./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.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_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/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_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/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_f0d0b193-4d69-4972-9524-6e17a0113461/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 38d85b6b5a04cb96dc69842531ed31487f7945c34d1c701c72adfae91c235e8c --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:00:44,873 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:00:44,875 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:00:44,930 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:00:44,931 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:00:44,933 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:00:44,935 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:00:44,938 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:00:44,941 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:00:44,942 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:00:44,944 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:00:44,946 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:00:44,947 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:00:44,951 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:00:44,954 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:00:44,958 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:00:44,960 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:00:44,968 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:00:44,971 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:00:44,980 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:00:44,988 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:00:44,991 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:00:44,993 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:00:44,996 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:00:45,000 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:00:45,006 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:00:45,006 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:00:45,008 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:00:45,010 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:00:45,011 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:00:45,013 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:00:45,014 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:00:45,017 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:00:45,018 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:00:45,020 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:00:45,021 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:00:45,022 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:00:45,022 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:00:45,022 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:00:45,024 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:00:45,024 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:00:45,026 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:00:45,075 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:00:45,075 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:00:45,076 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:00:45,076 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:00:45,077 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:00:45,077 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:00:45,077 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:00:45,078 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:00:45,078 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:00:45,078 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:00:45,079 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:00:45,079 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:00:45,079 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:00:45,079 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:00:45,080 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:00:45,080 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:00:45,080 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:00:45,081 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:00:45,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:00:45,082 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:00:45,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:00:45,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:00:45,083 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:00:45,083 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:00:45,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:00:45,083 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:00:45,084 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:00:45,084 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:00:45,084 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:00:45,085 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:00:45,085 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:00:45,085 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:00:45,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:00:45,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:00:45,086 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:00:45,086 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:00:45,087 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:00:45,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:00:45,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:00:45,088 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:00:45,088 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:00:45,088 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_f0d0b193-4d69-4972-9524-6e17a0113461/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 38d85b6b5a04cb96dc69842531ed31487f7945c34d1c701c72adfae91c235e8c [2021-11-23 17:00:45,401 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:00:45,438 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:00:45,442 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:00:45,444 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:00:45,445 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:00:45,446 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c [2021-11-23 17:00:45,558 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/c53f7cf9c/e5e7d290c2f8443ebbf3c720f1613c82/FLAGf3d5d50ad [2021-11-23 17:00:46,612 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:00:46,614 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c [2021-11-23 17:00:46,663 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/c53f7cf9c/e5e7d290c2f8443ebbf3c720f1613c82/FLAGf3d5d50ad [2021-11-23 17:00:47,040 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/c53f7cf9c/e5e7d290c2f8443ebbf3c720f1613c82 [2021-11-23 17:00:47,043 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:00:47,045 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:00:47,046 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:00:47,047 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:00:47,051 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:00:47,052 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:00:47" (1/1) ... [2021-11-23 17:00:47,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e9b9258 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:47, skipping insertion in model container [2021-11-23 17:00:47,054 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:00:47" (1/1) ... [2021-11-23 17:00:47,062 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:00:47,201 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:00:47,576 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[8749,8762] [2021-11-23 17:00:47,648 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[15685,15698] [2021-11-23 17:00:48,822 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:00:48,840 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:00:48,900 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[8749,8762] [2021-11-23 17:00:48,917 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[15685,15698] [2021-11-23 17:00:49,536 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:00:49,572 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:00:49,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49 WrapperNode [2021-11-23 17:00:49,573 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:00:49,574 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:00:49,574 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:00:49,574 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:00:49,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:49,665 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,147 INFO L137 Inliner]: procedures = 36, calls = 21, calls flagged for inlining = 16, calls inlined = 16, statements flattened = 5032 [2021-11-23 17:00:50,148 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:00:50,149 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:00:50,150 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:00:50,150 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:00:50,161 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,161 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,225 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,225 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,481 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,529 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,545 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,677 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:00:50,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:00:50,678 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:00:50,679 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:00:50,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:49" (1/1) ... [2021-11-23 17:00:50,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:00:50,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:50,780 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:00:50,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:00:50,920 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:00:50,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:00:50,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:00:50,921 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:00:51,131 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:00:51,148 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:00:56,403 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:00:56,479 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 17:00:56,487 INFO L158 Benchmark]: Toolchain (without parser) took 9439.00ms. Allocated memory was 86.0MB in the beginning and 478.2MB in the end (delta: 392.2MB). Free memory was 56.0MB in the beginning and 249.3MB in the end (delta: -193.3MB). Peak memory consumption was 226.5MB. Max. memory is 16.1GB. [2021-11-23 17:00:56,488 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 86.0MB. Free memory was 42.1MB in the beginning and 42.0MB in the end (delta: 32.4kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:00:56,490 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2526.87ms. Allocated memory was 86.0MB in the beginning and 178.3MB in the end (delta: 92.3MB). Free memory was 55.6MB in the beginning and 116.6MB in the end (delta: -61.0MB). Peak memory consumption was 57.9MB. Max. memory is 16.1GB. [2021-11-23 17:00:56,491 INFO L158 Benchmark]: Boogie Procedure Inliner took 574.31ms. Allocated memory is still 178.3MB. Free memory was 116.6MB in the beginning and 74.1MB in the end (delta: 42.5MB). Peak memory consumption was 61.5MB. Max. memory is 16.1GB. [2021-11-23 17:00:56,492 INFO L158 Benchmark]: Boogie Preprocessor took 527.61ms. Allocated memory is still 178.3MB. Free memory was 74.1MB in the beginning and 62.9MB in the end (delta: 11.3MB). Peak memory consumption was 55.7MB. Max. memory is 16.1GB. [2021-11-23 17:00:56,494 INFO L158 Benchmark]: RCFGBuilder took 5804.65ms. Allocated memory was 178.3MB in the beginning and 478.2MB in the end (delta: 299.9MB). Free memory was 62.5MB in the beginning and 249.3MB in the end (delta: -186.8MB). Peak memory consumption was 139.5MB. Max. memory is 16.1GB. [2021-11-23 17:00:56,503 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 86.0MB. Free memory was 42.1MB in the beginning and 42.0MB in the end (delta: 32.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2526.87ms. Allocated memory was 86.0MB in the beginning and 178.3MB in the end (delta: 92.3MB). Free memory was 55.6MB in the beginning and 116.6MB in the end (delta: -61.0MB). Peak memory consumption was 57.9MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 574.31ms. Allocated memory is still 178.3MB. Free memory was 116.6MB in the beginning and 74.1MB in the end (delta: 42.5MB). Peak memory consumption was 61.5MB. Max. memory is 16.1GB. * Boogie Preprocessor took 527.61ms. Allocated memory is still 178.3MB. Free memory was 74.1MB in the beginning and 62.9MB in the end (delta: 11.3MB). Peak memory consumption was 55.7MB. Max. memory is 16.1GB. * RCFGBuilder took 5804.65ms. Allocated memory was 178.3MB in the beginning and 478.2MB in the end (delta: 299.9MB). Free memory was 62.5MB in the beginning and 249.3MB in the end (delta: -186.8MB). Peak memory consumption was 139.5MB. 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 17:00:56,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/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_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/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_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/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_f0d0b193-4d69-4972-9524-6e17a0113461/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 38d85b6b5a04cb96dc69842531ed31487f7945c34d1c701c72adfae91c235e8c --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:00:59,324 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:00:59,326 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:00:59,379 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:00:59,380 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:00:59,386 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:00:59,388 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:00:59,394 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:00:59,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:00:59,410 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:00:59,412 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:00:59,414 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:00:59,415 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:00:59,418 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:00:59,422 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:00:59,428 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:00:59,430 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:00:59,431 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:00:59,433 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:00:59,441 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:00:59,444 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:00:59,446 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:00:59,449 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:00:59,452 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:00:59,459 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:00:59,459 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:00:59,460 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:00:59,462 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:00:59,463 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:00:59,464 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:00:59,465 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:00:59,466 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:00:59,469 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:00:59,470 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:00:59,472 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:00:59,472 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:00:59,473 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:00:59,473 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:00:59,474 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:00:59,476 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:00:59,477 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:00:59,478 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:00:59,526 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:00:59,526 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:00:59,527 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:00:59,527 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:00:59,528 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:00:59,528 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:00:59,529 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:00:59,529 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:00:59,529 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:00:59,529 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:00:59,530 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:00:59,530 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:00:59,531 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:00:59,531 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:00:59,532 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:00:59,532 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:00:59,532 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:00:59,532 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:00:59,533 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:00:59,533 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:00:59,533 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:00:59,533 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:00:59,534 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:00:59,534 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:00:59,534 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:00:59,534 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:00:59,535 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:00:59,535 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:00:59,535 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:00:59,536 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:00:59,536 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:00:59,536 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:00:59,536 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:00:59,537 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:00:59,537 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:59,537 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:00:59,538 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:00:59,538 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:00:59,538 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_f0d0b193-4d69-4972-9524-6e17a0113461/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 38d85b6b5a04cb96dc69842531ed31487f7945c34d1c701c72adfae91c235e8c [2021-11-23 17:00:59,982 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:01:00,007 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:01:00,013 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:01:00,014 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:01:00,015 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:01:00,016 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c [2021-11-23 17:01:00,087 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/77cdce0ad/3f478d0ba3a34457a343d177e4854e20/FLAG3711ee9b8 [2021-11-23 17:01:01,071 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:01:01,071 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c [2021-11-23 17:01:01,117 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/77cdce0ad/3f478d0ba3a34457a343d177e4854e20/FLAG3711ee9b8 [2021-11-23 17:01:01,489 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/data/77cdce0ad/3f478d0ba3a34457a343d177e4854e20 [2021-11-23 17:01:01,491 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:01:01,494 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:01:01,495 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:01:01,495 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:01:01,500 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:01:01,501 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:01:01" (1/1) ... [2021-11-23 17:01:01,503 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e6caee9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:01, skipping insertion in model container [2021-11-23 17:01:01,503 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:01:01" (1/1) ... [2021-11-23 17:01:01,512 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:01:01,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:01:02,074 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[8749,8762] [2021-11-23 17:01:02,197 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[15685,15698] [2021-11-23 17:01:03,327 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:01:03,344 