalid, 0 Unknown, 280 Unchecked, 0.3s Time] [2021-11-23 16:46:13,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 707 states. [2021-11-23 16:46:13,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 707 to 513. [2021-11-23 16:46:13,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 1.287109375) internal successors, (659), 512 states have internal predecessors, (659), 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 16:46:13,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 659 transitions. [2021-11-23 16:46:13,108 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 659 transitions. Word has length 80 [2021-11-23 16:46:13,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:13,108 INFO L470 AbstractCegarLoop]: Abstraction has 513 states and 659 transitions. [2021-11-23 16:46:13,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.8767123287671232) internal successors, (210), 73 states have internal predecessors, (210), 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 16:46:13,108 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 659 transitions. [2021-11-23 16:46:13,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 16:46:13,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:13,109 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:13,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-23 16:46:13,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:13,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:13,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:46:13,714 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:13,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:13,714 INFO L85 PathProgramCache]: Analyzing trace with hash -512456061, now seen corresponding path program 1 times [2021-11-23 16:46:13,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:13,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1191160137] [2021-11-23 16:46:13,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:13,715 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:13,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:13,716 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:13,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 16:46:13,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:13,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:46:13,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:16,029 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:16,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:16,909 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:16,909 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:16,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1191160137] [2021-11-23 16:46:16,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1191160137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:16,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1543901638] [2021-11-23 16:46:16,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:16,910 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:46:16,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:46:16,911 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:46:16,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 16:46:17,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:17,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:46:17,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:19,506 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:19,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:19,880 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:19,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1543901638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:19,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787668216] [2021-11-23 16:46:19,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:19,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:46:19,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:19,881 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:46:19,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 16:46:19,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:19,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:46:19,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:23,931 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:23,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:27,631 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:27,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787668216] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:27,632 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:46:27,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 18, 13, 25, 26] total 87 [2021-11-23 16:46:27,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020238370] [2021-11-23 16:46:27,632 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:46:27,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-23 16:46:27,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:27,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-23 16:46:27,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=924, Invalid=6558, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 16:46:27,637 INFO L87 Difference]: Start difference. First operand 513 states and 659 transitions. Second operand has 87 states, 87 states have (on average 3.8735632183908044) internal successors, (337), 87 states have internal predecessors, (337), 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 16:46:28,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:28,768 INFO L93 Difference]: Finished difference Result 1170 states and 1488 transitions. [2021-11-23 16:46:28,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 16:46:28,769 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.8735632183908044) internal successors, (337), 87 states have internal predecessors, (337), 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 80 [2021-11-23 16:46:28,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:28,771 INFO L225 Difference]: With dead ends: 1170 [2021-11-23 16:46:28,771 INFO L226 Difference]: Without dead ends: 1018 [2021-11-23 16:46:28,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 390 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3668 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=1046, Invalid=7326, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 16:46:28,774 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 309 mSDsluCounter, 2845 mSDsCounter, 0 mSdLazyCounter, 555 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 309 SdHoareTripleChecker+Valid, 2983 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 392 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:28,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [309 Valid, 2983 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 555 Invalid, 0 Unknown, 392 Unchecked, 0.6s Time] [2021-11-23 16:46:28,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1018 states. [2021-11-23 16:46:28,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1018 to 514. [2021-11-23 16:46:28,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 1.286549707602339) internal successors, (660), 513 states have internal predecessors, (660), 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 16:46:28,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 660 transitions. [2021-11-23 16:46:28,815 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 660 transitions. Word has length 80 [2021-11-23 16:46:28,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:28,815 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 660 transitions. [2021-11-23 16:46:28,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.8735632183908044) internal successors, (337), 87 states have internal predecessors, (337), 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 16:46:28,815 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 660 transitions. [2021-11-23 16:46:28,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:46:28,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:28,816 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:28,823 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-23 16:46:29,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:29,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:29,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:46:29,422 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:29,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:29,422 INFO L85 PathProgramCache]: Analyzing trace with hash -513709199, now seen corresponding path program 1 times [2021-11-23 16:46:29,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:29,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1629944516] [2021-11-23 16:46:29,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:29,423 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:29,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:29,423 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:29,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 16:46:29,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:29,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:46:29,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:31,556 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:31,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:32,405 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:32,405 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:32,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1629944516] [2021-11-23 16:46:32,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1629944516] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:32,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1589856046] [2021-11-23 16:46:32,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:32,406 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:46:32,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:46:32,407 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:46:32,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 16:46:32,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:32,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:46:32,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:34,464 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:34,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:34,836 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:34,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1589856046] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:34,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205849666] [2021-11-23 16:46:34,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:34,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:46:34,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:34,837 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:46:34,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-23 16:46:34,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:34,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 16:46:34,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:37,134 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:37,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:38,487 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:38,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205849666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:38,487 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:46:38,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 17, 16] total 49 [2021-11-23 16:46:38,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25585305] [2021-11-23 16:46:38,487 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:46:38,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 16:46:38,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:38,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 16:46:38,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1986, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 16:46:38,489 INFO L87 Difference]: Start difference. First operand 514 states and 660 transitions. Second operand has 49 states, 49 states have (on average 5.040816326530612) internal successors, (247), 49 states have internal predecessors, (247), 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 16:46:38,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:38,662 INFO L93 Difference]: Finished difference Result 844 states and 1079 transitions. [2021-11-23 16:46:38,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 16:46:38,663 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 5.040816326530612) internal successors, (247), 49 states have internal predecessors, (247), 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 81 [2021-11-23 16:46:38,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:38,664 INFO L225 Difference]: With dead ends: 844 [2021-11-23 16:46:38,664 INFO L226 Difference]: Without dead ends: 702 [2021-11-23 16:46:38,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 433 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=394, Invalid=2056, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 16:46:38,666 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 252 mSDsluCounter, 1134 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 1240 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 237 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:38,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 1240 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 62 Invalid, 0 Unknown, 237 Unchecked, 0.1s Time] [2021-11-23 16:46:38,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-11-23 16:46:38,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 514. [2021-11-23 16:46:38,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 1.286549707602339) internal successors, (660), 513 states have internal predecessors, (660), 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 16:46:38,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 660 transitions. [2021-11-23 16:46:38,715 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 660 transitions. Word has length 81 [2021-11-23 16:46:38,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:38,715 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 660 transitions. [2021-11-23 16:46:38,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 5.040816326530612) internal successors, (247), 49 states have internal predecessors, (247), 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 16:46:38,715 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 660 transitions. [2021-11-23 16:46:38,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:46:38,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:38,716 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:38,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:38,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:39,137 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-23 16:46:39,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:46:39,317 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:39,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:39,318 INFO L85 PathProgramCache]: Analyzing trace with hash -1256597397, now seen corresponding path program 1 times [2021-11-23 16:46:39,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:39,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2120249378] [2021-11-23 16:46:39,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:39,318 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:39,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:39,319 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:39,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 16:46:39,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:39,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:46:39,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:41,475 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:41,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:42,257 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:42,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:42,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2120249378] [2021-11-23 16:46:42,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2120249378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:42,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1211252689] [2021-11-23 16:46:42,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:42,258 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:46:42,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:46:42,259 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:46:42,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-23 16:46:42,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:42,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:46:42,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:44,279 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:44,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:45,228 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:45,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1211252689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:45,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075595255] [2021-11-23 16:46:45,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:45,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:46:45,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:45,230 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:46:45,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-23 16:46:45,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:45,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:46:45,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:47,455 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:47,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:46:49,088 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:49,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075595255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:46:49,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:46:49,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15, 14, 14, 15] total 74 [2021-11-23 16:46:49,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38220332] [2021-11-23 16:46:49,089 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:46:49,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-23 16:46:49,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:49,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-23 16:46:49,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=4901, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 16:46:49,092 INFO L87 Difference]: Start difference. First operand 514 states and 660 transitions. Second operand has 74 states, 74 states have (on average 5.216216216216216) internal successors, (386), 74 states have internal predecessors, (386), 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 16:46:50,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:50,986 INFO L93 Difference]: Finished difference Result 1154 states and 1469 transitions. [2021-11-23 16:46:50,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 16:46:50,987 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 5.216216216216216) internal successors, (386), 74 states have internal predecessors, (386), 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 81 [2021-11-23 16:46:50,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:50,989 INFO L225 Difference]: With dead ends: 1154 [2021-11-23 16:46:50,989 INFO L226 Difference]: Without dead ends: 1002 [2021-11-23 16:46:50,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 415 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3131 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=837, Invalid=7353, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 16:46:50,993 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 293 mSDsluCounter, 4289 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 4416 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 322 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:50,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 4416 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 543 Invalid, 0 Unknown, 322 Unchecked, 0.5s Time] [2021-11-23 16:46:50,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2021-11-23 16:46:51,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 494. [2021-11-23 16:46:51,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 493 states have (on average 1.2900608519269776) internal successors, (636), 493 states have internal predecessors, (636), 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 16:46:51,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 636 transitions. [2021-11-23 16:46:51,035 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 636 transitions. Word has length 81 [2021-11-23 16:46:51,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:51,036 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 636 transitions. [2021-11-23 16:46:51,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 5.216216216216216) internal successors, (386), 74 states have internal predecessors, (386), 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 16:46:51,036 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 636 transitions. [2021-11-23 16:46:51,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:46:51,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:51,037 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:51,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:51,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-23 16:46:51,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:51,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:46:51,642 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:51,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:51,642 INFO L85 PathProgramCache]: Analyzing trace with hash 697899982, now seen corresponding path program 1 times [2021-11-23 16:46:51,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:51,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [676295880] [2021-11-23 16:46:51,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:51,643 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:51,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:51,644 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:51,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-23 16:46:51,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:51,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:46:51,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:01,019 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:01,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:07,624 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:07,625 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:07,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [676295880] [2021-11-23 16:47:07,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [676295880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:07,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [785493989] [2021-11-23 16:47:07,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:07,625 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:07,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:07,626 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:07,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-23 16:47:07,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:07,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:47:07,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:15,762 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:15,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:19,851 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:19,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [785493989] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:19,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501019993] [2021-11-23 16:47:19,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:19,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:19,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:19,853 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:19,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-23 16:47:19,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:19,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:47:19,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:31,017 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:31,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:33,576 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:33,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501019993] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:33,576 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:33,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 26, 25, 29, 24] total 88 [2021-11-23 16:47:33,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221522585] [2021-11-23 16:47:33,577 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:33,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 16:47:33,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:33,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 16:47:33,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=6941, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 16:47:33,579 INFO L87 Difference]: Start difference. First operand 494 states and 636 transitions. Second operand has 88 states, 88 states have (on average 3.0681818181818183) internal successors, (270), 88 states have internal predecessors, (270), 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 16:47:34,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:34,006 INFO L93 Difference]: Finished difference Result 660 states and 855 transitions. [2021-11-23 16:47:34,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:47:34,007 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 3.0681818181818183) internal successors, (270), 88 states have internal predecessors, (270), 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 81 [2021-11-23 16:47:34,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:34,008 INFO L225 Difference]: With dead ends: 660 [2021-11-23 16:47:34,009 INFO L226 Difference]: Without dead ends: 522 [2021-11-23 16:47:34,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 392 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3597 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=750, Invalid=7082, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 16:47:34,011 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 179 mSDsluCounter, 1627 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 1692 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 247 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:34,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 1692 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 247 Unchecked, 0.1s Time] [2021-11-23 16:47:34,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-11-23 16:47:34,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 510. [2021-11-23 16:47:34,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 510 states, 509 states have (on average 1.2868369351669942) internal successors, (655), 509 states have internal predecessors, (655), 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 16:47:34,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 655 transitions. [2021-11-23 16:47:34,062 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 655 transitions. Word has length 81 [2021-11-23 16:47:34,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:34,063 INFO L470 AbstractCegarLoop]: Abstraction has 510 states and 655 transitions. [2021-11-23 16:47:34,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 3.0681818181818183) internal successors, (270), 88 states have internal predecessors, (270), 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 16:47:34,063 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 655 transitions. [2021-11-23 16:47:34,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:47:34,063 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:34,063 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:34,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:34,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:34,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:34,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:34,665 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:34,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:34,666 INFO L85 PathProgramCache]: Analyzing trace with hash 701073899, now seen corresponding path program 1 times [2021-11-23 16:47:34,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:34,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [159976777] [2021-11-23 16:47:34,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:34,666 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:34,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:34,667 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:34,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-23 16:47:34,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:34,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:34,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:34,971 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 16:47:34,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:35,138 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 16:47:35,138 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:35,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [159976777] [2021-11-23 16:47:35,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [159976777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:35,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [853450413] [2021-11-23 16:47:35,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:35,139 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:35,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:35,140 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:35,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-11-23 