./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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 5d3b64744a19af136ca9c439b2264a15465f658e2e3d4a576a98d96e4b8aff92 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:31:17,451 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:31:17,454 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:31:17,510 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:31:17,510 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:31:17,515 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:31:17,518 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:31:17,523 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:31:17,526 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:31:17,533 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:31:17,534 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:31:17,537 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:31:17,537 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:31:17,540 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:31:17,543 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:31:17,548 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:31:17,551 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:31:17,552 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:31:17,555 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:31:17,564 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:31:17,566 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:31:17,568 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:31:17,572 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:31:17,573 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:31:17,583 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:31:17,584 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:31:17,585 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:31:17,587 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:31:17,588 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:31:17,590 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:31:17,591 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:31:17,592 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:31:17,594 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:31:17,596 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:31:17,598 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:31:17,598 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:31:17,599 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:31:17,600 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:31:17,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:31:17,601 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:31:17,602 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:31:17,603 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:31:17,665 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:31:17,666 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:31:17,667 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:31:17,667 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:31:17,668 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:31:17,668 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:31:17,669 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:31:17,669 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:31:17,669 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:31:17,670 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:31:17,671 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:31:17,671 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:31:17,672 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:31:17,672 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:31:17,672 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:31:17,673 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:31:17,673 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:31:17,673 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:31:17,674 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:31:17,675 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:31:17,675 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:31:17,675 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:31:17,675 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:31:17,676 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:31:17,676 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:31:17,676 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:31:17,678 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:31:17,679 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:31:17,679 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:31:17,679 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:31:17,680 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:31:17,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:31:17,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:31:17,681 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:31:17,681 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:31:17,681 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:31:17,682 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:31:17,682 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:31:17,682 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:31:17,682 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:31:17,683 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:31:17,683 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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5d3b64744a19af136ca9c439b2264a15465f658e2e3d4a576a98d96e4b8aff92 [2021-11-23 17:31:18,041 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:31:18,075 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:31:18,078 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:31:18,080 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:31:18,081 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:31:18,083 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c [2021-11-23 17:31:18,181 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/c67c1c4f0/acb8da2fdc1d4dfd82a80b68847948ed/FLAG1dfbc8f8d [2021-11-23 17:31:18,860 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:31:18,860 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c [2021-11-23 17:31:18,882 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/c67c1c4f0/acb8da2fdc1d4dfd82a80b68847948ed/FLAG1dfbc8f8d [2021-11-23 17:31:19,151 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/c67c1c4f0/acb8da2fdc1d4dfd82a80b68847948ed [2021-11-23 17:31:19,157 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:31:19,160 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:31:19,162 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:31:19,162 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:31:19,168 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:31:19,169 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,172 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47bef405 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19, skipping insertion in model container [2021-11-23 17:31:19,172 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,182 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:31:19,236 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:31:19,583 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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c[8246,8259] [2021-11-23 17:31:19,594 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:31:19,605 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:31:19,654 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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c[8246,8259] [2021-11-23 17:31:19,655 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:31:19,672 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:31:19,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19 WrapperNode [2021-11-23 17:31:19,673 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:31:19,675 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:31:19,675 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:31:19,675 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:31:19,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,721 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,775 INFO L137 Inliner]: procedures = 22, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 275 [2021-11-23 17:31:19,776 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:31:19,777 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:31:19,777 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:31:19,777 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:31:19,790 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,791 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,810 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,810 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,820 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,847 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,851 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:31:19,852 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:31:19,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:31:19,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:31:19,866 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:19" (1/1) ... [2021-11-23 17:31:19,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:31:19,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:19,907 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:31:19,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:31:19,959 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:31:19,959 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:31:19,959 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:31:19,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:31:20,057 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:31:20,058 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:31:20,501 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:31:20,545 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 17:31:20,550 INFO L158 Benchmark]: Toolchain (without parser) took 1389.31ms. Allocated memory is still 96.5MB. Free memory was 64.1MB in the beginning and 45.2MB in the end (delta: 18.9MB). Peak memory consumption was 18.4MB. Max. memory is 16.1GB. [2021-11-23 17:31:20,551 INFO L158 Benchmark]: CDTParser took 0.43ms. Allocated memory is still 96.5MB. Free memory was 50.2MB in the beginning and 50.1MB in the end (delta: 44.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:31:20,552 INFO L158 Benchmark]: CACSL2BoogieTranslator took 511.71ms. Allocated memory is still 96.5MB. Free memory was 63.8MB in the beginning and 69.9MB in the end (delta: -6.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:31:20,553 INFO L158 Benchmark]: Boogie Procedure Inliner took 101.34ms. Allocated memory is still 96.5MB. Free memory was 69.9MB in the beginning and 67.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:31:20,555 INFO L158 Benchmark]: Boogie Preprocessor took 74.83ms. Allocated memory is still 96.5MB. Free memory was 67.8MB in the beginning and 66.0MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:31:20,556 INFO L158 Benchmark]: RCFGBuilder took 695.91ms. Allocated memory is still 96.5MB. Free memory was 66.0MB in the beginning and 45.2MB in the end (delta: 20.9MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-11-23 17:31:20,560 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.43ms. Allocated memory is still 96.5MB. Free memory was 50.2MB in the beginning and 50.1MB in the end (delta: 44.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 511.71ms. Allocated memory is still 96.5MB. Free memory was 63.8MB in the beginning and 69.9MB in the end (delta: -6.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 101.34ms. Allocated memory is still 96.5MB. Free memory was 69.9MB in the beginning and 67.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 74.83ms. Allocated memory is still 96.5MB. Free memory was 67.8MB in the beginning and 66.0MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 695.91ms. Allocated memory is still 96.5MB. Free memory was 66.0MB in the beginning and 45.2MB in the end (delta: 20.9MB). Peak memory consumption was 21.0MB. 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 17:31:20,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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 5d3b64744a19af136ca9c439b2264a15465f658e2e3d4a576a98d96e4b8aff92 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:31:23,499 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:31:23,502 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:31:23,542 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:31:23,543 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:31:23,545 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:31:23,547 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:31:23,550 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:31:23,554 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:31:23,555 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:31:23,557 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:31:23,559 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:31:23,560 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:31:23,562 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:31:23,564 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:31:23,566 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:31:23,567 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:31:23,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:31:23,575 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:31:23,579 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:31:23,581 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:31:23,587 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:31:23,589 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:31:23,590 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:31:23,595 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:31:23,596 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:31:23,597 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:31:23,598 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:31:23,599 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:31:23,601 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:31:23,601 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:31:23,603 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:31:23,604 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:31:23,605 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:31:23,607 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:31:23,607 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:31:23,608 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:31:23,609 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:31:23,609 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:31:23,611 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:31:23,612 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:31:23,613 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:31:23,647 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:31:23,651 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:31:23,654 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:31:23,655 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:31:23,656 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:31:23,657 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:31:23,657 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:31:23,657 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:31:23,658 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:31:23,658 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:31:23,659 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:31:23,659 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:31:23,660 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:31:23,661 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:31:23,662 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:31:23,662 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:31:23,662 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:31:23,662 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:31:23,663 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:31:23,663 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:31:23,663 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:31:23,664 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:31:23,664 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:31:23,664 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:31:23,664 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:31:23,665 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:31:23,665 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:31:23,665 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:31:23,665 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:31:23,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:31:23,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:31:23,666 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:31:23,667 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:31:23,667 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:31:23,667 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:23,668 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:31:23,668 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:31:23,668 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:31:23,669 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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5d3b64744a19af136ca9c439b2264a15465f658e2e3d4a576a98d96e4b8aff92 [2021-11-23 17:31:24,186 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:31:24,230 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:31:24,234 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:31:24,235 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:31:24,236 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:31:24,238 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c [2021-11-23 17:31:24,331 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/5cd31a006/84db50ec7305496cae790e25fd6674be/FLAG6238f898c [2021-11-23 17:31:25,068 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:31:25,069 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c [2021-11-23 17:31:25,085 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/5cd31a006/84db50ec7305496cae790e25fd6674be/FLAG6238f898c [2021-11-23 17:31:25,362 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/data/5cd31a006/84db50ec7305496cae790e25fd6674be [2021-11-23 17:31:25,367 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:31:25,368 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:31:25,370 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:31:25,370 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:31:25,375 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:31:25,377 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:25,380 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d77d455 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25, skipping insertion in model container [2021-11-23 17:31:25,381 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:25,390 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:31:25,455 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:31:25,821 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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c[8246,8259] [2021-11-23 17:31:25,840 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:31:25,853 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:31:25,957 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_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.BOUNDED-8.pals.c[8246,8259] [2021-11-23 17:31:25,958 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:31:25,978 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:31:25,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25 WrapperNode [2021-11-23 17:31:25,979 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:31:25,980 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:31:25,981 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:31:25,981 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:31:25,989 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,013 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,063 INFO L137 Inliner]: procedures = 22, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 260 [2021-11-23 17:31:26,069 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:31:26,071 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:31:26,073 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:31:26,074 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:31:26,084 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,085 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,105 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,105 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,114 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,140 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,143 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,147 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:31:26,162 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:31:26,162 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:31:26,163 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:31:26,164 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (1/1) ... [2021-11-23 17:31:26,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:31:26,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:26,201 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:31:26,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:31:26,264 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:31:26,264 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:31:26,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:31:26,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:31:26,418 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:31:26,420 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:31:26,982 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:31:26,999 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:31:26,999 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:31:27,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:31:27 BoogieIcfgContainer [2021-11-23 17:31:27,002 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:31:27,007 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:31:27,007 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:31:27,010 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:31:27,011 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:31:25" (1/3) ... [2021-11-23 17:31:27,012 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c0c3f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:31:27, skipping insertion in model container [2021-11-23 17:31:27,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:31:25" (2/3) ... [2021-11-23 17:31:27,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c0c3f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:31:27, skipping insertion in model container [2021-11-23 17:31:27,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:31:27" (3/3) ... [2021-11-23 17:31:27,014 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.1.ufo.BOUNDED-8.pals.c [2021-11-23 17:31:27,022 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:31:27,023 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:31:27,097 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:31:27,106 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 17:31:27,106 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:31:27,131 INFO L276 IsEmpty]: Start isEmpty. Operand has 77 states, 75 states have (on average 1.7066666666666668) internal successors, (128), 76 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:27,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:31:27,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:27,143 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] [2021-11-23 17:31:27,144 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:27,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:27,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1837107710, now seen corresponding path program 1 times [2021-11-23 17:31:27,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:27,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2136378858] [2021-11-23 17:31:27,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:27,181 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:27,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:27,185 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:27,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:31:27,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:27,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:31:27,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:27,500 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 17:31:27,500 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:27,501 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:27,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2136378858] [2021-11-23 17:31:27,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2136378858] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:27,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:27,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:31:27,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718540817] [2021-11-23 17:31:27,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:27,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:31:27,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:27,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:31:27,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:31:27,549 INFO L87 Difference]: Start difference. First operand has 77 states, 75 states have (on average 1.7066666666666668) internal successors, (128), 76 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:27,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:27,579 INFO L93 Difference]: Finished difference Result 126 states and 204 transitions. [2021-11-23 17:31:27,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:31:27,582 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 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 29 [2021-11-23 17:31:27,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:27,594 INFO L225 Difference]: With dead ends: 126 [2021-11-23 17:31:27,594 INFO L226 Difference]: Without dead ends: 73 [2021-11-23 17:31:27,598 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:31:27,602 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:27,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:27,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-23 17:31:27,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-11-23 17:31:27,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.6805555555555556) internal successors, (121), 72 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:27,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 121 transitions. [2021-11-23 17:31:27,676 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 121 transitions. Word has length 29 [2021-11-23 17:31:27,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:27,676 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 121 transitions. [2021-11-23 17:31:27,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:27,677 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 121 transitions. [2021-11-23 17:31:27,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:31:27,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:27,680 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] [2021-11-23 17:31:27,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:27,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:27,903 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:27,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:27,907 INFO L85 PathProgramCache]: Analyzing trace with hash -1971121216, now seen corresponding path program 1 times [2021-11-23 17:31:27,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:27,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1127054958] [2021-11-23 17:31:27,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:27,911 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:27,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:27,912 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:27,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:31:28,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:28,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:31:28,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:28,198 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 17:31:28,198 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:28,199 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:28,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1127054958] [2021-11-23 17:31:28,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1127054958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:28,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:28,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:28,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360966731] [2021-11-23 17:31:28,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:28,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:31:28,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:28,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:31:28,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:31:28,212 INFO L87 Difference]: Start difference. First operand 73 states and 121 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:28,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:28,372 INFO L93 Difference]: Finished difference Result 165 states and 263 transitions. [2021-11-23 17:31:28,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:31:28,373 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 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 29 [2021-11-23 17:31:28,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:28,375 INFO L225 Difference]: With dead ends: 165 [2021-11-23 17:31:28,376 INFO L226 Difference]: Without dead ends: 117 [2021-11-23 17:31:28,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:28,379 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 71 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:28,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 440 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:31:28,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-23 17:31:28,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 73. [2021-11-23 17:31:28,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.3611111111111112) internal successors, (98), 72 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:28,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 98 transitions. [2021-11-23 17:31:28,395 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 98 transitions. Word has length 29 [2021-11-23 17:31:28,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:28,396 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 98 transitions. [2021-11-23 17:31:28,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:28,396 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 98 transitions. [2021-11-23 17:31:28,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:31:28,399 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:28,399 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 17:31:28,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:28,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:28,611 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:28,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:28,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1333293339, now seen corresponding path program 1 times [2021-11-23 17:31:28,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:28,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [232010273] [2021-11-23 17:31:28,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:28,628 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:28,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:28,629 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:28,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:31:28,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:28,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:28,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:28,983 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 17:31:28,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:28,984 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:28,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [232010273] [2021-11-23 17:31:28,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [232010273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:28,988 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:28,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:28,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098061341] [2021-11-23 17:31:28,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:28,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:28,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:28,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:28,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:28,995 INFO L87 Difference]: Start difference. First operand 73 states and 98 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:29,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:29,042 INFO L93 Difference]: Finished difference Result 155 states and 226 transitions. [2021-11-23 17:31:29,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:29,043 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:29,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:29,046 INFO L225 Difference]: With dead ends: 155 [2021-11-23 17:31:29,049 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 17:31:29,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 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 17:31:29,052 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 59 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 220 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 17:31:29,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 220 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:29,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 17:31:29,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2021-11-23 17:31:29,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.4351851851851851) internal successors, (155), 108 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:29,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 155 transitions. [2021-11-23 17:31:29,078 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 155 transitions. Word has length 51 [2021-11-23 17:31:29,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:29,079 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 155 transitions. [2021-11-23 17:31:29,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:29,079 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 155 transitions. [2021-11-23 17:31:29,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:31:29,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:29,086 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 17:31:29,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:29,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,300 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:29,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:29,300 INFO L85 PathProgramCache]: Analyzing trace with hash -606737519, now seen corresponding path program 1 times [2021-11-23 17:31:29,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:29,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [849525952] [2021-11-23 17:31:29,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:29,302 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:29,304 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:29,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:31:29,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:29,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:29,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:29,584 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 17:31:29,584 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:29,584 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:29,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [849525952] [2021-11-23 17:31:29,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [849525952] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:29,585 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:29,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:29,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808968540] [2021-11-23 17:31:29,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:29,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:29,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:29,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:29,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:29,588 INFO L87 Difference]: Start difference. First operand 109 states and 155 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:29,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:29,634 INFO L93 Difference]: Finished difference Result 257 states and 387 transitions. [2021-11-23 17:31:29,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:29,635 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:29,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:29,643 INFO L225 Difference]: With dead ends: 257 [2021-11-23 17:31:29,643 INFO L226 Difference]: Without dead ends: 177 [2021-11-23 17:31:29,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 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 17:31:29,646 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 55 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 219 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 17:31:29,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 219 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:29,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-11-23 17:31:29,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 175. [2021-11-23 17:31:29,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 174 states have (on average 1.4827586206896552) internal successors, (258), 174 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:29,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 258 transitions. [2021-11-23 17:31:29,688 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 258 transitions. Word has length 51 [2021-11-23 17:31:29,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:29,689 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 258 transitions. [2021-11-23 17:31:29,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:29,689 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 258 transitions. [2021-11-23 17:31:29,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:31:29,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:29,691 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 17:31:29,724 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-23 17:31:29,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,925 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:29,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:29,926 INFO L85 PathProgramCache]: Analyzing trace with hash 2093945095, now seen corresponding path program 1 times [2021-11-23 17:31:29,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:29,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1917879622] [2021-11-23 17:31:29,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:29,927 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:29,932 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:29,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:31:30,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:30,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:30,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:30,204 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 17:31:30,205 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:30,205 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:30,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1917879622] [2021-11-23 17:31:30,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1917879622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:30,213 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:30,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:30,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14870723] [2021-11-23 17:31:30,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:30,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:30,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:30,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:30,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:30,216 INFO L87 Difference]: Start difference. First operand 175 states and 258 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:30,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:30,251 INFO L93 Difference]: Finished difference Result 443 states and 676 transitions. [2021-11-23 17:31:30,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:30,252 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:30,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:30,261 INFO L225 Difference]: With dead ends: 443 [2021-11-23 17:31:30,261 INFO L226 Difference]: Without dead ends: 297 [2021-11-23 17:31:30,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 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 17:31:30,268 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 51 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 218 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 17:31:30,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 218 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:30,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-11-23 17:31:30,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 295. [2021-11-23 17:31:30,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 294 states have (on average 1.5034013605442176) internal successors, (442), 294 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:30,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 442 transitions. [2021-11-23 17:31:30,323 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 442 transitions. Word has length 51 [2021-11-23 17:31:30,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:30,323 INFO L470 AbstractCegarLoop]: Abstraction has 295 states and 442 transitions. [2021-11-23 17:31:30,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:30,324 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 442 transitions. [2021-11-23 17:31:30,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:31:30,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:30,326 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 17:31:30,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:30,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:30,544 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:30,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:30,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1863229059, now seen corresponding path program 1 times [2021-11-23 17:31:30,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:30,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [117614536] [2021-11-23 17:31:30,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:30,546 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:30,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:30,548 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:30,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:31:30,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:30,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:30,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:30,806 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 17:31:30,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:30,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:30,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [117614536] [2021-11-23 17:31:30,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [117614536] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:30,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:30,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:30,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225781070] [2021-11-23 17:31:30,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:30,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:30,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:30,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:30,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:30,810 INFO L87 Difference]: Start difference. First operand 295 states and 442 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:30,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:30,862 INFO L93 Difference]: Finished difference Result 779 states and 1188 transitions. [2021-11-23 17:31:30,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:30,863 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:30,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:30,868 INFO L225 Difference]: With dead ends: 779 [2021-11-23 17:31:30,869 INFO L226 Difference]: Without dead ends: 513 [2021-11-23 17:31:30,871 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 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 17:31:30,877 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 47 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 217 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 17:31:30,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 217 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:30,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-11-23 17:31:30,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 511. [2021-11-23 17:31:30,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 510 states have (on average 1.5019607843137255) internal successors, (766), 510 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:30,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 766 transitions. [2021-11-23 17:31:30,950 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 766 transitions. Word has length 51 [2021-11-23 17:31:30,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:30,953 INFO L470 AbstractCegarLoop]: Abstraction has 511 states and 766 transitions. [2021-11-23 17:31:30,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 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 17:31:30,954 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 766 transitions. [2021-11-23 17:31:30,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:31:30,957 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:30,958 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 17:31:30,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:31,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:31,172 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:31,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:31,173 INFO L85 PathProgramCache]: Analyzing trace with hash -645243661, now seen corresponding path program 1 times [2021-11-23 17:31:31,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:31,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [823714805] [2021-11-23 17:31:31,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:31,174 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:31,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:31,175 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:31,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:31:31,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:31,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:31,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:32,091 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 17:31:32,092 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:32,092 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:32,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [823714805] [2021-11-23 17:31:32,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [823714805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:32,093 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:32,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:31:32,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141441390] [2021-11-23 17:31:32,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:32,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:32,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:32,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:32,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:32,095 INFO L87 Difference]: Start difference. First operand 511 states and 766 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 