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:01:03,407 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[8749,8762] [2021-11-23 17:01:03,425 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_f0d0b193-4d69-4972-9524-6e17a0113461/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c[15685,15698] [2021-11-23 17:01:04,118 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:01:04,155 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:01:04,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04 WrapperNode [2021-11-23 17:01:04,156 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:01:04,157 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:01:04,157 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:01:04,157 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:01:04,166 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,252 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,479 INFO L137 Inliner]: procedures = 37, calls = 21, calls flagged for inlining = 16, calls inlined = 16, statements flattened = 5011 [2021-11-23 17:01:04,480 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:01:04,482 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:01:04,482 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:01:04,482 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:01:04,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,611 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,617 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,844 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,899 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,948 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:04,998 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:01:04,999 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:01:04,999 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:01:04,999 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:01:05,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (1/1) ... [2021-11-23 17:01:05,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:01:05,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:05,036 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:01:05,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:01:05,097 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:01:05,098 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:01:05,098 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:01:05,098 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:01:05,227 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:01:05,229 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:01:36,188 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:01:36,223 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:01:36,223 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:01:36,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:01:36 BoogieIcfgContainer [2021-11-23 17:01:36,229 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:01:36,232 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:01:36,232 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:01:36,236 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:01:36,236 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:01:01" (1/3) ... [2021-11-23 17:01:36,237 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e0f02ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:01:36, skipping insertion in model container [2021-11-23 17:01:36,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:04" (2/3) ... [2021-11-23 17:01:36,238 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e0f02ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:01:36, skipping insertion in model container [2021-11-23 17:01:36,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:01:36" (3/3) ... [2021-11-23 17:01:36,241 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.1.ufo.UNBOUNDED.pals+Problem12_label05.c [2021-11-23 17:01:36,249 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:01:36,249 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:01:36,333 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:01:36,350 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 17:01:36,351 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:01:36,395 INFO L276 IsEmpty]: Start isEmpty. Operand has 895 states, 892 states have (on average 1.9013452914798206) internal successors, (1696), 894 states have internal predecessors, (1696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:36,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 17:01:36,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:36,404 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] [2021-11-23 17:01:36,405 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:36,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:36,412 INFO L85 PathProgramCache]: Analyzing trace with hash 2085104645, now seen corresponding path program 1 times [2021-11-23 17:01:36,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:36,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2137444703] [2021-11-23 17:01:36,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:36,430 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:36,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:36,434 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:36,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:01:36,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:36,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:01:36,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:36,706 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 17:01:36,707 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:36,708 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:36,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2137444703] [2021-11-23 17:01:36,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2137444703] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:36,709 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:36,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:01:36,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237309170] [2021-11-23 17:01:36,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:36,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:01:36,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:36,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:01:36,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:01:36,755 INFO L87 Difference]: Start difference. First operand has 895 states, 892 states have (on average 1.9013452914798206) internal successors, (1696), 894 states have internal predecessors, (1696), 0 states have call successors, (0), 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 15.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:36,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:36,974 INFO L93 Difference]: Finished difference Result 1759 states and 3336 transitions. [2021-11-23 17:01:36,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:01:36,982 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 15.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 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 30 [2021-11-23 17:01:36,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:37,018 INFO L225 Difference]: With dead ends: 1759 [2021-11-23 17:01:37,018 INFO L226 Difference]: Without dead ends: 829 [2021-11-23 17:01:37,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 29 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 17:01:37,038 INFO L933 BasicCegarLoop]: 1627 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, 1627 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 17:01:37,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1627 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:37,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 829 states. [2021-11-23 17:01:37,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 829 to 829. [2021-11-23 17:01:37,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 827 states have (on average 1.8899637243047158) internal successors, (1563), 828 states have internal predecessors, (1563), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:37,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1563 transitions. [2021-11-23 17:01:37,165 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1563 transitions. Word has length 30 [2021-11-23 17:01:37,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:37,166 INFO L470 AbstractCegarLoop]: Abstraction has 829 states and 1563 transitions. [2021-11-23 17:01:37,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 15.0) internal successors, (30), 2 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:37,167 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1563 transitions. [2021-11-23 17:01:37,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 17:01:37,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:37,169 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] [2021-11-23 17:01:37,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:37,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:37,389 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:37,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:37,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1951091139, now seen corresponding path program 1 times [2021-11-23 17:01:37,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:37,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [731174370] [2021-11-23 17:01:37,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:37,392 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:37,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:37,397 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:37,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:01:37,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:37,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:01:37,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:37,730 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 17:01:37,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:37,730 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:37,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [731174370] [2021-11-23 17:01:37,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [731174370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:37,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:37,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:01:37,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965324504] [2021-11-23 17:01:37,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:37,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:01:37,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:37,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:01:37,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:01:37,734 INFO L87 Difference]: Start difference. First operand 829 states and 1563 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:37,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:37,916 INFO L93 Difference]: Finished difference Result 879 states and 1639 transitions. [2021-11-23 17:01:37,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:01:37,917 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 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 30 [2021-11-23 17:01:37,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:37,924 INFO L225 Difference]: With dead ends: 879 [2021-11-23 17:01:37,924 INFO L226 Difference]: Without dead ends: 829 [2021-11-23 17:01:37,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:01:37,927 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 3 mSDsluCounter, 4657 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 6218 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:37,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 6218 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:01:37,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 829 states. [2021-11-23 17:01:37,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 829 to 829. [2021-11-23 17:01:37,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 827 states have (on average 1.8621523579201935) internal successors, (1540), 828 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:37,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1540 transitions. [2021-11-23 17:01:37,958 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1540 transitions. Word has length 30 [2021-11-23 17:01:37,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:37,958 INFO L470 AbstractCegarLoop]: Abstraction has 829 states and 1540 transitions. [2021-11-23 17:01:37,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:37,959 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1540 transitions. [2021-11-23 17:01:37,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:01:37,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:37,962 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] [2021-11-23 17:01:37,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:38,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:38,182 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:38,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:38,183 INFO L85 PathProgramCache]: Analyzing trace with hash 568524862, now seen corresponding path program 1 times [2021-11-23 17:01:38,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:38,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1804352368] [2021-11-23 17:01:38,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:38,186 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:38,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:38,187 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:38,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:01:38,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:38,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:01:38,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:39,520 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 17:01:39,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:39,520 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:39,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1804352368] [2021-11-23 17:01:39,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1804352368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:39,526 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:39,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:01:39,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590999077] [2021-11-23 17:01:39,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:39,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:01:39,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:39,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:01:39,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:01:39,529 INFO L87 Difference]: Start difference. First operand 829 states and 1540 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:39,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:39,825 INFO L93 Difference]: Finished difference Result 1059 states and 1900 transitions. [2021-11-23 17:01:39,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:01:39,827 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 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 52 [2021-11-23 17:01:39,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:39,838 INFO L225 Difference]: With dead ends: 1059 [2021-11-23 17:01:39,838 INFO L226 Difference]: Without dead ends: 1013 [2021-11-23 17:01:39,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 47 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 17:01:39,843 INFO L933 BasicCegarLoop]: 1534 mSDtfsCounter, 4802 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4802 SdHoareTripleChecker+Valid, 1813 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:39,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4802 Valid, 1813 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:01:39,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1013 states. [2021-11-23 17:01:39,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1013 to 917. [2021-11-23 17:01:39,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 915 states have (on average 1.8349726775956283) internal successors, (1679), 916 states have internal predecessors, (1679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:39,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 1679 transitions. [2021-11-23 17:01:39,888 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 1679 transitions. Word has length 52 [2021-11-23 17:01:39,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:39,889 INFO L470 AbstractCegarLoop]: Abstraction has 917 states and 1679 transitions. [2021-11-23 17:01:39,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:39,890 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 1679 transitions. [2021-11-23 17:01:39,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:01:39,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:39,900 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 17:01:39,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:40,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:40,116 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:40,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:40,117 INFO L85 PathProgramCache]: Analyzing trace with hash -524152242, now seen corresponding path program 1 times [2021-11-23 17:01:40,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:40,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1005031334] [2021-11-23 17:01:40,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:40,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:40,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:40,119 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:40,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:01:40,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:40,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:40,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:40,498 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 17:01:40,498 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:40,499 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:40,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1005031334] [2021-11-23 17:01:40,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1005031334] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:40,499 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:40,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:40,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594426106] [2021-11-23 17:01:40,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:40,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:40,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:40,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:40,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:40,502 INFO L87 Difference]: Start difference. First operand 917 states and 1679 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:40,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:40,580 INFO L93 Difference]: Finished difference Result 1169 states and 2073 transitions. [2021-11-23 17:01:40,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:40,581 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:40,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:40,589 INFO L225 Difference]: With dead ends: 1169 [2021-11-23 17:01:40,590 INFO L226 Difference]: Without dead ends: 1035 [2021-11-23 17:01:40,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 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 17:01:40,599 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 1480 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1480 SdHoareTripleChecker+Valid, 1601 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:40,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1480 Valid, 1601 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:40,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1035 states. [2021-11-23 17:01:40,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1035 to 1030. [2021-11-23 17:01:40,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 1028 states have (on average 1.7996108949416343) internal successors, (1850), 1029 states have internal predecessors, (1850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:40,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1850 transitions. [2021-11-23 17:01:40,646 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1850 transitions. Word has length 54 [2021-11-23 17:01:40,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:40,649 INFO L470 AbstractCegarLoop]: Abstraction has 1030 states and 1850 transitions. [2021-11-23 17:01:40,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:40,649 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1850 transitions. [2021-11-23 17:01:40,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:01:40,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:40,650 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 17:01:40,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:40,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:40,869 