16:47:35,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:35,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:35,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:35,527 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:35,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:35,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [853450413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:35,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822972153] [2021-11-23 16:47:35,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:35,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:35,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:35,694 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:35,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-23 16:47:35,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:35,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:35,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:36,100 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 16:47:36,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:36,299 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 16:47:36,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822972153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:36,300 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:36,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 16:47:36,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232040975] [2021-11-23 16:47:36,300 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:36,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:47:36,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:36,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:47:36,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:36,302 INFO L87 Difference]: Start difference. First operand 510 states and 655 transitions. Second operand has 6 states, 6 states have (on average 26.166666666666668) internal successors, (157), 6 states have internal predecessors, (157), 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 16:47:36,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:36,492 INFO L93 Difference]: Finished difference Result 1560 states and 2016 transitions. [2021-11-23 16:47:36,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:36,493 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 26.166666666666668) internal successors, (157), 6 states have internal predecessors, (157), 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 81 [2021-11-23 16:47:36,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:36,495 INFO L225 Difference]: With dead ends: 1560 [2021-11-23 16:47:36,496 INFO L226 Difference]: Without dead ends: 1150 [2021-11-23 16:47:36,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 473 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:47:36,498 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 220 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:36,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 449 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 20 Invalid, 0 Unknown, 8 Unchecked, 0.0s Time] [2021-11-23 16:47:36,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2021-11-23 16:47:36,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 1098. [2021-11-23 16:47:36,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1098 states, 1097 states have (on average 1.269826800364631) internal successors, (1393), 1097 states have internal predecessors, (1393), 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 16:47:36,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1098 states to 1098 states and 1393 transitions. [2021-11-23 16:47:36,638 INFO L78 Accepts]: Start accepts. Automaton has 1098 states and 1393 transitions. Word has length 81 [2021-11-23 16:47:36,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:36,638 INFO L470 AbstractCegarLoop]: Abstraction has 1098 states and 1393 transitions. [2021-11-23 16:47:36,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 26.166666666666668) internal successors, (157), 6 states have internal predecessors, (157), 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 16:47:36,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1098 states and 1393 transitions. [2021-11-23 16:47:36,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:47:36,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:36,639 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:36,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:36,862 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-23 16:47:37,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (56)] Ended with exit code 0 [2021-11-23 16:47:37,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:37,240 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:37,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:37,241 INFO L85 PathProgramCache]: Analyzing trace with hash 872084376, now seen corresponding path program 1 times [2021-11-23 16:47:37,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:37,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [563636519] [2021-11-23 16:47:37,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:37,241 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:37,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:37,242 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:37,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 16:47:37,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:37,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:47:37,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:39,543 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:39,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:40,371 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:40,371 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:40,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [563636519] [2021-11-23 16:47:40,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [563636519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:40,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [31556242] [2021-11-23 16:47:40,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:40,371 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:40,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:40,372 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:40,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-23 16:47:40,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:40,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:47:40,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:42,505 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:42,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:42,889 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:42,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [31556242] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:42,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925693153] [2021-11-23 16:47:42,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:42,890 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:42,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:42,897 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:42,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 16:47:42,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:43,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:47:43,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:44,283 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:44,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:44,787 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:44,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925693153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:44,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:44,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 10, 9] total 42 [2021-11-23 16:47:44,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835641548] [2021-11-23 16:47:44,787 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:44,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 16:47:44,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:44,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 16:47:44,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1493, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 16:47:44,789 INFO L87 Difference]: Start difference. First operand 1098 states and 1393 transitions. Second operand has 42 states, 42 states have (on average 6.357142857142857) internal successors, (267), 42 states have internal predecessors, (267), 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 16:47:45,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:45,049 INFO L93 Difference]: Finished difference Result 1664 states and 2089 transitions. [2021-11-23 16:47:45,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:47:45,049 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 6.357142857142857) internal successors, (267), 42 states have internal predecessors, (267), 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 81 [2021-11-23 16:47:45,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:45,051 INFO L225 Difference]: With dead ends: 1664 [2021-11-23 16:47:45,051 INFO L226 Difference]: Without dead ends: 1258 [2021-11-23 16:47:45,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 438 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=247, Invalid=1559, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 16:47:45,052 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 161 mSDsluCounter, 1882 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 1994 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:45,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 1994 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 158 Invalid, 0 Unknown, 147 Unchecked, 0.1s Time] [2021-11-23 16:47:45,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1258 states. [2021-11-23 16:47:45,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1258 to 918. [2021-11-23 16:47:45,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 918 states, 917 states have (on average 1.2671755725190839) internal successors, (1162), 917 states have internal predecessors, (1162), 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 16:47:45,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1162 transitions. [2021-11-23 16:47:45,172 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1162 transitions. Word has length 81 [2021-11-23 16:47:45,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:45,173 INFO L470 AbstractCegarLoop]: Abstraction has 918 states and 1162 transitions. [2021-11-23 16:47:45,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 6.357142857142857) internal successors, (267), 42 states have internal predecessors, (267), 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 16:47:45,173 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1162 transitions. [2021-11-23 16:47:45,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:47:45,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:45,174 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:45,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:45,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-23 16:47:45,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Ended with exit code 0 [2021-11-23 16:47:45,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:45,785 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:45,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:45,786 INFO L85 PathProgramCache]: Analyzing trace with hash -895644954, now seen corresponding path program 1 times [2021-11-23 16:47:45,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:45,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [807291850] [2021-11-23 16:47:45,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:45,787 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:45,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:45,788 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:45,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 16:47:45,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:45,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:47:45,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:47,067 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:47,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:47,434 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:47,434 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:47,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [807291850] [2021-11-23 16:47:47,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [807291850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:47,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [467167298] [2021-11-23 16:47:47,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:47,435 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:47,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:47,436 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:47,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-23 16:47:47,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:47,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:47,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:48,793 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:48,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:48,965 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:48,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [467167298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:48,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024873474] [2021-11-23 16:47:48,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:48,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:48,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:48,966 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:48,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-23 16:47:49,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:49,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:47:49,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:50,290 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:50,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:50,938 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:50,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024873474] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:50,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:50,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 30 [2021-11-23 16:47:50,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755236728] [2021-11-23 16:47:50,940 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:50,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 16:47:50,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:50,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 16:47:50,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-23 16:47:50,942 INFO L87 Difference]: Start difference. First operand 918 states and 1162 transitions. Second operand has 30 states, 30 states have (on average 8.366666666666667) internal successors, (251), 30 states have internal predecessors, (251), 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 16:47:51,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:51,079 INFO L93 Difference]: Finished difference Result 1214 states and 1549 transitions. [2021-11-23 16:47:51,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:47:51,079 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 8.366666666666667) internal successors, (251), 30 states have internal predecessors, (251), 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 82 [2021-11-23 16:47:51,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:51,081 INFO L225 Difference]: With dead ends: 1214 [2021-11-23 16:47:51,081 INFO L226 Difference]: Without dead ends: 924 [2021-11-23 16:47:51,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 457 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2021-11-23 16:47:51,083 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 100 mSDsluCounter, 968 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 1055 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:51,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 1055 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 117 Unchecked, 0.0s Time] [2021-11-23 16:47:51,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 924 states. [2021-11-23 16:47:51,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 924 to 908. [2021-11-23 16:47:51,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 907 states have (on average 1.2679162072767365) internal successors, (1150), 907 states have internal predecessors, (1150), 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 16:47:51,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1150 transitions. [2021-11-23 16:47:51,201 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1150 transitions. Word has length 82 [2021-11-23 16:47:51,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:51,202 INFO L470 AbstractCegarLoop]: Abstraction has 908 states and 1150 transitions. [2021-11-23 16:47:51,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 8.366666666666667) internal successors, (251), 30 states have internal predecessors, (251), 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 16:47:51,202 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1150 transitions. [2021-11-23 16:47:51,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:47:51,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:51,203 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:51,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:51,428 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-23 16:47:51,613 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Ended with exit code 0 [2021-11-23 16:47:51,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:51,806 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:51,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:51,807 INFO L85 PathProgramCache]: Analyzing trace with hash 221268422, now seen corresponding path program 1 times [2021-11-23 16:47:51,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:51,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1456222174] [2021-11-23 16:47:51,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:51,807 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:51,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:51,808 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:51,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-23 16:47:51,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:51,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:47:51,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:52,977 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:52,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:53,270 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:53,270 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:53,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1456222174] [2021-11-23 16:47:53,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1456222174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:53,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1534436400] [2021-11-23 16:47:53,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:53,271 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:53,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:53,272 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:53,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-23 16:47:53,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:53,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:53,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:54,481 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:54,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:54,672 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:54,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1534436400] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:54,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230372933] [2021-11-23 16:47:54,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:54,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:54,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:54,676 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:54,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-23 16:47:54,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:54,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:47:54,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:57,139 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:57,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:57,997 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:57,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230372933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:57,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:57,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 16, 14] total 42 [2021-11-23 16:47:57,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584071510] [2021-11-23 16:47:57,998 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:57,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 16:47:57,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:57,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 16:47:58,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1517, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 16:47:58,000 INFO L87 Difference]: Start difference. First operand 908 states and 1150 transitions. Second operand has 42 states, 42 states have (on average 6.238095238095238) internal successors, (262), 42 states have internal predecessors, (262), 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 16:47:58,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:58,405 INFO L93 Difference]: Finished difference Result 1261 states and 1612 transitions. [2021-11-23 16:47:58,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 16:47:58,406 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 6.238095238095238) internal successors, (262), 42 states have internal predecessors, (262), 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 82 [2021-11-23 16:47:58,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:58,409 INFO L225 Difference]: With dead ends: 1261 [2021-11-23 16:47:58,409 INFO L226 Difference]: Without dead ends: 971 [2021-11-23 16:47:58,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:47:58,411 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 182 mSDsluCounter, 1234 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 1318 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:58,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 1318 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 162 Invalid, 0 Unknown, 117 Unchecked, 0.1s Time] [2021-11-23 16:47:58,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 971 states. [2021-11-23 16:47:58,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 971 to 920. [2021-11-23 16:47:58,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 920 states, 919 states have (on average 1.2665941240478782) internal successors, (1164), 919 states have internal predecessors, (1164), 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 16:47:58,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 920 states to 920 states and 1164 transitions. [2021-11-23 16:47:58,534 INFO L78 Accepts]: Start accepts. Automaton has 920 states and 1164 transitions. Word has length 82 [2021-11-23 16:47:58,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:58,536 INFO L470 AbstractCegarLoop]: Abstraction has 920 states and 1164 transitions. [2021-11-23 16:47:58,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 6.238095238095238) internal successors, (262), 42 states have internal predecessors, (262), 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 16:47:58,536 INFO L276 IsEmpty]: Start isEmpty. Operand 920 states and 1164 transitions. [2021-11-23 16:47:58,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:47:58,537 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:58,537 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:58,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:58,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:58,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:59,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:59,149 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:59,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:59,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1409212898, now seen corresponding path program 1 times [2021-11-23 16:47:59,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:59,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [383282459] [2021-11-23 16:47:59,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:59,150 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:59,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:59,151 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:59,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 16:47:59,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:59,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:59,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:59,470 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:59,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:59,640 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:59,641 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:59,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [383282459] [2021-11-23 16:47:59,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [383282459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:59,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [580334077] [2021-11-23 16:47:59,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:59,642 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:59,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:59,656 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:59,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-23 16:47:59,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:59,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:59,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:59,874 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:47:59,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:59,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [580334077] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:59,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:47:59,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 16:47:59,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550351112] [2021-11-23 16:47:59,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:59,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:59,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:59,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:59,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:59,879 INFO L87 Difference]: Start difference. First operand 920 states and 1164 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 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 16:48:00,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:00,010 INFO L93 Difference]: Finished difference Result 1691 states and 2156 transitions. [2021-11-23 16:48:00,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:48:00,010 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 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 82 [2021-11-23 16:48:00,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:00,011 INFO L225 Difference]: With dead ends: 1691 [2021-11-23 16:48:00,012 INFO L226 Difference]: Without dead ends: 937 [2021-11-23 16:48:00,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 238 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 16:48:00,013 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 60 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:00,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 167 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:48:00,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 937 states. [2021-11-23 16:48:00,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 937 to 882. [2021-11-23 16:48:00,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 882 states, 881 states have (on average 1.2656072644721907) internal successors, (1115), 881 states have internal predecessors, (1115), 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 16:48:00,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 882 states to 882 states and 1115 transitions. [2021-11-23 16:48:00,092 INFO L78 Accepts]: Start accepts. Automaton has 882 states and 1115 transitions. Word has length 82 [2021-11-23 16:48:00,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:00,092 INFO L470 AbstractCegarLoop]: Abstraction has 882 states and 1115 transitions. [2021-11-23 16:48:00,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 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 16:48:00,093 INFO L276 IsEmpty]: Start isEmpty. Operand 882 states and 1115 transitions. [2021-11-23 16:48:00,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 16:48:00,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:00,093 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:00,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 0 [2021-11-23 16:48:00,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:00,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:00,496 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:00,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:00,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1933984338, now seen corresponding path program 1 times [2021-11-23 16:48:00,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:00,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [878204331] [2021-11-23 16:48:00,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:00,497 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:00,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:00,498 