17:31:32,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:32,365 INFO L93 Difference]: Finished difference Result 2921 states and 4451 transitions. [2021-11-23 17:31:32,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:31:32,366 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 17:31:32,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:32,388 INFO L225 Difference]: With dead ends: 2921 [2021-11-23 17:31:32,390 INFO L226 Difference]: Without dead ends: 2439 [2021-11-23 17:31:32,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:32,395 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 640 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 640 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:32,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [640 Valid, 345 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:31:32,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2439 states. [2021-11-23 17:31:32,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2439 to 1471. [2021-11-23 17:31:32,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1471 states, 1470 states have (on average 1.489795918367347) internal successors, (2190), 1470 states have internal predecessors, (2190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:32,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1471 states to 1471 states and 2190 transitions. [2021-11-23 17:31:32,525 INFO L78 Accepts]: Start accepts. Automaton has 1471 states and 2190 transitions. Word has length 51 [2021-11-23 17:31:32,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:32,526 INFO L470 AbstractCegarLoop]: Abstraction has 1471 states and 2190 transitions. [2021-11-23 17:31:32,526 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 17:31:32,527 INFO L276 IsEmpty]: Start isEmpty. Operand 1471 states and 2190 transitions. [2021-11-23 17:31:32,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:31:32,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:32,530 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 17:31:32,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:32,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:32,743 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:32,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:32,744 INFO L85 PathProgramCache]: Analyzing trace with hash 1275401347, now seen corresponding path program 1 times [2021-11-23 17:31:32,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:32,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [286688581] [2021-11-23 17:31:32,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:32,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:32,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:32,753 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:32,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:31:32,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:32,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:32,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:33,004 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 17:31:33,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:33,005 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:33,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [286688581] [2021-11-23 17:31:33,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [286688581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:33,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:33,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:33,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282150575] [2021-11-23 17:31:33,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:33,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:33,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:33,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:33,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:33,031 INFO L87 Difference]: Start difference. First operand 1471 states and 2190 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 17:31:33,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:33,170 INFO L93 Difference]: Finished difference Result 3581 states and 5342 transitions. [2021-11-23 17:31:33,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:33,171 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 17:31:33,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:33,187 INFO L225 Difference]: With dead ends: 3581 [2021-11-23 17:31:33,187 INFO L226 Difference]: Without dead ends: 2139 [2021-11-23 17:31:33,190 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 17:31:33,191 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 39 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 185 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 17:31:33,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 185 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:33,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2139 states. [2021-11-23 17:31:33,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2139 to 2137. [2021-11-23 17:31:33,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2137 states, 2136 states have (on average 1.4700374531835205) internal successors, (3140), 2136 states have internal predecessors, (3140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:33,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2137 states to 2137 states and 3140 transitions. [2021-11-23 17:31:33,346 INFO L78 Accepts]: Start accepts. Automaton has 2137 states and 3140 transitions. Word has length 53 [2021-11-23 17:31:33,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:33,346 INFO L470 AbstractCegarLoop]: Abstraction has 2137 states and 3140 transitions. [2021-11-23 17:31:33,347 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 17:31:33,347 INFO L276 IsEmpty]: Start isEmpty. Operand 2137 states and 3140 transitions. [2021-11-23 17:31:33,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:31:33,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:33,348 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 17:31:33,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:33,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:33,565 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:33,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:33,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1765655459, now seen corresponding path program 1 times [2021-11-23 17:31:33,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:33,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1415524792] [2021-11-23 17:31:33,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:33,567 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:33,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:33,568 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:33,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:31:33,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:33,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:31:33,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:33,821 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 17:31:33,822 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:33,822 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:33,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1415524792] [2021-11-23 17:31:33,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1415524792] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:33,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:33,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:33,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340092181] [2021-11-23 17:31:33,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:33,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:31:33,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:33,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:31:33,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:31:33,826 INFO L87 Difference]: Start difference. First operand 2137 states and 3140 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 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 17:31:34,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:34,148 INFO L93 Difference]: Finished difference Result 4097 states and 5931 transitions. [2021-11-23 17:31:34,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:34,149 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 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 17:31:34,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:34,175 INFO L225 Difference]: With dead ends: 4097 [2021-11-23 17:31:34,175 INFO L226 Difference]: Without dead ends: 4095 [2021-11-23 17:31:34,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:31:34,177 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 178 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:34,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 407 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:34,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4095 states. [2021-11-23 17:31:34,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4095 to 2305. [2021-11-23 17:31:34,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2305 states, 2304 states have (on average 1.4322916666666667) internal successors, (3300), 2304 states have internal predecessors, (3300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:34,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2305 states to 2305 states and 3300 transitions. [2021-11-23 17:31:34,397 INFO L78 Accepts]: Start accepts. Automaton has 2305 states and 3300 transitions. Word has length 54 [2021-11-23 17:31:34,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:34,398 INFO L470 AbstractCegarLoop]: Abstraction has 2305 states and 3300 transitions. [2021-11-23 17:31:34,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 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 17:31:34,398 INFO L276 IsEmpty]: Start isEmpty. Operand 2305 states and 3300 transitions. [2021-11-23 17:31:34,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:34,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:34,402 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] [2021-11-23 17:31:34,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:34,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:34,615 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:34,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:34,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1473223963, now seen corresponding path program 1 times [2021-11-23 17:31:34,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:34,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2134195392] [2021-11-23 17:31:34,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:34,617 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:34,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:34,619 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:34,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:31:34,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:34,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:34,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:35,827 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:35,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:36,592 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:36,592 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:36,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2134195392] [2021-11-23 17:31:36,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2134195392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:36,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [747402951] [2021-11-23 17:31:36,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:36,593 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:36,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:36,597 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:36,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:31:36,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:36,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:36,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:37,519 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:37,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:38,059 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:38,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [747402951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:38,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192385230] [2021-11-23 17:31:38,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:38,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:38,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:38,066 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:38,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 17:31:38,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:38,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:38,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:38,931 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:38,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:39,513 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:39,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192385230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:39,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:39,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:39,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953320352] [2021-11-23 17:31:39,515 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:39,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:39,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:39,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:39,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:39,518 INFO L87 Difference]: Start difference. First operand 2305 states and 3300 transitions. Second operand has 16 states, 16 states have (on average 8.4375) internal successors, (135), 15 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:39,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:39,830 INFO L93 Difference]: Finished difference Result 3918 states and 5639 transitions. [2021-11-23 17:31:39,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:31:39,831 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.4375) internal successors, (135), 15 states have internal predecessors, (135), 0 states have call successors, (0), 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 17:31:39,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:39,848 INFO L225 Difference]: With dead ends: 3918 [2021-11-23 17:31:39,848 INFO L226 Difference]: Without dead ends: 2332 [2021-11-23 17:31:39,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 448 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 17:31:39,855 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 106 mSDsluCounter, 491 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:39,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 571 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 61 Invalid, 0 Unknown, 56 Unchecked, 0.1s Time] [2021-11-23 17:31:39,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2332 states. [2021-11-23 17:31:40,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2332 to 2331. [2021-11-23 17:31:40,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2331 states, 2330 states have (on average 1.4296137339055794) internal successors, (3331), 2330 states have internal predecessors, (3331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:40,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2331 states to 2331 states and 3331 transitions. [2021-11-23 17:31:40,075 INFO L78 Accepts]: Start accepts. Automaton has 2331 states and 3331 transitions. Word has length 78 [2021-11-23 17:31:40,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:40,076 INFO L470 AbstractCegarLoop]: Abstraction has 2331 states and 3331 transitions. [2021-11-23 17:31:40,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.4375) internal successors, (135), 15 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:40,076 INFO L276 IsEmpty]: Start isEmpty. Operand 2331 states and 3331 transitions. [2021-11-23 17:31:40,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:40,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:40,081 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] [2021-11-23 17:31:40,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:40,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:40,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:40,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:40,695 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:40,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:40,695 INFO L85 PathProgramCache]: Analyzing trace with hash -399378053, now seen corresponding path program 1 times [2021-11-23 17:31:40,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:40,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410856180] [2021-11-23 17:31:40,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:40,696 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:40,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:40,698 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:40,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:31:40,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:40,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:40,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:42,093 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:42,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:42,514 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:42,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:42,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410856180] [2021-11-23 17:31:42,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410856180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:42,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1990855019] [2021-11-23 17:31:42,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:42,515 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:42,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:42,516 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:42,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 17:31:42,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:42,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:42,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:43,834 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:43,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:44,126 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:44,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1990855019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:44,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270598815] [2021-11-23 17:31:44,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:44,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:44,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:44,130 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:44,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 17:31:44,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:44,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:44,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:45,431 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:45,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:45,703 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:45,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270598815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:45,704 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:45,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:45,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946252491] [2021-11-23 17:31:45,704 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:45,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:45,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:45,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:45,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:45,707 INFO L87 Difference]: Start difference. First operand 2331 states and 3331 transitions. Second operand has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:46,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:46,043 INFO L93 Difference]: Finished difference Result 4002 states and 5730 transitions. [2021-11-23 17:31:46,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:31:46,044 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 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 17:31:46,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:46,060 INFO L225 Difference]: With dead ends: 4002 [2021-11-23 17:31:46,060 INFO L226 Difference]: Without dead ends: 2416 [2021-11-23 17:31:46,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 448 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 17:31:46,064 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 155 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:46,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 476 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2021-11-23 17:31:46,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2416 states. [2021-11-23 17:31:46,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2416 to 2341. [2021-11-23 17:31:46,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2341 states, 2340 states have (on average 1.4294871794871795) internal successors, (3345), 2340 states have internal predecessors, (3345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:46,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2341 states to 2341 states and 3345 transitions. [2021-11-23 17:31:46,221 INFO L78 Accepts]: Start accepts. Automaton has 2341 states and 3345 transitions. Word has length 78 [2021-11-23 17:31:46,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:46,222 INFO L470 AbstractCegarLoop]: Abstraction has 2341 states and 3345 transitions. [2021-11-23 17:31:46,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:46,222 INFO L276 IsEmpty]: Start isEmpty. Operand 2341 states and 3345 transitions. [2021-11-23 17:31:46,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:46,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:46,225 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] [2021-11-23 17:31:46,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:46,452 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-11-23 17:31:46,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:46,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:46,842 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:46,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:46,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1993662735, now seen corresponding path program 1 times [2021-11-23 17:31:46,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:46,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1167548095] [2021-11-23 17:31:46,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:46,844 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:46,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:46,845 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:46,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:31:46,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:46,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:46,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:47,088 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 17:31:47,088 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:47,089 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:47,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1167548095] [2021-11-23 17:31:47,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1167548095] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:47,089 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:47,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:47,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252104590] [2021-11-23 17:31:47,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:47,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:47,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:47,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:47,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:47,092 INFO L87 Difference]: Start difference. First operand 2341 states and 3345 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 17:31:47,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:47,243 INFO L93 Difference]: Finished difference Result 4617 states and 6615 transitions. [2021-11-23 17:31:47,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:47,244 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 17:31:47,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:47,257 INFO L225 Difference]: With dead ends: 4617 [2021-11-23 17:31:47,257 INFO L226 Difference]: Without dead ends: 2343 [2021-11-23 17:31:47,260 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 17:31:47,261 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 40 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 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 17:31:47,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 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 17:31:47,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2343 states. [2021-11-23 17:31:47,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2343 to 2341. [2021-11-23 17:31:47,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2341 states, 2340 states have (on average 1.4132478632478633) internal successors, (3307), 2340 states have internal predecessors, (3307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:47,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2341 states to 2341 states and 3307 transitions. [2021-11-23 17:31:47,404 INFO L78 Accepts]: Start accepts. Automaton has 2341 states and 3307 transitions. Word has length 78 [2021-11-23 17:31:47,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:47,405 INFO L470 AbstractCegarLoop]: Abstraction has 2341 states and 3307 transitions. [2021-11-23 17:31:47,405 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 17:31:47,405 INFO L276 IsEmpty]: Start isEmpty. Operand 2341 states and 3307 transitions. [2021-11-23 17:31:47,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:47,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:47,407 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] [2021-11-23 17:31:47,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:47,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:47,619 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:47,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:47,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1119375889, now seen corresponding path program 1 times [2021-11-23 17:31:47,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:47,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1374842673] [2021-11-23 17:31:47,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:47,621 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:47,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:47,622 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:47,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:31:47,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:47,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:47,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:47,835 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 17:31:47,835 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:47,835 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:47,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1374842673] [2021-11-23 17:31:47,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1374842673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:47,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:47,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:47,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678593162] [2021-11-23 17:31:47,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:47,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:47,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:47,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:47,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:47,838 INFO L87 Difference]: Start difference. First operand 2341 states and 3307 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 17:31:47,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:47,933 INFO L93 Difference]: Finished difference Result 3161 states and 4477 transitions. [2021-11-23 17:31:47,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:47,934 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 17:31:47,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:47,939 INFO L225 Difference]: With dead ends: 3161 [2021-11-23 17:31:47,939 INFO L226 Difference]: Without dead ends: 887 [2021-11-23 17:31:47,942 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 17:31:47,943 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 34 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 203 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 17:31:47,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 203 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:47,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2021-11-23 17:31:47,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 879. [2021-11-23 17:31:47,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 879 states, 878 states have (on average 1.3929384965831435) internal successors, (1223), 878 states have internal predecessors, (1223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:47,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 879 states to 879 states and 1223 transitions. [2021-11-23 17:31:47,995 INFO L78 Accepts]: Start accepts. Automaton has 879 states and 1223 transitions. Word has length 78 [2021-11-23 17:31:47,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:47,995 INFO L470 AbstractCegarLoop]: Abstraction has 879 states and 1223 transitions. [2021-11-23 17:31:47,996 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 17:31:47,997 INFO L276 IsEmpty]: Start isEmpty. Operand 879 states and 1223 transitions. [2021-11-23 17:31:47,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:47,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:47,998 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] [2021-11-23 17:31:48,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:48,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:48,210 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:48,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:48,212 INFO L85 PathProgramCache]: Analyzing trace with hash 629218461, now seen corresponding path program 1 times [2021-11-23 17:31:48,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:48,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [577487166] [2021-11-23 17:31:48,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:48,213 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:48,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:48,214 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:48,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:31:48,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:48,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:48,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:48,808 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:31:48,808 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:48,808 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:48,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [577487166] [2021-11-23 17:31:48,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [577487166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:48,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:48,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:48,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248199398] [2021-11-23 17:31:48,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:48,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:48,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:48,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:48,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:48,810 INFO L87 Difference]: Start difference. First operand 879 states and 1223 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 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 17:31:48,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:48,908 INFO L93 Difference]: Finished difference Result 1679 states and 2358 transitions. [2021-11-23 17:31:48,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:48,909 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 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 78 [2021-11-23 17:31:48,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:48,915 INFO L225 Difference]: With dead ends: 1679 [2021-11-23 17:31:48,915 INFO L226 Difference]: Without dead ends: 879 [2021-11-23 17:31:48,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:48,918 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 26 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:48,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 224 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 20 Unchecked, 0.0s Time] [2021-11-23 17:31:48,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879 states. [2021-11-23 17:31:48,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879 to 879. [2021-11-23 17:31:48,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 879 states, 878 states have (on average 1.3917995444191344) internal successors, (1222), 878 states have internal predecessors, (1222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:49,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 879 states to 879 states and 1222 transitions. [2021-11-23 17:31:49,000 INFO L78 Accepts]: Start accepts. Automaton has 879 states and 1222 transitions. Word has length 78 [2021-11-23 17:31:49,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:49,000 INFO L470 AbstractCegarLoop]: Abstraction has 879 states and 1222 transitions. [2021-11-23 17:31:49,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 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 17:31:49,001 INFO L276 IsEmpty]: Start isEmpty. Operand 879 states and 1222 transitions. [2021-11-23 17:31:49,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:49,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:49,004 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] [2021-11-23 17:31:49,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:49,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:49,217 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:49,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:49,218 INFO L85 PathProgramCache]: Analyzing trace with hash -372143203, now seen corresponding path program 1 times [2021-11-23 17:31:49,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:49,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [127998190] [2021-11-23 17:31:49,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:49,218 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:49,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:49,219 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:49,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:31:49,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:49,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:49,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:49,823 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:31:49,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:49,824 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:49,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [127998190] [2021-11-23 17:31:49,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [127998190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:49,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:49,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:49,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194685473] [2021-11-23 17:31:49,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:49,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:49,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:49,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:49,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:49,827 INFO L87 Difference]: Start difference. First operand 879 states and 1222 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 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 17:31:49,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:49,921 INFO L93 Difference]: Finished difference Result 1683 states and 2362 transitions. [2021-11-23 17:31:49,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:49,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 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 78 [2021-11-23 17:31:49,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:49,928 INFO L225 Difference]: With dead ends: 1683 [2021-11-23 17:31:49,928 INFO L226 Difference]: Without dead ends: 879 [2021-11-23 17:31:49,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:49,933 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 33 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:49,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 174 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 15 Unchecked, 0.0s Time] [2021-11-23 17:31:49,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879 states. [2021-11-23 17:31:49,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879 to 879. [2021-11-23 17:31:49,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 879 states, 878 states have (on average 1.3906605922551254) internal successors, (1221), 878 states have internal predecessors, (1221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:49,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 879 states to 879 states and 1221 transitions. [2021-11-23 17:31:49,995 INFO L78 Accepts]: Start accepts. Automaton has 879 states and 1221 transitions. Word has length 78 [2021-11-23 17:31:49,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:49,996 INFO L470 AbstractCegarLoop]: Abstraction has 879 states and 1221 transitions. [2021-11-23 17:31:49,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 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 17:31:49,996 INFO L276 IsEmpty]: Start isEmpty. Operand 879 states and 1221 transitions. [2021-11-23 17:31:49,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:49,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:49,998 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] [2021-11-23 17:31:50,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:50,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:50,216 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:50,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:50,217 INFO L85 PathProgramCache]: Analyzing trace with hash 575830685, now seen corresponding path program 1 times [2021-11-23 17:31:50,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:50,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1660727131] [2021-11-23 17:31:50,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:50,218 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:50,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:50,220 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:50,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:31:50,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:50,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:50,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:50,746 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:31:50,746 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:50,747 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:50,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1660727131] [2021-11-23 17:31:50,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1660727131] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:50,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:50,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:50,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105540076] [2021-11-23 17:31:50,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:50,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:50,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:50,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:50,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:50,751 INFO L87 Difference]: Start difference. First operand 879 states and 1221 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 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 17:31:50,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:50,888 INFO L93 Difference]: Finished difference Result 1687 states and 2366 transitions. [2021-11-23 17:31:50,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:50,889 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 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 78 [2021-11-23 17:31:50,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:50,895 INFO L225 Difference]: With dead ends: 1687 [2021-11-23 17:31:50,895 INFO L226 Difference]: Without dead ends: 879 [2021-11-23 17:31:50,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:50,898 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 26 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:50,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 209 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 12 Unchecked, 0.1s Time] [2021-11-23 17:31:50,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879 states. [2021-11-23 17:31:50,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879 to 879. [2021-11-23 17:31:50,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 879 states, 878 states have (on average 1.3895216400911161) internal successors, (1220), 878 states have internal predecessors, (1220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:50,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 879 states to 879 states and 1220 transitions. [2021-11-23 17:31:50,962 INFO L78 Accepts]: Start accepts. Automaton has 879 states and 1220 transitions. Word has length 78 [2021-11-23 17:31:50,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:50,962 INFO L470 AbstractCegarLoop]: Abstraction has 879 states and 1220 transitions. [2021-11-23 17:31:50,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 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 17:31:50,963 INFO L276 IsEmpty]: Start isEmpty. Operand 879 states and 1220 transitions. [2021-11-23 17:31:50,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:31:50,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:50,964 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] [2021-11-23 17:31:50,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:51,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:51,179 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:51,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:51,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1120135581, now seen corresponding path program 1 times [2021-11-23 17:31:51,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:51,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1355003183] [2021-11-23 17:31:51,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:51,180 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:51,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:51,181 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:51,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:31:51,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:51,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:51,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:51,728 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:31:51,728 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:51,728 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:51,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1355003183] [2021-11-23 17:31:51,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1355003183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:51,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:51,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:51,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112146395] [2021-11-23 17:31:51,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:51,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:51,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:51,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:51,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:51,734 INFO L87 Difference]: Start difference. First operand 879 states and 1220 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 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 17:31:51,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:51,850 INFO L93 Difference]: Finished difference Result 1673 states and 2349 transitions. [2021-11-23 17:31:51,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:51,851 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 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 78 [2021-11-23 17:31:51,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:51,855 INFO L225 Difference]: With dead ends: 1673 [2021-11-23 17:31:51,856 INFO L226 Difference]: Without dead ends: 861 [2021-11-23 17:31:51,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:51,858 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 40 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:51,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 213 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 37 Unchecked, 0.1s Time] [2021-11-23 17:31:51,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2021-11-23 17:31:51,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 861. [2021-11-23 17:31:51,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 860 states have (on average 1.3930232558139535) internal successors, (1198), 860 states have internal predecessors, (1198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:51,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1198 transitions. [2021-11-23 17:31:51,918 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1198 transitions. Word has length 78 [2021-11-23 17:31:51,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:51,919 INFO L470 AbstractCegarLoop]: Abstraction has 861 states and 1198 transitions. [2021-11-23 17:31:51,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 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 17:31:51,919 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1198 transitions. [2021-11-23 17:31:51,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:31:51,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:51,921 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] [2021-11-23 17:31:51,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:52,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:52,135 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:52,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:52,135 INFO L85 PathProgramCache]: Analyzing trace with hash -513037622, now seen corresponding path program 1 times [2021-11-23 17:31:52,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:52,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [242150402] [2021-11-23 17:31:52,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:52,136 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:52,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:52,137 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:52,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:31:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:52,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:52,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:53,489 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:53,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:53,910 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:53,910 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:53,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [242150402] [2021-11-23 17:31:53,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [242150402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:53,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1506051165] [2021-11-23 17:31:53,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:53,911 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:53,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:53,918 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:53,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 17:31:54,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:54,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:54,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:55,219 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:55,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:55,554 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:55,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1506051165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:55,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762445976] [2021-11-23 