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:40,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:40,870 INFO L85 PathProgramCache]: Analyzing trace with hash 1331255346, now seen corresponding path program 1 times [2021-11-23 17:01:40,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:40,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2132428431] [2021-11-23 17:01:40,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:40,874 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:40,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:40,877 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:40,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:01:40,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:40,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:40,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:41,172 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 17:01:41,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:41,172 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:41,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2132428431] [2021-11-23 17:01:41,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2132428431] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:41,173 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:41,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:41,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578759876] [2021-11-23 17:01:41,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:41,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:41,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:41,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:41,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:41,174 INFO L87 Difference]: Start difference. First operand 1030 states and 1850 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:41,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:41,237 INFO L93 Difference]: Finished difference Result 1488 states and 2554 transitions. [2021-11-23 17:01:41,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:41,238 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:41,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:41,247 INFO L225 Difference]: With dead ends: 1488 [2021-11-23 17:01:41,247 INFO L226 Difference]: Without dead ends: 1241 [2021-11-23 17:01:41,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 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 17:01:41,249 INFO L933 BasicCegarLoop]: 1557 mSDtfsCounter, 1489 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1489 SdHoareTripleChecker+Valid, 1639 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 17:01:41,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1489 Valid, 1639 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:41,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2021-11-23 17:01:41,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 1239. [2021-11-23 17:01:41,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1239 states, 1237 states have (on average 1.750202101859337) internal successors, (2165), 1238 states have internal predecessors, (2165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:41,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1239 states to 1239 states and 2165 transitions. [2021-11-23 17:01:41,296 INFO L78 Accepts]: Start accepts. Automaton has 1239 states and 2165 transitions. Word has length 54 [2021-11-23 17:01:41,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:41,297 INFO L470 AbstractCegarLoop]: Abstraction has 1239 states and 2165 transitions. [2021-11-23 17:01:41,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:41,297 INFO L276 IsEmpty]: Start isEmpty. Operand 1239 states and 2165 transitions. [2021-11-23 17:01:41,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:01:41,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:41,299 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:41,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:41,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:41,516 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:41,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:41,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1716204334, now seen corresponding path program 1 times [2021-11-23 17:01:41,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:41,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1104155093] [2021-11-23 17:01:41,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:41,518 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:41,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:41,519 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:41,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:01:41,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:41,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:41,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:41,797 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 17:01:41,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:41,798 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:41,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1104155093] [2021-11-23 17:01:41,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1104155093] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:41,798 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:41,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:41,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021640911] [2021-11-23 17:01:41,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:41,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:41,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:41,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:41,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:41,800 INFO L87 Difference]: Start difference. First operand 1239 states and 2165 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:41,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:41,874 INFO L93 Difference]: Finished difference Result 2079 states and 3439 transitions. [2021-11-23 17:01:41,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:41,875 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:41,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:41,887 INFO L225 Difference]: With dead ends: 2079 [2021-11-23 17:01:41,888 INFO L226 Difference]: Without dead ends: 1623 [2021-11-23 17:01:41,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 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 17:01:41,890 INFO L933 BasicCegarLoop]: 1570 mSDtfsCounter, 1493 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1493 SdHoareTripleChecker+Valid, 1648 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 17:01:41,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1493 Valid, 1648 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:41,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1623 states. [2021-11-23 17:01:41,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1623 to 1621. [2021-11-23 17:01:41,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1621 states, 1619 states have (on average 1.6856084002470662) internal successors, (2729), 1620 states have internal predecessors, (2729), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:41,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1621 states to 1621 states and 2729 transitions. [2021-11-23 17:01:41,991 INFO L78 Accepts]: Start accepts. Automaton has 1621 states and 2729 transitions. Word has length 54 [2021-11-23 17:01:41,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:41,991 INFO L470 AbstractCegarLoop]: Abstraction has 1621 states and 2729 transitions. [2021-11-23 17:01:41,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:41,992 INFO L276 IsEmpty]: Start isEmpty. Operand 1621 states and 2729 transitions. [2021-11-23 17:01:41,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:01:41,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:41,993 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 17:01:42,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:42,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:42,208 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:42,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:42,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1442516622, now seen corresponding path program 1 times [2021-11-23 17:01:42,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:42,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1014779686] [2021-11-23 17:01:42,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:42,210 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:42,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:42,211 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:42,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:01:42,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:42,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:42,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:42,479 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 17:01:42,479 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:42,479 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:42,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1014779686] [2021-11-23 17:01:42,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1014779686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:42,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:42,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:42,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143189104] [2021-11-23 17:01:42,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:42,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:42,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:42,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:42,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:42,481 INFO L87 Difference]: Start difference. First operand 1621 states and 2729 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:42,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:42,573 INFO L93 Difference]: Finished difference Result 3153 states and 5011 transitions. [2021-11-23 17:01:42,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:42,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:42,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:42,590 INFO L225 Difference]: With dead ends: 3153 [2021-11-23 17:01:42,590 INFO L226 Difference]: Without dead ends: 2315 [2021-11-23 17:01:42,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 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 17:01:42,594 INFO L933 BasicCegarLoop]: 1583 mSDtfsCounter, 1497 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1497 SdHoareTripleChecker+Valid, 1657 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 17:01:42,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1497 Valid, 1657 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:42,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2315 states. [2021-11-23 17:01:42,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2315 to 2313. [2021-11-23 17:01:42,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2313 states, 2311 states have (on average 1.6118563392470793) internal successors, (3725), 2312 states have internal predecessors, (3725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:42,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2313 states to 2313 states and 3725 transitions. [2021-11-23 17:01:42,692 INFO L78 Accepts]: Start accepts. Automaton has 2313 states and 3725 transitions. Word has length 54 [2021-11-23 17:01:42,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:42,692 INFO L470 AbstractCegarLoop]: Abstraction has 2313 states and 3725 transitions. [2021-11-23 17:01:42,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 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 17:01:42,692 INFO L276 IsEmpty]: Start isEmpty. Operand 2313 states and 3725 transitions. [2021-11-23 17:01:42,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:01:42,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:42,693 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, 1] [2021-11-23 17:01:42,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:42,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:42,907 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:42,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:42,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1717241860, now seen corresponding path program 1 times [2021-11-23 17:01:42,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:42,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [356695169] [2021-11-23 17:01:42,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:42,908 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:42,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:42,912 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:42,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:01:42,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:42,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:01:43,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:43,151 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 17:01:43,151 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:43,151 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:43,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [356695169] [2021-11-23 17:01:43,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [356695169] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:43,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:43,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:01:43,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971960720] [2021-11-23 17:01:43,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:43,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:01:43,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:43,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:01:43,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:01:43,154 INFO L87 Difference]: Start difference. First operand 2313 states and 3725 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:43,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:43,417 INFO L93 Difference]: Finished difference Result 3588 states and 5556 transitions. [2021-11-23 17:01:43,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:01:43,418 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 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 55 [2021-11-23 17:01:43,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:43,440 INFO L225 Difference]: With dead ends: 3588 [2021-11-23 17:01:43,440 INFO L226 Difference]: Without dead ends: 3586 [2021-11-23 17:01:43,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:01:43,443 INFO L933 BasicCegarLoop]: 1580 mSDtfsCounter, 186 mSDsluCounter, 4622 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 6202 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:43,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 6202 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:01:43,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3586 states. [2021-11-23 17:01:43,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3586 to 2409. [2021-11-23 17:01:43,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2409 states, 2407 states have (on average 1.58412962193602) internal successors, (3813), 2408 states have internal predecessors, (3813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:43,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2409 states to 2409 states and 3813 transitions. [2021-11-23 17:01:43,619 INFO L78 Accepts]: Start accepts. Automaton has 2409 states and 3813 transitions. Word has length 55 [2021-11-23 17:01:43,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:43,619 INFO L470 AbstractCegarLoop]: Abstraction has 2409 states and 3813 transitions. [2021-11-23 17:01:43,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:43,620 INFO L276 IsEmpty]: Start isEmpty. Operand 2409 states and 3813 transitions. [2021-11-23 17:01:43,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 17:01:43,620 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:43,621 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, 1, 1] [2021-11-23 17:01:43,639 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-23 17:01:43,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:43,836 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:43,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:43,836 INFO L85 PathProgramCache]: Analyzing trace with hash -754642547, now seen corresponding path program 1 times [2021-11-23 17:01:43,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:43,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [902045125] [2021-11-23 17:01:43,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:43,837 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:43,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:43,838 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:43,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:01:43,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:43,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:43,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:44,117 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 17:01:44,117 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:44,117 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:44,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [902045125] [2021-11-23 17:01:44,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [902045125] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:44,118 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:44,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:44,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067679450] [2021-11-23 17:01:44,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:44,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:44,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:44,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:44,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:44,119 INFO L87 Difference]: Start difference. First operand 2409 states and 3813 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:44,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:44,274 INFO L93 Difference]: Finished difference Result 4048 states and 6219 transitions. [2021-11-23 17:01:44,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:44,274 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 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 56 [2021-11-23 17:01:44,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:44,293 INFO L225 Difference]: With dead ends: 4048 [2021-11-23 17:01:44,294 INFO L226 Difference]: Without dead ends: 3133 [2021-11-23 17:01:44,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 54 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 17:01:44,299 INFO L933 BasicCegarLoop]: 1591 mSDtfsCounter, 1498 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1498 SdHoareTripleChecker+Valid, 1661 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 17:01:44,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1498 Valid, 1661 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:44,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3133 states. [2021-11-23 17:01:44,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3133 to 3131. [2021-11-23 17:01:44,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3131 states, 3129 states have (on average 1.5452221156919144) internal successors, (4835), 3130 states have internal predecessors, (4835), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:44,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3131 states to 3131 states and 4835 transitions. [2021-11-23 17:01:44,481 INFO L78 Accepts]: Start accepts. Automaton has 3131 states and 4835 transitions. Word has length 56 [2021-11-23 17:01:44,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:44,481 INFO L470 AbstractCegarLoop]: Abstraction has 3131 states and 4835 transitions. [2021-11-23 17:01:44,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:44,482 INFO L276 IsEmpty]: Start isEmpty. Operand 3131 states and 4835 transitions. [2021-11-23 17:01:44,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:01:44,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:44,482 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, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:44,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:44,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:44,697 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:44,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:44,697 INFO L85 PathProgramCache]: Analyzing trace with hash 238773285, now seen corresponding path program 1 times [2021-11-23 17:01:44,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:44,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1270852604] [2021-11-23 17:01:44,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:44,699 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:44,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:44,700 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:44,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:01:44,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:44,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:44,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:45,046 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 17:01:45,046 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:45,046 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:45,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1270852604] [2021-11-23 17:01:45,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1270852604] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:45,047 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:45,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:01:45,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176463098] [2021-11-23 17:01:45,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:45,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:45,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:45,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:45,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:45,049 INFO L87 Difference]: Start difference. First operand 3131 states and 4835 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:25,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:25,228 INFO L93 Difference]: Finished difference Result 4635 states and 7708 transitions. [2021-11-23 17:02:25,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:25,228 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 0 states have call successors, (0), 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 60 [2021-11-23 17:02:25,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:25,251 INFO L225 Difference]: With dead ends: 4635 [2021-11-23 17:02:25,251 INFO L226 Difference]: Without dead ends: 3882 [2021-11-23 17:02:25,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 58 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 17:02:25,254 INFO L933 BasicCegarLoop]: 641 mSDtfsCounter, 837 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2197 mSolverCounterSat, 664 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 837 SdHoareTripleChecker+Valid, 648 SdHoareTripleChecker+Invalid, 2861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 2197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 39.