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:00,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 16:48:00,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:00,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:48:00,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:02,453 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:02,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:03,171 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:03,172 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:03,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [878204331] [2021-11-23 16:48:03,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [878204331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:03,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [343838951] [2021-11-23 16:48:03,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:03,172 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:03,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:03,173 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:03,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 16:48:03,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:03,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:48:03,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:06,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:07,967 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:07,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [343838951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:07,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764757652] [2021-11-23 16:48:07,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:07,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:07,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:07,968 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:07,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 16:48:08,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:08,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:48:08,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:09,430 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:09,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:09,888 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:09,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764757652] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:09,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:09,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 19, 15, 10, 9] total 67 [2021-11-23 16:48:09,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206309397] [2021-11-23 16:48:09,889 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:09,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-23 16:48:09,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:09,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-23 16:48:09,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=3957, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 16:48:09,891 INFO L87 Difference]: Start difference. First operand 882 states and 1115 transitions. Second operand has 67 states, 67 states have (on average 5.492537313432836) internal successors, (368), 67 states have internal predecessors, (368), 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 16:48:11,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:11,677 INFO L93 Difference]: Finished difference Result 1465 states and 1822 transitions. [2021-11-23 16:48:11,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 16:48:11,678 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 5.492537313432836) internal successors, (368), 67 states have internal predecessors, (368), 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 83 [2021-11-23 16:48:11,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:11,680 INFO L225 Difference]: With dead ends: 1465 [2021-11-23 16:48:11,680 INFO L226 Difference]: Without dead ends: 1179 [2021-11-23 16:48:11,681 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 432 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2389 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=786, Invalid=6186, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 16:48:11,681 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 214 mSDsluCounter, 2842 mSDsCounter, 0 mSdLazyCounter, 524 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 2963 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 524 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 201 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:11,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 2963 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 524 Invalid, 0 Unknown, 201 Unchecked, 0.4s Time] [2021-11-23 16:48:11,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1179 states. [2021-11-23 16:48:11,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1179 to 798. [2021-11-23 16:48:11,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 797 states have (on average 1.2622333751568382) internal successors, (1006), 797 states have internal predecessors, (1006), 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 16:48:11,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 1006 transitions. [2021-11-23 16:48:11,795 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 1006 transitions. Word has length 83 [2021-11-23 16:48:11,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:11,796 INFO L470 AbstractCegarLoop]: Abstraction has 798 states and 1006 transitions. [2021-11-23 16:48:11,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 5.492537313432836) internal successors, (368), 67 states have internal predecessors, (368), 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 16:48:11,796 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 1006 transitions. [2021-11-23 16:48:11,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:11,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:11,797 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:11,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:12,010 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Ended with exit code 0 [2021-11-23 16:48:12,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 16:48:12,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:12,409 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:12,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:12,409 INFO L85 PathProgramCache]: Analyzing trace with hash -323517319, now seen corresponding path program 1 times [2021-11-23 16:48:12,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:12,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [733967651] [2021-11-23 16:48:12,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:12,410 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:12,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:12,411 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:12,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 16:48:12,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:12,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:12,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:13,626 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:48:13,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:14,166 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:48:14,166 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:14,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [733967651] [2021-11-23 16:48:14,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [733967651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:14,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [451195560] [2021-11-23 16:48:14,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:14,167 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:14,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:14,175 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:14,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 16:48:14,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:14,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:14,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:15,369 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:48:15,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:15,784 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:48:15,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [451195560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:15,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924148559] [2021-11-23 16:48:15,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:15,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:15,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:15,786 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:15,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 16:48:15,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:15,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:48:15,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:16,403 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:16,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:16,919 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:16,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924148559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:16,920 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:16,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 16:48:16,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084608849] [2021-11-23 16:48:16,920 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:16,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:48:16,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:16,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:48:16,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:48:16,922 INFO L87 Difference]: Start difference. First operand 798 states and 1006 transitions. Second operand has 22 states, 22 states have (on average 15.681818181818182) internal successors, (345), 21 states have internal predecessors, (345), 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 16:48:17,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:17,284 INFO L93 Difference]: Finished difference Result 1537 states and 1952 transitions. [2021-11-23 16:48:17,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:48:17,285 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 15.681818181818182) internal successors, (345), 21 states have internal predecessors, (345), 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 132 [2021-11-23 16:48:17,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:17,288 INFO L225 Difference]: With dead ends: 1537 [2021-11-23 16:48:17,288 INFO L226 Difference]: Without dead ends: 827 [2021-11-23 16:48:17,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 768 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:48:17,291 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 114 mSDsluCounter, 778 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 856 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 97 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:17,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 856 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 86 Invalid, 0 Unknown, 97 Unchecked, 0.0s Time] [2021-11-23 16:48:17,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 827 states. [2021-11-23 16:48:17,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 827 to 827. [2021-11-23 16:48:17,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 826 states have (on average 1.2566585956416465) internal successors, (1038), 826 states have internal predecessors, (1038), 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 16:48:17,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1038 transitions. [2021-11-23 16:48:17,412 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1038 transitions. Word has length 132 [2021-11-23 16:48:17,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:17,412 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1038 transitions. [2021-11-23 16:48:17,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 15.681818181818182) internal successors, (345), 21 states have internal predecessors, (345), 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 16:48:17,413 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1038 transitions. [2021-11-23 16:48:17,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:17,414 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:17,414 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:17,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:17,636 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Ended with exit code 0 [2021-11-23 16:48:17,831 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 16:48:18,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:18,030 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:18,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:18,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1925987042, now seen corresponding path program 1 times [2021-11-23 16:48:18,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:18,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2097181570] [2021-11-23 16:48:18,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:18,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:18,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:18,032 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:18,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 16:48:18,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:18,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:18,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,455 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 66 proven. 27 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:19,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:19,813 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 66 proven. 27 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:19,813 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:19,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2097181570] [2021-11-23 16:48:19,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2097181570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:19,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1825540411] [2021-11-23 16:48:19,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:19,814 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:19,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:19,814 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 16:48:20,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:20,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:20,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:21,250 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 66 proven. 27 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:21,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:21,521 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 66 proven. 27 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:21,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1825540411] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:21,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330640155] [2021-11-23 16:48:21,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:21,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:21,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:21,522 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:21,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 16:48:21,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:21,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:48:21,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:22,152 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 66 proven. 23 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:22,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:22,734 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 66 proven. 23 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:22,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330640155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:22,734 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:22,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 16:48:22,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284382653] [2021-11-23 16:48:22,735 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:22,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:48:22,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:22,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:48:22,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:48:22,737 INFO L87 Difference]: Start difference. First operand 827 states and 1038 transitions. Second operand has 22 states, 22 states have (on average 16.318181818181817) internal successors, (359), 21 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 16:48:23,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:23,129 INFO L93 Difference]: Finished difference Result 1582 states and 2001 transitions. [2021-11-23 16:48:23,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:48:23,129 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 16.318181818181817) internal successors, (359), 21 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 132 [2021-11-23 16:48:23,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:23,131 INFO L225 Difference]: With dead ends: 1582 [2021-11-23 16:48:23,131 INFO L226 Difference]: Without dead ends: 878 [2021-11-23 16:48:23,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 800 GetRequests, 770 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:48:23,133 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 80 mSDsluCounter, 706 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 785 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:23,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 785 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 0 Unknown, 106 Unchecked, 0.0s Time] [2021-11-23 16:48:23,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 878 states. [2021-11-23 16:48:23,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 878 to 878. [2021-11-23 16:48:23,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 878 states, 877 states have (on average 1.2474344355758267) internal successors, (1094), 877 states have internal predecessors, (1094), 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 16:48:23,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 878 states to 878 states and 1094 transitions. [2021-11-23 16:48:23,266 INFO L78 Accepts]: Start accepts. Automaton has 878 states and 1094 transitions. Word has length 132 [2021-11-23 16:48:23,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:23,267 INFO L470 AbstractCegarLoop]: Abstraction has 878 states and 1094 transitions. [2021-11-23 16:48:23,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 16.318181818181817) internal successors, (359), 21 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 16:48:23,267 INFO L276 IsEmpty]: Start isEmpty. Operand 878 states and 1094 transitions. [2021-11-23 16:48:23,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:23,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:23,269 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:48:23,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:23,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Ended with exit code 0 [2021-11-23 16:48:23,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2021-11-23 16:48:23,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:23,871 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:23,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:23,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1455485273, now seen corresponding path program 1 times [2021-11-23 16:48:23,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:23,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1104401539] [2021-11-23 16:48:23,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:23,872 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:23,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:23,875 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:23,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 16:48:23,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:23,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:23,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:25,277 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 62 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:48:25,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:25,691 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 62 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:48:25,691 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:25,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1104401539] [2021-11-23 16:48:25,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1104401539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:25,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [586225239] [2021-11-23 16:48:25,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:25,691 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:25,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:25,692 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:25,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 16:48:25,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:25,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:25,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:27,140 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 62 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:48:27,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 62 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:48:27,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [586225239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:27,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979004948] [2021-11-23 16:48:27,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:27,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:27,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:27,472 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:27,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 16:48:27,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:27,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:48:27,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:28,128 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 62 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:28,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:28,778 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 62 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:28,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979004948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:28,778 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:28,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 16:48:28,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917195850] [2021-11-23 16:48:28,779 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:28,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:48:28,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:28,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:48:28,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:48:28,781 INFO L87 Difference]: Start difference. First operand 878 states and 1094 transitions. Second operand has 22 states, 22 states have (on average 16.772727272727273) internal successors, (369), 21 states have internal predecessors, (369), 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 16:48:29,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:29,126 INFO L93 Difference]: Finished difference Result 1659 states and 2084 transitions. [2021-11-23 16:48:29,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:48:29,127 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 16.772727272727273) internal successors, (369), 21 states have internal predecessors, (369), 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 132 [2021-11-23 16:48:29,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:29,128 INFO L225 Difference]: With dead ends: 1659 [2021-11-23 16:48:29,128 INFO L226 Difference]: Without dead ends: 961 [2021-11-23 16:48:29,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 800 GetRequests, 770 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=184, Invalid=808, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:48:29,130 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 131 mSDsluCounter, 792 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:29,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 873 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 19 Invalid, 0 Unknown, 91 Unchecked, 0.0s Time] [2021-11-23 16:48:29,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2021-11-23 16:48:29,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 961. [2021-11-23 16:48:29,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 961 states, 960 states have (on average 1.2333333333333334) internal successors, (1184), 960 states have internal predecessors, (1184), 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 16:48:29,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 961 states to 961 states and 1184 transitions. [2021-11-23 16:48:29,224 INFO L78 Accepts]: Start accepts. Automaton has 961 states and 1184 transitions. Word has length 132 [2021-11-23 16:48:29,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:29,224 INFO L470 AbstractCegarLoop]: Abstraction has 961 states and 1184 transitions. [2021-11-23 16:48:29,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 16.772727272727273) internal successors, (369), 21 states have internal predecessors, (369), 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 16:48:29,224 INFO L276 IsEmpty]: Start isEmpty. Operand 961 states and 1184 transitions. [2021-11-23 16:48:29,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:29,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:29,226 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:48:29,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:29,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Ended with exit code 0 [2021-11-23 16:48:29,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Ended with exit code 0 [2021-11-23 16:48:29,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:29,842 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:29,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:29,842 INFO L85 PathProgramCache]: Analyzing trace with hash -495858626, now seen corresponding path program 1 times [2021-11-23 16:48:29,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:29,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [491168660] [2021-11-23 16:48:29,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:29,843 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:29,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:29,843 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:29,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 16:48:29,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:29,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:29,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:31,708 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:31,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:32,366 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:32,366 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:32,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [491168660] [2021-11-23 16:48:32,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [491168660] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:32,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1897821852] [2021-11-23 16:48:32,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:32,366 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:32,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:32,367 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:32,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 16:48:32,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:32,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:32,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:34,042 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:34,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:34,485 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:34,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1897821852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:34,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658182760] [2021-11-23 16:48:34,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:34,485 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:34,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:34,486 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:34,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 16:48:34,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:34,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:34,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:36,343 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 71 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:36,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:36,906 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 30 proven. 