17:31:55,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:55,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:55,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:55,562 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:55,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 17:31:55,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:55,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:55,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:56,587 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:56,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:56,974 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:56,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762445976] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:56,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:56,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:56,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556801747] [2021-11-23 17:31:56,976 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:56,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:56,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:56,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:56,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:56,980 INFO L87 Difference]: Start difference. First operand 861 states and 1198 transitions. Second operand has 16 states, 16 states have (on average 9.1875) internal successors, (147), 15 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:57,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:57,168 INFO L93 Difference]: Finished difference Result 1669 states and 2351 transitions. [2021-11-23 17:31:57,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:31:57,169 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.1875) internal successors, (147), 15 states have internal predecessors, (147), 0 states have call successors, (0), 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 17:31:57,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:57,176 INFO L225 Difference]: With dead ends: 1669 [2021-11-23 17:31:57,176 INFO L226 Difference]: Without dead ends: 875 [2021-11-23 17:31:57,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:31:57,181 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 116 mSDsluCounter, 601 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 680 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:57,182 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 680 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 81 Unchecked, 0.0s Time] [2021-11-23 17:31:57,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2021-11-23 17:31:57,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 873. [2021-11-23 17:31:57,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 873 states, 872 states have (on average 1.3944954128440368) internal successors, (1216), 872 states have internal predecessors, (1216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:57,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 873 states to 873 states and 1216 transitions. [2021-11-23 17:31:57,251 INFO L78 Accepts]: Start accepts. Automaton has 873 states and 1216 transitions. Word has length 79 [2021-11-23 17:31:57,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:57,251 INFO L470 AbstractCegarLoop]: Abstraction has 873 states and 1216 transitions. [2021-11-23 17:31:57,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.1875) internal successors, (147), 15 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:57,252 INFO L276 IsEmpty]: Start isEmpty. Operand 873 states and 1216 transitions. [2021-11-23 17:31:57,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:31:57,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:57,254 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 17:31:57,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:57,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-23 17:31:57,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:57,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:57,870 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:57,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:57,871 INFO L85 PathProgramCache]: Analyzing trace with hash -175244480, now seen corresponding path program 1 times [2021-11-23 17:31:57,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:57,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [233055890] [2021-11-23 17:31:57,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:57,872 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:57,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:57,873 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:57,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:31:57,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:57,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:57,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:58,106 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 17:31:58,106 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:58,107 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:58,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [233055890] [2021-11-23 17:31:58,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [233055890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:58,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:58,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:58,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133822055] [2021-11-23 17:31:58,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:58,109 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:58,109 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:58,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:58,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:58,110 INFO L87 Difference]: Start difference. First operand 873 states and 1216 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 17:31:58,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:58,153 INFO L93 Difference]: Finished difference Result 1273 states and 1782 transitions. [2021-11-23 17:31:58,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:58,153 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 17:31:58,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:58,157 INFO L225 Difference]: With dead ends: 1273 [2021-11-23 17:31:58,157 INFO L226 Difference]: Without dead ends: 479 [2021-11-23 17:31:58,159 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 17:31:58,160 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 31 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 186 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 17:31:58,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 186 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:58,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-11-23 17:31:58,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 477. [2021-11-23 17:31:58,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 1.3529411764705883) internal successors, (644), 476 states have internal predecessors, (644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:58,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 644 transitions. [2021-11-23 17:31:58,194 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 644 transitions. Word has length 79 [2021-11-23 17:31:58,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:58,195 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 644 transitions. [2021-11-23 17:31:58,195 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 17:31:58,196 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 644 transitions. [2021-11-23 17:31:58,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:31:58,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:58,197 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] [2021-11-23 17:31:58,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:58,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:58,410 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:58,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:58,411 INFO L85 PathProgramCache]: Analyzing trace with hash -45372398, now seen corresponding path program 1 times [2021-11-23 17:31:58,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:58,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [572293384] [2021-11-23 17:31:58,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:58,411 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:58,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:58,414 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:58,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:31:58,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:58,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:58,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:59,529 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:59,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:59,983 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:59,983 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:59,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [572293384] [2021-11-23 17:31:59,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [572293384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:59,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1479916638] [2021-11-23 17:31:59,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:59,984 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:59,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:59,987 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:59,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 17:32:00,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:00,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:32:00,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:01,125 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:01,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:01,490 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:01,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1479916638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:01,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543210398] [2021-11-23 17:32:01,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:01,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:01,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:01,492 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:01,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 17:32:01,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:01,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:32:01,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:02,476 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:02,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:02,786 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:02,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543210398] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:02,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:02,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:32:02,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334597602] [2021-11-23 17:32:02,787 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:02,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:32:02,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:02,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:32:02,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:32:02,789 INFO L87 Difference]: Start difference. First operand 477 states and 644 transitions. Second operand has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:02,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:02,907 INFO L93 Difference]: Finished difference Result 889 states and 1227 transitions. [2021-11-23 17:32:02,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:32:02,908 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 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 17:32:02,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:02,911 INFO L225 Difference]: With dead ends: 889 [2021-11-23 17:32:02,911 INFO L226 Difference]: Without dead ends: 491 [2021-11-23 17:32:02,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:32:02,913 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 110 mSDsluCounter, 660 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 737 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:02,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 737 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 67 Unchecked, 0.0s Time] [2021-11-23 17:32:02,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-11-23 17:32:02,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 489. [2021-11-23 17:32:02,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 1.3565573770491803) internal successors, (662), 488 states have internal predecessors, (662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:02,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 662 transitions. [2021-11-23 17:32:02,944 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 662 transitions. Word has length 80 [2021-11-23 17:32:02,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:02,945 INFO L470 AbstractCegarLoop]: Abstraction has 489 states and 662 transitions. [2021-11-23 17:32:02,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:02,945 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 662 transitions. [2021-11-23 17:32:02,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:32:02,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:02,946 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, 1] [2021-11-23 17:32:02,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:03,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:03,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-23 17:32:03,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:03,549 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:03,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:03,549 INFO L85 PathProgramCache]: Analyzing trace with hash 1172613000, now seen corresponding path program 1 times [2021-11-23 17:32:03,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:03,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [20592888] [2021-11-23 17:32:03,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:03,550 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:03,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:03,551 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:03,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:32:03,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:03,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:32:03,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:03,731 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 17:32:03,731 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:03,731 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:03,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [20592888] [2021-11-23 17:32:03,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [20592888] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:03,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:03,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:32:03,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046192645] [2021-11-23 17:32:03,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:03,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:03,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:03,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:03,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:32:03,733 INFO L87 Difference]: Start difference. First operand 489 states and 662 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:03,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:03,755 INFO L93 Difference]: Finished difference Result 691 states and 943 transitions. [2021-11-23 17:32:03,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:03,769 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 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 17:32:03,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:03,771 INFO L225 Difference]: With dead ends: 691 [2021-11-23 17:32:03,771 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 17:32:03,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 78 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 17:32:03,773 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 26 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 170 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 17:32:03,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 170 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:32:03,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 17:32:03,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 291. [2021-11-23 17:32:03,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.303448275862069) internal successors, (378), 290 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:03,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 378 transitions. [2021-11-23 17:32:03,794 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 378 transitions. Word has length 80 [2021-11-23 17:32:03,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:03,795 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 378 transitions. [2021-11-23 17:32:03,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:03,795 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 378 transitions. [2021-11-23 17:32:03,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:32:03,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:03,796 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 17:32:03,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:04,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:04,008 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:04,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:04,009 INFO L85 PathProgramCache]: Analyzing trace with hash 1105612801, now seen corresponding path program 1 times [2021-11-23 17:32:04,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:04,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [459938036] [2021-11-23 17:32:04,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:04,009 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:04,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:04,010 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:04,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:32:04,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:04,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:32:04,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:04,674 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:32:04,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:04,674 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:04,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [459938036] [2021-11-23 17:32:04,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [459938036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:04,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:04,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:32:04,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462543270] [2021-11-23 17:32:04,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:04,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:32:04,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:04,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:32:04,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:32:04,677 INFO L87 Difference]: Start difference. First operand 291 states and 378 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 17:32:04,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:04,824 INFO L93 Difference]: Finished difference Result 645 states and 863 transitions. [2021-11-23 17:32:04,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:32:04,830 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 81 [2021-11-23 17:32:04,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:04,834 INFO L225 Difference]: With dead ends: 645 [2021-11-23 17:32:04,834 INFO L226 Difference]: Without dead ends: 445 [2021-11-23 17:32:04,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 76 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 17:32:04,837 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 414 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 456 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 17:32:04,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [414 Valid, 456 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:32:04,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2021-11-23 17:32:04,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 291. [2021-11-23 17:32:04,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.282758620689655) internal successors, (372), 290 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:04,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 372 transitions. [2021-11-23 17:32:04,862 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 372 transitions. Word has length 81 [2021-11-23 17:32:04,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:04,862 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 372 transitions. [2021-11-23 17:32:04,863 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 17:32:04,863 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 372 transitions. [2021-11-23 17:32:04,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:32:04,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:04,864 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 17:32:04,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:05,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:05,076 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:05,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:05,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1686995388, now seen corresponding path program 1 times [2021-11-23 17:32:05,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:05,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385585150] [2021-11-23 17:32:05,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:05,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:05,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:05,078 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:05,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:32:05,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:05,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:32:05,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:05,725 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:32:05,725 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:05,725 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:05,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385585150] [2021-11-23 17:32:05,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385585150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:05,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:05,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:32:05,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24162436] [2021-11-23 17:32:05,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:05,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:32:05,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:05,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:32:05,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:32:05,727 INFO L87 Difference]: Start difference. First operand 291 states and 372 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 17:32:05,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:05,905 INFO L93 Difference]: Finished difference Result 579 states and 769 transitions. [2021-11-23 17:32:05,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:32:05,906 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 81 [2021-11-23 17:32:05,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:05,910 INFO L225 Difference]: With dead ends: 579 [2021-11-23 17:32:05,910 INFO L226 Difference]: Without dead ends: 511 [2021-11-23 17:32:05,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 76 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 17:32:05,912 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 373 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:05,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 462 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:32:05,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-23 17:32:05,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 361. [2021-11-23 17:32:05,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 360 states have (on average 1.288888888888889) internal successors, (464), 360 states have internal predecessors, (464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:05,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 464 transitions. [2021-11-23 17:32:05,948 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 464 transitions. Word has length 81 [2021-11-23 17:32:05,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:05,949 INFO L470 AbstractCegarLoop]: Abstraction has 361 states and 464 transitions. [2021-11-23 17:32:05,949 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 17:32:05,949 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 464 transitions. [2021-11-23 17:32:05,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:32:05,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:05,951 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 17:32:05,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:06,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:06,163 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:06,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:06,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1252508129, now seen corresponding path program 1 times [2021-11-23 17:32:06,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:06,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [649895532] [2021-11-23 17:32:06,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:06,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:06,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:06,166 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:06,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:32:06,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:06,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:32:06,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:06,913 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:32:06,913 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:06,913 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:06,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [649895532] [2021-11-23 17:32:06,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [649895532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:06,914 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:06,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:32:06,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978244310] [2021-11-23 17:32:06,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:06,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:32:06,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:06,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:32:06,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:32:06,916 INFO L87 Difference]: Start difference. First operand 361 states and 464 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 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 17:32:07,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:07,100 INFO L93 Difference]: Finished difference Result 649 states and 861 transitions. [2021-11-23 17:32:07,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:32:07,101 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 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 81 [2021-11-23 17:32:07,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:07,118 INFO L225 Difference]: With dead ends: 649 [2021-11-23 17:32:07,119 INFO L226 Difference]: Without dead ends: 581 [2021-11-23 17:32:07,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 76 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 17:32:07,121 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 372 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:07,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [372 Valid, 453 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:32:07,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-11-23 17:32:07,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 437. [2021-11-23 17:32:07,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 436 states have (on average 1.2935779816513762) internal successors, (564), 436 states have internal predecessors, (564), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:07,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 564 transitions. [2021-11-23 17:32:07,157 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 564 transitions. Word has length 81 [2021-11-23 17:32:07,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:07,158 INFO L470 AbstractCegarLoop]: Abstraction has 437 states and 564 transitions. [2021-11-23 17:32:07,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 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 17:32:07,159 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 564 transitions. [2021-11-23 17:32:07,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:32:07,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:07,160 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 17:32:07,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:07,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:07,373 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:07,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:07,374 INFO L85 PathProgramCache]: Analyzing trace with hash 892156004, now seen corresponding path program 1 times [2021-11-23 17:32:07,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:07,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260913870] [2021-11-23 17:32:07,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:07,375 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:07,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:07,376 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:07,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:32:07,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:07,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:32:07,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:08,053 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:08,053 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:08,053 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:08,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [260913870] [2021-11-23 17:32:08,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [260913870] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:08,054 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:08,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:32:08,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903156021] [2021-11-23 17:32:08,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:08,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:32:08,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:08,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:32:08,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:32:08,055 INFO L87 Difference]: Start difference. First operand 437 states and 564 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:08,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:08,156 INFO L93 Difference]: Finished difference Result 725 states and 961 transitions. [2021-11-23 17:32:08,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:32:08,157 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 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 17:32:08,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:08,160 INFO L225 Difference]: With dead ends: 725 [2021-11-23 17:32:08,160 INFO L226 Difference]: Without dead ends: 657 [2021-11-23 17:32:08,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 76 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 17:32:08,161 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 291 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:08,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 455 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:32:08,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2021-11-23 17:32:08,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 513. [2021-11-23 17:32:08,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 1.296875) internal successors, (664), 512 states have internal predecessors, (664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:08,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 664 transitions. [2021-11-23 17:32:08,201 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 664 transitions. Word has length 81 [2021-11-23 17:32:08,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:08,202 INFO L470 AbstractCegarLoop]: Abstraction has 513 states and 664 transitions. [2021-11-23 17:32:08,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:08,202 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 664 transitions. [2021-11-23 17:32:08,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:32:08,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:08,203 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, 1] [2021-11-23 17:32:08,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:08,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:08,415 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:08,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:08,415 INFO L85 PathProgramCache]: Analyzing trace with hash 2039370684, now seen corresponding path program 1 times [2021-11-23 17:32:08,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:08,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [710610010] [2021-11-23 17:32:08,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:08,416 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:08,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:08,417 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:08,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:32:08,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:08,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:32:08,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:13,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:16,168 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:16,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:16,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [710610010] [2021-11-23 17:32:16,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [710610010] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:16,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1560023180] [2021-11-23 17:32:16,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:16,169 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:16,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:16,170 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:16,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 17:32:16,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:16,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:32:16,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:19,952 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:19,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:21,286 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:21,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1560023180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:21,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413085592] [2021-11-23 17:32:21,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:21,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:21,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:21,288 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:21,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 17:32:21,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:21,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:32:21,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:23,735 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:23,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:24,355 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:24,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413085592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:24,356 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:24,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 17, 15, 16, 15] total 73 [2021-11-23 17:32:24,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468234525] [2021-11-23 17:32:24,357 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:24,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-23 17:32:24,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:24,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-23 17:32:24,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=4528, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 17:32:24,364 INFO L87 Difference]: Start difference. First operand 513 states and 664 transitions. Second operand has 73 states, 73 states have (on average 3.671232876712329) internal successors, (268), 73 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:26,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:26,089 INFO L93 Difference]: Finished difference Result 838 states and 1079 transitions. [2021-11-23 17:32:26,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:32:26,090 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.671232876712329) internal successors, (268), 73 states have internal predecessors, (268), 0 states have call successors, (0), 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 17:32:26,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:26,093 INFO L225 Difference]: With dead ends: 838 [2021-11-23 17:32:26,093 INFO L226 Difference]: Without dead ends: 700 [2021-11-23 17:32:26,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 413 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2518 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=861, Invalid=4991, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 17:32:26,098 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 265 mSDsluCounter, 1863 mSDsCounter, 0 mSdLazyCounter, 589 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 1959 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:26,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 1959 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 589 Invalid, 0 Unknown, 116 Unchecked, 0.8s Time] [2021-11-23 17:32:26,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-11-23 17:32:26,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 524. [2021-11-23 17:32:26,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 524 states, 523 states have (on average 1.2944550669216062) internal successors, (677), 523 states have internal predecessors, (677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:26,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 524 states to 524 states and 677 transitions. [2021-11-23 17:32:26,148 INFO L78 Accepts]: Start accepts. Automaton has 524 states and 677 transitions. Word has length 82 [2021-11-23 17:32:26,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:26,148 INFO L470 AbstractCegarLoop]: Abstraction has 524 states and 677 transitions. [2021-11-23 17:32:26,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.671232876712329) internal successors, (268), 73 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:26,149 INFO L276 IsEmpty]: Start isEmpty. Operand 524 states and 677 transitions. [2021-11-23 17:32:26,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:32:26,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:26,151 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, 1] [2021-11-23 17:32:26,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:26,389 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-23 17:32:26,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:26,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:26,765 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:26,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:26,765 INFO L85 PathProgramCache]: Analyzing trace with hash -1325300801, now seen corresponding path program 1 times [2021-11-23 17:32:26,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:26,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1362512022] [2021-11-23 17:32:26,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:26,766 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:26,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:26,767 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:26,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:32:26,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:26,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:26,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:27,976 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:27,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:28,313 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:28,314 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:28,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1362512022] [2021-11-23 17:32:28,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1362512022] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:28,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1297213886] [2021-11-23 17:32:28,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:28,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:28,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:28,315 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:28,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 17:32:28,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:28,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:28,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:30,307 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:30,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:30,831 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:30,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1297213886] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:30,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541932482] [2021-11-23 17:32:30,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:30,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:30,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:30,832 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:30,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 17:32:30,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:30,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:32:30,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:39,747 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:39,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:43,760 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:43,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541932482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:43,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:43,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 28, 24] total 77 [2021-11-23 17:32:43,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257003197] [2021-11-23 17:32:43,761 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:43,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-23 17:32:43,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:43,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-23 17:32:43,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=5275, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 17:32:43,765 INFO L87 Difference]: Start difference. First operand 524 states and 677 transitions. Second operand has 77 states, 77 states have (on average 5.207792207792208) internal successors, (401), 77 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:47,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:47,846 INFO L93 Difference]: Finished difference Result 873 states and 1116 transitions. [2021-11-23 17:32:47,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:32:47,846 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 5.207792207792208) internal successors, (401), 77 states have internal predecessors, (401), 0 states have call successors, (0), 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 17:32:47,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:47,848 INFO L225 Difference]: With dead ends: 873 [2021-11-23 17:32:47,849 INFO L226 Difference]: Without dead ends: 725 [2021-11-23 17:32:47,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 421 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2749 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=1071, Invalid=8631, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 17:32:47,854 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 276 mSDsluCounter, 2275 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 2374 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 281 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:47,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [276 Valid, 2374 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 549 Invalid, 0 Unknown, 281 Unchecked, 0.7s Time] [2021-11-23 17:32:47,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 725 states. [2021-11-23 17:32:47,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 725 to 525. [2021-11-23 17:32:47,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 524 states have (on average 1.2938931297709924) internal successors, (678), 524 states have internal predecessors, (678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:47,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 678 transitions. [2021-11-23 17:32:47,894 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 678 transitions. Word has length 82 [2021-11-23 17:32:47,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:47,895 INFO L470 AbstractCegarLoop]: Abstraction has 525 states and 678 transitions. [2021-11-23 17:32:47,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 5.207792207792208) internal successors, (401), 77 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:47,895 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 678 transitions. [2021-11-23 17:32:47,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:32:47,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:47,897 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, 1] [2021-11-23 17:32:47,935 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-23 17:32:48,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-11-23 17:32:48,324 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Ended with exit code 0 [2021-11-23 17:32:48,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:48,522 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:48,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:48,523 INFO L85 PathProgramCache]: Analyzing trace with hash 388685212, now seen corresponding path program 1 times [2021-11-23 17:32:48,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:48,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1780146817] [2021-11-23 17:32:48,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:48,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:48,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:48,524 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:48,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:32:48,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:48,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:32:48,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:50,764 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:50,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:51,420 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:51,421 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:51,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1780146817] [2021-11-23 17:32:51,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1780146817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:51,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1436572998] [2021-11-23 17:32:51,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:51,421 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:51,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:51,422 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:51,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 17:32:51,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:51,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:51,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:52,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:53,294 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:53,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1436572998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:53,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302241052] [2021-11-23 