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:25,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [837 Valid, 648 Invalid, 2861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 2197 Invalid, 0 Unknown, 0 Unchecked, 39.9s Time] [2021-11-23 17:02:25,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3882 states. [2021-11-23 17:02:25,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3882 to 3882. [2021-11-23 17:02:25,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3882 states, 3880 states have (on average 1.479896907216495) internal successors, (5742), 3881 states have internal predecessors, (5742), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:25,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3882 states to 3882 states and 5742 transitions. [2021-11-23 17:02:25,448 INFO L78 Accepts]: Start accepts. Automaton has 3882 states and 5742 transitions. Word has length 60 [2021-11-23 17:02:25,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:25,449 INFO L470 AbstractCegarLoop]: Abstraction has 3882 states and 5742 transitions. [2021-11-23 17:02:25,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:25,449 INFO L276 IsEmpty]: Start isEmpty. Operand 3882 states and 5742 transitions. [2021-11-23 17:02:25,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:02:25,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:25,452 INFO L514 BasicCegarLoop]: trace histogram [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 17:02:25,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:25,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:25,672 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:25,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:25,672 INFO L85 PathProgramCache]: Analyzing trace with hash 457839235, now seen corresponding path program 1 times [2021-11-23 17:02:25,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:25,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [306681169] [2021-11-23 17:02:25,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:25,674 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:25,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:25,675 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:25,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:02:25,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:25,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:02:25,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:26,010 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:26,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:26,010 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:26,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [306681169] [2021-11-23 17:02:26,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [306681169] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:26,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:26,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:02:26,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917157109] [2021-11-23 17:02:26,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:26,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:02:26,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:26,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:02:26,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:02:26,012 INFO L87 Difference]: Start difference. First operand 3882 states and 5742 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 17:02:26,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:26,133 INFO L93 Difference]: Finished difference Result 5544 states and 8151 transitions. [2021-11-23 17:02:26,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:26,133 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 17:02:26,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:26,154 INFO L225 Difference]: With dead ends: 5544 [2021-11-23 17:02:26,154 INFO L226 Difference]: Without dead ends: 3198 [2021-11-23 17:02:26,159 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 17:02:26,159 INFO L933 BasicCegarLoop]: 1572 mSDtfsCounter, 45 mSDsluCounter, 1524 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 3096 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 17:02:26,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 3096 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:02:26,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3198 states. [2021-11-23 17:02:26,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3198 to 3196. [2021-11-23 17:02:26,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3196 states, 3194 states have (on average 1.4902943018159047) internal successors, (4760), 3195 states have internal predecessors, (4760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:26,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3196 states to 3196 states and 4760 transitions. [2021-11-23 17:02:26,382 INFO L78 Accepts]: Start accepts. Automaton has 3196 states and 4760 transitions. Word has length 79 [2021-11-23 17:02:26,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:26,383 INFO L470 AbstractCegarLoop]: Abstraction has 3196 states and 4760 transitions. [2021-11-23 17:02:26,383 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 17:02:26,384 INFO L276 IsEmpty]: Start isEmpty. Operand 3196 states and 4760 transitions. [2021-11-23 17:02:26,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:26,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:26,392 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:26,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:26,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:26,609 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:26,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:26,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1280354104, now seen corresponding path program 1 times [2021-11-23 17:02:26,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:26,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1374910614] [2021-11-23 17:02:26,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:26,610 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:26,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:26,611 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:26,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:02:26,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:26,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:26,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:28,283 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:28,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:29,535 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:29,536 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:29,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1374910614] [2021-11-23 17:02:29,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1374910614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:29,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1551123527] [2021-11-23 17:02:29,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:29,537 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:29,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:29,539 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:29,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:02:29,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:29,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:02:29,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:29,946 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:29,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:29,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1551123527] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:29,947 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:02:29,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:02:29,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551479702] [2021-11-23 17:02:29,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:29,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:02:29,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:29,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:02:29,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:02:29,949 INFO L87 Difference]: Start difference. First operand 3196 states and 4760 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:30,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:30,034 INFO L93 Difference]: Finished difference Result 4016 states and 5938 transitions. [2021-11-23 17:02:30,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:30,035 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 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 17:02:30,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:30,062 INFO L225 Difference]: With dead ends: 4016 [2021-11-23 17:02:30,070 INFO L226 Difference]: Without dead ends: 2382 [2021-11-23 17:02:30,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:02:30,075 INFO L933 BasicCegarLoop]: 1565 mSDtfsCounter, 39 mSDsluCounter, 1516 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 3081 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 17:02:30,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 3081 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:02:30,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2382 states. [2021-11-23 17:02:30,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2382 to 2380. [2021-11-23 17:02:30,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2380 states, 2378 states have (on average 1.5021026072329688) internal successors, (3572), 2379 states have internal predecessors, (3572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:30,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2380 states to 2380 states and 3572 transitions. [2021-11-23 17:02:30,169 INFO L78 Accepts]: Start accepts. Automaton has 2380 states and 3572 transitions. Word has length 81 [2021-11-23 17:02:30,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:30,170 INFO L470 AbstractCegarLoop]: Abstraction has 2380 states and 3572 transitions. [2021-11-23 17:02:30,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:30,170 INFO L276 IsEmpty]: Start isEmpty. Operand 2380 states and 3572 transitions. [2021-11-23 17:02:30,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:30,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:30,172 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:30,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:30,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:30,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:30,587 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:30,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:30,588 INFO L85 PathProgramCache]: Analyzing trace with hash 240841224, now seen corresponding path program 1 times [2021-11-23 17:02:30,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:30,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1781324094] [2021-11-23 17:02:30,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:30,589 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:30,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:30,590 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:30,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:02:30,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:30,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:30,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:31,995 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:31,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:32,967 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:32,968 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:32,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1781324094] [2021-11-23 17:02:32,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1781324094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:32,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1806908186] [2021-11-23 17:02:32,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:32,968 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:32,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:32,969 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:32,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:02:33,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:33,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:02:33,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:33,303 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:33,303 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:33,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1806908186] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:33,303 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:02:33,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:02:33,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579445121] [2021-11-23 17:02:33,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:33,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:02:33,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:33,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:02:33,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:02:33,305 INFO L87 Difference]: Start difference. First operand 2380 states and 3572 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:33,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:33,364 INFO L93 Difference]: Finished difference Result 2792 states and 4156 transitions. [2021-11-23 17:02:33,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:33,365 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 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 17:02:33,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:33,370 INFO L225 Difference]: With dead ends: 2792 [2021-11-23 17:02:33,371 INFO L226 Difference]: Without dead ends: 1974 [2021-11-23 17:02:33,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:02:33,376 INFO L933 BasicCegarLoop]: 1558 mSDtfsCounter, 33 mSDsluCounter, 1508 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 3066 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 17:02:33,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 3066 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:02:33,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-11-23 17:02:33,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1972. [2021-11-23 17:02:33,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1972 states, 1970 states have (on average 1.5147208121827411) internal successors, (2984), 1971 states have internal predecessors, (2984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:33,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1972 states to 1972 states and 2984 transitions. [2021-11-23 17:02:33,473 INFO L78 Accepts]: Start accepts. Automaton has 1972 states and 2984 transitions. Word has length 81 [2021-11-23 17:02:33,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:33,473 INFO L470 AbstractCegarLoop]: Abstraction has 1972 states and 2984 transitions. [2021-11-23 17:02:33,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:33,474 INFO L276 IsEmpty]: Start isEmpty. Operand 1972 states and 2984 transitions. [2021-11-23 17:02:33,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:33,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:33,475 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] [2021-11-23 17:02:33,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:33,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-23 17:02:33,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:33,891 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:33,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:33,891 INFO L85 PathProgramCache]: Analyzing trace with hash -96951918, now seen corresponding path program 1 times [2021-11-23 17:02:33,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:33,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [663464685] [2021-11-23 17:02:33,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:33,892 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:33,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:33,899 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:33,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:02:34,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:34,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:34,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:35,448 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:35,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:36,441 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:36,442 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:36,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [663464685] [2021-11-23 17:02:36,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [663464685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:36,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [340736897] [2021-11-23 17:02:36,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:36,442 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:36,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:36,443 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:36,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:02:36,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:36,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:02:36,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:36,743 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 17:02:36,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:36,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [340736897] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:36,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:02:36,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:02:36,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988194538] [2021-11-23 17:02:36,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:36,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:02:36,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:36,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:02:36,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:02:36,747 INFO L87 Difference]: Start difference. First operand 1972 states and 2984 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:36,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:36,789 INFO L93 Difference]: Finished difference Result 2180 states and 3274 transitions. [2021-11-23 17:02:36,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:36,790 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 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 17:02:36,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:36,795 INFO L225 Difference]: With dead ends: 2180 [2021-11-23 17:02:36,795 INFO L226 Difference]: Without dead ends: 1770 [2021-11-23 17:02:36,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:02:36,798 INFO L933 BasicCegarLoop]: 1551 mSDtfsCounter, 