71 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:36,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658182760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:36,906 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:36,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:48:36,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932161631] [2021-11-23 16:48:36,906 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:36,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:48:36,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:36,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:48:36,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:48:36,908 INFO L87 Difference]: Start difference. First operand 961 states and 1184 transitions. Second operand has 34 states, 34 states have (on average 12.235294117647058) internal successors, (416), 33 states have internal predecessors, (416), 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 16:48:37,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:37,512 INFO L93 Difference]: Finished difference Result 1664 states and 2078 transitions. [2021-11-23 16:48:37,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:48:37,512 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.235294117647058) internal successors, (416), 33 states have internal predecessors, (416), 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 132 [2021-11-23 16:48:37,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:37,514 INFO L225 Difference]: With dead ends: 1664 [2021-11-23 16:48:37,514 INFO L226 Difference]: Without dead ends: 1020 [2021-11-23 16:48:37,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 756 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 16:48:37,515 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 227 mSDsluCounter, 1424 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 1518 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 210 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:37,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 1518 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 0 Unknown, 210 Unchecked, 0.1s Time] [2021-11-23 16:48:37,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1020 states. [2021-11-23 16:48:37,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1020 to 1020. [2021-11-23 16:48:37,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1020 states, 1019 states have (on average 1.2266928361138372) internal successors, (1250), 1019 states have internal predecessors, (1250), 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 16:48:37,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1020 states to 1020 states and 1250 transitions. [2021-11-23 16:48:37,622 INFO L78 Accepts]: Start accepts. Automaton has 1020 states and 1250 transitions. Word has length 132 [2021-11-23 16:48:37,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:37,623 INFO L470 AbstractCegarLoop]: Abstraction has 1020 states and 1250 transitions. [2021-11-23 16:48:37,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.235294117647058) internal successors, (416), 33 states have internal predecessors, (416), 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 16:48:37,623 INFO L276 IsEmpty]: Start isEmpty. Operand 1020 states and 1250 transitions. [2021-11-23 16:48:37,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:37,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:37,625 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:48:37,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:37,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2021-11-23 16:48:38,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:38,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:38,227 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:38,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:38,227 INFO L85 PathProgramCache]: Analyzing trace with hash -199813198, now seen corresponding path program 1 times [2021-11-23 16:48:38,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:38,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1481656304] [2021-11-23 16:48:38,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:38,228 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:38,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:38,229 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:38,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-23 16:48:38,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:38,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:38,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:40,500 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:40,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:40,966 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:40,966 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:40,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1481656304] [2021-11-23 16:48:40,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1481656304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:40,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1119664280] [2021-11-23 16:48:40,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:40,967 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:40,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:40,968 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:40,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-23 16:48:41,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:41,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:41,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:43,012 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:43,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:43,321 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:43,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1119664280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:43,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539040633] [2021-11-23 16:48:43,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:43,321 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:43,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:43,322 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:43,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 16:48:43,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:43,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:43,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:45,146 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:48:45,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:45,743 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:48:45,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539040633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:45,744 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:45,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:48:45,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444648427] [2021-11-23 16:48:45,744 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:45,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:48:45,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:45,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:48:45,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:48:45,745 INFO L87 Difference]: Start difference. First operand 1020 states and 1250 transitions. Second operand has 34 states, 34 states have (on average 12.676470588235293) internal successors, (431), 33 states have internal predecessors, (431), 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 16:48:46,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:46,288 INFO L93 Difference]: Finished difference Result 1820 states and 2264 transitions. [2021-11-23 16:48:46,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 16:48:46,289 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.676470588235293) internal successors, (431), 33 states have internal predecessors, (431), 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 132 [2021-11-23 16:48:46,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:46,290 INFO L225 Difference]: With dead ends: 1820 [2021-11-23 16:48:46,290 INFO L226 Difference]: Without dead ends: 1188 [2021-11-23 16:48:46,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 801 GetRequests, 759 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:48:46,292 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 164 mSDsluCounter, 1659 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 1754 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 196 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:46,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 1754 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 81 Invalid, 0 Unknown, 196 Unchecked, 0.1s Time] [2021-11-23 16:48:46,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1188 states. [2021-11-23 16:48:46,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1188 to 1116. [2021-11-23 16:48:46,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1116 states, 1115 states have (on average 1.22152466367713) internal successors, (1362), 1115 states have internal predecessors, (1362), 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 16:48:46,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1116 states to 1116 states and 1362 transitions. [2021-11-23 16:48:46,411 INFO L78 Accepts]: Start accepts. Automaton has 1116 states and 1362 transitions. Word has length 132 [2021-11-23 16:48:46,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:46,411 INFO L470 AbstractCegarLoop]: Abstraction has 1116 states and 1362 transitions. [2021-11-23 16:48:46,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.676470588235293) internal successors, (431), 33 states have internal predecessors, (431), 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 16:48:46,412 INFO L276 IsEmpty]: Start isEmpty. Operand 1116 states and 1362 transitions. [2021-11-23 16:48:46,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:46,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:46,413 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:48:46,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:46,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:46,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:47,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:47,014 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:47,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:47,014 INFO L85 PathProgramCache]: Analyzing trace with hash -2130858789, now seen corresponding path program 1 times [2021-11-23 16:48:47,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:47,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1882042551] [2021-11-23 16:48:47,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:47,015 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:47,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:47,016 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:47,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 16:48:47,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:47,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:47,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:48,885 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 44 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:48,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:49,512 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 44 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:49,513 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:49,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1882042551] [2021-11-23 16:48:49,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1882042551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:49,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [707352513] [2021-11-23 16:48:49,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:49,513 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:49,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:49,514 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:49,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-23 16:48:49,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:49,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:49,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:51,146 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 44 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:51,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:51,540 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 44 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:51,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [707352513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:51,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159056079] [2021-11-23 16:48:51,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:51,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:51,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:51,543 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:51,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 16:48:51,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:51,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:51,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:52,947 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 44 proven. 56 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:52,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:53,646 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 44 proven. 56 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:53,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159056079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:53,646 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:53,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:48:53,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745922845] [2021-11-23 16:48:53,647 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:53,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:48:53,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:53,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:48:53,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:48:53,649 INFO L87 Difference]: Start difference. First operand 1116 states and 1362 transitions. Second operand has 34 states, 34 states have (on average 11.911764705882353) internal successors, (405), 33 states have internal predecessors, (405), 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 16:48:54,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:54,231 INFO L93 Difference]: Finished difference Result 2082 states and 2543 transitions. [2021-11-23 16:48:54,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 16:48:54,232 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 11.911764705882353) internal successors, (405), 33 states have internal predecessors, (405), 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 132 [2021-11-23 16:48:54,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:54,254 INFO L225 Difference]: With dead ends: 2082 [2021-11-23 16:48:54,255 INFO L226 Difference]: Without dead ends: 1432 [2021-11-23 16:48:54,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 757 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=256, Invalid=1636, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:48:54,257 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 190 mSDsluCounter, 1562 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 1652 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:54,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 1652 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 93 Invalid, 0 Unknown, 209 Unchecked, 0.1s Time] [2021-11-23 16:48:54,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1432 states. [2021-11-23 16:48:54,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1432 to 1366. [2021-11-23 16:48:54,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1366 states, 1365 states have (on average 1.1941391941391941) internal successors, (1630), 1365 states have internal predecessors, (1630), 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 16:48:54,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1366 states to 1366 states and 1630 transitions. [2021-11-23 16:48:54,439 INFO L78 Accepts]: Start accepts. Automaton has 1366 states and 1630 transitions. Word has length 132 [2021-11-23 16:48:54,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:54,440 INFO L470 AbstractCegarLoop]: Abstraction has 1366 states and 1630 transitions. [2021-11-23 16:48:54,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 11.911764705882353) internal successors, (405), 33 states have internal predecessors, (405), 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 16:48:54,440 INFO L276 IsEmpty]: Start isEmpty. Operand 1366 states and 1630 transitions. [2021-11-23 16:48:54,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:48:54,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:54,442 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:48:54,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Ended with exit code 0 [2021-11-23 16:48:54,656 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Ended with exit code 0 [2021-11-23 16:48:54,875 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2021-11-23 16:48:55,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:55,055 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:55,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:55,055 INFO L85 PathProgramCache]: Analyzing trace with hash -1132420541, now seen corresponding path program 1 times [2021-11-23 16:48:55,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:55,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1129866498] [2021-11-23 16:48:55,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:55,056 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:55,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:55,056 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:55,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 16:48:55,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:55,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:55,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:56,478 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:48:56,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:56,940 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:48:56,940 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:56,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1129866498] [2021-11-23 16:48:56,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1129866498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:56,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [379984316] [2021-11-23 16:48:56,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:56,941 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:56,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:56,942 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:56,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-23 16:48:57,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:57,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:57,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:58,405 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:48:58,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:58,776 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:48:58,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [379984316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:58,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241340919] [2021-11-23 16:48:58,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:58,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:58,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:58,777 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:58,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 16:48:58,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:58,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:48:58,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:59,419 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 33 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:59,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:00,098 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 33 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:49:00,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241340919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:00,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:00,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 16:49:00,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509252392] [2021-11-23 16:49:00,099 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:00,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:49:00,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:00,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:49:00,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:49:00,100 INFO L87 Difference]: Start difference. First operand 1366 states and 1630 transitions. Second operand has 22 states, 22 states have (on average 17.227272727272727) internal successors, (379), 21 states have internal predecessors, (379), 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 16:49:00,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:00,491 INFO L93 Difference]: Finished difference Result 2096 states and 2568 transitions. [2021-11-23 16:49:00,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 16:49:00,492 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 17.227272727272727) internal successors, (379), 21 states have internal predecessors, (379), 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 132 [2021-11-23 16:49:00,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:00,494 INFO L225 Difference]: With dead ends: 2096 [2021-11-23 16:49:00,494 INFO L226 Difference]: Without dead ends: 1404 [2021-11-23 16:49:00,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 769 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=181, Invalid=811, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:49:00,495 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 78 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 915 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:00,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 915 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 114 Unchecked, 0.0s Time] [2021-11-23 16:49:00,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1404 states. [2021-11-23 16:49:00,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1404 to 1384. [2021-11-23 16:49:00,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1384 states, 1383 states have (on average 1.1916124367317427) internal successors, (1648), 1383 states have internal predecessors, (1648), 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 16:49:00,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1384 states to 1384 states and 1648 transitions. [2021-11-23 16:49:00,646 INFO L78 Accepts]: Start accepts. Automaton has 1384 states and 1648 transitions. Word has length 132 [2021-11-23 16:49:00,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:00,647 INFO L470 AbstractCegarLoop]: Abstraction has 1384 states and 1648 transitions. [2021-11-23 16:49:00,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 17.227272727272727) internal successors, (379), 21 states have internal predecessors, (379), 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 16:49:00,647 INFO L276 IsEmpty]: Start isEmpty. Operand 1384 states and 1648 transitions. [2021-11-23 16:49:00,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:00,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:00,649 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:00,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:00,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:01,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:01,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:01,252 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:01,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:01,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1282485857, now seen corresponding path program 1 times [2021-11-23 16:49:01,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:01,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [641817198] [2021-11-23 16:49:01,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:01,253 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:01,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:01,254 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:01,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 16:49:01,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:01,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:49:01,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:01,981 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:49:01,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:01,982 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:01,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [641817198] [2021-11-23 16:49:01,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [641817198] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:01,982 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:01,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:01,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876352874] [2021-11-23 16:49:01,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:01,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:49:01,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:01,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:49:01,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:01,983 INFO L87 Difference]: Start difference. First operand 1384 states and 1648 transitions. Second operand has 5 states, 5 states have (on average 23.0) internal successors, (115), 4 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 16:49:02,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:02,212 INFO L93 Difference]: Finished difference Result 2832 states and 3511 transitions. [2021-11-23 16:49:02,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:49:02,212 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 23.0) internal successors, (115), 4 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 133 [2021-11-23 16:49:02,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:02,216 INFO L225 Difference]: With dead ends: 2832 [2021-11-23 16:49:02,216 INFO L226 Difference]: Without dead ends: 2122 [2021-11-23 16:49:02,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:49:02,218 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 95 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:02,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 201 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 39 Unchecked, 0.0s Time] [2021-11-23 16:49:02,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2122 states. [2021-11-23 16:49:02,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2122 to 2104. [2021-11-23 16:49:02,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2104 states, 2103 states have (on average 1.2177841179267712) internal successors, (2561), 2103 states have internal predecessors, (2561), 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 16:49:02,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2104 states to 2104 states and 2561 transitions. [2021-11-23 16:49:02,514 INFO L78 Accepts]: Start accepts. Automaton has 2104 states and 2561 transitions. Word has length 133 [2021-11-23 16:49:02,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:02,514 INFO L470 AbstractCegarLoop]: Abstraction has 2104 states and 2561 transitions. [2021-11-23 16:49:02,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 23.0) internal successors, (115), 4 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 16:49:02,515 INFO L276 IsEmpty]: Start isEmpty. Operand 2104 states and 2561 transitions. [2021-11-23 16:49:02,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:02,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:02,527 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:49:02,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:02,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:02,727 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:02,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:02,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1110144550, now seen corresponding path program 1 times [2021-11-23 16:49:02,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:02,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [868666556] [2021-11-23 16:49:02,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:02,728 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:02,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:02,729 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:02,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 16:49:02,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:02,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:02,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:04,108 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 30 proven. 53 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:04,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:04,477 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 30 proven. 53 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:04,477 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:04,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [868666556] [2021-11-23 16:49:04,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [868666556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:04,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1636500352] [2021-11-23 16:49:04,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:04,481 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:04,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:04,482 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:04,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2021-11-23 16:49:04,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:04,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:04,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:05,803 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 30 proven. 53 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:05,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:06,102 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 30 proven. 