17:32:53,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:53,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:53,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:53,296 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:53,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 17:32:53,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:53,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:32:53,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:54,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:55,288 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:55,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302241052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:55,289 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:55,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 11, 8, 16, 14] total 42 [2021-11-23 17:32:55,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003159588] [2021-11-23 17:32:55,289 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:55,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 17:32:55,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:55,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 17:32:55,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1471, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 17:32:55,291 INFO L87 Difference]: Start difference. First operand 525 states and 678 transitions. Second operand has 42 states, 42 states have (on average 5.809523809523809) internal successors, (244), 42 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:55,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:55,681 INFO L93 Difference]: Finished difference Result 827 states and 1067 transitions. [2021-11-23 17:32:55,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:32:55,681 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.809523809523809) internal successors, (244), 42 states have internal predecessors, (244), 0 states have call successors, (0), 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 17:32:55,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:55,683 INFO L225 Difference]: With dead ends: 827 [2021-11-23 17:32:55,683 INFO L226 Difference]: Without dead ends: 667 [2021-11-23 17:32:55,684 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 445 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=283, Invalid=1609, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:32:55,685 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 137 mSDsluCounter, 1405 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 1510 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:55,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 1510 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 300 Invalid, 0 Unknown, 51 Unchecked, 0.2s Time] [2021-11-23 17:32:55,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2021-11-23 17:32:55,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 503. [2021-11-23 17:32:55,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 1.292828685258964) internal successors, (649), 502 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 17:32:55,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 649 transitions. [2021-11-23 17:32:55,724 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 649 transitions. Word has length 82 [2021-11-23 17:32:55,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:55,724 INFO L470 AbstractCegarLoop]: Abstraction has 503 states and 649 transitions. [2021-11-23 17:32:55,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.809523809523809) internal successors, (244), 42 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:55,724 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 649 transitions. [2021-11-23 17:32:55,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:32:55,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:55,725 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 17:32:55,751 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-23 17:32:55,933 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Ended with exit code 0 [2021-11-23 17:32:56,127 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2021-11-23 17:32:56,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:56,326 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:56,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:56,327 INFO L85 PathProgramCache]: Analyzing trace with hash 1847365168, now seen corresponding path program 1 times [2021-11-23 17:32:56,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:56,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [401186874] [2021-11-23 17:32:56,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:56,328 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:56,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:56,329 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:56,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:32:56,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:56,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:56,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:56,647 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:56,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:56,848 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:56,848 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:56,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [401186874] [2021-11-23 17:32:56,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [401186874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:56,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1625039498] [2021-11-23 17:32:56,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:56,849 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:56,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:56,850 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:56,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 17:32:56,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:57,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:57,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:57,284 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:57,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:57,478 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:57,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1625039498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:57,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425822383] [2021-11-23 17:32:57,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:57,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:57,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:57,482 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:57,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 17:32:57,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:57,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:57,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:57,832 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:57,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:58,044 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:58,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425822383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:58,044 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:58,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:32:58,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593455231] [2021-11-23 17:32:58,045 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:58,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:32:58,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:58,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:32:58,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:32:58,046 INFO L87 Difference]: Start difference. First operand 503 states and 649 transitions. Second operand has 6 states, 6 states have (on average 26.666666666666668) internal successors, (160), 6 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:58,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:58,132 INFO L93 Difference]: Finished difference Result 1557 states and 2033 transitions. [2021-11-23 17:32:58,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:32:58,132 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 26.666666666666668) internal successors, (160), 6 states have internal predecessors, (160), 0 states have call successors, (0), 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 17:32:58,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:58,135 INFO L225 Difference]: With dead ends: 1557 [2021-11-23 17:32:58,135 INFO L226 Difference]: Without dead ends: 1159 [2021-11-23 17:32:58,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 485 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 17:32:58,137 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 195 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:58,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 397 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 21 Invalid, 0 Unknown, 12 Unchecked, 0.0s Time] [2021-11-23 17:32:58,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1159 states. [2021-11-23 17:32:58,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1159 to 1079. [2021-11-23 17:32:58,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1079 states, 1078 states have (on average 1.2922077922077921) internal successors, (1393), 1078 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 17:32:58,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1079 states to 1079 states and 1393 transitions. [2021-11-23 17:32:58,211 INFO L78 Accepts]: Start accepts. Automaton has 1079 states and 1393 transitions. Word has length 83 [2021-11-23 17:32:58,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:58,211 INFO L470 AbstractCegarLoop]: Abstraction has 1079 states and 1393 transitions. [2021-11-23 17:32:58,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 26.666666666666668) internal successors, (160), 6 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:58,211 INFO L276 IsEmpty]: Start isEmpty. Operand 1079 states and 1393 transitions. [2021-11-23 17:32:58,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:32:58,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:58,212 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, 1] [2021-11-23 17:32:58,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:58,438 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-23 17:32:58,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 17:32:58,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:58,814 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:58,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:58,815 INFO L85 PathProgramCache]: Analyzing trace with hash 287774809, now seen corresponding path program 1 times [2021-11-23 17:32:58,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:58,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1519801436] [2021-11-23 17:32:58,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:58,815 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:58,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:58,816 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:58,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 17:32:58,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:58,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:32:58,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:09,954 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:09,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:18,018 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:18,018 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:18,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1519801436] [2021-11-23 17:33:18,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1519801436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:18,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2084601146] [2021-11-23 17:33:18,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:18,019 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:18,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:18,020 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:18,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 17:33:18,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:18,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:18,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:22,558 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:22,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:24,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2084601146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:24,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252923146] [2021-11-23 17:33:24,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:24,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:24,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:24,333 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:24,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 17:33:24,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:24,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:33:24,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:37,009 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:37,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:40,053 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:40,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252923146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:40,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:40,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 11, 9, 29, 24] total 82 [2021-11-23 17:33:40,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706528021] [2021-11-23 17:33:40,055 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:40,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:33:40,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:40,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:33:40,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=766, Invalid=5876, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:33:40,059 INFO L87 Difference]: Start difference. First operand 1079 states and 1393 transitions. Second operand has 82 states, 82 states have (on average 4.012195121951219) internal successors, (329), 82 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:41,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:41,840 INFO L93 Difference]: Finished difference Result 1390 states and 1795 transitions. [2021-11-23 17:33:41,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:33:41,840 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 4.012195121951219) internal successors, (329), 82 states have internal predecessors, (329), 0 states have call successors, (0), 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 17:33:41,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:41,843 INFO L225 Difference]: With dead ends: 1390 [2021-11-23 17:33:41,844 INFO L226 Difference]: Without dead ends: 1118 [2021-11-23 17:33:41,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 411 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2987 ImplicationChecksByTransitivity, 31.2s TimeCoverageRelationStatistics Valid=835, Invalid=6137, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:33:41,849 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 196 mSDsluCounter, 1596 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 1662 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 151 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:41,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 1662 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 486 Invalid, 0 Unknown, 151 Unchecked, 0.7s Time] [2021-11-23 17:33:41,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1118 states. [2021-11-23 17:33:41,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1118 to 1085. [2021-11-23 17:33:41,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1085 states, 1084 states have (on average 1.2915129151291513) internal successors, (1400), 1084 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:41,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1085 states to 1085 states and 1400 transitions. [2021-11-23 17:33:41,919 INFO L78 Accepts]: Start accepts. Automaton has 1085 states and 1400 transitions. Word has length 83 [2021-11-23 17:33:41,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:41,919 INFO L470 AbstractCegarLoop]: Abstraction has 1085 states and 1400 transitions. [2021-11-23 17:33:41,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 4.012195121951219) internal successors, (329), 82 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:41,919 INFO L276 IsEmpty]: Start isEmpty. Operand 1085 states and 1400 transitions. [2021-11-23 17:33:41,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:33:41,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:41,920 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, 1, 1] [2021-11-23 17:33:41,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:42,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:42,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:42,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:42,521 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:42,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:42,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1122155396, now seen corresponding path program 1 times [2021-11-23 17:33:42,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:42,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1812287647] [2021-11-23 17:33:42,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:42,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:42,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:42,523 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:42,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 17:33:42,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:42,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:33:42,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:45,279 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:45,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:46,228 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:46,228 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:46,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1812287647] [2021-11-23 17:33:46,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1812287647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:46,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1637781248] [2021-11-23 17:33:46,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:46,229 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:46,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:46,230 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:46,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 17:33:46,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:46,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:33:46,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:48,844 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:48,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:49,341 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:49,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1637781248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:49,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742006111] [2021-11-23 17:33:49,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:49,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:49,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:49,343 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:49,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 17:33:49,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:49,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:33:49,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:55,144 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:55,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:57,479 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:57,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742006111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:57,480 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:57,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 23, 21] total 66 [2021-11-23 17:33:57,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774403081] [2021-11-23 17:33:57,481 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:57,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-23 17:33:57,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:57,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-23 17:33:57,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=587, Invalid=3703, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:33:57,485 INFO L87 Difference]: Start difference. First operand 1085 states and 1400 transitions. Second operand has 66 states, 66 states have (on average 4.03030303030303) internal successors, (266), 66 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:59,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:59,787 INFO L93 Difference]: Finished difference Result 1842 states and 2362 transitions. [2021-11-23 17:33:59,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:33:59,788 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 4.03030303030303) internal successors, (266), 66 states have internal predecessors, (266), 0 states have call successors, (0), 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 17:33:59,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:59,791 INFO L225 Difference]: With dead ends: 1842 [2021-11-23 17:33:59,791 INFO L226 Difference]: Without dead ends: 1468 [2021-11-23 17:33:59,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1971 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=837, Invalid=5643, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 17:33:59,795 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 271 mSDsluCounter, 1924 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 2029 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:59,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 2029 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 384 Invalid, 0 Unknown, 125 Unchecked, 0.4s Time] [2021-11-23 17:33:59,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1468 states. [2021-11-23 17:33:59,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1468 to 1090. [2021-11-23 17:33:59,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1090 states, 1089 states have (on average 1.2910927456382002) internal successors, (1406), 1089 states have internal predecessors, (1406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:59,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1406 transitions. [2021-11-23 17:33:59,864 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1406 transitions. Word has length 83 [2021-11-23 17:33:59,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:59,864 INFO L470 AbstractCegarLoop]: Abstraction has 1090 states and 1406 transitions. [2021-11-23 17:33:59,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 4.03030303030303) internal successors, (266), 66 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:59,865 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1406 transitions. [2021-11-23 17:33:59,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:33:59,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:59,865 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, 1, 1] [2021-11-23 17:33:59,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Ended with exit code 0 [2021-11-23 17:34:00,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:00,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:00,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:00,470 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:00,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:00,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1430000515, now seen corresponding path program 1 times [2021-11-23 17:34:00,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:00,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [787347841] [2021-11-23 17:34:00,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:00,472 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:00,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:00,473 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:00,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:34:00,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:00,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:34:00,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:03,376 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:03,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:04,364 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:04,364 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:04,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [787347841] [2021-11-23 17:34:04,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [787347841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:04,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [780622391] [2021-11-23 17:34:04,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:04,365 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:04,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:04,366 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:04,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:34:04,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:04,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:34:04,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:07,019 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:07,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:07,519 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:07,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [780622391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:07,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187810629] [2021-11-23 17:34:07,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:07,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:07,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:07,521 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:07,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:34:07,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:07,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:34:07,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:10,613 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:10,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:12,351 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:12,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187810629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:12,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:12,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 17, 16] total 49 [2021-11-23 17:34:12,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435321658] [2021-11-23 17:34:12,353 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:12,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 17:34:12,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:12,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 17:34:12,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1986, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:34:12,356 INFO L87 Difference]: Start difference. First operand 1090 states and 1406 transitions. Second operand has 49 states, 49 states have (on average 5.142857142857143) internal successors, (252), 49 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:12,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:12,700 INFO L93 Difference]: Finished difference Result 1824 states and 2336 transitions. [2021-11-23 17:34:12,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:34:12,701 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 5.142857142857143) internal successors, (252), 49 states have internal predecessors, (252), 0 states have call successors, (0), 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 17:34:12,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:12,705 INFO L225 Difference]: With dead ends: 1824 [2021-11-23 17:34:12,705 INFO L226 Difference]: Without dead ends: 1450 [2021-11-23 17:34:12,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=425, Invalid=2125, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:34:12,709 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 228 mSDsluCounter, 1549 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 1657 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 155 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:12,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 1657 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 129 Invalid, 0 Unknown, 155 Unchecked, 0.1s Time] [2021-11-23 17:34:12,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1450 states. [2021-11-23 17:34:12,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1450 to 1090. [2021-11-23 17:34:12,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1090 states, 1089 states have (on average 1.2910927456382002) internal successors, (1406), 1089 states have internal predecessors, (1406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:12,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1406 transitions. [2021-11-23 17:34:12,794 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1406 transitions. Word has length 83 [2021-11-23 17:34:12,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:12,795 INFO L470 AbstractCegarLoop]: Abstraction has 1090 states and 1406 transitions. [2021-11-23 17:34:12,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 5.142857142857143) internal successors, (252), 49 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:12,795 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1406 transitions. [2021-11-23 17:34:12,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:34:12,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:12,797 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, 1, 1] [2021-11-23 17:34:12,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-23 17:34:13,026 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-23 17:34:13,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:13,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:13,400 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:13,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:13,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1934670970, now seen corresponding path program 1 times [2021-11-23 17:34:13,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:13,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [849347770] [2021-11-23 17:34:13,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:13,401 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:13,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:13,402 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:13,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:34:13,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:13,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:13,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:14,832 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:14,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:15,227 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:15,227 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:15,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [849347770] [2021-11-23 17:34:15,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [849347770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:15,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1445333197] [2021-11-23 17:34:15,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:15,229 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:15,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:15,231 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:15,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 17:34:15,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:15,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:15,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:17,098 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:17,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:17,623 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:17,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1445333197] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:17,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597958523] [2021-11-23 17:34:17,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:17,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:17,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:17,624 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:17,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 17:34:17,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:17,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:34:17,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:19,514 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:19,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:20,533 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:20,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597958523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:20,533 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:20,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:34:20,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265727473] [2021-11-23 17:34:20,534 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:20,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:34:20,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:20,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:34:20,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:34:20,538 INFO L87 Difference]: Start difference. First operand 1090 states and 1406 transitions. Second operand has 45 states, 45 states have (on average 8.644444444444444) internal successors, (389), 45 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:21,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:21,482 INFO L93 Difference]: Finished difference Result 1409 states and 1830 transitions. [2021-11-23 17:34:21,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:34:21,483 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 8.644444444444444) internal successors, (389), 45 states have internal predecessors, (389), 0 states have call successors, (0), 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 17:34:21,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:21,485 INFO L225 Difference]: With dead ends: 1409 [2021-11-23 17:34:21,485 INFO L226 Difference]: Without dead ends: 1023 [2021-11-23 17:34:21,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 453 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:34:21,487 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 97 mSDsluCounter, 1497 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1577 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:21,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 1577 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 118 Invalid, 0 Unknown, 168 Unchecked, 0.1s Time] [2021-11-23 17:34:21,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2021-11-23 17:34:21,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 1023. [2021-11-23 17:34:21,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1023 states, 1022 states have (on average 1.289628180039139) internal successors, (1318), 1022 states have internal predecessors, (1318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:21,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1023 states to 1023 states and 1318 transitions. [2021-11-23 17:34:21,551 INFO L78 Accepts]: Start accepts. Automaton has 1023 states and 1318 transitions. Word has length 83 [2021-11-23 17:34:21,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:21,552 INFO L470 AbstractCegarLoop]: Abstraction has 1023 states and 1318 transitions. [2021-11-23 17:34:21,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 8.644444444444444) internal successors, (389), 45 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:21,552 INFO L276 IsEmpty]: Start isEmpty. Operand 1023 states and 1318 transitions. [2021-11-23 17:34:21,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:34:21,553 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:21,554 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, 1, 1, 1, 1, 1] [2021-11-23 17:34:21,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 17:34:21,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:21,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-23 17:34:22,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:22,168 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:22,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:22,169 INFO L85 PathProgramCache]: Analyzing trace with hash -556252178, now seen corresponding path program 1 times [2021-11-23 17:34:22,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:22,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1490028852] [2021-11-23 17:34:22,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:22,170 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:22,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:22,171 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:22,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 17:34:22,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:22,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:34:22,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:22,582 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:22,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:22,820 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:22,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:22,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1490028852] [2021-11-23 17:34:22,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1490028852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:22,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [298952954] [2021-11-23 17:34:22,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:22,821 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:22,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:22,822 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:22,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 17:34:22,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:22,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:34:22,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:23,049 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:34:23,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:23,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [298952954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:23,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:34:23,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:34:23,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190518868] [2021-11-23 17:34:23,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:23,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:34:23,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:23,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:34:23,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:23,051 INFO L87 Difference]: Start difference. First operand 1023 states and 1318 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 17:34:23,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:23,145 INFO L93 Difference]: Finished difference Result 1817 states and 2356 transitions. [2021-11-23 17:34:23,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:34:23,146 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 84 [2021-11-23 17:34:23,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:23,149 INFO L225 Difference]: With dead ends: 1817 [2021-11-23 17:34:23,149 INFO L226 Difference]: Without dead ends: 1046 [2021-11-23 17:34:23,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 244 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 17:34:23,152 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 57 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 158 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 17:34:23,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 158 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:34:23,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1046 states. [2021-11-23 17:34:23,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1046 to 934. [2021-11-23 17:34:23,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 934 states, 933 states have (on average 1.285101822079314) internal successors, (1199), 933 states have internal predecessors, (1199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:23,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 934 states to 934 states and 1199 transitions. [2021-11-23 17:34:23,264 INFO L78 Accepts]: Start accepts. Automaton has 934 states and 1199 transitions. Word has length 84 [2021-11-23 17:34:23,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:23,264 INFO L470 AbstractCegarLoop]: Abstraction has 934 states and 1199 transitions. [2021-11-23 17:34:23,264 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 17:34:23,265 INFO L276 IsEmpty]: Start isEmpty. Operand 934 states and 1199 transitions. [2021-11-23 17:34:23,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:34:23,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:23,266 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:23,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:23,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 0 [2021-11-23 17:34:23,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:23,681 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:23,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:23,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1040132846, now seen corresponding path program 1 times [2021-11-23 17:34:23,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:23,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [432582886] [2021-11-23 17:34:23,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:23,682 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:23,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:23,683 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:23,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 17:34:23,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:23,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:23,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:25,434 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:25,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:25,911 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:25,911 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:25,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [432582886] [2021-11-23 17:34:25,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [432582886] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:25,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1325892365] [2021-11-23 17:34:25,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:25,913 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:25,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:25,914 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:25,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-23 17:34:26,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:26,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:26,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:27,491 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:27,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:27,754 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:27,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1325892365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:27,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476389591] [2021-11-23 17:34:27,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:27,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:27,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:27,757 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:27,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-23 17:34:27,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:27,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:34:27,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:30,963 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:30,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:32,073 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:32,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476389591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:32,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:32,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 16, 14] total 42 [2021-11-23 17:34:32,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819116033] [2021-11-23 17:34:32,074 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:32,075 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 17:34:32,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:32,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 17:34:32,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1517, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 17:34:32,077 INFO L87 Difference]: Start difference. First operand 934 states and 1199 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 17:34:32,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:32,388 INFO L93 Difference]: Finished difference Result 1213 states and 1568 transitions. [2021-11-23 17:34:32,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:34:32,388 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 84 [2021-11-23 17:34:32,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:32,390 INFO L225 Difference]: With dead ends: 1213 [2021-11-23 17:34:32,391 INFO L226 Difference]: Without dead ends: 946 [2021-11-23 17:34:32,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 458 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=242, Invalid=1650, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:34:32,392 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 119 mSDsluCounter, 1213 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 1292 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 169 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:32,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 1292 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 104 Invalid, 0 Unknown, 169 Unchecked, 0.1s Time] [2021-11-23 17:34:32,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 946 states. [2021-11-23 17:34:32,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 946 to 935. [2021-11-23 17:34:32,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 935 states, 934 states have (on average 1.284796573875803) internal successors, (1200), 934 states have internal predecessors, (1200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:32,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 935 states to 935 states and 1200 transitions. [2021-11-23 17:34:32,462 INFO L78 Accepts]: Start accepts. Automaton has 935 states and 1200 transitions. Word has length 84 [2021-11-23 17:34:32,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:32,463 INFO L470 AbstractCegarLoop]: Abstraction has 935 states and 1200 transitions. [2021-11-23 17:34:32,463 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 17:34:32,463 INFO L276 IsEmpty]: Start isEmpty. Operand 935 states and 1200 transitions. [2021-11-23 17:34:32,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:34:32,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:32,465 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, 1, 1] [2021-11-23 17:34:32,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:32,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Ended with exit code 0 [2021-11-23 17:34:32,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Ended with exit code 0 [2021-11-23 17:34:33,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:33,078 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:33,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:33,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1422831246, now seen corresponding path program 1 times [2021-11-23 17:34:33,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:33,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1285741580] [2021-11-23 17:34:33,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:33,080 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:33,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:33,081 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:33,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-23 17:34:33,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:33,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:33,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:34,604 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:34,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:34,975 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:34,976 