29 mSDsluCounter, 1500 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 3051 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 17:02:36,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 3051 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:02:36,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1770 states. [2021-11-23 17:02:36,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1770 to 1768. [2021-11-23 17:02:36,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1768 states, 1766 states have (on average 1.5249150622876557) internal successors, (2693), 1767 states have internal predecessors, (2693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:36,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1768 states to 1768 states and 2693 transitions. [2021-11-23 17:02:36,846 INFO L78 Accepts]: Start accepts. Automaton has 1768 states and 2693 transitions. Word has length 81 [2021-11-23 17:02:36,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:36,847 INFO L470 AbstractCegarLoop]: Abstraction has 1768 states and 2693 transitions. [2021-11-23 17:02:36,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:36,847 INFO L276 IsEmpty]: Start isEmpty. Operand 1768 states and 2693 transitions. [2021-11-23 17:02:36,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:36,848 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:36,848 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 17:02:36,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:37,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:37,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:37,250 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:37,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:37,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1314937316, now seen corresponding path program 1 times [2021-11-23 17:02:37,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:37,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1766416957] [2021-11-23 17:02:37,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:37,251 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:37,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:37,252 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:37,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:02:37,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:37,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:37,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:38,511 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 17:02:38,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:39,461 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 17:02:39,462 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:39,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1766416957] [2021-11-23 17:02:39,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1766416957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:39,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [506445877] [2021-11-23 17:02:39,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:39,462 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:39,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:39,463 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:39,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 17:02:39,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:39,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:39,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:40,754 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 17:02:40,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:41,413 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 17:02:41,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [506445877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:41,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940004703] [2021-11-23 17:02:41,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:41,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:41,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:41,415 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:41,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 17:02:41,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:41,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:41,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:42,418 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 17:02:42,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:43,092 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 17:02:43,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940004703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:43,092 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:43,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:02:43,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075048773] [2021-11-23 17:02:43,093 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:43,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:02:43,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:43,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:02:43,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:02:43,095 INFO L87 Difference]: Start difference. First operand 1768 states and 2693 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 17:02:43,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:43,430 INFO L93 Difference]: Finished difference Result 2001 states and 3010 transitions. [2021-11-23 17:02:43,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:02:43,431 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 81 [2021-11-23 17:02:43,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:43,435 INFO L225 Difference]: With dead ends: 2001 [2021-11-23 17:02:43,435 INFO L226 Difference]: Without dead ends: 1795 [2021-11-23 17:02:43,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:02:43,439 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 2905 mSDsluCounter, 12275 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2905 SdHoareTripleChecker+Valid, 13796 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:43,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2905 Valid, 13796 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 83 Unchecked, 0.1s Time] [2021-11-23 17:02:43,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1795 states. [2021-11-23 17:02:43,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1795 to 1795. [2021-11-23 17:02:43,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1795 states, 1793 states have (on average 1.5186837702175124) internal successors, (2723), 1794 states have internal predecessors, (2723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:43,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1795 states to 1795 states and 2723 transitions. [2021-11-23 17:02:43,489 INFO L78 Accepts]: Start accepts. Automaton has 1795 states and 2723 transitions. Word has length 81 [2021-11-23 17:02:43,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:43,489 INFO L470 AbstractCegarLoop]: Abstraction has 1795 states and 2723 transitions. [2021-11-23 17:02:43,489 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 17:02:43,490 INFO L276 IsEmpty]: Start isEmpty. Operand 1795 states and 2723 transitions. [2021-11-23 17:02:43,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:43,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:43,491 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 17:02:43,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:43,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:43,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:44,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:44,111 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:44,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:44,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1744570940, now seen corresponding path program 1 times [2021-11-23 17:02:44,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:44,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382934819] [2021-11-23 17:02:44,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:44,112 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:44,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:44,114 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:44,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:02:44,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:44,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:44,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:45,993 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 17:02:45,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:46,641 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 17:02:46,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:46,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382934819] [2021-11-23 17:02:46,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382934819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:46,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [52157206] [2021-11-23 17:02:46,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:46,642 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:46,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:46,647 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:46,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 17:02:46,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:46,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:46,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:48,245 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 17:02:48,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:48,605 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 17:02:48,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [52157206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:48,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642726773] [2021-11-23 17:02:48,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:48,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:48,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:48,609 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:48,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 17:02:48,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:48,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:48,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:50,131 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 17:02:50,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:50,531 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 17:02:50,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642726773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:50,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:50,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:02:50,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865507159] [2021-11-23 17:02:50,532 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:50,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:02:50,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:50,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:02:50,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:02:50,534 INFO L87 Difference]: Start difference. First operand 1795 states and 2723 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 17:02:50,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:50,916 INFO L93 Difference]: Finished difference Result 2017 states and 3029 transitions. [2021-11-23 17:02:50,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:02:50,917 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 81 [2021-11-23 17:02:50,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:50,921 INFO L225 Difference]: With dead ends: 2017 [2021-11-23 17:02:50,922 INFO L226 Difference]: Without dead ends: 1811 [2021-11-23 17:02:50,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:02:50,924 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 7318 mSDsluCounter, 10680 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7318 SdHoareTripleChecker+Valid, 12199 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:50,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7318 Valid, 12199 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 46 Invalid, 0 Unknown, 92 Unchecked, 0.1s Time] [2021-11-23 17:02:50,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1811 states. [2021-11-23 17:02:50,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1811 to 1805. [2021-11-23 17:02:50,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.516916250693289) internal successors, (2735), 1804 states have internal predecessors, (2735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:50,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2735 transitions. [2021-11-23 17:02:50,976 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2735 transitions. Word has length 81 [2021-11-23 17:02:50,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:50,977 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2735 transitions. [2021-11-23 17:02:50,977 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 17:02:50,977 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2735 transitions. [2021-11-23 17:02:50,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:50,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:50,979 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 17:02:50,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:51,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:51,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:51,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:51,594 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:51,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:51,594 INFO L85 PathProgramCache]: Analyzing trace with hash -655405794, now seen corresponding path program 1 times [2021-11-23 17:02:51,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:51,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [754016938] [2021-11-23 17:02:51,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:51,595 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:51,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:51,596 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:51,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:02:51,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:51,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:02:51,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:52,236 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 17:02:52,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:52,237 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:52,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [754016938] [2021-11-23 17:02:52,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [754016938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:52,237 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:52,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:02:52,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072793641] [2021-11-23 17:02:52,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:52,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:02:52,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:52,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:02:52,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:52,238 INFO L87 Difference]: Start difference. First operand 1805 states and 2735 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 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 17:02:52,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:52,361 INFO L93 Difference]: Finished difference Result 2024 states and 3034 transitions. [2021-11-23 17:02:52,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:02:52,361 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 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 17:02:52,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:52,364 INFO L225 Difference]: With dead ends: 2024 [2021-11-23 17:02:52,365 INFO L226 Difference]: Without dead ends: 1805 [2021-11-23 17:02:52,366 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 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 17:02:52,367 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1456 mSDsluCounter, 3115 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1456 SdHoareTripleChecker+Valid, 4641 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:52,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1456 Valid, 4641 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 51 Unchecked, 0.1s Time] [2021-11-23 17:02:52,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1805 states. [2021-11-23 17:02:52,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1805 to 1805. [2021-11-23 17:02:52,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.5163616195230172) internal successors, (2734), 1804 states have internal predecessors, (2734), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:52,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2734 transitions. [2021-11-23 17:02:52,436 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2734 transitions. Word has length 81 [2021-11-23 17:02:52,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:52,436 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2734 transitions. [2021-11-23 17:02:52,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 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 17:02:52,437 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2734 transitions. [2021-11-23 17:02:52,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:52,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:52,438 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 17:02:52,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:52,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:52,653 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:52,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:52,653 INFO L85 PathProgramCache]: Analyzing trace with hash -891290594, now seen corresponding path program 1 times [2021-11-23 17:02:52,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:52,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1658583616] [2021-11-23 17:02:52,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:52,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:52,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:52,655 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:52,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:02:52,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:52,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:02:52,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:53,320 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 17:02:53,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:53,320 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:53,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1658583616] [2021-11-23 17:02:53,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1658583616] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:53,321 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:53,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:02:53,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693818111] [2021-11-23 17:02:53,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:53,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:02:53,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:53,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:02:53,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:53,323 INFO L87 Difference]: Start difference. First operand 1805 states and 2734 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 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 17:02:53,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:53,443 INFO L93 Difference]: Finished difference Result 2028 states and 3038 transitions. [2021-11-23 17:02:53,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:02:53,444 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 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 17:02:53,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:53,448 INFO L225 Difference]: With dead ends: 2028 [2021-11-23 17:02:53,449 INFO L226 Difference]: Without dead ends: 1805 [2021-11-23 17:02:53,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 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 17:02:53,451 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 2910 mSDsluCounter, 2979 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2910 SdHoareTripleChecker+Valid, 4508 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 17:02:53,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2910 Valid, 4508 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 15 Unchecked, 0.0s Time] [2021-11-23 17:02:53,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1805 states. [2021-11-23 17:02:53,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1805 to 1805. [2021-11-23 17:02:53,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.5158069883527454) internal successors, (2733), 1804 states have internal predecessors, (2733), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:53,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2733 