53 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:06,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1636500352] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:06,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599242207] [2021-11-23 16:49:06,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:06,102 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:06,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:06,109 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:06,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 16:49:06,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:06,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:06,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:07,382 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 30 proven. 53 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:07,688 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 30 proven. 53 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599242207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:07,689 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:07,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:49:07,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969717418] [2021-11-23 16:49:07,689 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:07,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:49:07,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:07,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:49:07,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:49:07,690 INFO L87 Difference]: Start difference. First operand 2104 states and 2561 transitions. Second operand has 16 states, 16 states have (on average 13.875) internal successors, (222), 15 states have internal predecessors, (222), 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 16:49:08,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:08,221 INFO L93 Difference]: Finished difference Result 3868 states and 4800 transitions. [2021-11-23 16:49:08,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 16:49:08,222 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 13.875) internal successors, (222), 15 states have internal predecessors, (222), 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 133 [2021-11-23 16:49:08,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:08,225 INFO L225 Difference]: With dead ends: 3868 [2021-11-23 16:49:08,225 INFO L226 Difference]: Without dead ends: 3224 [2021-11-23 16:49:08,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 802 GetRequests, 780 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:49:08,228 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 206 mSDsluCounter, 905 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 1022 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 197 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:08,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 1022 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 104 Invalid, 0 Unknown, 197 Unchecked, 0.1s Time] [2021-11-23 16:49:08,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3224 states. [2021-11-23 16:49:08,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3224 to 3200. [2021-11-23 16:49:08,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3200 states, 3199 states have (on average 1.2266333229134105) internal successors, (3924), 3199 states have internal predecessors, (3924), 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 16:49:08,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3200 states to 3200 states and 3924 transitions. [2021-11-23 16:49:08,565 INFO L78 Accepts]: Start accepts. Automaton has 3200 states and 3924 transitions. Word has length 133 [2021-11-23 16:49:08,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:08,565 INFO L470 AbstractCegarLoop]: Abstraction has 3200 states and 3924 transitions. [2021-11-23 16:49:08,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 13.875) internal successors, (222), 15 states have internal predecessors, (222), 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 16:49:08,565 INFO L276 IsEmpty]: Start isEmpty. Operand 3200 states and 3924 transitions. [2021-11-23 16:49:08,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:08,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:08,569 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:08,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Ended with exit code 0 [2021-11-23 16:49:08,812 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2021-11-23 16:49:08,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Ended with exit code 0 [2021-11-23 16:49:09,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:09,180 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:09,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:09,181 INFO L85 PathProgramCache]: Analyzing trace with hash -120519066, now seen corresponding path program 1 times [2021-11-23 16:49:09,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:09,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [379295517] [2021-11-23 16:49:09,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:09,181 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:09,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:09,182 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:09,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 16:49:09,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:09,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:49:09,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:09,922 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:49:09,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:09,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:09,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [379295517] [2021-11-23 16:49:09,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [379295517] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:09,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:09,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:09,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327162947] [2021-11-23 16:49:09,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:09,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:49:09,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:09,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:49:09,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:09,924 INFO L87 Difference]: Start difference. First operand 3200 states and 3924 transitions. Second operand has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 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 16:49:10,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:10,544 INFO L93 Difference]: Finished difference Result 7767 states and 9665 transitions. [2021-11-23 16:49:10,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:49:10,545 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 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 133 [2021-11-23 16:49:10,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:10,552 INFO L225 Difference]: With dead ends: 7767 [2021-11-23 16:49:10,552 INFO L226 Difference]: Without dead ends: 5804 [2021-11-23 16:49:10,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:49:10,556 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 67 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:10,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 273 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 59 Unchecked, 0.0s Time] [2021-11-23 16:49:10,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5804 states. [2021-11-23 16:49:11,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5804 to 5742. [2021-11-23 16:49:11,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5742 states, 5741 states have (on average 1.233582999477443) internal successors, (7082), 5741 states have internal predecessors, (7082), 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 16:49:11,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5742 states to 5742 states and 7082 transitions. [2021-11-23 16:49:11,242 INFO L78 Accepts]: Start accepts. Automaton has 5742 states and 7082 transitions. Word has length 133 [2021-11-23 16:49:11,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:11,242 INFO L470 AbstractCegarLoop]: Abstraction has 5742 states and 7082 transitions. [2021-11-23 16:49:11,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 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 16:49:11,242 INFO L276 IsEmpty]: Start isEmpty. Operand 5742 states and 7082 transitions. [2021-11-23 16:49:11,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:11,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:11,246 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:49:11,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:11,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:11,458 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:11,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:11,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1648275530, now seen corresponding path program 1 times [2021-11-23 16:49:11,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:11,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1516793056] [2021-11-23 16:49:11,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:11,460 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:11,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:11,461 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:11,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 16:49:11,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:11,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:11,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:12,496 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 16:49:12,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:13,022 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 16:49:13,023 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:13,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1516793056] [2021-11-23 16:49:13,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1516793056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:13,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2130603921] [2021-11-23 16:49:13,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:13,023 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:13,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:13,026 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:13,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 16:49:13,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:13,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:13,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:14,066 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 16:49:14,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:14,548 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 16:49:14,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2130603921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:14,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349725679] [2021-11-23 16:49:14,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:14,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:14,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:14,549 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:14,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 16:49:14,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:14,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:14,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:15,448 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 16:49:15,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:15,900 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 16:49:15,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349725679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:15,900 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:15,900 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:49:15,901 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25085131] [2021-11-23 16:49:15,901 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:15,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:49:15,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:15,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:49:15,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:49:15,902 INFO L87 Difference]: Start difference. First operand 5742 states and 7082 transitions. Second operand has 16 states, 16 states have (on average 11.625) internal successors, (186), 15 states have internal predecessors, (186), 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 16:49:17,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:17,025 INFO L93 Difference]: Finished difference Result 9846 states and 12303 transitions. [2021-11-23 16:49:17,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:49:17,026 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.625) internal successors, (186), 15 states have internal predecessors, (186), 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 133 [2021-11-23 16:49:17,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:17,035 INFO L225 Difference]: With dead ends: 9846 [2021-11-23 16:49:17,035 INFO L226 Difference]: Without dead ends: 8560 [2021-11-23 16:49:17,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 801 GetRequests, 779 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:49:17,038 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 166 mSDsluCounter, 649 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 745 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:17,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 745 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 76 Unchecked, 0.0s Time] [2021-11-23 16:49:17,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8560 states. [2021-11-23 16:49:18,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8560 to 8468. [2021-11-23 16:49:18,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8468 states, 8467 states have (on average 1.2443604582496752) internal successors, (10536), 8467 states have internal predecessors, (10536), 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 16:49:18,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8468 states to 8468 states and 10536 transitions. [2021-11-23 16:49:18,096 INFO L78 Accepts]: Start accepts. Automaton has 8468 states and 10536 transitions. Word has length 133 [2021-11-23 16:49:18,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:18,096 INFO L470 AbstractCegarLoop]: Abstraction has 8468 states and 10536 transitions. [2021-11-23 16:49:18,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.625) internal successors, (186), 15 states have internal predecessors, (186), 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 16:49:18,097 INFO L276 IsEmpty]: Start isEmpty. Operand 8468 states and 10536 transitions. [2021-11-23 16:49:18,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:18,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:18,102 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:49:18,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-23 16:49:18,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:18,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:18,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:18,705 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:18,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:18,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1648253518, now seen corresponding path program 1 times [2021-11-23 16:49:18,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:18,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1220192806] [2021-11-23 16:49:18,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:18,706 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:18,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:18,707 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:18,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 16:49:18,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:18,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:49:18,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:19,465 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:49:19,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:19,466 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:19,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1220192806] [2021-11-23 16:49:19,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1220192806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:19,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:19,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:19,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787230276] [2021-11-23 16:49:19,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:19,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:49:19,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:19,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:49:19,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:19,467 INFO L87 Difference]: Start difference. First operand 8468 states and 10536 transitions. Second operand has 5 states, 5 states have (on average 20.6) internal successors, (103), 4 states have internal predecessors, (103), 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 16:49:20,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:20,904 INFO L93 Difference]: Finished difference Result 15537 states and 19434 transitions. [2021-11-23 16:49:20,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:49:20,904 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 4 states have internal predecessors, (103), 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 133 [2021-11-23 16:49:20,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:20,916 INFO L225 Difference]: With dead ends: 15537 [2021-11-23 16:49:20,917 INFO L226 Difference]: Without dead ends: 12031 [2021-11-23 16:49:20,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:49:20,921 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 65 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:20,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 255 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 55 Unchecked, 0.0s Time] [2021-11-23 16:49:20,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12031 states. [2021-11-23 16:49:22,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12031 to 11897. [2021-11-23 16:49:22,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11897 states, 11896 states have (on average 1.2397444519166105) internal successors, (14748), 11896 states have internal predecessors, (14748), 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 16:49:22,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11897 states to 11897 states and 14748 transitions. [2021-11-23 16:49:22,342 INFO L78 Accepts]: Start accepts. Automaton has 11897 states and 14748 transitions. Word has length 133 [2021-11-23 16:49:22,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:22,342 INFO L470 AbstractCegarLoop]: Abstraction has 11897 states and 14748 transitions. [2021-11-23 16:49:22,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 4 states have internal predecessors, (103), 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 16:49:22,343 INFO L276 IsEmpty]: Start isEmpty. Operand 11897 states and 14748 transitions. [2021-11-23 16:49:22,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:22,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:22,348 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:49:22,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-23 16:49:22,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:22,552 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:22,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:22,552 INFO L85 PathProgramCache]: Analyzing trace with hash -691179991, now seen corresponding path program 1 times [2021-11-23 16:49:22,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:22,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [355027681] [2021-11-23 16:49:22,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:22,553 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:22,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:22,554 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:22,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 16:49:22,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:22,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:22,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:24,755 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:24,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:25,244 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:25,245 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:25,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [355027681] [2021-11-23 16:49:25,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [355027681] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:25,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1658631099] [2021-11-23 16:49:25,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:25,245 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:25,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:25,246 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:25,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 16:49:25,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:25,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:25,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:27,455 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:27,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:27,789 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:27,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1658631099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:27,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75592769] [2021-11-23 16:49:27,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:27,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:27,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:27,790 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:27,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 16:49:27,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:27,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:49:27,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:29,766 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:49:29,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:30,463 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:49:30,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75592769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:30,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:30,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:49:30,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934925228] [2021-11-23 16:49:30,464 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:30,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:49:30,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:30,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:49:30,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:49:30,466 INFO L87 Difference]: Start difference. First operand 11897 states and 14748 transitions. Second operand has 34 states, 34 states have (on average 12.647058823529411) internal successors, (430), 33 states have internal predecessors, (430), 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 16:49:32,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:32,252 INFO L93 Difference]: Finished difference Result 18275 states and 22669 transitions. [2021-11-23 16:49:32,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:49:32,253 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.647058823529411) internal successors, (430), 33 states have internal predecessors, (430), 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 133 [2021-11-23 16:49:32,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:32,267 INFO L225 Difference]: With dead ends: 18275 [2021-11-23 16:49:32,267 INFO L226 Difference]: Without dead ends: 11961 [2021-11-23 16:49:32,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 764 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=252, Invalid=1640, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:49:32,276 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 181 mSDsluCounter, 1443 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 1541 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 187 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:32,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 1541 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 117 Invalid, 0 Unknown, 187 Unchecked, 0.1s Time] [2021-11-23 16:49:32,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11961 states. [2021-11-23 16:49:33,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11961 to 11897. [2021-11-23 16:49:33,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11897 states, 11896 states have (on average 1.2397444519166105) internal successors, (14748), 11896 states have internal predecessors, (14748), 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 16:49:33,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11897 states to 11897 states and 14748 transitions. [2021-11-23 16:49:33,658 INFO L78 Accepts]: Start accepts. Automaton has 11897 states and 14748 transitions. Word has length 133 [2021-11-23 16:49:33,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:33,659 INFO L470 AbstractCegarLoop]: Abstraction has 11897 states and 14748 transitions. [2021-11-23 16:49:33,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.647058823529411) internal successors, (430), 33 states have internal predecessors, (430), 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 16:49:33,659 INFO L276 IsEmpty]: Start isEmpty. Operand 11897 states and 14748 transitions. [2021-11-23 16:49:33,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:33,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:33,665 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:49:33,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:33,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Ended with exit code 0 [2021-11-23 16:49:34,083 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Ended with exit code 0 [2021-11-23 16:49:34,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:34,282 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:34,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:34,282 INFO L85 PathProgramCache]: Analyzing trace with hash 462766115, now seen corresponding path program 1 times [2021-11-23 16:49:34,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:34,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [416773721] [2021-11-23 16:49:34,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:34,283 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:34,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:34,284 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:34,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 16:49:34,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:34,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:34,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:36,501 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:36,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:37,056 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:37,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:37,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [416773721] [2021-11-23 16:49:37,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [416773721] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:37,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1835862809] [2021-11-23 16:49:37,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:37,057 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:37,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:37,058 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:37,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 16:49:37,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:37,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:37,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:39,851 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:39,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:40,263 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:40,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1835862809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:40,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6975903] [2021-11-23 16:49:40,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:40,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:40,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:40,264 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:40,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 16:49:40,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:40,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:49:40,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:42,128 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 85 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:49:42,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:42,884 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 85 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:49:42,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6975903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:42,885 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:42,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:49:42,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043388810] [2021-11-23 16:49:42,885 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:42,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:49:42,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:42,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:49:42,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:49:42,887 INFO L87 Difference]: Start difference. First operand 11897 states and 14748 transitions. Second operand has 34 states, 34 states have (on average 12.970588235294118) internal successors, (441), 33 states have internal predecessors, (441), 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 16:49:44,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:44,647 INFO L93 Difference]: Finished difference Result 15177 states