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:34,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1285741580] [2021-11-23 17:34:34,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1285741580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:34,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1293339878] [2021-11-23 17:34:34,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:34,976 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:34,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:34,978 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:34,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-23 17:34:35,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:35,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:35,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:36,563 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:36,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:36,848 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:36,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1293339878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:36,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380237366] [2021-11-23 17:34:36,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:36,849 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:36,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:36,851 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:36,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-23 17:34:36,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:36,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:34:36,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:38,555 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:38,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:39,374 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:39,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380237366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:39,374 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:39,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 30 [2021-11-23 17:34:39,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270448496] [2021-11-23 17:34:39,375 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:39,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:34:39,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:39,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:34:39,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:34:39,376 INFO L87 Difference]: Start difference. First operand 935 states and 1200 transitions. Second operand has 30 states, 30 states have (on average 8.533333333333333) internal successors, (256), 30 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:39,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:39,545 INFO L93 Difference]: Finished difference Result 1214 states and 1569 transitions. [2021-11-23 17:34:39,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:34:39,545 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 8.533333333333333) internal successors, (256), 30 states have internal predecessors, (256), 0 states have call successors, (0), 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 84 [2021-11-23 17:34:39,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:39,547 INFO L225 Difference]: With dead ends: 1214 [2021-11-23 17:34:39,548 INFO L226 Difference]: Without dead ends: 947 [2021-11-23 17:34:39,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 469 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=144, Invalid=848, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:34:39,549 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 105 mSDsluCounter, 1044 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 1129 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 120 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:39,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 1129 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 120 Unchecked, 0.1s Time] [2021-11-23 17:34:39,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 947 states. [2021-11-23 17:34:39,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 947 to 935. [2021-11-23 17:34:39,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 935 states, 934 states have (on average 1.284796573875803) internal successors, (1200), 934 states have internal predecessors, (1200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:39,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 935 states to 935 states and 1200 transitions. [2021-11-23 17:34:39,611 INFO L78 Accepts]: Start accepts. Automaton has 935 states and 1200 transitions. Word has length 84 [2021-11-23 17:34:39,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:39,612 INFO L470 AbstractCegarLoop]: Abstraction has 935 states and 1200 transitions. [2021-11-23 17:34:39,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 8.533333333333333) internal successors, (256), 30 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:39,612 INFO L276 IsEmpty]: Start isEmpty. Operand 935 states and 1200 transitions. [2021-11-23 17:34:39,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:34:39,613 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:39,613 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, 1, 1, 1] [2021-11-23 17:34:39,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:39,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:40,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:40,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:40,214 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:40,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:40,214 INFO L85 PathProgramCache]: Analyzing trace with hash 1462205845, now seen corresponding path program 1 times [2021-11-23 17:34:40,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:40,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2766595] [2021-11-23 17:34:40,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:40,215 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:40,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:40,216 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:40,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 17:34:40,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:40,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:40,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:41,631 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:41,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:41,995 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:41,995 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:41,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2766595] [2021-11-23 17:34:41,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2766595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:41,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2125113451] [2021-11-23 17:34:41,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:41,996 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:41,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:42,002 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:42,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-23 17:34:42,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:42,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:34:42,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:52,757 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:52,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:57,189 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:57,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2125113451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:57,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917018711] [2021-11-23 17:34:57,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:57,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:57,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:57,191 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:57,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-23 17:34:57,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:02,347 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:02,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:03,593 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:03,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917018711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:03,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:03,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 32, 26, 31, 26] total 71 [2021-11-23 17:35:03,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988661791] [2021-11-23 17:35:03,594 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:03,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:35:03,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:03,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:35:03,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=4404, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:35:03,597 INFO L87 Difference]: Start difference. First operand 935 states and 1200 transitions. Second operand has 71 states, 71 states have (on average 4.098591549295775) internal successors, (291), 71 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:11,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:11,873 INFO L93 Difference]: Finished difference Result 1185 states and 1522 transitions. [2021-11-23 17:35:11,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 17:35:11,874 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 4.098591549295775) internal successors, (291), 71 states have internal predecessors, (291), 0 states have call successors, (0), 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 84 [2021-11-23 17:35:11,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:11,877 INFO L225 Difference]: With dead ends: 1185 [2021-11-23 17:35:11,877 INFO L226 Difference]: Without dead ends: 866 [2021-11-23 17:35:11,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2117 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=892, Invalid=6939, Unknown=1, NotChecked=0, Total=7832 [2021-11-23 17:35:11,880 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 229 mSDsluCounter, 1606 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 1687 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 246 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:11,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 1687 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 422 Invalid, 0 Unknown, 246 Unchecked, 0.6s Time] [2021-11-23 17:35:11,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 866 states. [2021-11-23 17:35:11,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 866 to 827. [2021-11-23 17:35:11,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 826 states have (on average 1.2832929782082325) internal successors, (1060), 826 states have internal predecessors, (1060), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:11,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1060 transitions. [2021-11-23 17:35:11,960 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1060 transitions. Word has length 84 [2021-11-23 17:35:11,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:11,961 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1060 transitions. [2021-11-23 17:35:11,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 4.098591549295775) internal successors, (291), 71 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:11,962 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1060 transitions. [2021-11-23 17:35:11,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:35:11,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:11,963 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, 1, 1, 1] [2021-11-23 17:35:11,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:12,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:12,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2021-11-23 17:35:12,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:12,579 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:12,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:12,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1765654297, now seen corresponding path program 1 times [2021-11-23 17:35:12,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:12,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1662791390] [2021-11-23 17:35:12,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:12,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:12,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:12,586 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:12,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-23 17:35:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:12,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:35:12,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:15,284 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:15,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:16,196 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:16,196 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:16,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1662791390] [2021-11-23 17:35:16,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1662791390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:16,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [739088171] [2021-11-23 17:35:16,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:16,197 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:16,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:16,198 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:16,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-23 17:35:16,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:16,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:16,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:18,102 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:18,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:18,538 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:18,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [739088171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:18,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197645604] [2021-11-23 17:35:18,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:18,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:18,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:18,540 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:18,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-23 17:35:18,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:18,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:35:18,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:28,776 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:28,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:32,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197645604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:32,095 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:32,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 11, 9, 27, 22] total 82 [2021-11-23 17:35:32,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695469734] [2021-11-23 17:35:32,096 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:32,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:35:32,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:32,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:35:32,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=778, Invalid=5864, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:35:32,099 INFO L87 Difference]: Start difference. First operand 827 states and 1060 transitions. Second operand has 82 states, 82 states have (on average 4.597560975609756) internal successors, (377), 82 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:32,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:32,685 INFO L93 Difference]: Finished difference Result 1032 states and 1331 transitions. [2021-11-23 17:35:32,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 17:35:32,685 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 4.597560975609756) internal successors, (377), 82 states have internal predecessors, (377), 0 states have call successors, (0), 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 85 [2021-11-23 17:35:32,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:32,687 INFO L225 Difference]: With dead ends: 1032 [2021-11-23 17:35:32,687 INFO L226 Difference]: Without dead ends: 765 [2021-11-23 17:35:32,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3328 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=810, Invalid=5996, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:35:32,689 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 255 mSDsluCounter, 2001 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 2091 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 334 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:32,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 2091 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 304 Invalid, 0 Unknown, 334 Unchecked, 0.4s Time] [2021-11-23 17:35:32,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 765 states. [2021-11-23 17:35:32,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 765 to 747. [2021-11-23 17:35:32,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 746 states have (on average 1.2801608579088473) internal successors, (955), 746 states have internal predecessors, (955), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:32,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 955 transitions. [2021-11-23 17:35:32,758 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 955 transitions. Word has length 85 [2021-11-23 17:35:32,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:32,759 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 955 transitions. [2021-11-23 17:35:32,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 4.597560975609756) internal successors, (377), 82 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:32,759 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 955 transitions. [2021-11-23 17:35:32,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:35:32,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:32,761 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:35:32,788 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-23 17:35:32,975 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Ended with exit code 0 [2021-11-23 17:35:33,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:33,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:33,367 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:33,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:33,367 INFO L85 PathProgramCache]: Analyzing trace with hash -923798007, now seen corresponding path program 1 times [2021-11-23 17:35:33,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:33,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [729808122] [2021-11-23 17:35:33,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:33,368 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:33,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:33,372 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:33,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-23 17:35:33,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:33,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:33,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:35,706 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:35,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:36,474 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:36,475 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:36,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [729808122] [2021-11-23 17:35:36,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [729808122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:36,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [397921184] [2021-11-23 17:35:36,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:36,476 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:36,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:36,490 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:36,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-23 17:35:36,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:36,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:36,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:38,646 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:38,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:39,179 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:39,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [397921184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:39,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221883204] [2021-11-23 17:35:39,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:39,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:39,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:39,180 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:39,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-23 17:35:39,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:39,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:39,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:40,925 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:35:40,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:41,877 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:35:41,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221883204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:41,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:41,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:35:41,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424377800] [2021-11-23 17:35:41,878 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:41,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:35:41,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:41,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:35:41,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:35:41,879 INFO L87 Difference]: Start difference. First operand 747 states and 955 transitions. Second operand has 34 states, 34 states have (on average 12.058823529411764) internal successors, (410), 33 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:42,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:42,460 INFO L93 Difference]: Finished difference Result 1387 states and 1785 transitions. [2021-11-23 17:35:42,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:35:42,461 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.058823529411764) internal successors, (410), 33 states have internal predecessors, (410), 0 states have call successors, (0), 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 17:35:42,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:42,463 INFO L225 Difference]: With dead ends: 1387 [2021-11-23 17:35:42,463 INFO L226 Difference]: Without dead ends: 785 [2021-11-23 17:35:42,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 769 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=254, Invalid=1638, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:35:42,464 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 195 mSDsluCounter, 1338 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 1429 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:42,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1429 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 114 Unchecked, 0.0s Time] [2021-11-23 17:35:42,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 785 states. [2021-11-23 17:35:42,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 785 to 785. [2021-11-23 17:35:42,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 785 states, 784 states have (on average 1.2716836734693877) internal successors, (997), 784 states have internal predecessors, (997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:42,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 997 transitions. [2021-11-23 17:35:42,523 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 997 transitions. Word has length 134 [2021-11-23 17:35:42,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:42,524 INFO L470 AbstractCegarLoop]: Abstraction has 785 states and 997 transitions. [2021-11-23 17:35:42,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.058823529411764) internal successors, (410), 33 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:42,525 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 997 transitions. [2021-11-23 17:35:42,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:35:42,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:42,527 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:35:42,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:42,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Ended with exit code 0 [2021-11-23 17:35:42,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Ended with exit code 0 [2021-11-23 17:35:43,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:43,154 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:43,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:43,155 INFO L85 PathProgramCache]: Analyzing trace with hash -903038359, now seen corresponding path program 1 times [2021-11-23 17:35:43,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:43,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1638797683] [2021-11-23 17:35:43,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:43,156 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:43,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:43,157 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:43,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:35:43,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:43,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:43,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:45,585 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:45,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:46,444 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:46,445 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:46,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1638797683] [2021-11-23 17:35:46,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1638797683] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:46,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [514970490] [2021-11-23 17:35:46,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:46,445 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:46,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:46,446 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:46,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:35:46,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:46,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:46,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:48,629 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:48,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:49,225 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:49,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [514970490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:49,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186517861] [2021-11-23 17:35:49,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:49,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:49,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:49,227 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:49,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:35:49,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:49,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:49,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:51,462 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 73 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:35:51,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:52,186 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 73 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:35:52,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186517861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:52,187 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:52,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:35:52,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85719627] [2021-11-23 17:35:52,188 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:52,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:35:52,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:52,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:35:52,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:35:52,191 INFO L87 Difference]: Start difference. First operand 785 states and 997 transitions. Second operand has 34 states, 34 states have (on average 12.382352941176471) internal successors, (421), 33 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:52,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:52,954 INFO L93 Difference]: Finished difference Result 1485 states and 1895 transitions. [2021-11-23 17:35:52,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:35:52,954 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.382352941176471) internal successors, (421), 33 states have internal predecessors, (421), 0 states have call successors, (0), 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 17:35:52,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:52,956 INFO L225 Difference]: With dead ends: 1485 [2021-11-23 17:35:52,956 INFO L226 Difference]: Without dead ends: 889 [2021-11-23 17:35:52,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 768 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=276, Invalid=1704, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:35:52,959 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 245 mSDsluCounter, 1403 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 1498 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:52,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 1498 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 69 Invalid, 0 Unknown, 161 Unchecked, 0.1s Time] [2021-11-23 17:35:52,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 889 states. [2021-11-23 17:35:53,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 889 to 889. [2021-11-23 17:35:53,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 889 states, 888 states have (on average 1.2556306306306306) internal successors, (1115), 888 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 17:35:53,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 889 states to 889 states and 1115 transitions. [2021-11-23 17:35:53,021 INFO L78 Accepts]: Start accepts. Automaton has 889 states and 1115 transitions. Word has length 134 [2021-11-23 17:35:53,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:53,022 INFO L470 AbstractCegarLoop]: Abstraction has 889 states and 1115 transitions. [2021-11-23 17:35:53,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.382352941176471) internal successors, (421), 33 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:53,022 INFO L276 IsEmpty]: Start isEmpty. Operand 889 states and 1115 transitions. [2021-11-23 17:35:53,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:35:53,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:53,023 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:53,056 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:35:53,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 17:35:53,443 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Ended with exit code 0 [2021-11-23 17:35:53,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:53,642 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:53,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:53,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1793371589, now seen corresponding path program 1 times [2021-11-23 17:35:53,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:53,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2049047991] [2021-11-23 17:35:53,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:53,644 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:53,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:53,645 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:53,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:35:53,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:53,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:53,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:56,406 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:56,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:57,021 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:57,021 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:57,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2049047991] [2021-11-23 17:35:57,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2049047991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:57,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [416501443] [2021-11-23 17:35:57,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:57,022 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:57,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:57,023 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:57,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:35:57,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:57,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:57,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:59,659 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:59,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:00,038 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:00,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [416501443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:00,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657849034] [2021-11-23 17:36:00,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:00,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:00,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:00,040 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:00,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:36:00,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:00,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:00,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:02,269 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:36:02,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:03,100 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:36:03,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657849034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:03,100 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:03,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:36:03,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643656536] [2021-11-23 17:36:03,101 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:03,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:36:03,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:03,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:36:03,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:36:03,103 INFO L87 Difference]: Start difference. First operand 889 states and 1115 transitions. Second operand has 34 states, 34 states have (on average 12.823529411764707) internal successors, (436), 33 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:03,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:03,662 INFO L93 Difference]: Finished difference Result 1893 states and 2365 transitions. [2021-11-23 17:36:03,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:36:03,662 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.823529411764707) internal successors, (436), 33 states have internal predecessors, (436), 0 states have call successors, (0), 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 17:36:03,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:03,664 INFO L225 Difference]: With dead ends: 1893 [2021-11-23 17:36:03,665 INFO L226 Difference]: Without dead ends: 1309 [2021-11-23 17:36:03,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 769 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=243, Invalid=1649, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:03,666 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 184 mSDsluCounter, 1709 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 1807 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:03,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 1807 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 168 Unchecked, 0.0s Time] [2021-11-23 17:36:03,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1309 states. [2021-11-23 17:36:03,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1309 to 1105. [2021-11-23 17:36:03,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1105 states, 1104 states have (on average 1.2346014492753623) internal successors, (1363), 1104 states have internal predecessors, (1363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:03,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1105 states to 1105 states and 1363 transitions. [2021-11-23 17:36:03,783 INFO L78 Accepts]: Start accepts. Automaton has 1105 states and 1363 transitions. Word has length 134 [2021-11-23 17:36:03,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:03,783 INFO L470 AbstractCegarLoop]: Abstraction has 1105 states and 1363 transitions. [2021-11-23 17:36:03,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.823529411764707) internal successors, (436), 33 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:03,784 INFO L276 IsEmpty]: Start isEmpty. Operand 1105 states and 1363 transitions. [2021-11-23 17:36:03,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:36:03,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:03,787 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:03,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:04,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:04,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:04,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:04,401 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:04,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:04,402 INFO L85 PathProgramCache]: Analyzing trace with hash -264266485, now seen corresponding path program 1 times [2021-11-23 17:36:04,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:04,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [914300526] [2021-11-23 17:36:04,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:04,403 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:04,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:04,404 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:04,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:36:04,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:04,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:04,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:36:06,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:07,056 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:36:07,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:07,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [914300526] [2021-11-23 17:36:07,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [914300526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:07,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [945341638] [2021-11-23 17:36:07,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:07,057 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:07,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:07,058 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:07,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:36:07,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:07,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:07,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:10,124 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:10,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:11,052 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:11,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [945341638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:11,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058028533] [2021-11-23 17:36:11,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:11,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:11,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:11,054 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:11,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:36:11,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:11,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:11,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:13,666 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:36:13,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:14,407 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:36:14,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058028533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:14,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:14,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:36:14,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719803131] [2021-11-23 17:36:14,408 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:14,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:36:14,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:14,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:36:14,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:36:14,410 INFO L87 Difference]: Start difference. First operand 1105 states and 1363 transitions. Second operand has 48 states, 48 states have (on average 12.5625) internal successors, (603), 47 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:16,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:16,093 INFO L93 Difference]: Finished difference Result 1978 states and 2488 transitions. [2021-11-23 17:36:16,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:36:16,094 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.5625) internal successors, (603), 47 states have internal predecessors, (603), 0 states have call successors, (0), 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 17:36:16,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:16,098 INFO L225 Difference]: With dead ends: 1978 [2021-11-23 17:36:16,099 INFO L226 Difference]: Without dead ends: 1333 [2021-11-23 17:36:16,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 826 GetRequests, 758 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=441, Invalid=3981, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:36:16,102 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 343 mSDsluCounter, 2607 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 2705 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 270 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:16,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 2705 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 81 Invalid, 0 Unknown, 270 Unchecked, 0.1s Time] [2021-11-23 17:36:16,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1333 states. [2021-11-23 17:36:16,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1333 to 1329. [2021-11-23 17:36:16,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1329 states, 1328 states have (on average 1.2311746987951808) internal successors, (1635), 1328 states have internal predecessors, (1635), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:16,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1329 states to 1329 states and 1635 transitions. [2021-11-23 17:36:16,270 INFO L78 Accepts]: Start accepts. Automaton has 1329 states and 1635 transitions. Word has length 134 [2021-11-23 17:36:16,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:16,270 INFO L470 AbstractCegarLoop]: Abstraction has 1329 states and 1635 transitions. [2021-11-23 17:36:16,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.5625) internal successors, (603), 47 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:16,271 INFO L276 IsEmpty]: Start isEmpty. Operand 1329 states and 1635 transitions. [2021-11-23 17:36:16,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:36:16,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:16,274 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:16,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:16,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:16,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:16,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:16,889 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:16,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:16,890 INFO L85 PathProgramCache]: Analyzing trace with hash -500151285, now seen corresponding path program 1 times [2021-11-23 17:36:16,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:16,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [329344264] [2021-11-23 17:36:16,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:16,891 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:16,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:16,892 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:16,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:36:16,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:17,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:17,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:18,811 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:36:18,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:19,419 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:36:19,419 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:19,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [329344264] [2021-11-23 17:36:19,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [329344264] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:19,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1792216048] [2021-11-23 17:36:19,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:19,420 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:19,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:19,421 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:19,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2021-11-23 17:36:19,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:19,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:19,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:22,629 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:22,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:23,550 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:23,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1792216048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:23,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629011453] [2021-11-23 17:36:23,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:23,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:23,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:23,551 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:23,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-23 17:36:23,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:23,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:23,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:25,615 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:25,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:26,591 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:26,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629011453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:26,591 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:26,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:36:26,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111561004] [2021-11-23 17:36:26,592 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:26,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:36:26,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:26,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:36:26,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:36:26,594 INFO L87 Difference]: Start difference. First operand 1329 states and 1635 transitions. Second operand has 48 states, 48 states have (on average 12.395833333333334) internal successors, (595), 47 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:27,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:27,956 INFO L93 Difference]: Finished difference Result 2511 states and 3119 transitions. [2021-11-23 17:36:27,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:36:27,956 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.395833333333334) internal successors, (595), 47 states have internal predecessors, (595), 0 states have call successors, (0), 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 17:36:27,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:27,961 INFO L225 Difference]: With dead ends: 2511 [2021-11-23 17:36:27,961 INFO L226 Difference]: Without dead ends: 1862 [2021-11-23 17:36:27,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 824 GetRequests, 758 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=388, Invalid=3772, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:36:27,964 