transitions. [2021-11-23 17:02:53,501 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2733 transitions. Word has length 81 [2021-11-23 17:02:53,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:53,502 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2733 transitions. [2021-11-23 17:02:53,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 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 17:02:53,502 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2733 transitions. [2021-11-23 17:02:53,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:53,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:53,504 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 17:02:53,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:53,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:53,719 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:53,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:53,719 INFO L85 PathProgramCache]: Analyzing trace with hash -421450978, now seen corresponding path program 1 times [2021-11-23 17:02:53,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:53,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [790159040] [2021-11-23 17:02:53,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:53,720 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:53,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:53,721 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:53,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:02:53,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:53,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:02:53,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:54,444 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 17:02:54,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:54,445 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:54,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [790159040] [2021-11-23 17:02:54,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [790159040] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:54,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:54,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:02:54,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756798605] [2021-11-23 17:02:54,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:54,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:02:54,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:54,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:02:54,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:54,447 INFO L87 Difference]: Start difference. First operand 1805 states and 2733 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:54,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:54,504 INFO L93 Difference]: Finished difference Result 2032 states and 3042 transitions. [2021-11-23 17:02:54,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:02:54,505 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:02:54,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:54,507 INFO L225 Difference]: With dead ends: 2032 [2021-11-23 17:02:54,508 INFO L226 Difference]: Without dead ends: 1805 [2021-11-23 17:02:54,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:54,509 INFO L933 BasicCegarLoop]: 1533 mSDtfsCounter, 2900 mSDsluCounter, 1579 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2900 SdHoareTripleChecker+Valid, 3112 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:54,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2900 Valid, 3112 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:02:54,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1805 states. [2021-11-23 17:02:54,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1805 to 1805. [2021-11-23 17:02:54,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.5152523571824736) internal successors, (2732), 1804 states have internal predecessors, (2732), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:54,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2732 transitions. [2021-11-23 17:02:54,561 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2732 transitions. Word has length 81 [2021-11-23 17:02:54,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:54,562 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2732 transitions. [2021-11-23 17:02:54,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:54,562 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2732 transitions. [2021-11-23 17:02:54,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:02:54,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:54,564 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 17:02:54,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:54,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:54,775 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:54,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:54,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1330456034, now seen corresponding path program 1 times [2021-11-23 17:02:54,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:54,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2004774830] [2021-11-23 17:02:54,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:54,776 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:54,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:54,777 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:54,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:02:54,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:54,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:02:54,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:55,378 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 17:02:55,379 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:55,379 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:55,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2004774830] [2021-11-23 17:02:55,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2004774830] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:55,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:55,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:02:55,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605715979] [2021-11-23 17:02:55,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:55,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:02:55,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:55,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:02:55,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:55,381 INFO L87 Difference]: Start difference. First operand 1805 states and 2732 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 17:02:55,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:55,503 INFO L93 Difference]: Finished difference Result 2011 states and 3018 transitions. [2021-11-23 17:02:55,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:02:55,503 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 81 [2021-11-23 17:02:55,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:55,506 INFO L225 Difference]: With dead ends: 2011 [2021-11-23 17:02:55,506 INFO L226 Difference]: Without dead ends: 1780 [2021-11-23 17:02:55,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 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 17:02:55,508 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 2917 mSDsluCounter, 2960 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2917 SdHoareTripleChecker+Valid, 4495 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:55,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2917 Valid, 4495 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 11 Unchecked, 0.1s Time] [2021-11-23 17:02:55,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1780 states. [2021-11-23 17:02:55,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1780 to 1780. [2021-11-23 17:02:55,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1780 states, 1778 states have (on average 1.5202474690663668) internal successors, (2703), 1779 states have internal predecessors, (2703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:55,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1780 states to 1780 states and 2703 transitions. [2021-11-23 17:02:55,560 INFO L78 Accepts]: Start accepts. Automaton has 1780 states and 2703 transitions. Word has length 81 [2021-11-23 17:02:55,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:55,561 INFO L470 AbstractCegarLoop]: Abstraction has 1780 states and 2703 transitions. [2021-11-23 17:02:55,561 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 17:02:55,561 INFO L276 IsEmpty]: Start isEmpty. Operand 1780 states and 2703 transitions. [2021-11-23 17:02:55,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:02:55,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:55,563 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 17:02:55,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:55,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:55,778 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:55,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:55,778 INFO L85 PathProgramCache]: Analyzing trace with hash 1524871731, now seen corresponding path program 1 times [2021-11-23 17:02:55,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:55,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260215321] [2021-11-23 17:02:55,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:55,779 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:55,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:55,780 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:55,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:02:55,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:55,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:55,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:57,442 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 17:02:57,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:58,170 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 17:02:58,171 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:58,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [260215321] [2021-11-23 17:02:58,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [260215321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:58,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [987327598] [2021-11-23 17:02:58,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:58,171 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:58,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:58,175 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:58,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:02:58,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:58,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:58,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:59,943 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 17:02:59,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:00,447 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 17:03:00,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [987327598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:00,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730187019] [2021-11-23 17:03:00,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:00,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:00,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:00,448 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:00,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 17:03:00,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:00,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:03:00,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:01,955 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 17:03:01,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:02,431 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 17:03:02,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730187019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:02,431 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:02,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:03:02,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130765038] [2021-11-23 17:03:02,432 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:02,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:03:02,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:02,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:03:02,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:03:02,433 INFO L87 Difference]: Start difference. First operand 1780 states and 2703 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 17:03:02,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:02,709 INFO L93 Difference]: Finished difference Result 1998 states and 3007 transitions. [2021-11-23 17:03:02,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:03:02,710 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 82 [2021-11-23 17:03:02,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:02,713 INFO L225 Difference]: With dead ends: 1998 [2021-11-23 17:03:02,713 INFO L226 Difference]: Without dead ends: 1792 [2021-11-23 17:03:02,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:03:02,715 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 5853 mSDsluCounter, 10673 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5853 SdHoareTripleChecker+Valid, 12194 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:02,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5853 Valid, 12194 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 84 Unchecked, 0.1s Time] [2021-11-23 17:03:02,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1792 states. [2021-11-23 17:03:02,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1792 to 1792. [2021-11-23 17:03:02,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1792 states, 1790 states have (on average 1.5189944134078213) internal successors, (2719), 1791 states have internal predecessors, (2719), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:02,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1792 states to 1792 states and 2719 transitions. [2021-11-23 17:03:02,763 INFO L78 Accepts]: Start accepts. Automaton has 1792 states and 2719 transitions. Word has length 82 [2021-11-23 17:03:02,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:02,763 INFO L470 AbstractCegarLoop]: Abstraction has 1792 states and 2719 transitions. [2021-11-23 17:03:02,764 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 17:03:02,764 INFO L276 IsEmpty]: Start isEmpty. Operand 1792 states and 2719 transitions. [2021-11-23 17:03:02,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:03:02,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:02,765 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 17:03:02,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:02,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:03,188 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-23 17:03:03,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:03,387 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:03,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:03,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1294691885, now seen corresponding path program 1 times [2021-11-23 17:03:03,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:03,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [243271451] [2021-11-23 17:03:03,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:03,388 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:03,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:03,389 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:03,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:03:03,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:03,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:03:03,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:05,233 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 17:03:05,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:05,992 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 17:03:05,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [243271451] [2021-11-23 17:03:05,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [243271451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1738795404] [2021-11-23 17:03:05,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:05,994 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:05,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:06,009 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:06,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:03:06,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:06,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:03:06,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:07,614 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 17:03:07,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:08,240 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 17:03:08,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1738795404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:08,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205282713] [2021-11-23 17:03:08,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:08,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:08,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:08,241 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:08,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 17:03:08,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:08,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:03:08,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:09,731 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 17:03:09,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:10,360 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 17:03:10,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205282713] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:10,361 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:10,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:03:10,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812596497] [2021-11-23 17:03:10,361 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:10,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:03:10,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:10,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:03:10,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:03:10,363 INFO L87 Difference]: Start difference. First operand 1792 states and 2719 transitions. Second operand has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:10,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:10,728 INFO L93 Difference]: Finished difference Result 2010 states and 3023 transitions. [2021-11-23 17:03:10,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:03:10,731 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 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 17:03:10,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:10,735 INFO L225 Difference]: With dead ends: 2010 [2021-11-23 17:03:10,736 INFO L226 Difference]: Without dead ends: 1804 [2021-11-23 17:03:10,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:03:10,738 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 7343 mSDsluCounter, 10582 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7343 SdHoareTripleChecker+Valid, 12101 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:10,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7343 Valid, 12101 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 65 Unchecked, 0.1s Time] [2021-11-23 17:03:10,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1804 states. [2021-11-23 17:03:10,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1804 to 1804. [2021-11-23 17:03:10,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1804 states, 1802 states have (on average 1.5177580466148723) internal successors, (2735), 1803 states have internal predecessors, (2735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:10,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1804 states to 1804 states and 2735 transitions. [2021-11-23 17:03:10,793 INFO L78 Accepts]: Start accepts. Automaton has 1804 states and 2735 transitions. Word has length 83 [2021-11-23 17:03:10,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:10,794 INFO L470 AbstractCegarLoop]: Abstraction has 1804 states and 2735 transitions. [2021-11-23 17:03:10,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:10,794 INFO L276 IsEmpty]: Start isEmpty. Operand 1804 states and 2735 transitions. [2021-11-23 17:03:10,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:03:10,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:10,795 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 17:03:10,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:11,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:11,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 17:03:11,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:11,410 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:11,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:11,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1031414378, now seen corresponding path program 1 times [2021-11-23 