and 18838 transitions. [2021-11-23 16:49:44,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:49:44,647 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.970588235294118) internal successors, (441), 33 states have internal predecessors, (441), 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 133 [2021-11-23 16:49:44,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:44,660 INFO L225 Difference]: With dead ends: 15177 [2021-11-23 16:49:44,660 INFO L226 Difference]: Without dead ends: 12015 [2021-11-23 16:49:44,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 805 GetRequests, 763 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=253, Invalid=1639, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:49:44,665 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 158 mSDsluCounter, 1470 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 1570 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 143 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:44,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 1570 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 102 Invalid, 0 Unknown, 143 Unchecked, 0.1s Time] [2021-11-23 16:49:44,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12015 states. [2021-11-23 16:49:45,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12015 to 12015. [2021-11-23 16:49:45,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12015 states, 12014 states have (on average 1.2386382553687365) internal successors, (14881), 12014 states have internal predecessors, (14881), 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 16:49:46,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12015 states to 12015 states and 14881 transitions. [2021-11-23 16:49:46,011 INFO L78 Accepts]: Start accepts. Automaton has 12015 states and 14881 transitions. Word has length 133 [2021-11-23 16:49:46,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:46,012 INFO L470 AbstractCegarLoop]: Abstraction has 12015 states and 14881 transitions. [2021-11-23 16:49:46,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.970588235294118) internal successors, (441), 33 states have internal predecessors, (441), 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 16:49:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 12015 states and 14881 transitions. [2021-11-23 16:49:46,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:46,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:46,016 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:49:46,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:46,236 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 16:49:46,418 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Ended with exit code 0 [2021-11-23 16:49:46,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:46,617 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:46,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:46,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1519223744, now seen corresponding path program 1 times [2021-11-23 16:49:46,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:46,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1528358657] [2021-11-23 16:49:46,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:46,618 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:46,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:46,618 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:46,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 16:49:46,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:46,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:46,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:48,831 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:48,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:49,388 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:49,388 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:49,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1528358657] [2021-11-23 16:49:49,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1528358657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:49,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1612923167] [2021-11-23 16:49:49,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:49,389 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:49,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:49,390 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:49,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 16:49:49,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:49,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:49,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:52,160 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:52,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:52,614 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:52,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1612923167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:52,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562447119] [2021-11-23 16:49:52,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:52,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:52,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:52,621 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:52,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 16:49:52,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:52,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:49:52,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:54,760 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 85 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:49:54,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:55,412 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 13 proven. 85 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:49:55,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562447119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:55,412 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:55,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:49:55,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943770878] [2021-11-23 16:49:55,413 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:55,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:49:55,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:55,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:49:55,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:49:55,414 INFO L87 Difference]: Start difference. First operand 12015 states and 14881 transitions. Second operand has 34 states, 34 states have (on average 12.970588235294118) internal successors, (441), 33 states have internal predecessors, (441), 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 16:49:57,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:57,132 INFO L93 Difference]: Finished difference Result 15273 states and 18942 transitions. [2021-11-23 16:49:57,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:49:57,133 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.970588235294118) internal successors, (441), 33 states have internal predecessors, (441), 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 133 [2021-11-23 16:49:57,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:57,144 INFO L225 Difference]: With dead ends: 15273 [2021-11-23 16:49:57,144 INFO L226 Difference]: Without dead ends: 12127 [2021-11-23 16:49:57,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 805 GetRequests, 763 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:49:57,149 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 137 mSDsluCounter, 1793 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 1891 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 203 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:57,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 1891 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 105 Invalid, 0 Unknown, 203 Unchecked, 0.1s Time] [2021-11-23 16:49:57,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12127 states. [2021-11-23 16:49:58,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12127 to 12063. [2021-11-23 16:49:58,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12063 states, 12062 states have (on average 1.2376886088542531) internal successors, (14929), 12062 states have internal predecessors, (14929), 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 16:49:58,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12063 states to 12063 states and 14929 transitions. [2021-11-23 16:49:58,459 INFO L78 Accepts]: Start accepts. Automaton has 12063 states and 14929 transitions. Word has length 133 [2021-11-23 16:49:58,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:58,460 INFO L470 AbstractCegarLoop]: Abstraction has 12063 states and 14929 transitions. [2021-11-23 16:49:58,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.970588235294118) internal successors, (441), 33 states have internal predecessors, (441), 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 16:49:58,460 INFO L276 IsEmpty]: Start isEmpty. Operand 12063 states and 14929 transitions. [2021-11-23 16:49:58,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 16:49:58,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:58,464 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:49:58,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:58,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:58,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Ended with exit code 0 [2021-11-23 16:49:59,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:59,065 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:59,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:59,065 INFO L85 PathProgramCache]: Analyzing trace with hash 417942817, now seen corresponding path program 1 times [2021-11-23 16:49:59,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:59,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [157827802] [2021-11-23 16:49:59,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:59,066 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:59,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:59,066 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:59,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 16:49:59,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:59,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:49:59,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:59,848 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:49:59,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:59,848 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:59,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [157827802] [2021-11-23 16:49:59,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [157827802] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:59,849 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:59,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:59,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886448570] [2021-11-23 16:49:59,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:59,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:49:59,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:59,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:49:59,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:59,850 INFO L87 Difference]: Start difference. First operand 12063 states and 14929 transitions. Second operand has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 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 16:50:02,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:02,157 INFO L93 Difference]: Finished difference Result 28753 states and 35720 transitions. [2021-11-23 16:50:02,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:50:02,158 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 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 133 [2021-11-23 16:50:02,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:02,184 INFO L225 Difference]: With dead ends: 28753 [2021-11-23 16:50:02,184 INFO L226 Difference]: Without dead ends: 21650 [2021-11-23 16:50:02,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:50:02,194 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 73 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:02,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 276 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 63 Unchecked, 0.0s Time] [2021-11-23 16:50:02,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21650 states. [2021-11-23 16:50:04,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21650 to 21480. [2021-11-23 16:50:04,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21480 states, 21479 states have (on average 1.231528469668048) internal successors, (26452), 21479 states have internal predecessors, (26452), 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 16:50:04,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21480 states to 21480 states and 26452 transitions. [2021-11-23 16:50:04,669 INFO L78 Accepts]: Start accepts. Automaton has 21480 states and 26452 transitions. Word has length 133 [2021-11-23 16:50:04,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:04,669 INFO L470 AbstractCegarLoop]: Abstraction has 21480 states and 26452 transitions. [2021-11-23 16:50:04,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 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 16:50:04,670 INFO L276 IsEmpty]: Start isEmpty. Operand 21480 states and 26452 transitions. [2021-11-23 16:50:04,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 16:50:04,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:04,674 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:50:04,681 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Ended with exit code 0 [2021-11-23 16:50:04,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:04,875 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:04,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:04,875 INFO L85 PathProgramCache]: Analyzing trace with hash 1404822043, now seen corresponding path program 1 times [2021-11-23 16:50:04,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:04,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [630698515] [2021-11-23 16:50:04,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:04,876 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:04,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:04,876 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:04,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2021-11-23 16:50:05,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:05,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:50:05,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:06,235 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:50:06,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:06,729 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:50:06,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:06,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [630698515] [2021-11-23 16:50:06,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [630698515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:06,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [888770047] [2021-11-23 16:50:06,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:06,730 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:06,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:06,731 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:06,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Waiting until timeout for monitored process [2021-11-23 16:50:06,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:06,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:50:06,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:08,335 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:50:08,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:08,845 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:50:08,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [888770047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:08,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345706034] [2021-11-23 16:50:08,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:08,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:08,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:08,846 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:08,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 16:50:08,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:08,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:50:08,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:10,113 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:50:10,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:10,546 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 16:50:10,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345706034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:10,546 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:10,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:50:10,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947387274] [2021-11-23 16:50:10,547 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:10,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:50:10,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:10,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:50:10,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:50:10,548 INFO L87 Difference]: Start difference. First operand 21480 states and 26452 transitions. Second operand has 16 states, 16 states have (on average 13.375) internal successors, (214), 15 states have internal predecessors, (214), 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 16:50:13,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:13,400 INFO L93 Difference]: Finished difference Result 35146 states and 43291 transitions. [2021-11-23 16:50:13,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:50:13,400 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 13.375) internal successors, (214), 15 states have internal predecessors, (214), 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 134 [2021-11-23 16:50:13,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:13,429 INFO L225 Difference]: With dead ends: 35146 [2021-11-23 16:50:13,429 INFO L226 Difference]: Without dead ends: 22824 [2021-11-23 16:50:13,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 786 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:50:13,440 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 128 mSDsluCounter, 768 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 869 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:13,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 869 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 76 Invalid, 0 Unknown, 91 Unchecked, 0.1s Time] [2021-11-23 16:50:13,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22824 states. [2021-11-23 16:50:16,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22824 to 22692. [2021-11-23 16:50:16,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22692 states, 22691 states have (on average 1.227623286765678) internal successors, (27856), 22691 states have internal predecessors, (27856), 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 16:50:16,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22692 states to 22692 states and 27856 transitions. [2021-11-23 16:50:16,169 INFO L78 Accepts]: Start accepts. Automaton has 22692 states and 27856 transitions. Word has length 134 [2021-11-23 16:50:16,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:16,169 INFO L470 AbstractCegarLoop]: Abstraction has 22692 states and 27856 transitions. [2021-11-23 16:50:16,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 13.375) internal successors, (214), 15 states have internal predecessors, (214), 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 16:50:16,169 INFO L276 IsEmpty]: Start isEmpty. Operand 22692 states and 27856 transitions. [2021-11-23 16:50:16,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 16:50:16,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:16,174 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:50:16,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:16,394 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-23 16:50:16,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Ended with exit code 0 [2021-11-23 16:50:16,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:16,775 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:16,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:16,775 INFO L85 PathProgramCache]: Analyzing trace with hash 907927334, now seen corresponding path program 1 times [2021-11-23 16:50:16,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:16,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [731571711] [2021-11-23 16:50:16,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:16,776 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:16,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:16,777 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:16,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Waiting until timeout for monitored process [2021-11-23 16:50:16,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:16,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:50:16,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:19,376 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 40 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:19,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:20,438 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:20,439 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:20,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [731571711] [2021-11-23 16:50:20,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [731571711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:20,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [773519151] [2021-11-23 16:50:20,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:20,439 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:20,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:20,442 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:20,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Waiting until timeout for monitored process [2021-11-23 16:50:20,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:20,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:50:20,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:26,581 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 40 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:26,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:28,176 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 40 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:28,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [773519151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:28,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340566806] [2021-11-23 16:50:28,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:28,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:28,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:28,177 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:28,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 16:50:28,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:28,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 16:50:28,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:36,838 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 73 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 16:50:36,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:41,678 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:41,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340566806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:41,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:41,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 20, 16, 28, 29] total 116 [2021-11-23 16:50:41,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39200838] [2021-11-23 16:50:41,679 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:41,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-23 16:50:41,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:41,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-23 16:50:41,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1209, Invalid=12131, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 16:50:41,683 INFO L87 Difference]: Start difference. First operand 22692 states and 27856 transitions. Second operand has 116 states, 116 states have (on average 5.258620689655173) internal successors, (610), 116 states have internal predecessors, (610), 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 16:51:14,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:14,109 INFO L93 Difference]: Finished difference Result 61200 states and 73757 transitions. [2021-11-23 16:51:14,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-23 16:51:14,110 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 5.258620689655173) internal successors, (610), 116 states have internal predecessors, (610), 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 134 [2021-11-23 16:51:14,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:14,215 INFO L225 Difference]: With dead ends: 61200 [2021-11-23 16:51:14,215 INFO L226 Difference]: Without dead ends: 60482 [2021-11-23 16:51:14,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 880 GetRequests, 692 SyntacticMatches, 1 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12603 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=2901, Invalid=32631, Unknown=0, NotChecked=0, Total=35532 [2021-11-23 16:51:14,230 INFO L933 BasicCegarLoop]: 301 mSDtfsCounter, 1458 mSDsluCounter, 9648 mSDsCounter, 0 mSdLazyCounter, 2534 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 9949 SdHoareTripleChecker+Invalid, 3203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 598 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:14,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 9949 Invalid, 3203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2534 Invalid, 0 Unknown, 598 Unchecked, 4.4s Time] [2021-11-23 16:51:14,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60482 states. [2021-11-23 16:51:18,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60482 to 22636. [2021-11-23 16:51:18,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22636 states, 22635 states have (on average 1.2278771813563065) internal successors, (27793), 22635 states have internal predecessors, (27793), 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 16:51:18,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22636 states to 22636 states and 27793 transitions. [2021-11-23 16:51:18,913 INFO L78 Accepts]: Start accepts. Automaton has 22636 states and 27793 transitions. Word has length 134 [2021-11-23 16:51:18,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:18,914 INFO L470 AbstractCegarLoop]: Abstraction has 22636 states and 27793 transitions. [2021-11-23 16:51:18,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 5.258620689655173) internal successors, (610), 116 states have internal predecessors, (610), 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 16:51:18,914 INFO L276 IsEmpty]: Start isEmpty. Operand 22636 states and 27793 transitions. [2021-11-23 16:51:18,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 16:51:18,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:18,918 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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] [2021-11-23 16:51:18,925 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Ended with exit code 0 [2021-11-23 16:51:19,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:19,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Ended with exit code 0 [2021-11-23 16:51:19,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:19,519 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:19,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:19,520 INFO L85 PathProgramCache]: Analyzing trace with hash -2079347701, now seen corresponding path program 1 times [2021-11-23 16:51:19,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:19,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1808689852] [2021-11-23 16:51:19,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:19,520 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:19,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:19,521 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:19,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 16:51:19,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:19,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:19,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:21,010 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 21 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:21,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:21,505 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 21 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:21,505 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:21,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1808689852] [2021-11-23 16:51:21,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1808689852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:21,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1947417585] [2021-11-23 16:51:21,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:21,506 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:21,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:21,506 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:21,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Waiting until timeout for monitored process [2021-11-23 16:51:21,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:21,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:21,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:23,269 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 21 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:23,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:23,796 