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 259 mSDsluCounter, 2785 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 2882 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 316 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:27,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 2882 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 316 Unchecked, 0.1s Time] [2021-11-23 17:36:27,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1862 states. [2021-11-23 17:36:28,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1862 to 1840. [2021-11-23 17:36:28,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1840 states, 1839 states have (on average 1.2185970636215335) internal successors, (2241), 1839 states have internal predecessors, (2241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:28,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1840 states to 1840 states and 2241 transitions. [2021-11-23 17:36:28,172 INFO L78 Accepts]: Start accepts. Automaton has 1840 states and 2241 transitions. Word has length 134 [2021-11-23 17:36:28,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:28,173 INFO L470 AbstractCegarLoop]: Abstraction has 1840 states and 2241 transitions. [2021-11-23 17:36:28,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.395833333333334) internal successors, (595), 47 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:28,174 INFO L276 IsEmpty]: Start isEmpty. Operand 1840 states and 2241 transitions. [2021-11-23 17:36:28,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:36:28,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:28,178 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:28,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:28,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:28,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-23 17:36:28,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:28,793 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:28,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:28,793 INFO L85 PathProgramCache]: Analyzing trace with hash -30311669, now seen corresponding path program 1 times [2021-11-23 17:36:28,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:28,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1343671303] [2021-11-23 17:36:28,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:28,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:28,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:28,795 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:28,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2021-11-23 17:36:28,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:28,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:28,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:36:30,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:31,273 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:36:31,273 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:31,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1343671303] [2021-11-23 17:36:31,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1343671303] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:31,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [786966492] [2021-11-23 17:36:31,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:31,273 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:31,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:31,274 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:31,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2021-11-23 17:36:31,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:31,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:31,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:33,892 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:33,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:34,735 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:34,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [786966492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:34,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327218471] [2021-11-23 17:36:34,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:34,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:34,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:34,736 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:34,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 17:36:34,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:34,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:34,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:36,814 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:36,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:37,784 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:37,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327218471] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:37,785 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:37,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:36:37,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538860223] [2021-11-23 17:36:37,785 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:37,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:36:37,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:37,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:36:37,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:36:37,787 INFO L87 Difference]: Start difference. First operand 1840 states and 2241 transitions. Second operand has 50 states, 50 states have (on average 11.96) internal successors, (598), 49 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:39,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:39,368 INFO L93 Difference]: Finished difference Result 2493 states and 3096 transitions. [2021-11-23 17:36:39,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:36:39,369 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 11.96) internal successors, (598), 49 states have internal predecessors, (598), 0 states have call successors, (0), 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 17:36:39,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:39,374 INFO L225 Difference]: With dead ends: 2493 [2021-11-23 17:36:39,374 INFO L226 Difference]: Without dead ends: 1840 [2021-11-23 17:36:39,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 757 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=415, Invalid=4007, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:36:39,378 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 190 mSDsluCounter, 1920 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 1998 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 179 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:39,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 1998 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 152 Invalid, 0 Unknown, 179 Unchecked, 0.1s Time] [2021-11-23 17:36:39,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1840 states. [2021-11-23 17:36:39,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1840 to 1840. [2021-11-23 17:36:39,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1840 states, 1839 states have (on average 1.2164219684611202) internal successors, (2237), 1839 states have internal predecessors, (2237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:39,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1840 states to 1840 states and 2237 transitions. [2021-11-23 17:36:39,609 INFO L78 Accepts]: Start accepts. Automaton has 1840 states and 2237 transitions. Word has length 134 [2021-11-23 17:36:39,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:39,610 INFO L470 AbstractCegarLoop]: Abstraction has 1840 states and 2237 transitions. [2021-11-23 17:36:39,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 11.96) internal successors, (598), 49 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:39,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1840 states and 2237 transitions. [2021-11-23 17:36:39,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 17:36:39,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:39,614 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:39,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:39,843 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Ended with exit code 0 [2021-11-23 17:36:40,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:40,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:40,242 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:40,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:40,243 INFO L85 PathProgramCache]: Analyzing trace with hash -939316725, now seen corresponding path program 1 times [2021-11-23 17:36:40,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:40,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [86742964] [2021-11-23 17:36:40,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:40,243 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:40,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:40,244 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:40,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 17:36:40,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:40,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:40,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:41,760 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:36:41,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:42,478 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:36:42,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:42,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [86742964] [2021-11-23 17:36:42,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [86742964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:42,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1361930254] [2021-11-23 17:36:42,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:42,479 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:42,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:42,480 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:42,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 17:36:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:42,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:42,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:44,463 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:44,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:45,147 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:45,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1361930254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:45,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931867887] [2021-11-23 17:36:45,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:45,147 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:45,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:45,148 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:45,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 17:36:45,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:45,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:45,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:46,885 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:46,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:47,844 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:47,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931867887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:47,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:47,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:36:47,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141300274] [2021-11-23 17:36:47,845 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:47,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:36:47,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:47,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:36:47,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:36:47,848 INFO L87 Difference]: Start difference. First operand 1840 states and 2237 transitions. Second operand has 39 states, 39 states have (on average 13.307692307692308) internal successors, (519), 38 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:49,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:49,051 INFO L93 Difference]: Finished difference Result 2600 states and 3219 transitions. [2021-11-23 17:36:49,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:36:49,051 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 13.307692307692308) internal successors, (519), 38 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2021-11-23 17:36:49,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:49,055 INFO L225 Difference]: With dead ends: 2600 [2021-11-23 17:36:49,055 INFO L226 Difference]: Without dead ends: 1943 [2021-11-23 17:36:49,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 765 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=361, Invalid=2609, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:36:49,057 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 258 mSDsluCounter, 1461 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 1541 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:49,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 1541 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 102 Invalid, 0 Unknown, 233 Unchecked, 0.1s Time] [2021-11-23 17:36:49,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1943 states. [2021-11-23 17:36:49,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1943 to 1938. [2021-11-23 17:36:49,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1938 states, 1937 states have (on average 1.2075374290139391) internal successors, (2339), 1937 states have internal predecessors, (2339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:49,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1938 states to 1938 states and 2339 transitions. [2021-11-23 17:36:49,293 INFO L78 Accepts]: Start accepts. Automaton has 1938 states and 2339 transitions. Word has length 134 [2021-11-23 17:36:49,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:49,294 INFO L470 AbstractCegarLoop]: Abstraction has 1938 states and 2339 transitions. [2021-11-23 17:36:49,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 13.307692307692308) internal successors, (519), 38 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:49,294 INFO L276 IsEmpty]: Start isEmpty. Operand 1938 states and 2339 transitions. [2021-11-23 17:36:49,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:36:49,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:49,298 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:36:49,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:49,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Ended with exit code 0 [2021-11-23 17:36:49,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:49,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:49,901 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:49,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:49,902 INFO L85 PathProgramCache]: Analyzing trace with hash -720667586, now seen corresponding path program 1 times [2021-11-23 17:36:49,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:49,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1304650806] [2021-11-23 17:36:49,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:49,902 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:49,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:49,903 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:49,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 17:36:50,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:50,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:50,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:52,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:53,335 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:53,335 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:53,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1304650806] [2021-11-23 17:36:53,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1304650806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:53,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1439629237] [2021-11-23 17:36:53,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:53,336 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:53,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:53,337 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:53,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2021-11-23 17:36:53,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:53,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:53,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:55,903 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:55,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:56,340 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:56,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1439629237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:56,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75505506] [2021-11-23 17:36:56,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:56,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:56,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:56,342 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:56,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 17:36:56,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:56,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:56,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:58,561 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:36:58,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:59,449 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:36:59,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75505506] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:59,450 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:59,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:36:59,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187683982] [2021-11-23 17:36:59,451 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:59,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:36:59,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:59,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:36:59,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:36:59,454 INFO L87 Difference]: Start difference. First operand 1938 states and 2339 transitions. Second operand has 34 states, 34 states have (on average 13.117647058823529) internal successors, (446), 33 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:00,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:00,106 INFO L93 Difference]: Finished difference Result 2849 states and 3486 transitions. [2021-11-23 17:37:00,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:37:00,107 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.117647058823529) internal successors, (446), 33 states have internal predecessors, (446), 0 states have call successors, (0), 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 17:37:00,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:00,111 INFO L225 Difference]: With dead ends: 2849 [2021-11-23 17:37:00,111 INFO L226 Difference]: Without dead ends: 2236 [2021-11-23 17:37:00,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=247, Invalid=1645, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:37:00,114 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 174 mSDsluCounter, 1840 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 1941 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 159 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:00,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 1941 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 159 Unchecked, 0.0s Time] [2021-11-23 17:37:00,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2236 states. [2021-11-23 17:37:00,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2236 to 2236. [2021-11-23 17:37:00,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2236 states, 2235 states have (on average 1.2031319910514542) internal successors, (2689), 2235 states have internal predecessors, (2689), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:00,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2236 states to 2236 states and 2689 transitions. [2021-11-23 17:37:00,387 INFO L78 Accepts]: Start accepts. Automaton has 2236 states and 2689 transitions. Word has length 135 [2021-11-23 17:37:00,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:00,387 INFO L470 AbstractCegarLoop]: Abstraction has 2236 states and 2689 transitions. [2021-11-23 17:37:00,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.117647058823529) internal successors, (446), 33 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:00,388 INFO L276 IsEmpty]: Start isEmpty. Operand 2236 states and 2689 transitions. [2021-11-23 17:37:00,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:00,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:00,393 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:00,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:00,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:00,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:01,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:01,018 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:01,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:01,019 INFO L85 PathProgramCache]: Analyzing trace with hash 687763105, now seen corresponding path program 1 times [2021-11-23 17:37:01,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:01,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [887267596] [2021-11-23 17:37:01,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:01,019 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:01,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:01,020 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:01,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 17:37:01,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:01,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:01,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:03,732 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:03,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:04,355 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:04,355 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:04,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [887267596] [2021-11-23 17:37:04,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [887267596] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:04,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1192628507] [2021-11-23 17:37:04,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:04,356 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:04,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:04,357 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:04,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2021-11-23 17:37:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:04,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:04,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:06,863 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:06,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:07,257 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:07,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1192628507] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:07,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475491112] [2021-11-23 17:37:07,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:07,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:07,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:07,260 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:07,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-23 17:37:07,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:07,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:07,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:09,465 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:37:09,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:10,266 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:37:10,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475491112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:10,266 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:10,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:37:10,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633552779] [2021-11-23 17:37:10,267 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:10,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:37:10,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:10,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:37:10,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:37:10,269 INFO L87 Difference]: Start difference. First operand 2236 states and 2689 transitions. Second operand has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:11,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:11,009 INFO L93 Difference]: Finished difference Result 2998 states and 3647 transitions. [2021-11-23 17:37:11,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:37:11,010 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 0 states have call successors, (0), 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 17:37:11,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:11,013 INFO L225 Difference]: With dead ends: 2998 [2021-11-23 17:37:11,014 INFO L226 Difference]: Without dead ends: 2302 [2021-11-23 17:37:11,015 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:37:11,016 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 225 mSDsluCounter, 1527 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 1625 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:11,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 1625 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 52 Invalid, 0 Unknown, 142 Unchecked, 0.0s Time] [2021-11-23 17:37:11,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2302 states. [2021-11-23 17:37:11,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2302 to 2241. [2021-11-23 17:37:11,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2241 states, 2240 states have (on average 1.2035714285714285) internal successors, (2696), 2240 states have internal predecessors, (2696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:11,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2241 states to 2241 states and 2696 transitions. [2021-11-23 17:37:11,229 INFO L78 Accepts]: Start accepts. Automaton has 2241 states and 2696 transitions. Word has length 135 [2021-11-23 17:37:11,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:11,229 INFO L470 AbstractCegarLoop]: Abstraction has 2241 states and 2696 transitions. [2021-11-23 17:37:11,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:11,230 INFO L276 IsEmpty]: Start isEmpty. Operand 2241 states and 2696 transitions. [2021-11-23 17:37:11,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:11,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:11,235 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:11,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:11,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:11,663 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2021-11-23 17:37:11,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:11,838 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:11,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:11,838 INFO L85 PathProgramCache]: Analyzing trace with hash -16365692, now seen corresponding path program 1 times [2021-11-23 17:37:11,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:11,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1242927553] [2021-11-23 17:37:11,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:11,839 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:11,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:11,840 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:11,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2021-11-23 17:37:11,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:11,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:11,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:14,658 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:14,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:15,398 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:15,398 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:15,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1242927553] [2021-11-23 17:37:15,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1242927553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:15,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [535474962] [2021-11-23 17:37:15,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:15,399 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:15,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:15,409 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:15,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Waiting until timeout for monitored process [2021-11-23 17:37:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:15,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:15,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:18,056 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:18,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:18,529 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:18,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [535474962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:18,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18203689] [2021-11-23 17:37:18,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:18,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:18,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:18,531 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:18,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-23 17:37:18,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:18,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:18,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:20,791 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:37:20,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:21,686 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:37:21,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18203689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:21,686 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:21,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:37:21,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500640749] [2021-11-23 17:37:21,687 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:21,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:37:21,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:21,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:37:21,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:37:21,688 INFO L87 Difference]: Start difference. First operand 2241 states and 2696 transitions. Second operand has 34 states, 34 states have (on average 13.117647058823529) internal successors, (446), 33 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:22,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:22,305 INFO L93 Difference]: Finished difference Result 2854 states and 3478 transitions. [2021-11-23 17:37:22,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:37:22,306 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.117647058823529) internal successors, (446), 33 states have internal predecessors, (446), 0 states have call successors, (0), 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 17:37:22,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:22,309 INFO L225 Difference]: With dead ends: 2854 [2021-11-23 17:37:22,310 INFO L226 Difference]: Without dead ends: 2273 [2021-11-23 17:37:22,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=242, Invalid=1650, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:37:22,313 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 175 mSDsluCounter, 1583 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 1682 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:22,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 1682 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 129 Unchecked, 0.0s Time] [2021-11-23 17:37:22,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2273 states. [2021-11-23 17:37:22,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2273 to 2225. [2021-11-23 17:37:22,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2225 states, 2224 states have (on average 1.2023381294964028) internal successors, (2674), 2224 states have internal predecessors, (2674), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:22,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2225 states to 2225 states and 2674 transitions. [2021-11-23 17:37:22,534 INFO L78 Accepts]: Start accepts. Automaton has 2225 states and 2674 transitions. Word has length 135 [2021-11-23 17:37:22,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:22,535 INFO L470 AbstractCegarLoop]: Abstraction has 2225 states and 2674 transitions. [2021-11-23 17:37:22,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.117647058823529) internal successors, (446), 33 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:22,535 INFO L276 IsEmpty]: Start isEmpty. Operand 2225 states and 2674 transitions. [2021-11-23 17:37:22,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:22,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:22,539 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:22,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Ended with exit code 0 [2021-11-23 17:37:22,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Ended with exit code 0 [2021-11-23 17:37:22,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:23,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:23,154 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:23,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:23,155 INFO L85 PathProgramCache]: Analyzing trace with hash -1570230647, now seen corresponding path program 1 times [2021-11-23 17:37:23,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:23,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [878522874] [2021-11-23 17:37:23,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:23,156 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:23,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:23,157 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:23,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Waiting until timeout for monitored process [2021-11-23 17:37:23,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:23,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:23,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:24,452 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:24,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:25,136 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:25,137 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:25,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [878522874] [2021-11-23 17:37:25,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [878522874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:25,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1455468320] [2021-11-23 17:37:25,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:25,138 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:25,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:25,140 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:25,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (104)] Waiting until timeout for monitored process [2021-11-23 17:37:25,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:25,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:25,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:26,476 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:26,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:27,078 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:27,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1455468320] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:27,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444589095] [2021-11-23 17:37:27,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:27,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:27,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:27,084 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:27,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-23 17:37:27,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:27,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:27,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:28,319 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:28,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:28,931 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:28,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444589095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:28,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:28,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:37:28,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158005137] [2021-11-23 17:37:28,932 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:28,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:37:28,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:28,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:37:28,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:37:28,934 INFO L87 Difference]: Start difference. First operand 2225 states and 2674 transitions. Second operand has 16 states, 16 states have (on average 12.0625) internal successors, (193), 15 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:29,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:29,379 INFO L93 Difference]: Finished difference Result 3589 states and 4440 transitions. [2021-11-23 17:37:29,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:37:29,380 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.0625) internal successors, (193), 15 states have internal predecessors, (193), 0 states have call successors, (0), 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 17:37:29,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:29,383 INFO L225 Difference]: With dead ends: 3589 [2021-11-23 17:37:29,383 INFO L226 Difference]: Without dead ends: 2973 [2021-11-23 17:37:29,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 814 GetRequests, 792 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 17:37:29,385 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 196 mSDsluCounter, 696 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:29,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 790 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 72 Unchecked, 0.0s Time] [2021-11-23 17:37:29,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2973 states. [2021-11-23 17:37:29,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2973 to 2947. [2021-11-23 17:37:29,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2947 states, 2946 states have (on average 1.221317040054311) internal successors, (3598), 2946 states have internal predecessors, (3598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:29,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2947 states to 2947 states and 3598 transitions. [2021-11-23 17:37:29,629 INFO L78 Accepts]: Start accepts. Automaton has 2947 states and 3598 transitions. Word has length 135 [2021-11-23 17:37:29,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:29,630 INFO L470 AbstractCegarLoop]: Abstraction has 2947 states and 3598 transitions. [2021-11-23 17:37:29,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.0625) internal successors, (193), 15 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:29,630 INFO L276 IsEmpty]: Start isEmpty. Operand 2947 states and 3598 transitions. [2021-11-23 17:37:29,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:29,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:29,635 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:29,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:29,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:30,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:30,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:30,238 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:30,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:30,238 INFO L85 PathProgramCache]: Analyzing trace with hash -1917462165, now seen corresponding path program 1 times [2021-11-23 17:37:30,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:30,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1022141045] [2021-11-23 17:37:30,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:30,239 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:30,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:30,243 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:30,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2021-11-23 17:37:30,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:30,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:37:30,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:31,315 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:37:31,315 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:37:31,315 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:31,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1022141045] [2021-11-23 17:37:31,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1022141045] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:37:31,316 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:37:31,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:37:31,316 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944945809] [2021-11-23 17:37:31,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:37:31,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:37:31,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:31,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:37:31,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:37:31,317 INFO L87 Difference]: Start difference. First operand 2947 states and 3598 transitions. Second operand has 6 states, 6 states have (on average 21.0) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:31,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:31,622 INFO L93 Difference]: Finished difference Result 4268 states and 5304 transitions. [2021-11-23 17:37:31,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:37:31,623 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.0) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 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 17:37:31,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:31,626 INFO L225 Difference]: With dead ends: 4268 [2021-11-23 17:37:31,626 INFO L226 Difference]: Without dead ends: 3623 [2021-11-23 17:37:31,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:37:31,628 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 66 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:31,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 302 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 45 Unchecked, 0.0s Time] [2021-11-23 17:37:31,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3623 states. [2021-11-23 17:37:31,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3623 to 3599. [2021-11-23 17:37:31,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3599 states, 3598 states have (on average 1.227348526959422) internal successors, (4416), 3598 states have internal predecessors, (4416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:31,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3599 states to 3599 states and 4416 transitions. [2021-11-23 17:37:31,913 INFO L78 Accepts]: Start accepts. Automaton has 3599 states and 4416 transitions. Word has length 135 [2021-11-23 17:37:31,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:31,913 INFO L470 AbstractCegarLoop]: Abstraction has 3599 states and 4416 transitions. [2021-11-23 17:37:31,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.0) internal successors, (126), 5 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:31,914 INFO L276 IsEmpty]: Start isEmpty. Operand 3599 states and 4416 transitions. [2021-11-23 17:37:31,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:31,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:31,919 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:31,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:32,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:37:32,134 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:32,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:32,134 INFO L85 PathProgramCache]: Analyzing trace with hash 2141620331, now seen corresponding path program 1 times [2021-11-23 17:37:32,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:32,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1934563744] [2021-11-23 17:37:32,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:32,135 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:32,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:32,136 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:32,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 17:37:32,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:32,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:32,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:34,184 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 71 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:37:34,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:34,829 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 71 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:37:34,829 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:34,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1934563744] [2021-11-23 17:37:34,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1934563744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:34,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [364725593] [2021-11-23 17:37:34,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:34,830 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:34,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:34,831 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:34,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 17:37:35,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:35,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:35,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:36,424 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:36,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:37,211 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:37,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [364725593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:37,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726385426] [2021-11-23 17:37:37,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:37,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:37,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:37,213 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:37,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 17:37:37,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:37,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:37,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:38,427 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:38,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:39,089 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:39,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726385426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:39,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:39,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:37:39,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924345660] [2021-11-23 17:37:39,090 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:39,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:37:39,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:39,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:37:39,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:37:39,092 INFO L87 Difference]: Start difference. First operand 3599 states and 4416 transitions. Second operand has 32 states, 32 states have (on average 11.9375) internal successors, (382), 31 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:40,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:40,616 INFO L93 Difference]: Finished difference Result 5202 states and 6478 transitions. [2021-11-23 17:37:40,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:37:40,616 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 11.9375) internal successors, (382), 31 states have internal predecessors, (382), 0 states have call successors, (0), 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 17:37:40,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:40,621 INFO L225 Difference]: With dead ends: 5202 [2021-11-23 17:37:40,621 INFO L226 Difference]: Without dead ends: 4553 [2021-11-23 17:37:40,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 