17:03:11,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:11,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [21444523] [2021-11-23 17:03:11,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:11,411 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:11,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:11,412 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:11,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:03:11,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:11,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:03:11,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:12,406 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 17:03:12,407 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:03:12,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:12,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [21444523] [2021-11-23 17:03:12,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [21444523] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:03:12,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:03:12,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:03:12,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542866955] [2021-11-23 17:03:12,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:03:12,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:03:12,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:12,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:03:12,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:03:12,409 INFO L87 Difference]: Start difference. First operand 1804 states and 2735 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 17:03:12,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:12,572 INFO L93 Difference]: Finished difference Result 2168 states and 3235 transitions. [2021-11-23 17:03:12,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:03:12,573 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 84 [2021-11-23 17:03:12,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:12,577 INFO L225 Difference]: With dead ends: 2168 [2021-11-23 17:03:12,577 INFO L226 Difference]: Without dead ends: 1962 [2021-11-23 17:03:12,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 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 17:03:12,579 INFO L933 BasicCegarLoop]: 1611 mSDtfsCounter, 3189 mSDsluCounter, 1725 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3189 SdHoareTripleChecker+Valid, 3336 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:12,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3189 Valid, 3336 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:03:12,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1962 states. [2021-11-23 17:03:12,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1962 to 1804. [2021-11-23 17:03:12,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1804 states, 1802 states have (on average 1.5144284128745837) internal successors, (2729), 1803 states have internal predecessors, (2729), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:12,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1804 states to 1804 states and 2729 transitions. [2021-11-23 17:03:12,634 INFO L78 Accepts]: Start accepts. Automaton has 1804 states and 2729 transitions. Word has length 84 [2021-11-23 17:03:12,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:12,635 INFO L470 AbstractCegarLoop]: Abstraction has 1804 states and 2729 transitions. [2021-11-23 17:03:12,635 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 17:03:12,636 INFO L276 IsEmpty]: Start isEmpty. Operand 1804 states and 2729 transitions. [2021-11-23 17:03:12,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:03:12,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:12,637 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 17:03:12,655 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-23 17:03:12,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:12,852 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:12,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:12,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1761193811, now seen corresponding path program 1 times [2021-11-23 17:03:12,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:12,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2000398911] [2021-11-23 17:03:12,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:12,853 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:12,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:12,854 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:12,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:03:12,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:12,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:03:12,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:13,911 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 17:03:13,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:03:13,912 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:13,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2000398911] [2021-11-23 17:03:13,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2000398911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:03:13,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:03:13,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:03:13,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351250508] [2021-11-23 17:03:13,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:03:13,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:03:13,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:13,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:03:13,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:03:13,914 INFO L87 Difference]: Start difference. First operand 1804 states and 2729 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:14,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:14,092 INFO L93 Difference]: Finished difference Result 2100 states and 3138 transitions. [2021-11-23 17:03:14,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:03:14,092 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 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 17:03:14,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:14,098 INFO L225 Difference]: With dead ends: 2100 [2021-11-23 17:03:14,098 INFO L226 Difference]: Without dead ends: 2030 [2021-11-23 17:03:14,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 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 17:03:14,100 INFO L933 BasicCegarLoop]: 1618 mSDtfsCounter, 1790 mSDsluCounter, 1786 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1790 SdHoareTripleChecker+Valid, 3404 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:14,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1790 Valid, 3404 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:03:14,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2030 states. [2021-11-23 17:03:14,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2030 to 1876. [2021-11-23 17:03:14,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1876 states, 1874 states have (on average 1.5069370330843117) internal successors, (2824), 1875 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:14,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1876 states to 1876 states and 2824 transitions. [2021-11-23 17:03:14,162 INFO L78 Accepts]: Start accepts. Automaton has 1876 states and 2824 transitions. Word has length 84 [2021-11-23 17:03:14,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:14,163 INFO L470 AbstractCegarLoop]: Abstraction has 1876 states and 2824 transitions. [2021-11-23 17:03:14,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:14,163 INFO L276 IsEmpty]: Start isEmpty. Operand 1876 states and 2824 transitions. [2021-11-23 17:03:14,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:03:14,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:14,164 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 17:03:14,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:14,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:14,380 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:14,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:14,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1178309706, now seen corresponding path program 1 times [2021-11-23 17:03:14,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:14,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1632274876] [2021-11-23 17:03:14,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:14,381 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:14,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:14,383 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:14,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:03:14,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:14,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:03:14,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:15,534 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 17:03:15,534 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:03:15,534 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:15,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1632274876] [2021-11-23 17:03:15,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1632274876] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:03:15,535 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:03:15,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:03:15,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707941132] [2021-11-23 17:03:15,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:03:15,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:03:15,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:15,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:03:15,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:03:15,536 INFO L87 Difference]: Start difference. First operand 1876 states and 2824 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:15,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:15,699 INFO L93 Difference]: Finished difference Result 2172 states and 3233 transitions. [2021-11-23 17:03:15,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:03:15,700 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 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 17:03:15,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:15,703 INFO L225 Difference]: With dead ends: 2172 [2021-11-23 17:03:15,703 INFO L226 Difference]: Without dead ends: 2102 [2021-11-23 17:03:15,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 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 17:03:15,705 INFO L933 BasicCegarLoop]: 1626 mSDtfsCounter, 3184 mSDsluCounter, 1769 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3184 SdHoareTripleChecker+Valid, 3395 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:15,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3184 Valid, 3395 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:03:15,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2102 states. [2021-11-23 17:03:15,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2102 to 1954. [2021-11-23 17:03:15,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1954 states, 1952 states have (on average 1.4994877049180328) internal successors, (2927), 1953 states have internal predecessors, (2927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:15,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 2927 transitions. [2021-11-23 17:03:15,776 INFO L78 Accepts]: Start accepts. Automaton has 1954 states and 2927 transitions. Word has length 84 [2021-11-23 17:03:15,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:15,776 INFO L470 AbstractCegarLoop]: Abstraction has 1954 states and 2927 transitions. [2021-11-23 17:03:15,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:15,777 INFO L276 IsEmpty]: Start isEmpty. Operand 1954 states and 2927 transitions. [2021-11-23 17:03:15,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:03:15,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:15,778 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 17:03:15,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:15,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:15,994 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:15,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:15,995 INFO L85 PathProgramCache]: Analyzing trace with hash 817957581, now seen corresponding path program 1 times [2021-11-23 17:03:15,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:15,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1644512402] [2021-11-23 17:03:15,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:15,995 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:15,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:15,996 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:15,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:03:16,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:16,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:03:16,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:17,006 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 17:03:17,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:03:17,007 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:17,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1644512402] [2021-11-23 17:03:17,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1644512402] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:03:17,007 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:03:17,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:03:17,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107251282] [2021-11-23 17:03:17,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:03:17,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:03:17,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:17,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:03:17,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:03:17,008 INFO L87 Difference]: Start difference. First operand 1954 states and 2927 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:17,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:17,203 INFO L93 Difference]: Finished difference Result 2250 states and 3336 transitions. [2021-11-23 17:03:17,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:03:17,204 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 0 states have call successors, (0), 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 17:03:17,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:17,212 INFO L225 Difference]: With dead ends: 2250 [2021-11-23 17:03:17,213 INFO L226 Difference]: Without dead ends: 2180 [2021-11-23 17:03:17,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 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 17:03:17,215 INFO L933 BasicCegarLoop]: 1614 mSDtfsCounter, 1766 mSDsluCounter, 1815 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1766 SdHoareTripleChecker+Valid, 3429 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:17,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1766 Valid, 3429 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:03:17,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2180 states. [2021-11-23 17:03:17,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2180 to 2032. [2021-11-23 17:03:17,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2032 states, 2030 states have (on average 1.4926108374384237) internal successors, (3030), 2031 states have internal predecessors, (3030), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:17,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2032 states to 2032 states and 3030 transitions. [2021-11-23 17:03:17,288 INFO L78 Accepts]: Start accepts. Automaton has 2032 states and 3030 transitions. Word has length 84 [2021-11-23 17:03:17,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:17,288 INFO L470 AbstractCegarLoop]: Abstraction has 2032 states and 3030 transitions. [2021-11-23 17:03:17,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:17,289 INFO L276 IsEmpty]: Start isEmpty. Operand 2032 states and 3030 transitions. [2021-11-23 17:03:17,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:03:17,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:17,290 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, 1] [2021-11-23 17:03:17,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:17,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:17,506 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:17,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:17,506 INFO L85 PathProgramCache]: Analyzing trace with hash -260780419, now seen corresponding path program 1 times [2021-11-23 17:03:17,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:17,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [88297745] [2021-11-23 17:03:17,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:17,507 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:17,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:17,508 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:17,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:03:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:17,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:03:17,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:24,407 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 17:03:24,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:28,401 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 17:03:28,401 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:28,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [88297745] [2021-11-23 17:03:28,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [88297745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:28,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [519545425] [2021-11-23 17:03:28,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:28,402 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:28,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:28,403 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:28,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 17:03:28,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:28,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:03:28,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:33,290 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 17:03:33,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:35,289 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 17:03:35,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [519545425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:35,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331588800] [2021-11-23 17:03:35,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:35,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:35,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:35,291 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:35,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 17:03:35,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:35,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:03:35,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:46,052 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 17:03:46,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:48,858 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 17:03:48,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331588800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:48,858 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:48,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 15, 15, 28, 25] total 94 [2021-11-23 17:03:48,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106084323] [2021-11-23 17:03:48,859 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:48,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-23 17:03:48,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:48,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-23 17:03:48,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1137, Invalid=7605, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 17:03:48,864 INFO L87 Difference]: Start difference. First operand 2032 states and 3030 transitions. Second operand has 94 states, 94 states have (on average 3.6382978723404253) internal successors, (342), 94 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:53,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:53,516 INFO L93 Difference]: Finished difference Result 2361 states and 3451 transitions. [2021-11-23 17:03:53,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:03:53,516 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 3.6382978723404253) internal successors, (342), 94 states have internal predecessors, (342), 0 states have call successors, (0), 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 17:03:53,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:53,520 INFO L225 Difference]: With dead ends: 2361 [2021-11-23 17:03:53,520 INFO L226 Difference]: Without dead ends: 2219 [2021-11-23 17:03:53,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 423 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4902 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=1563, Invalid=10647, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 