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 21 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:23,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1947417585] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:23,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595360311] [2021-11-23 16:51:23,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:23,797 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:23,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:23,798 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:23,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-23 16:51:23,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:23,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:23,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:25,350 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 21 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:25,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:25,785 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 21 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:51:25,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595360311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:25,786 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:25,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:25,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628328954] [2021-11-23 16:51:25,786 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:25,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:25,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:25,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:25,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:25,788 INFO L87 Difference]: Start difference. First operand 22636 states and 27793 transitions. Second operand has 16 states, 16 states have (on average 13.75) internal successors, (220), 15 states have internal predecessors, (220), 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 16:51:30,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:30,042 INFO L93 Difference]: Finished difference Result 34182 states and 42066 transitions. [2021-11-23 16:51:30,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:51:30,042 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 13.75) internal successors, (220), 15 states have internal predecessors, (220), 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 134 [2021-11-23 16:51:30,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:30,065 INFO L225 Difference]: With dead ends: 34182 [2021-11-23 16:51:30,065 INFO L226 Difference]: Without dead ends: 21572 [2021-11-23 16:51:30,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 786 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:51:30,076 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 183 mSDsluCounter, 848 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 958 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 163 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:30,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 958 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 163 Unchecked, 0.1s Time] [2021-11-23 16:51:30,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21572 states. [2021-11-23 16:51:34,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21572 to 21508. [2021-11-23 16:51:34,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21508 states, 21507 states have (on average 1.2202073743432371) internal successors, (26243), 21507 states have internal predecessors, (26243), 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 16:51:34,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21508 states to 21508 states and 26243 transitions. [2021-11-23 16:51:34,552 INFO L78 Accepts]: Start accepts. Automaton has 21508 states and 26243 transitions. Word has length 134 [2021-11-23 16:51:34,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:34,553 INFO L470 AbstractCegarLoop]: Abstraction has 21508 states and 26243 transitions. [2021-11-23 16:51:34,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 13.75) internal successors, (220), 15 states have internal predecessors, (220), 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 16:51:34,553 INFO L276 IsEmpty]: Start isEmpty. Operand 21508 states and 26243 transitions. [2021-11-23 16:51:34,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:51:34,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:34,557 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:51:34,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:34,759 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Ended with exit code 0 [2021-11-23 16:51:34,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:35,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:35,158 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:35,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:35,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1911247090, now seen corresponding path program 1 times [2021-11-23 16:51:35,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:35,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [124981710] [2021-11-23 16:51:35,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:35,159 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:35,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:35,163 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:35,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Waiting until timeout for monitored process [2021-11-23 16:51:35,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:35,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:51:35,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:38,040 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:38,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:39,364 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:39,364 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:39,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [124981710] [2021-11-23 16:51:39,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [124981710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:39,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [834894579] [2021-11-23 16:51:39,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:39,365 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:39,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:39,366 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:39,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Waiting until timeout for monitored process [2021-11-23 16:51:39,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:39,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:51:39,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:50,281 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:50,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:54,102 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:54,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [834894579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:54,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507695557] [2021-11-23 16:51:54,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:54,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:54,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:54,104 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:54,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-23 16:51:54,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:54,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 16:51:54,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:08,235 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:08,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:12,897 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:12,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507695557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:12,898 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:12,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 29, 26, 28, 24] total 120 [2021-11-23 16:52:12,898 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331802088] [2021-11-23 16:52:12,898 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:12,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2021-11-23 16:52:12,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:12,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-11-23 16:52:12,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=844, Invalid=13436, Unknown=0, NotChecked=0, Total=14280 [2021-11-23 16:52:12,900 INFO L87 Difference]: Start difference. First operand 21508 states and 26243 transitions. Second operand has 120 states, 120 states have (on average 5.35) internal successors, (642), 120 states have internal predecessors, (642), 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 16:52:26,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:26,979 INFO L93 Difference]: Finished difference Result 28793 states and 35077 transitions. [2021-11-23 16:52:26,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-23 16:52:26,979 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 5.35) internal successors, (642), 120 states have internal predecessors, (642), 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 135 [2021-11-23 16:52:26,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:27,015 INFO L225 Difference]: With dead ends: 28793 [2021-11-23 16:52:27,015 INFO L226 Difference]: Without dead ends: 27585 [2021-11-23 16:52:27,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 689 SyntacticMatches, 17 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9693 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=1447, Invalid=21809, Unknown=0, NotChecked=0, Total=23256 [2021-11-23 16:52:27,022 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 673 mSDsluCounter, 6462 mSDsCounter, 0 mSdLazyCounter, 1133 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 673 SdHoareTripleChecker+Valid, 6619 SdHoareTripleChecker+Invalid, 2241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1082 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:27,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [673 Valid, 6619 Invalid, 2241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1133 Invalid, 0 Unknown, 1082 Unchecked, 1.2s Time] [2021-11-23 16:52:27,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27585 states. [2021-11-23 16:52:31,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27585 to 21502. [2021-11-23 16:52:31,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21502 states, 21501 states have (on average 1.2200362773824474) internal successors, (26232), 21501 states have internal predecessors, (26232), 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 16:52:31,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21502 states to 21502 states and 26232 transitions. [2021-11-23 16:52:31,099 INFO L78 Accepts]: Start accepts. Automaton has 21502 states and 26232 transitions. Word has length 135 [2021-11-23 16:52:31,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:31,100 INFO L470 AbstractCegarLoop]: Abstraction has 21502 states and 26232 transitions. [2021-11-23 16:52:31,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 5.35) internal successors, (642), 120 states have internal predecessors, (642), 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 16:52:31,100 INFO L276 IsEmpty]: Start isEmpty. Operand 21502 states and 26232 transitions. [2021-11-23 16:52:31,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:52:31,104 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:31,104 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:52:31,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Ended with exit code 0 [2021-11-23 16:52:31,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Ended with exit code 0 [2021-11-23 16:52:31,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:31,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:31,706 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:31,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:31,706 INFO L85 PathProgramCache]: Analyzing trace with hash 1697449809, now seen corresponding path program 1 times [2021-11-23 16:52:31,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:31,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1888094975] [2021-11-23 16:52:31,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:31,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:31,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:31,707 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:31,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Waiting until timeout for monitored process [2021-11-23 16:52:31,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:31,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:52:31,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:35,431 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:35,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:37,788 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:37,789 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:37,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1888094975] [2021-11-23 16:52:37,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1888094975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:37,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [821714828] [2021-11-23 16:52:37,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:37,789 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:37,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:37,790 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:37,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Waiting until timeout for monitored process [2021-11-23 16:52:38,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:38,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:52:38,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:42,056 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:42,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:43,334 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:43,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [821714828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:43,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38667881] [2021-11-23 16:52:43,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:43,334 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:43,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:43,336 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:43,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-23 16:52:43,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:43,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:52:43,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:53,681 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:53,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:59,106 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:59,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38667881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:59,107 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:59,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 16, 14, 26, 22] total 111 [2021-11-23 16:52:59,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460175170] [2021-11-23 16:52:59,107 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:59,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-23 16:52:59,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:59,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-23 16:52:59,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=11424, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 16:52:59,110 INFO L87 Difference]: Start difference. First operand 21502 states and 26232 transitions. Second operand has 111 states, 111 states have (on average 6.54954954954955) internal successors, (727), 111 states have internal predecessors, (727), 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 16:53:19,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:19,242 INFO L93 Difference]: Finished difference Result 26890 states and 32755 transitions. [2021-11-23 16:53:19,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-23 16:53:19,243 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 6.54954954954955) internal successors, (727), 111 states have internal predecessors, (727), 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 135 [2021-11-23 16:53:19,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:19,275 INFO L225 Difference]: With dead ends: 26890 [2021-11-23 16:53:19,275 INFO L226 Difference]: Without dead ends: 26240 [2021-11-23 16:53:19,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 716 SyntacticMatches, 13 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 9071 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=2106, Invalid=25950, Unknown=0, NotChecked=0, Total=28056 [2021-11-23 16:53:19,281 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 1230 mSDsluCounter, 9532 mSDsCounter, 0 mSdLazyCounter, 1203 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1230 SdHoareTripleChecker+Valid, 9733 SdHoareTripleChecker+Invalid, 3268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2030 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:19,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1230 Valid, 9733 Invalid, 3268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1203 Invalid, 0 Unknown, 2030 Unchecked, 1.1s Time] [2021-11-23 16:53:19,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26240 states. [2021-11-23 16:53:23,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26240 to 21778. [2021-11-23 16:53:23,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21778 states, 21777 states have (on average 1.2198649951783993) internal successors, (26565), 21777 states have internal predecessors, (26565), 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 16:53:23,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21778 states to 21778 states and 26565 transitions. [2021-11-23 16:53:23,629 INFO L78 Accepts]: Start accepts. Automaton has 21778 states and 26565 transitions. Word has length 135 [2021-11-23 16:53:23,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:23,629 INFO L470 AbstractCegarLoop]: Abstraction has 21778 states and 26565 transitions. [2021-11-23 16:53:23,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 6.54954954954955) internal successors, (727), 111 states have internal predecessors, (727), 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 16:53:23,630 INFO L276 IsEmpty]: Start isEmpty. Operand 21778 states and 26565 transitions. [2021-11-23 16:53:23,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:53:23,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:23,634 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:53:23,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:23,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:24,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Ended with exit code 0 [2021-11-23 16:53:24,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:24,235 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:24,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:24,235 INFO L85 PathProgramCache]: Analyzing trace with hash 46890030, now seen corresponding path program 1 times [2021-11-23 16:53:24,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:24,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [628999859] [2021-11-23 16:53:24,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:24,236 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:24,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:24,237 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:24,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (127)] Waiting until timeout for monitored process [2021-11-23 16:53:24,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:24,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:53:24,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:27,287 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:27,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:28,641 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:28,641 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:28,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [628999859] [2021-11-23 16:53:28,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [628999859] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:28,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1048018495] [2021-11-23 16:53:28,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:28,642 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:28,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:28,643 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:28,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (128)] Waiting until timeout for monitored process [2021-11-23 16:53:28,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:28,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 16:53:28,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:36,086 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:36,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:41,472 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 18 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:41,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1048018495] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:41,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052301409] [2021-11-23 16:53:41,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:41,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:41,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:41,476 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:41,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-23 16:53:41,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:41,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:53:41,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:46,330 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:46,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:47,798 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:47,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052301409] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:47,799 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:47,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 30, 29, 15, 14] total 112 [2021-11-23 16:53:47,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743719607] [2021-11-23 16:53:47,800 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:47,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2021-11-23 16:53:47,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:47,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-11-23 16:53:47,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1129, Invalid=11303, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 16:53:47,802 INFO L87 Difference]: Start difference. First operand 21778 states and 26565 transitions. Second operand has 112 states, 112 states have (on average 6.151785714285714) internal successors, (689), 112 states have internal predecessors, (689), 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 16:53:56,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:56,248 INFO L93 Difference]: Finished difference Result 25971 states and 31864 transitions. [2021-11-23 16:53:56,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-23 16:53:56,249 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 6.151785714285714) internal successors, (689), 112 states have internal predecessors, (689), 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 135 [2021-11-23 16:53:56,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:56,276 INFO L225 Difference]: With dead ends: 25971 [2021-11-23 16:53:56,276 INFO L226 Difference]: Without dead ends: 23336 [2021-11-23 16:53:56,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 698 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6352 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=1539, Invalid=14211, Unknown=0, NotChecked=0, Total=15750 [2021-11-23 16:53:56,283 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 1045 mSDsluCounter, 5371 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1045 SdHoareTripleChecker+Valid, 5508 SdHoareTripleChecker+Invalid, 2218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 921 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:56,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1045 Valid, 5508 Invalid, 2218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1257 Invalid, 0 Unknown, 921 Unchecked, 1.4s Time] [2021-11-23 16:53:56,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23336 states. [2021-11-23 16:54:00,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23336 to 21993. [2021-11-23 16:54:00,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21993 states, 21992 states have (on average 1.21989814477992) internal successors, (26828), 21992 states have internal predecessors, (26828), 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 16:54:00,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21993 states to 21993 states and 26828 transitions. [2021-11-23 16:54:00,468 INFO L78 Accepts]: Start accepts. Automaton has 21993 states and 26828 transitions. Word has length 135 [2021-11-23 16:54:00,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:00,469 INFO L470 AbstractCegarLoop]: Abstraction has 21993 states and 26828 transitions. [2021-11-23 16:54:00,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 6.151785714285714) internal successors, (689), 112 states have internal predecessors, (689), 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 16:54:00,469 INFO L276 IsEmpty]: Start isEmpty. Operand 21993 states and 26828 transitions. [2021-11-23 16:54:00,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:54:00,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:00,473 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:54:00,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (127)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:00,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (128)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:00,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:01,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:01,074 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:01,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:01,075 INFO L85 PathProgramCache]: Analyzing trace with hash -639380367, now seen corresponding path program 1 times [2021-11-23 16:54:01,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:01,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [795680052] [2021-11-23 16:54:01,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:01,076 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:01,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:01,077 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:01,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (130)] Waiting until timeout for monitored process [2021-11-23 16:54:01,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:01,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:01,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:02,430 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 33 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:02,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:03,142 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 52 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:03,142 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:03,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [795680052] [2021-11-23 16:54:03,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [795680052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:03,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [675896466] [2021-11-23 16:54:03,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:03,143 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:03,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:03,144 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:03,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (131)] Waiting until timeout for monitored process [2021-11-23 16:54:03,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:03,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:54:03,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:11,862 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:11,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:14,351 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 39 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:14,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [675896466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:14,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311807289] [2021-11-23 16:54:14,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:14,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:14,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:14,353 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:14,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2021-11-23 16:54:14,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:14,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:54:14,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:25,427 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 13 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:25,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:28,312 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 13 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:28,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311807289] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:28,313 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:28,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 28, 21, 23, 22] total 96 [2021-11-23 16:54:28,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390289664] [2021-11-23 16:54:28,313 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:28,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-23 16:54:28,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:28,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-23 