779 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=308, Invalid=2344, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:37:40,623 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 269 mSDsluCounter, 1638 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 1756 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:40,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 1756 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 97 Invalid, 0 Unknown, 147 Unchecked, 0.1s Time] [2021-11-23 17:37:40,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4553 states. [2021-11-23 17:37:40,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4553 to 4531. [2021-11-23 17:37:40,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4531 states, 4530 states have (on average 1.2359823399558498) internal successors, (5599), 4530 states have internal predecessors, (5599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:40,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4531 states to 4531 states and 5599 transitions. [2021-11-23 17:37:40,989 INFO L78 Accepts]: Start accepts. Automaton has 4531 states and 5599 transitions. Word has length 135 [2021-11-23 17:37:40,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:40,990 INFO L470 AbstractCegarLoop]: Abstraction has 4531 states and 5599 transitions. [2021-11-23 17:37:40,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 11.9375) internal successors, (382), 31 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:40,990 INFO L276 IsEmpty]: Start isEmpty. Operand 4531 states and 5599 transitions. [2021-11-23 17:37:40,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:40,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:40,996 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:41,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:41,233 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Ended with exit code 0 [2021-11-23 17:37:41,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:41,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:41,622 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:41,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:41,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1683507349, now seen corresponding path program 1 times [2021-11-23 17:37:41,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:41,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1233348209] [2021-11-23 17:37:41,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:41,623 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:41,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:41,624 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:41,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 17:37:41,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:41,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:41,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:43,675 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 75 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:37:43,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:44,247 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 75 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:37:44,247 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:44,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1233348209] [2021-11-23 17:37:44,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1233348209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:44,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1925535743] [2021-11-23 17:37:44,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:44,248 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:44,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:44,250 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:44,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-23 17:37:44,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:44,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:44,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:45,849 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:45,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:46,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1925535743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:46,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900998467] [2021-11-23 17:37:46,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:46,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:46,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:46,616 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:46,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 17:37:46,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:46,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:46,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:47,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:48,520 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:48,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900998467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:48,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:48,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:37:48,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950744826] [2021-11-23 17:37:48,521 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:48,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:37:48,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:48,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:37:48,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:37:48,523 INFO L87 Difference]: Start difference. First operand 4531 states and 5599 transitions. Second operand has 32 states, 32 states have (on average 12.03125) internal successors, (385), 31 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:49,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:49,974 INFO L93 Difference]: Finished difference Result 6540 states and 8177 transitions. [2021-11-23 17:37:49,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:37:49,975 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.03125) internal successors, (385), 31 states have internal predecessors, (385), 0 states have call successors, (0), 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 17:37:49,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:49,980 INFO L225 Difference]: With dead ends: 6540 [2021-11-23 17:37:49,981 INFO L226 Difference]: Without dead ends: 5887 [2021-11-23 17:37:49,983 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 779 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=300, Invalid=2352, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:37:49,984 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 134 mSDsluCounter, 2214 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 2329 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 156 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:49,984 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 2329 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 156 Unchecked, 0.0s Time] [2021-11-23 17:37:49,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5887 states. [2021-11-23 17:37:50,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5887 to 5883. [2021-11-23 17:37:50,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5883 states, 5882 states have (on average 1.2429445766746006) internal successors, (7311), 5882 states have internal predecessors, (7311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:50,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5883 states to 5883 states and 7311 transitions. [2021-11-23 17:37:50,478 INFO L78 Accepts]: Start accepts. Automaton has 5883 states and 7311 transitions. Word has length 135 [2021-11-23 17:37:50,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:50,479 INFO L470 AbstractCegarLoop]: Abstraction has 5883 states and 7311 transitions. [2021-11-23 17:37:50,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.03125) internal successors, (385), 31 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:50,480 INFO L276 IsEmpty]: Start isEmpty. Operand 5883 states and 7311 transitions. [2021-11-23 17:37:50,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:50,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:50,485 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:37:50,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:50,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:50,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-23 17:37:51,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:51,101 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:51,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:51,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1702454891, now seen corresponding path program 1 times [2021-11-23 17:37:51,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:51,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1706491256] [2021-11-23 17:37:51,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:51,102 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:51,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:51,103 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:51,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 17:37:51,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:51,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:51,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:52,755 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 79 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:37:52,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:53,523 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 79 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:37:53,523 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:53,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1706491256] [2021-11-23 17:37:53,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1706491256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:53,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [580821108] [2021-11-23 17:37:53,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:53,524 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:53,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:53,525 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:53,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 17:37:53,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:53,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:53,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:54,861 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:54,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:55,489 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:55,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [580821108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:55,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102863204] [2021-11-23 17:37:55,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:55,490 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:55,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:55,493 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:55,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 17:37:55,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:55,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:55,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:56,806 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:56,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:57,422 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 48 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:37:57,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102863204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:57,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:57,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:37:57,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482073897] [2021-11-23 17:37:57,423 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:57,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:37:57,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:57,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:37:57,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:37:57,424 INFO L87 Difference]: Start difference. First operand 5883 states and 7311 transitions. Second operand has 20 states, 20 states have (on average 13.7) internal successors, (274), 19 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:58,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:58,720 INFO L93 Difference]: Finished difference Result 10353 states and 13024 transitions. [2021-11-23 17:37:58,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:37:58,721 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 13.7) internal successors, (274), 19 states have internal predecessors, (274), 0 states have call successors, (0), 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 17:37:58,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:58,730 INFO L225 Difference]: With dead ends: 10353 [2021-11-23 17:37:58,730 INFO L226 Difference]: Without dead ends: 9696 [2021-11-23 17:37:58,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 789 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:37:58,734 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 205 mSDsluCounter, 1295 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 1418 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 262 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:58,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 1418 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 81 Invalid, 0 Unknown, 262 Unchecked, 0.1s Time] [2021-11-23 17:37:58,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9696 states. [2021-11-23 17:37:59,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9696 to 9617. [2021-11-23 17:37:59,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9617 states, 9616 states have (on average 1.2477121464226288) internal successors, (11998), 9616 states have internal predecessors, (11998), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9617 states to 9617 states and 11998 transitions. [2021-11-23 17:37:59,516 INFO L78 Accepts]: Start accepts. Automaton has 9617 states and 11998 transitions. Word has length 135 [2021-11-23 17:37:59,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:59,516 INFO L470 AbstractCegarLoop]: Abstraction has 9617 states and 11998 transitions. [2021-11-23 17:37:59,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 13.7) internal successors, (274), 19 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,516 INFO L276 IsEmpty]: Start isEmpty. Operand 9617 states and 11998 transitions. [2021-11-23 17:37:59,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:37:59,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:59,520 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:59,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:59,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:59,933 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Ended with exit code 0 [2021-11-23 17:38:00,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:00,122 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:00,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:00,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1067228850, now seen corresponding path program 1 times [2021-11-23 17:38:00,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:00,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [885736811] [2021-11-23 17:38:00,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:00,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:00,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:00,124 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:00,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 17:38:00,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:00,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:00,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:01,174 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:38:01,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:01,174 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:01,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [885736811] [2021-11-23 17:38:01,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [885736811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:01,175 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:01,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:01,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680401937] [2021-11-23 17:38:01,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:01,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:01,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:01,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:01,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:01,176 INFO L87 Difference]: Start difference. First operand 9617 states and 11998 transitions. Second operand has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:02,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:02,165 INFO L93 Difference]: Finished difference Result 14203 states and 17815 transitions. [2021-11-23 17:38:02,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:02,165 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 0 states have call successors, (0), 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 17:38:02,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:02,179 INFO L225 Difference]: With dead ends: 14203 [2021-11-23 17:38:02,179 INFO L226 Difference]: Without dead ends: 12492 [2021-11-23 17:38:02,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:38:02,184 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 93 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:02,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 257 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 17:38:02,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12492 states. [2021-11-23 17:38:03,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12492 to 12430. [2021-11-23 17:38:03,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12430 states, 12429 states have (on average 1.2461984069514844) internal successors, (15489), 12429 states have internal predecessors, (15489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12430 states to 12430 states and 15489 transitions. [2021-11-23 17:38:03,236 INFO L78 Accepts]: Start accepts. Automaton has 12430 states and 15489 transitions. Word has length 135 [2021-11-23 17:38:03,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:03,236 INFO L470 AbstractCegarLoop]: Abstraction has 12430 states and 15489 transitions. [2021-11-23 17:38:03,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,237 INFO L276 IsEmpty]: Start isEmpty. Operand 12430 states and 15489 transitions. [2021-11-23 17:38:03,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:38:03,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:03,242 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:03,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:03,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:03,443 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:03,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:03,443 INFO L85 PathProgramCache]: Analyzing trace with hash 690850763, now seen corresponding path program 1 times [2021-11-23 17:38:03,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:03,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [949820016] [2021-11-23 17:38:03,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:03,444 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:03,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:03,445 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:03,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2021-11-23 17:38:03,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:03,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:03,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:04,471 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:38:04,472 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:04,472 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:04,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [949820016] [2021-11-23 17:38:04,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [949820016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:04,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:04,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:04,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831298375] [2021-11-23 17:38:04,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:04,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:04,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:04,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:04,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:04,474 INFO L87 Difference]: Start difference. First operand 12430 states and 15489 transitions. Second operand has 6 states, 6 states have (on average 20.666666666666668) internal successors, (124), 5 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:05,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:05,796 INFO L93 Difference]: Finished difference Result 19182 states and 23984 transitions. [2021-11-23 17:38:05,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:05,796 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 20.666666666666668) internal successors, (124), 5 states have internal predecessors, (124), 0 states have call successors, (0), 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 17:38:05,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:05,819 INFO L225 Difference]: With dead ends: 19182 [2021-11-23 17:38:05,819 INFO L226 Difference]: Without dead ends: 17463 [2021-11-23 17:38:05,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:38:05,825 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 94 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:05,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 264 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 41 Unchecked, 0.0s Time] [2021-11-23 17:38:05,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17463 states. [2021-11-23 17:38:07,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17463 to 17367. [2021-11-23 17:38:07,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17367 states, 17366 states have (on average 1.242024645859726) internal successors, (21569), 17366 states have internal predecessors, (21569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:07,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17367 states to 17367 states and 21569 transitions. [2021-11-23 17:38:07,735 INFO L78 Accepts]: Start accepts. Automaton has 17367 states and 21569 transitions. Word has length 135 [2021-11-23 17:38:07,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:07,736 INFO L470 AbstractCegarLoop]: Abstraction has 17367 states and 21569 transitions. [2021-11-23 17:38:07,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 20.666666666666668) internal successors, (124), 5 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:07,736 INFO L276 IsEmpty]: Start isEmpty. Operand 17367 states and 21569 transitions. [2021-11-23 17:38:07,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:38:07,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:07,742 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:07,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:07,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:07,943 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:07,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:07,943 INFO L85 PathProgramCache]: Analyzing trace with hash -763635886, now seen corresponding path program 1 times [2021-11-23 17:38:07,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:07,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1254953974] [2021-11-23 17:38:07,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:07,944 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:07,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:07,945 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:07,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 17:38:08,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:08,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:38:08,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:10,039 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:38:10,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:10,806 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:38:10,806 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:10,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1254953974] [2021-11-23 17:38:10,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1254953974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:10,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [323723277] [2021-11-23 17:38:10,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:10,807 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:10,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:10,808 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:10,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Waiting until timeout for monitored process [2021-11-23 17:38:10,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:10,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:10,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:14,206 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:14,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:15,191 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:15,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [323723277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:15,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676727032] [2021-11-23 17:38:15,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:15,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:15,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:15,193 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:15,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-23 17:38:15,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:15,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:15,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:18,203 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:18,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:18,819 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:18,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676727032] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:18,819 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:18,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 39 [2021-11-23 17:38:18,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695082635] [2021-11-23 17:38:18,820 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:18,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:38:18,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:18,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:38:18,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:38:18,821 INFO L87 Difference]: Start difference. First operand 17367 states and 21569 transitions. Second operand has 40 states, 40 states have (on average 10.975) internal successors, (439), 39 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:21,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:21,764 INFO L93 Difference]: Finished difference Result 18789 states and 23354 transitions. [2021-11-23 17:38:21,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:38:21,765 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 10.975) internal successors, (439), 39 states have internal predecessors, (439), 0 states have call successors, (0), 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 17:38:21,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:21,788 INFO L225 Difference]: With dead ends: 18789 [2021-11-23 17:38:21,789 INFO L226 Difference]: Without dead ends: 18144 [2021-11-23 17:38:21,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 830 GetRequests, 768 SyntacticMatches, 6 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=313, Invalid=2993, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:38:21,794 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 342 mSDsluCounter, 3029 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 3150 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 552 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:21,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 3150 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 168 Invalid, 0 Unknown, 552 Unchecked, 0.1s Time] [2021-11-23 17:38:21,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18144 states. [2021-11-23 17:38:23,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18144 to 17959. [2021-11-23 17:38:23,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17959 states, 17958 states have (on average 1.2413965920481123) internal successors, (22293), 17958 states have internal predecessors, (22293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:23,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17959 states to 17959 states and 22293 transitions. [2021-11-23 17:38:23,405 INFO L78 Accepts]: Start accepts. Automaton has 17959 states and 22293 transitions. Word has length 135 [2021-11-23 17:38:23,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:23,405 INFO L470 AbstractCegarLoop]: Abstraction has 17959 states and 22293 transitions. [2021-11-23 17:38:23,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 10.975) internal successors, (439), 39 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:23,406 INFO L276 IsEmpty]: Start isEmpty. Operand 17959 states and 22293 transitions. [2021-11-23 17:38:23,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 17:38:23,412 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:23,412 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:23,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:23,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:23,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:24,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:24,014 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:24,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:24,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1438686126, now seen corresponding path program 1 times [2021-11-23 17:38:24,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:24,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [568534277] [2021-11-23 17:38:24,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:24,015 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:24,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:24,016 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:24,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Waiting until timeout for monitored process [2021-11-23 17:38:24,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:24,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:38:24,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:25,588 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:38:25,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:26,342 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:38:26,343 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:26,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [568534277] [2021-11-23 17:38:26,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [568534277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:26,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1073025147] [2021-11-23 17:38:26,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:26,343 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:26,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:26,344 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:26,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Waiting until timeout for monitored process [2021-11-23 17:38:26,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:26,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:26,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:28,396 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:28,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:29,083 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:29,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1073025147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:29,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504604781] [2021-11-23 17:38:29,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:29,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:29,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:29,084 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:29,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-23 17:38:29,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:29,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:29,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:30,939 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:30,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:31,962 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:31,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504604781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:31,962 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:31,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:38:31,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576713242] [2021-11-23 17:38:31,963 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:31,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:38:31,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:31,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:38:31,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:38:31,964 INFO L87 Difference]: Start difference. First operand 17959 states and 22293 transitions. Second operand has 39 states, 39 states have (on average 13.461538461538462) internal successors, (525), 38 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:37,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:37,142 INFO L93 Difference]: Finished difference Result 31130 states and 39001 transitions. [2021-11-23 17:38:37,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-23 17:38:37,142 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 13.461538461538462) internal successors, (525), 38 states have internal predecessors, (525), 0 states have call successors, (0), 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 17:38:37,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:37,178 INFO L225 Difference]: With dead ends: 31130 [2021-11-23 17:38:37,178 INFO L226 Difference]: Without dead ends: 27724 [2021-11-23 17:38:37,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 879 GetRequests, 782 SyntacticMatches, 3 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2753 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=793, Invalid=8327, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 17:38:37,187 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 589 mSDsluCounter, 3616 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 589 SdHoareTripleChecker+Valid, 3776 SdHoareTripleChecker+Invalid, 1611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1149 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:37,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [589 Valid, 3776 Invalid, 1611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 444 Invalid, 0 Unknown, 1149 Unchecked, 0.4s Time] [2021-11-23 17:38:37,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27724 states. [2021-11-23 17:38:39,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27724 to 25650. [2021-11-23 17:38:39,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25650 states, 25649 states have (on average 1.2368513392334983) internal successors, (31724), 25649 states have internal predecessors, (31724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:39,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25650 states to 25650 states and 31724 transitions. [2021-11-23 17:38:39,551 INFO L78 Accepts]: Start accepts. Automaton has 25650 states and 31724 transitions. Word has length 135 [2021-11-23 17:38:39,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:39,552 INFO L470 AbstractCegarLoop]: Abstraction has 25650 states and 31724 transitions. [2021-11-23 17:38:39,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 13.461538461538462) internal successors, (525), 38 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:39,552 INFO L276 IsEmpty]: Start isEmpty. Operand 25650 states and 31724 transitions. [2021-11-23 17:38:39,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:38:39,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:39,559 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:38:39,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:39,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:39,961 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Ended with exit code 0 [2021-11-23 17:38:40,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:40,160 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:40,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:40,160 INFO L85 PathProgramCache]: Analyzing trace with hash 716002642, now seen corresponding path program 1 times [2021-11-23 17:38:40,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:40,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1657745531] [2021-11-23 17:38:40,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:40,162 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:40,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:40,163 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:40,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Waiting until timeout for monitored process [2021-11-23 17:38:40,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:40,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:38:40,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:44,213 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:44,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:46,712 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:46,712 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:46,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1657745531] [2021-11-23 17:38:46,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1657745531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:46,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1749090838] [2021-11-23 17:38:46,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:46,713 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:46,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:46,714 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:46,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Waiting until timeout for monitored process [2021-11-23 17:38:46,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:46,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:38:46,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:52,073 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:52,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:55,938 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:55,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1749090838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:55,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514339054] [2021-11-23 17:38:55,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:55,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:55,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:55,940 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:55,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-23 17:38:56,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:56,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:38:56,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:01,516 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:01,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:03,066 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:03,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514339054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:03,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:03,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23, 22, 22, 21] total 103 [2021-11-23 17:39:03,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303654548] [2021-11-23 17:39:03,067 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:03,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-23 17:39:03,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:03,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-23 17:39:03,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=10114, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 17:39:03,070 INFO L87 Difference]: Start difference. First operand 25650 states and 31724 transitions. Second operand has 103 states, 103 states have (on average 5.951456310679611) internal successors, (613), 103 states have internal predecessors, (613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:18,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:18,082 INFO L93 Difference]: Finished difference Result 40753 states and 49833 transitions. [2021-11-23 17:39:18,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-23 17:39:18,083 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 5.951456310679611) internal successors, (613), 103 states have internal predecessors, (613), 0 states have call successors, (0), 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 136 [2021-11-23 17:39:18,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:18,132 INFO L225 Difference]: With dead ends: 40753 [2021-11-23 17:39:18,133 INFO L226 Difference]: Without dead ends: 39353 [2021-11-23 17:39:18,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 876 GetRequests, 728 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 6378 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=1122, Invalid=21228, Unknown=0, NotChecked=0, Total=22350 [2021-11-23 17:39:18,142 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 433 mSDsluCounter, 8001 mSDsCounter, 0 mSdLazyCounter, 1038 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 433 SdHoareTripleChecker+Valid, 8170 SdHoareTripleChecker+Invalid, 1831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1038 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 758 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:18,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [433 Valid, 8170 Invalid, 1831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1038 Invalid, 0 Unknown, 758 Unchecked, 1.1s Time] [2021-11-23 17:39:18,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39353 states. [2021-11-23 17:39:20,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39353 to 25662. [2021-11-23 17:39:20,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25662 states, 25661 states have (on average 1.2368185183741864) internal successors, (31738), 25661 states have internal predecessors, (31738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:20,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25662 states to 25662 states and 31738 transitions. [2021-11-23 17:39:20,929 INFO L78 Accepts]: Start accepts. Automaton has 25662 states and 31738 transitions. Word has length 136 [2021-11-23 17:39:20,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:20,930 INFO L470 AbstractCegarLoop]: Abstraction has 25662 states and 31738 transitions. [2021-11-23 17:39:20,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 5.951456310679611) internal successors, (613), 103 states have internal predecessors, (613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:20,930 INFO L276 IsEmpty]: Start isEmpty. Operand 25662 states and 31738 transitions. [2021-11-23 17:39:20,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:39:20,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:20,937 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:39:20,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:21,146 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Ended with exit code 0 [2021-11-23 17:39:21,339 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Ended with exit code 0 [2021-11-23 17:39:21,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:21,538 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:21,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:21,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1646298453, now seen corresponding path program 1 times [2021-11-23 17:39:21,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:21,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [567449549] [2021-11-23 17:39:21,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:21,539 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:21,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:21,540 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:21,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (127)] Waiting until timeout for monitored process [2021-11-23 17:39:21,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:21,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:39:21,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:31,391 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 34 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:31,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:37,289 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:37,289 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:37,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [567449549] [2021-11-23 17:39:37,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [567449549] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:37,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [887589891] [2021-11-23 17:39:37,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:37,290 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:37,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:37,291 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:37,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (128)] Waiting until timeout for monitored process [2021-11-23 17:39:37,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:37,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:39:37,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 34 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:44,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:47,314 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:47,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [887589891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:47,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744901701] [2021-11-23 17:39:47,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:47,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:47,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:47,318 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:47,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-23 17:39:47,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:47,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:39:47,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:50,874 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 34 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:50,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:51,633 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:51,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744901701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:51,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:51,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 22, 21, 22, 21] total 82 [2021-11-23 17:39:51,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618552992] [2021-11-23 17:39:51,635 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:51,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:39:51,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:51,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:39:51,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=6048, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:39:51,637 INFO L87 Difference]: Start difference. First operand 25662 states and 31738 transitions. Second operand has 82 states, 82 states have (on average 5.170731707317073) internal successors, (424), 82 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:00,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:00,350 INFO L93 Difference]: Finished difference Result 35026 states and 43078 transitions. [2021-11-23 17:40:00,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 17:40:00,351 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 5.170731707317073) internal successors, (424), 82 states have internal predecessors, (424), 0 states have call successors, (0), 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 136 [2021-11-23 17:40:00,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:00,392 INFO L225 Difference]: With dead ends: 35026 [2021-11-23 17:40:00,393 INFO L226 Difference]: Without dead ends: 33525 [2021-11-23 17:40:00,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3548 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=976, Invalid=9736, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 17:40:00,403 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 581 mSDsluCounter, 4500 mSDsCounter, 0 mSdLazyCounter, 976 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 581 SdHoareTripleChecker+Valid, 4676 SdHoareTripleChecker+Invalid, 1569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 976 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 564 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:00,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [581 Valid, 4676 Invalid, 1569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 976 Invalid, 0 Unknown, 564 Unchecked, 1.3s Time] [2021-11-23 17:40:00,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33525 states. [2021-11-23 17:40:03,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33525 to 25615. [2021-11-23 17:40:03,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25615 states, 25614 states have (on average 1.2369016943858828) internal successors, (31682), 25614 states have internal predecessors, (31682), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:03,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25615 states to 25615 states and 31682 transitions. [2021-11-23 17:40:03,331 INFO L78 Accepts]: Start accepts. Automaton has 25615 states and 31682 transitions. Word has length 136 [2021-11-23 17:40:03,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:03,332 INFO L470 AbstractCegarLoop]: Abstraction has 25615 states and 31682 transitions. [2021-11-23 17:40:03,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 5.170731707317073) internal successors, (424), 82 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:03,332 INFO L276 IsEmpty]: Start isEmpty. Operand 25615 states and 31682 transitions. [2021-11-23 17:40:03,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:40:03,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:03,339 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:40:03,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (127)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:03,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (128)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:03,773 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Ended with exit code 0 [2021-11-23 17:40:03,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:03,940 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:03,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:03,940 INFO L85 PathProgramCache]: Analyzing trace with hash -934682830, now seen corresponding path program 1 times [2021-11-23 17:40:03,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:03,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1041071938] [2021-11-23 17:40:03,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:03,941 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:03,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:03,942 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:03,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (130)] Waiting until timeout for monitored process [2021-11-23 17:40:04,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:04,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:40:04,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:07,244 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 43 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:07,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:07,878 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 43 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:07,879 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:07,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1041071938] [2021-11-23 17:40:07,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1041071938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:07,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1819868148] [2021-11-23 17:40:07,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:07,879 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:07,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:07,880 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:07,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (131)] Waiting until timeout for monitored process [2021-11-23 17:40:08,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:08,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:40:08,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:12,450 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:12,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:15,552 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:15,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1819868148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:15,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010456456] [2021-11-23 17:40:15,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:15,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:15,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:15,554 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:15,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2021-11-23 17:40:15,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:15,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:40:15,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:20,207 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:20,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:21,398 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:21,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010456456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:21,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:21,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 23, 22, 22, 21] total 84 [2021-11-23 17:40:21,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651817274] [2021-11-23 17:40:21,399 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:21,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-23 17:40:21,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:21,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-23 17:40:21,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=6675, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:40:21,401 INFO L87 Difference]: Start difference. First operand 25615 states and 31682 transitions. Second operand has 84 states, 84 states have (on average 7.142857142857143) internal successors, (600), 84 states have internal predecessors, (600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:28,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:28,671 INFO L93 Difference]: Finished difference Result 28512 states and 35255 transitions. [2021-11-23 17:40:28,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 17:40:28,672 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 7.142857142857143) internal successors, (600), 84 states have internal predecessors, (600), 0 states have call successors, (0), 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 136 [2021-11-23 17:40:28,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:28,704 INFO L225 Difference]: With dead ends: 28512 [2021-11-23 17:40:28,705 INFO L226 Difference]: Without dead ends: 27472 [2021-11-23 17:40:28,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3829 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=638, Invalid=12472, Unknown=0, NotChecked=0, Total=13110 [2021-11-23 17:40:28,712 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 222 mSDsluCounter, 4437 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 4546 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 259 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:28,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [222 Valid, 4546 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 292 Invalid, 0 Unknown, 259 Unchecked, 0.3s Time] [2021-11-23 17:40:28,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27472 states. [2021-11-23 17:40:31,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27472 to 25611. [2021-11-23 17:40:31,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25611 states, 25610 states have (on average 1.2368996485747754) internal successors, (31677), 25610 states have internal predecessors, (31677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:31,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25611 states to 25611 states and 31677 transitions. [2021-11-23 17:40:31,324 INFO L78 Accepts]: Start accepts. Automaton has 25611 states and 31677 transitions. Word has length 136 [2021-11-23 17:40:31,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:31,324 INFO L470 AbstractCegarLoop]: Abstraction has 25611 states and 31677 transitions. [2021-11-23 17:40:31,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 7.142857142857143) internal successors, (600), 84 states have internal predecessors, (600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:31,324 INFO L276 IsEmpty]: Start isEmpty. Operand 25611 states and 31677 transitions. [2021-11-23 17:40:31,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:40:31,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:31,331 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:40:31,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:31,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (131)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:31,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (130)] Ended with exit code 0 [2021-11-23 17:40:31,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:31,932 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:31,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:31,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1929314142, now seen corresponding path program 1 times [2021-11-23 17:40:31,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:31,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [984689029] [2021-11-23 17:40:31,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:31,933 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:31,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:31,934 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:31,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Waiting until timeout for monitored process [2021-11-23 17:40:32,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:32,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:40:32,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:33,710 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:40:33,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:34,277 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:40:34,277 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:34,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [984689029] [2021-11-23 17:40:34,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [984689029] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:34,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1258998521] [2021-11-23 17:40:34,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:34,278 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:34,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:34,279 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:34,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Waiting until timeout for monitored process [2021-11-23 17:40:34,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:34,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:40:34,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:36,170 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:40:36,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:36,708 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:40:36,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1258998521] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:36,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432496602] [2021-11-23 17:40:36,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:36,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:36,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:36,709 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:36,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-23 17:40:36,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:36,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:40:36,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:38,915 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:40:38,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:39,550 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:40:39,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432496602] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:39,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:39,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:40:39,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310670370] [2021-11-23 17:40:39,551 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:39,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:40:39,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:39,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:40:39,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:40:39,553 INFO L87 Difference]: Start difference. First operand 25611 states and 31677 transitions. Second operand has 16 states, 16 states have (on average 13.8125) internal successors, (221), 15 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:42,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:42,351 INFO L93 Difference]: Finished difference Result 33589 states and 41707 transitions. [2021-11-23 17:40:42,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:40:42,352 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 13.8125) internal successors, (221), 15 states have internal predecessors, (221), 0 states have call successors, (0), 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 136 [2021-11-23 17:40:42,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:42,386 INFO L225 Difference]: With dead ends: 33589 [2021-11-23 17:40:42,386 INFO L226 Difference]: Without dead ends: 27217 [2021-11-23 17:40:42,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 798 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:40:42,398 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 236 mSDsluCounter, 547 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 655 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:42,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 655 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 69 Unchecked, 0.1s Time] [2021-11-23 17:40:42,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27217 states. [2021-11-23 17:40:45,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27217 to 27161. [2021-11-23 17:40:45,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27161 states, 27160 states have (on average 1.2316273932253314) internal successors, (33451), 27160 states have internal predecessors, (33451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:45,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27161 states to 27161 states and 33451 transitions. [2021-11-23 17:40:45,475 INFO L78 Accepts]: Start accepts. Automaton has 27161 states and 33451 transitions. Word has length 136 [2021-11-23 17:40:45,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:45,475 INFO L470 AbstractCegarLoop]: Abstraction has 27161 states and 33451 transitions. [2021-11-23 17:40:45,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 13.8125) internal successors, (221), 15 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:45,475 INFO L276 IsEmpty]: Start isEmpty. Operand 27161 states and 33451 transitions. [2021-11-23 17:40:45,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:40:45,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:45,482 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:40:45,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:45,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:45,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:46,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:46,083 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:46,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:46,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1868372631, now seen corresponding path program 1 times [2021-11-23 17:40:46,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:46,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [359888922] [2021-11-23 17:40:46,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:46,085 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:46,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:46,086 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:46,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Waiting until timeout for monitored process [2021-11-23 17:40:46,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:46,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:40:46,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:48,602 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 34 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:48,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:49,538 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 34 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:49,539 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:49,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [359888922] [2021-11-23 17:40:49,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [359888922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:49,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1411755769] [2021-11-23 17:40:49,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:49,539 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:49,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:49,540 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:49,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Waiting until timeout for monitored process [2021-11-23 17:40:49,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:49,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:40:49,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:52,618 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 34 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:52,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:53,471 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 34 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:53,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1411755769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:53,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6636312] [2021-11-23 17:40:53,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:53,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:53,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:53,473 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:53,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2021-11-23 17:40:53,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:53,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:40:53,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 34 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:57,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:58,471 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 34 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:58,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6636312] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:58,471 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:58,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:40:58,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514717791] [2021-11-23 17:40:58,472 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:58,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:40:58,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:58,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:40:58,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:40:58,474 INFO L87 Difference]: Start difference. First operand 27161 states and 33451 transitions. Second operand has 26 states, 26 states have (on average 9.73076923076923) internal successors, (253), 25 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:03,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:03,509 INFO L93 Difference]: Finished difference Result 44100 states and 54675 transitions. [2021-11-23 17:41:03,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:41:03,510 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 9.73076923076923) internal successors, (253), 25 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 17:41:03,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:03,566 INFO L225 Difference]: With dead ends: 44100 [2021-11-23 17:41:03,566 INFO L226 Difference]: Without dead ends: 37678 [2021-11-23 17:41:03,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 790 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=287, Invalid=2263, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:41:03,581 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 324 mSDsluCounter, 1941 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 2090 SdHoareTripleChecker+Invalid, 784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 286 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:03,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [324 Valid, 2090 Invalid, 784 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 474 Invalid, 0 Unknown, 286 Unchecked, 0.4s Time] [2021-11-23 17:41:03,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37678 states. [2021-11-23 17:41:05,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37678 to 19564. [2021-11-23 17:41:05,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19564 states, 19563 states have (on average 1.2215917804017788) internal successors, (23898), 19563 states have internal predecessors, (23898), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:05,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19564 states to 19564 states and 23898 transitions. [2021-11-23 17:41:05,960 INFO L78 Accepts]: Start accepts. Automaton has 19564 states and 23898 transitions. Word has length 136 [2021-11-23 17:41:05,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:05,961 INFO L470 AbstractCegarLoop]: Abstraction has 19564 states and 23898 transitions. [2021-11-23 17:41:05,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 9.73076923076923) internal successors, (253), 25 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:05,961 INFO L276 IsEmpty]: Start isEmpty. Operand 19564 states and 23898 transitions. [2021-11-23 17:41:05,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:41:05,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:05,967 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:41:05,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:06,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:06,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Ended with exit code 0 [2021-11-23 17:41:06,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:06,568 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:06,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:06,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1125525258, now seen corresponding path program 1 times [2021-11-23 17:41:06,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:06,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [586848343] [2021-11-23 17:41:06,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:06,570 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:06,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:06,571 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:06,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Waiting until timeout for monitored process [2021-11-23 17:41:06,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:06,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:06,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:08,309 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:41:08,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:09,068 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:41:09,068 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:09,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [586848343] [2021-11-23 17:41:09,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [586848343] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:09,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1983283818] [2021-11-23 17:41:09,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:09,068 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:09,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:09,069 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:09,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Waiting until timeout for monitored process [2021-11-23 17:41:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:09,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:41:09,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:13,150 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 26 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:13,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:13,901 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 26 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:13,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1983283818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:13,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378535008] [2021-11-23 17:41:13,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:13,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:13,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:13,903 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:13,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2021-11-23 17:41:13,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:13,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:41:13,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:16,663 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 26 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:41:16,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:17,583 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 26 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:41:17,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378535008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:17,583 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:17,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:41:17,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680109383] [2021-11-23 17:41:17,584 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:17,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:41:17,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:17,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:41:17,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:41:17,586 INFO L87 Difference]: Start difference. First operand 19564 states and 23898 transitions. Second operand has 48 states, 48 states have (on average 13.208333333333334) internal successors, (634), 47 states have internal predecessors, (634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:20,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:20,961 INFO L93 Difference]: Finished difference Result 24612 states and 30133 transitions. [2021-11-23 17:41:20,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:41:20,962 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 13.208333333333334) internal successors, (634), 47 states have internal predecessors, (634), 0 states have call successors, (0), 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 136 [2021-11-23 17:41:20,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:20,985 INFO L225 Difference]: With dead ends: 24612 [2021-11-23 17:41:20,985 INFO L226 Difference]: Without dead ends: 20390 [2021-11-23 17:41:20,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 836 GetRequests, 769 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=407, Invalid=3883, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:41:20,994 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 279 mSDsluCounter, 2844 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 2964 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 155 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:20,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 2964 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 106 Invalid, 0 Unknown, 155 Unchecked, 0.1s Time] [2021-11-23 17:41:21,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20390 states. [2021-11-23 17:41:23,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20390 to 19913. [2021-11-23 17:41:23,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19913 states, 19912 states have (on average 1.2213740458015268) internal successors, (24320), 19912 states have internal predecessors, (24320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:23,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19913 states to 19913 states and 24320 transitions. [2021-11-23 17:41:23,119 INFO L78 Accepts]: Start accepts. Automaton has 19913 states and 24320 transitions. Word has length 136 [2021-11-23 17:41:23,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:23,120 INFO L470 AbstractCegarLoop]: Abstraction has 19913 states and 24320 transitions. [2021-11-23 17:41:23,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 13.208333333333334) internal successors, (634), 47 states have internal predecessors, (634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:23,120 INFO L276 IsEmpty]: Start isEmpty. Operand 19913 states and 24320 transitions. [2021-11-23 17:41:23,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 17:41:23,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:23,125 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:23,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Ended with exit code 0 [2021-11-23 17:41:23,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Ended with exit code 0 [2021-11-23 17:41:23,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:23,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:23,731 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:23,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:23,732 INFO L85 PathProgramCache]: Analyzing trace with hash -2081928829, now seen corresponding path program 1 times [2021-11-23 17:41:23,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:23,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1968906880] [2021-11-23 17:41:23,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:23,733 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:23,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:23,734 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:23,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (142)] Waiting until timeout for monitored process [2021-11-23 17:41:23,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:23,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:41:23,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:27,095 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 31 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:27,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:29,785 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 31 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:29,785 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:29,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1968906880] [2021-11-23 17:41:29,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1968906880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:29,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [554545351] [2021-11-23 17:41:29,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:29,789 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:29,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:29,790 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:29,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (143)] Waiting until timeout for monitored process [2021-11-23 17:41:29,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:29,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:41:29,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:35,052 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 22 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:35,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:38,903 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 22 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:38,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [554545351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:38,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631907587] [2021-11-23 17:41:38,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:38,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:38,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:38,905 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:38,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Waiting until timeout for monitored process [2021-11-23 17:41:38,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:39,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:41:39,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:44,474 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 22 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:44,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:45,950 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 22 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:45,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631907587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:45,950 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:45,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23, 22, 22, 21] total 101 [2021-11-23 17:41:45,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747868376] [2021-11-23 17:41:45,951 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:45,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-23 17:41:45,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:45,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-23 17:41:45,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=9746, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 17:41:45,955 INFO L87 Difference]: Start difference. First operand 19913 states and 24320 transitions. Second operand has 101 states, 101 states have (on average 6.0495049504950495) internal successors, (611), 101 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) [2021-11-23 17:41:56,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:56,015 INFO L93 Difference]: Finished difference Result 26594 states and 32420 transitions. [2021-11-23 17:41:56,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 17:41:56,016 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 6.0495049504950495) internal successors, (611), 101 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) Word has length 137 [2021-11-23 17:41:56,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:56,038 INFO L225 Difference]: With dead ends: 26594 [2021-11-23 17:41:56,038 INFO L226 Difference]: Without dead ends: 22612 [2021-11-23 17:41:56,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 735 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5658 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=795, Invalid=18665, Unknown=0, NotChecked=0, Total=19460 [2021-11-23 17:41:56,046 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 278 mSDsluCounter, 7499 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 7630 SdHoareTripleChecker+Invalid, 1193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 784 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:56,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 7630 Invalid, 1193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 393 Invalid, 0 Unknown, 784 Unchecked, 0.5s Time] [2021-11-23 17:41:56,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22612 states. [2021-11-23 17:41:57,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22612 to 19913. [2021-11-23 17:41:58,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19913 states, 19912 states have (on average 1.2213238248292486) internal successors, (24319), 19912 states have internal predecessors, (24319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:58,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19913 states to 19913 states and 24319 transitions. [2021-11-23 17:41:58,032 INFO L78 Accepts]: Start accepts. Automaton has 19913 states and 24319 transitions. Word has length 137 [2021-11-23 17:41:58,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:58,033 INFO L470 AbstractCegarLoop]: Abstraction has 19913 states and 24319 transitions. [2021-11-23 17:41:58,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 6.0495049504950495) internal successors, (611), 101 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) [2021-11-23 17:41:58,033 INFO L276 IsEmpty]: Start isEmpty. Operand 19913 states and 24319 transitions. [2021-11-23 17:41:58,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 17:41:58,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:58,037 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:41:58,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (142)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:58,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (143)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:58,462 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Ended with exit code 0 [2021-11-23 17:41:58,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:58,638 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:58,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:58,638 INFO L85 PathProgramCache]: Analyzing trace with hash -939703123, now seen corresponding path program 1 times [2021-11-23 17:41:58,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:58,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [942964904] [2021-11-23 17:41:58,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:58,639 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:58,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:58,640 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:58,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (145)] Waiting until timeout for monitored process [2021-11-23 17:41:58,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:58,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:41:58,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:02,149 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:02,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:02,889 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 25 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:02,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:02,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [942964904] [2021-11-23 17:42:02,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [942964904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:02,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [594079913] [2021-11-23 17:42:02,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:02,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:02,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:02,891 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:02,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (146)] Waiting until timeout for monitored process [2021-11-23 17:42:03,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:03,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:42:03,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:06,881 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:06,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:09,716 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:09,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [594079913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:09,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042681270] [2021-11-23 17:42:09,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:09,717 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:09,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:09,720 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:09,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Waiting until timeout for monitored process [2021-11-23 17:42:09,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:09,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:42:09,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:13,760 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:13,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:14,757 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:14,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1042681270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:14,758 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:42:14,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 23, 22, 22, 21] total 85 [2021-11-23 17:42:14,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924854141] [2021-11-23 17:42:14,758 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:42:14,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-23 17:42:14,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:14,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-23 17:42:14,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=6848, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 17:42:14,760 INFO L87 Difference]: Start difference. First operand 19913 states and 24319 transitions. Second operand has 85 states, 85 states have (on average 7.270588235294118) internal successors, (618), 85 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:22,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:22,094 INFO L93 Difference]: Finished difference Result 31910 states and 38650 transitions. [2021-11-23 17:42:22,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:42:22,095 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 7.270588235294118) internal successors, (618), 85 states have internal predecessors, (618), 0 states have call successors, (0), 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 137 [2021-11-23 17:42:22,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:22,129 INFO L225 Difference]: With dead ends: 31910 [2021-11-23 17:42:22,129 INFO L226 Difference]: Without dead ends: 30548 [2021-11-23 17:42:22,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 861 GetRequests, 746 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3312 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=629, Invalid=12943, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:42:22,138 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 210 mSDsluCounter, 8936 mSDsCounter, 0 mSdLazyCounter, 645 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 9122 SdHoareTripleChecker+Invalid, 1483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 816 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:22,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 9122 Invalid, 1483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 645 Invalid, 0 Unknown, 816 Unchecked, 0.5s Time] [2021-11-23 17:42:22,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30548 states. [2021-11-23 17:42:24,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30548 to 19924. [2021-11-23 17:42:24,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19924 states, 19923 states have (on average 1.221302012749084) internal successors, (24332), 19923 states have internal predecessors, (24332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:24,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19924 states to 19924 states and 24332 transitions. [2021-11-23 17:42:24,277 INFO L78 Accepts]: Start accepts. Automaton has 19924 states and 24332 transitions. Word has length 137 [2021-11-23 17:42:24,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:24,278 INFO L470 AbstractCegarLoop]: Abstraction has 19924 states and 24332 transitions. [2021-11-23 17:42:24,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 7.270588235294118) internal successors, (618), 85 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:24,278 INFO L276 IsEmpty]: Start isEmpty. Operand 19924 states and 24332 transitions. [2021-11-23 17:42:24,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 17:42:24,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:24,281 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:42:24,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:24,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (146)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:24,689 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (145)] Ended with exit code 0 [2021-11-23 17:42:24,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:42:24,882 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:24,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:24,882 INFO L85 PathProgramCache]: Analyzing trace with hash -9407312, now seen corresponding path program 1 times [2021-11-23 17:42:24,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:24,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1791048360] [2021-11-23 17:42:24,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:24,883 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:24,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:24,883 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:24,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (148)] Waiting until timeout for monitored process [2021-11-23 17:42:24,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:24,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:42:24,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:33,953 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 34 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:33,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:39,026 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:39,026 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:39,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1791048360] [2021-11-23 17:42:39,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1791048360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:39,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [714006382] [2021-11-23 17:42:39,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:39,027 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:39,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:39,028 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:39,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (149)] Waiting until timeout for monitored process [2021-11-23 17:42:39,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:39,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:42:39,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:52,466 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 43 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:52,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:00,300 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:00,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [714006382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:00,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124981701] [2021-11-23 17:43:00,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:00,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:00,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:00,302 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:00,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_208a99de-d7c4-4279-9d3d-ac6b6ad39cb9/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Waiting until timeout for monitored process [2021-11-23 17:43:00,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:00,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-23 17:43:00,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:11,708 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 74 proven. 8 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:43:11,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:25,792 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:25,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124981701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:25,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:25,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 30, 28, 28, 36] total 154 [2021-11-23 17:43:25,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179023280] [2021-11-23 17:43:25,792 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:25,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-23 17:43:25,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:25,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-23 17:43:25,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2565, Invalid=20997, Unknown=0, NotChecked=0, Total=23562 [2021-11-23 17:43:25,796 INFO L87 Difference]: Start difference. First operand 19924 states and 24332 transitions. Second operand has 154 states, 154 states have (on average 4.298701298701299) internal successors, (662), 154 states have internal predecessors, (662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)