16:54:28,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=691, Invalid=8429, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 16:54:28,315 INFO L87 Difference]: Start difference. First operand 21993 states and 26828 transitions. Second operand has 96 states, 96 states have (on average 6.760416666666667) internal successors, (649), 96 states have internal predecessors, (649), 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 16:54:49,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:49,581 INFO L93 Difference]: Finished difference Result 41095 states and 49835 transitions. [2021-11-23 16:54:49,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-23 16:54:49,582 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 6.760416666666667) internal successors, (649), 96 states have internal predecessors, (649), 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 135 [2021-11-23 16:54:49,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:49,632 INFO L225 Difference]: With dead ends: 41095 [2021-11-23 16:54:49,632 INFO L226 Difference]: Without dead ends: 39435 [2021-11-23 16:54:49,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 999 GetRequests, 780 SyntacticMatches, 36 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15678 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=3881, Invalid=30159, Unknown=0, NotChecked=0, Total=34040 [2021-11-23 16:54:49,641 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 2760 mSDsluCounter, 10576 mSDsCounter, 0 mSdLazyCounter, 1832 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2760 SdHoareTripleChecker+Valid, 10770 SdHoareTripleChecker+Invalid, 4209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2332 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:49,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2760 Valid, 10770 Invalid, 4209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1832 Invalid, 0 Unknown, 2332 Unchecked, 1.9s Time] [2021-11-23 16:54:49,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39435 states. [2021-11-23 16:54:55,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39435 to 31472. [2021-11-23 16:54:55,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31472 states, 31471 states have (on average 1.228877379174478) internal successors, (38674), 31471 states have internal predecessors, (38674), 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 16:54:55,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31472 states to 31472 states and 38674 transitions. [2021-11-23 16:54:55,710 INFO L78 Accepts]: Start accepts. Automaton has 31472 states and 38674 transitions. Word has length 135 [2021-11-23 16:54:55,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:55,710 INFO L470 AbstractCegarLoop]: Abstraction has 31472 states and 38674 transitions. [2021-11-23 16:54:55,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 6.760416666666667) internal successors, (649), 96 states have internal predecessors, (649), 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 16:54:55,711 INFO L276 IsEmpty]: Start isEmpty. Operand 31472 states and 38674 transitions. [2021-11-23 16:54:55,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:54:55,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:55,715 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:54:55,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (130)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:55,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:56,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (131)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:56,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:56,316 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:56,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:56,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1382268565, now seen corresponding path program 1 times [2021-11-23 16:54:56,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:56,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1446188481] [2021-11-23 16:54:56,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:56,317 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:56,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:56,318 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:56,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Waiting until timeout for monitored process [2021-11-23 16:54:56,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:56,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:54:56,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:59,658 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:59,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:01,679 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:01,679 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:01,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1446188481] [2021-11-23 16:55:01,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1446188481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:01,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1438896263] [2021-11-23 16:55:01,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:01,680 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:01,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:01,689 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:01,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Waiting until timeout for monitored process [2021-11-23 16:55:01,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:01,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 16:55:01,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:14,713 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 32 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:14,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:27,075 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 18 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:27,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1438896263] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:27,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584499984] [2021-11-23 16:55:27,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:27,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:27,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:27,077 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:27,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-23 16:55:27,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:27,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 16:55:27,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:32,710 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:32,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:33,725 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:33,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584499984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:33,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:33,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 36, 38, 22, 21] total 130 [2021-11-23 16:55:33,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620044782] [2021-11-23 16:55:33,725 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:33,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-11-23 16:55:33,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:33,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-11-23 16:55:33,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=15638, Unknown=0, NotChecked=0, Total=16770 [2021-11-23 16:55:33,728 INFO L87 Difference]: Start difference. First operand 31472 states and 38674 transitions. Second operand has 130 states, 130 states have (on average 4.723076923076923) internal successors, (614), 130 states have internal predecessors, (614), 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 16:56:00,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:00,177 INFO L93 Difference]: Finished difference Result 39259 states and 48255 transitions. [2021-11-23 16:56:00,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-23 16:56:00,178 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 4.723076923076923) internal successors, (614), 130 states have internal predecessors, (614), 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 135 [2021-11-23 16:56:00,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:00,224 INFO L225 Difference]: With dead ends: 39259 [2021-11-23 16:56:00,224 INFO L226 Difference]: Without dead ends: 32763 [2021-11-23 16:56:00,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 883 GetRequests, 686 SyntacticMatches, 11 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13078 ImplicationChecksByTransitivity, 37.0s TimeCoverageRelationStatistics Valid=2692, Invalid=32464, Unknown=0, NotChecked=0, Total=35156 [2021-11-23 16:56:00,237 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 1081 mSDsluCounter, 5244 mSDsCounter, 0 mSdLazyCounter, 1727 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1081 SdHoareTripleChecker+Valid, 5349 SdHoareTripleChecker+Invalid, 2785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 999 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:00,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1081 Valid, 5349 Invalid, 2785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1727 Invalid, 0 Unknown, 999 Unchecked, 2.2s Time] [2021-11-23 16:56:00,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32763 states. [2021-11-23 16:56:06,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32763 to 31571. [2021-11-23 16:56:06,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31571 states, 31570 states have (on average 1.2291415901171998) internal successors, (38804), 31570 states have internal predecessors, (38804), 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 16:56:06,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31571 states to 31571 states and 38804 transitions. [2021-11-23 16:56:06,255 INFO L78 Accepts]: Start accepts. Automaton has 31571 states and 38804 transitions. Word has length 135 [2021-11-23 16:56:06,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:06,255 INFO L470 AbstractCegarLoop]: Abstraction has 31571 states and 38804 transitions. [2021-11-23 16:56:06,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 4.723076923076923) internal successors, (614), 130 states have internal predecessors, (614), 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 16:56:06,256 INFO L276 IsEmpty]: Start isEmpty. Operand 31571 states and 38804 transitions. [2021-11-23 16:56:06,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:56:06,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:06,259 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:56:06,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:06,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:06,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:06,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:06,861 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:06,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:06,862 INFO L85 PathProgramCache]: Analyzing trace with hash -886324523, now seen corresponding path program 1 times [2021-11-23 16:56:06,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:06,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [289242160] [2021-11-23 16:56:06,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:06,863 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:06,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:06,864 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:06,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Waiting until timeout for monitored process [2021-11-23 16:56:07,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:07,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:56:07,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:07,955 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 67 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:56:07,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:08,376 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 78 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:56:08,377 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:08,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [289242160] [2021-11-23 16:56:08,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [289242160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:08,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [997176564] [2021-11-23 16:56:08,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:08,377 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:08,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:08,378 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:08,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Waiting until timeout for monitored process [2021-11-23 16:56:08,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:08,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 16:56:08,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:16,844 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 40 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:16,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:18,884 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 55 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:18,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [997176564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:18,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250463828] [2021-11-23 16:56:18,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:18,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:18,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:18,885 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:18,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2021-11-23 16:56:19,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:19,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:56:19,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:20,929 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 67 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:56:20,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:21,322 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 78 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:56:21,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250463828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:21,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:21,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 30, 19, 15, 11] total 73 [2021-11-23 16:56:21,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468421710] [2021-11-23 16:56:21,322 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:21,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-23 16:56:21,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:21,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-23 16:56:21,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=773, Invalid=4483, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 16:56:21,325 INFO L87 Difference]: Start difference. First operand 31571 states and 38804 transitions. Second operand has 73 states, 73 states have (on average 6.397260273972603) internal successors, (467), 73 states have internal predecessors, (467), 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 16:56:31,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:31,988 INFO L93 Difference]: Finished difference Result 51102 states and 63103 transitions. [2021-11-23 16:56:31,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-23 16:56:31,988 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 6.397260273972603) internal successors, (467), 73 states have internal predecessors, (467), 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 135 [2021-11-23 16:56:31,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:32,052 INFO L225 Difference]: With dead ends: 51102 [2021-11-23 16:56:32,052 INFO L226 Difference]: Without dead ends: 45262 [2021-11-23 16:56:32,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 836 GetRequests, 743 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3207 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1310, Invalid=7432, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 16:56:32,067 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 1078 mSDsluCounter, 4407 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1078 SdHoareTripleChecker+Valid, 4591 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 349 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:32,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1078 Valid, 4591 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 462 Invalid, 0 Unknown, 349 Unchecked, 0.5s Time] [2021-11-23 16:56:32,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45262 states. [2021-11-23 16:56:40,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45262 to 41841. [2021-11-23 16:56:40,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41841 states, 41840 states have (on average 1.233102294455067) internal successors, (51593), 41840 states have internal predecessors, (51593), 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 16:56:40,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41841 states to 41841 states and 51593 transitions. [2021-11-23 16:56:40,235 INFO L78 Accepts]: Start accepts. Automaton has 41841 states and 51593 transitions. Word has length 135 [2021-11-23 16:56:40,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:40,235 INFO L470 AbstractCegarLoop]: Abstraction has 41841 states and 51593 transitions. [2021-11-23 16:56:40,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 6.397260273972603) internal successors, (467), 73 states have internal predecessors, (467), 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 16:56:40,236 INFO L276 IsEmpty]: Start isEmpty. Operand 41841 states and 51593 transitions. [2021-11-23 16:56:40,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:56:40,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:40,240 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:56:40,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Ended with exit code 0 [2021-11-23 16:56:40,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Ended with exit code 0 [2021-11-23 16:56:40,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Ended with exit code 0 [2021-11-23 16:56:40,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:40,841 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:40,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:40,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1572594920, now seen corresponding path program 1 times [2021-11-23 16:56:40,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:40,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1589181338] [2021-11-23 16:56:40,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:40,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:40,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:40,843 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:40,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Waiting until timeout for monitored process [2021-11-23 16:56:40,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:40,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:56:40,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:43,929 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 23 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:43,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:44,666 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 23 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:44,666 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:44,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1589181338] [2021-11-23 16:56:44,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1589181338] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:44,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [223312163] [2021-11-23 16:56:44,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:44,666 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:44,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:44,667 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:44,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Waiting until timeout for monitored process [2021-11-23 16:56:44,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:44,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:56:44,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:48,898 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 13 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:48,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:51,618 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 13 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:51,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [223312163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:51,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414673933] [2021-11-23 16:56:51,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:51,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:51,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:51,620 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:51,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2021-11-23 16:56:51,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:51,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 16:56:51,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:56,046 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 13 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:56,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:57,259 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 13 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:57,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414673933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:57,260 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:57,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 23, 22, 22, 21] total 85 [2021-11-23 16:56:57,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646936717] [2021-11-23 16:56:57,260 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:57,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-23 16:56:57,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:57,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-23 16:56:57,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=6848, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 16:56:57,263 INFO L87 Difference]: Start difference. First operand 41841 states and 51593 transitions. Second operand has 85 states, 85 states have (on average 7.2) internal successors, (612), 85 states have internal predecessors, (612), 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 16:57:09,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:09,697 INFO L93 Difference]: Finished difference Result 45893 states and 56731 transitions. [2021-11-23 16:57:09,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 16:57:09,698 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 7.2) internal successors, (612), 85 states have internal predecessors, (612), 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 135 [2021-11-23 16:57:09,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:09,763 INFO L225 Difference]: With dead ends: 45893 [2021-11-23 16:57:09,763 INFO L226 Difference]: Without dead ends: 43447 [2021-11-23 16:57:09,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 852 GetRequests, 736 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3333 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=630, Invalid=12942, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 16:57:09,774 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 119 mSDsluCounter, 4451 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 4555 SdHoareTripleChecker+Invalid, 591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 371 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:09,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 4555 Invalid, 591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 208 Invalid, 0 Unknown, 371 Unchecked, 0.2s Time] [2021-11-23 16:57:09,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43447 states. [2021-11-23 16:57:18,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43447 to 41842. [2021-11-23 16:57:18,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41842 states, 41841 states have (on average 1.2330967233096723) internal successors, (51594), 41841 states have internal predecessors, (51594), 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 16:57:18,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41842 states to 41842 states and 51594 transitions. [2021-11-23 16:57:18,202 INFO L78 Accepts]: Start accepts. Automaton has 41842 states and 51594 transitions. Word has length 135 [2021-11-23 16:57:18,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:18,202 INFO L470 AbstractCegarLoop]: Abstraction has 41842 states and 51594 transitions. [2021-11-23 16:57:18,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 7.2) internal successors, (612), 85 states have internal predecessors, (612), 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 16:57:18,203 INFO L276 IsEmpty]: Start isEmpty. Operand 41842 states and 51594 transitions. [2021-11-23 16:57:18,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:57:18,207 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:18,208 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 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, 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 16:57:18,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:18,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:18,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Ended with exit code 0 [2021-11-23 16:57:18,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:18,809 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:18,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:18,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1979484178, now seen corresponding path program 1 times [2021-11-23 16:57:18,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:18,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [919321076] [2021-11-23 16:57:18,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:18,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:18,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:18,811 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:18,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (142)] Waiting until timeout for monitored process [2021-11-23 16:57:18,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:18,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:57:18,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:22,315 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:22,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:23,027 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 22 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:23,027 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:23,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [919321076] [2021-11-23 16:57:23,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [919321076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:23,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [883370433] [2021-11-23 16:57:23,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:23,028 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:23,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:23,029 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:23,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (143)] Waiting until timeout for monitored process [2021-11-23 16:57:23,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:23,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:57:23,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:26,915 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:26,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:29,633 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:29,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [883370433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:29,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694291740] [2021-11-23 16:57:29,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:29,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:29,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:29,635 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:29,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9253633-f459-40ab-ab17-fe769dc786a0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Waiting until timeout for monitored process [2021-11-23 16:57:29,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:29,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 16:57:29,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:33,536 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:33,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:34,454 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:34,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694291740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:34,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:34,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 23, 22, 22, 22] total 86 [2021-11-23 16:57:34,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917990659] [2021-11-23 16:57:34,455 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:34,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-23 16:57:34,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:34,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-23 16:57:34,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=7027, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 16:57:34,457 INFO L87 Difference]: Start difference. First operand 41842 states and 51594 transitions. Second operand has 86 states, 86 states have (on average 7.104651162790698) internal successors, (611), 86 states have internal predecessors, (611), 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)