17:03:53,525 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 6115 mSDsluCounter, 30953 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6115 SdHoareTripleChecker+Valid, 32491 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 207 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:53,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6115 Valid, 32491 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 403 Invalid, 0 Unknown, 207 Unchecked, 0.8s Time] [2021-11-23 17:03:53,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2219 states. [2021-11-23 17:03:53,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2219 to 2043. [2021-11-23 17:03:53,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2043 states, 2041 states have (on average 1.4909358157765802) internal successors, (3043), 2042 states have internal predecessors, (3043), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:53,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2043 states to 2043 states and 3043 transitions. [2021-11-23 17:03:53,598 INFO L78 Accepts]: Start accepts. Automaton has 2043 states and 3043 transitions. Word has length 85 [2021-11-23 17:03:53,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:53,599 INFO L470 AbstractCegarLoop]: Abstraction has 2043 states and 3043 transitions. [2021-11-23 17:03:53,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 3.6382978723404253) internal successors, (342), 94 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:53,599 INFO L276 IsEmpty]: Start isEmpty. Operand 2043 states and 3043 transitions. [2021-11-23 17:03:53,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:03:53,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:53,601 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, 1] [2021-11-23 17:03:53,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:53,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-11-23 17:03:54,013 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 17:03:54,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:54,204 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:54,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:54,204 INFO L85 PathProgramCache]: Analyzing trace with hash 669515392, now seen corresponding path program 1 times [2021-11-23 17:03:54,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:54,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1572416209] [2021-11-23 17:03:54,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:54,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:54,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:54,211 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:54,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:03:54,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:54,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:03:54,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:56,429 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 17:03:56,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:56,992 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 17:03:56,992 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:56,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1572416209] [2021-11-23 17:03:56,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1572416209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:56,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1720025089] [2021-11-23 17:03:56,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:56,993 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:56,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:56,993 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:56,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:03:57,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:57,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:03:57,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:07,937 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 17:04:07,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:14,719 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 17:04:14,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1720025089] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:14,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742710832] [2021-11-23 17:04:14,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:14,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:14,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:14,720 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:14,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:04:14,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:14,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:04:14,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:25,659 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 17:04:25,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:27,114 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 17:04:27,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742710832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:27,114 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:27,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 29, 24, 28, 24] total 83 [2021-11-23 17:04:27,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546078605] [2021-11-23 17:04:27,115 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:27,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 17:04:27,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:27,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 17:04:27,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=6125, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:04:27,120 INFO L87 Difference]: Start difference. First operand 2043 states and 3043 transitions. Second operand has 83 states, 83 states have (on average 4.180722891566265) internal successors, (347), 83 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:33,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:33,182 INFO L93 Difference]: Finished difference Result 2396 states and 3488 transitions. [2021-11-23 17:04:33,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:04:33,183 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 4.180722891566265) internal successors, (347), 83 states have internal predecessors, (347), 0 states have call successors, (0), 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 17:04:33,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:33,190 INFO L225 Difference]: With dead ends: 2396 [2021-11-23 17:04:33,190 INFO L226 Difference]: Without dead ends: 2244 [2021-11-23 17:04:33,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 431 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2991 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=1022, Invalid=8878, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:04:33,195 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 13247 mSDsluCounter, 41249 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13247 SdHoareTripleChecker+Valid, 42790 SdHoareTripleChecker+Invalid, 698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 296 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:33,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13247 Valid, 42790 Invalid, 698 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [17 Valid, 385 Invalid, 0 Unknown, 296 Unchecked, 0.7s Time] [2021-11-23 17:04:33,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2244 states. [2021-11-23 17:04:33,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2244 to 2044. [2021-11-23 17:04:33,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2044 states, 2042 states have (on average 1.4906953966699314) internal successors, (3044), 2043 states have internal predecessors, (3044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:33,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2044 states to 2044 states and 3044 transitions. [2021-11-23 17:04:33,269 INFO L78 Accepts]: Start accepts. Automaton has 2044 states and 3044 transitions. Word has length 85 [2021-11-23 17:04:33,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:33,270 INFO L470 AbstractCegarLoop]: Abstraction has 2044 states and 3044 transitions. [2021-11-23 17:04:33,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 4.180722891566265) internal successors, (347), 83 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:33,270 INFO L276 IsEmpty]: Start isEmpty. Operand 2044 states and 3044 transitions. [2021-11-23 17:04:33,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:04:33,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:33,272 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, 1] [2021-11-23 17:04:33,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:33,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:33,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:33,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:33,883 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:33,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:33,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1911465891, now seen corresponding path program 1 times [2021-11-23 17:04:33,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:33,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [942514753] [2021-11-23 17:04:33,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:33,884 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:33,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:33,885 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:33,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:04:33,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:33,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:04:33,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:36,828 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 17:04:36,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:37,862 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 17:04:37,863 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:37,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [942514753] [2021-11-23 17:04:37,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [942514753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:37,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1225033118] [2021-11-23 17:04:37,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:37,863 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:37,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:37,866 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:37,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:04:38,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:38,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:04:38,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:40,794 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 17:04:40,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:41,311 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 17:04:41,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1225033118] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:41,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560950005] [2021-11-23 17:04:41,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:41,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:41,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:41,326 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:41,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:04:41,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:41,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:04:41,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:48,342 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 17:04:48,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:52,873 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 17:04:52,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560950005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:52,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:52,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 17, 14, 25, 24] total 71 [2021-11-23 17:04:52,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079353094] [2021-11-23 17:04:52,874 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:52,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:04:52,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:52,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:04:52,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=4177, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:04:52,878 INFO L87 Difference]: Start difference. First operand 2044 states and 3044 transitions. Second operand has 71 states, 71 states have (on average 3.816901408450704) internal successors, (271), 71 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:55,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:55,062 INFO L93 Difference]: Finished difference Result 2395 states and 3484 transitions. [2021-11-23 17:04:55,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:04:55,063 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.816901408450704) internal successors, (271), 71 states have internal predecessors, (271), 0 states have call successors, (0), 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 17:04:55,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:55,065 INFO L225 Difference]: With dead ends: 2395 [2021-11-23 17:04:55,066 INFO L226 Difference]: Without dead ends: 2231 [2021-11-23 17:04:55,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 437 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2071 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=929, Invalid=4621, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:04:55,069 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 21809 mSDsluCounter, 24837 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21809 SdHoareTripleChecker+Valid, 26379 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:55,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21809 Valid, 26379 Invalid, 737 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [28 Valid, 576 Invalid, 0 Unknown, 133 Unchecked, 1.1s Time] [2021-11-23 17:04:55,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2231 states. [2021-11-23 17:04:55,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2231 to 2022. [2021-11-23 17:04:55,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2022 states, 2020 states have (on average 1.4925742574257426) internal successors, (3015), 2021 states have internal predecessors, (3015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:55,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2022 states to 2022 states and 3015 transitions. [2021-11-23 17:04:55,132 INFO L78 Accepts]: Start accepts. Automaton has 2022 states and 3015 transitions. Word has length 85 [2021-11-23 17:04:55,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:55,132 INFO L470 AbstractCegarLoop]: Abstraction has 2022 states and 3015 transitions. [2021-11-23 17:04:55,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.816901408450704) internal successors, (271), 71 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:55,133 INFO L276 IsEmpty]: Start isEmpty. Operand 2022 states and 3015 transitions. [2021-11-23 17:04:55,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:04:55,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:55,134 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, 1, 1, 1] [2021-11-23 17:04:55,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:55,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:55,555 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-23 17:04:55,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:55,747 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:55,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:55,747 INFO L85 PathProgramCache]: Analyzing trace with hash -737842279, now seen corresponding path program 1 times [2021-11-23 17:04:55,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:55,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [328026614] [2021-11-23 17:04:55,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:55,748 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:55,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:55,749 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:55,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:04:55,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:55,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:04:55,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:56,208 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 17:04:56,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:56,512 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 17:04:56,513 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:56,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [328026614] [2021-11-23 17:04:56,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [328026614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:56,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [778034435] [2021-11-23 17:04:56,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:56,514 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:56,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:56,514 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:56,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:04:56,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:56,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:56,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:57,070 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 17:04:57,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:57,381 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 17:04:57,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [778034435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:57,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046281329] [2021-11-23 17:04:57,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:57,383 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:57,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:57,387 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:57,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:04:57,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:57,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:57,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:57,852 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 17:04:57,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:58,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:58,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046281329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:58,343 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:58,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:04:58,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480240663] [2021-11-23 17:04:58,343 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:58,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:04:58,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:58,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:04:58,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:04:58,345 INFO L87 Difference]: Start difference. First operand 2022 states and 3015 transitions. Second operand has 7 states, 7 states have (on average 29.857142857142858) internal successors, (209), 7 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:58,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:58,515 INFO L93 Difference]: Finished difference Result 3161 states and 4520 transitions. [2021-11-23 17:04:58,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:04:58,516 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 29.857142857142858) internal successors, (209), 7 states have internal predecessors, (209), 0 states have call successors, (0), 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 86 [2021-11-23 17:04:58,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:58,518 INFO L225 Difference]: With dead ends: 3161 [2021-11-23 17:04:58,519 INFO L226 Difference]: Without dead ends: 2751 [2021-11-23 17:04:58,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 503 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:04:58,521 INFO L933 BasicCegarLoop]: 1568 mSDtfsCounter, 3126 mSDsluCounter, 1926 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3126 SdHoareTripleChecker+Valid, 3494 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:58,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3126 Valid, 3494 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 33 Invalid, 0 Unknown, 12 Unchecked, 0.1s Time] [2021-11-23 17:04:58,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2751 states. [2021-11-23 17:04:58,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2751 to 2643. [2021-11-23 17:04:58,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2643 states, 2641 states have (on average 1.4468004543733435) internal successors, (3821), 2642 states have internal predecessors, (3821), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:58,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2643 states to 2643 states and 3821 transitions. [2021-11-23 17:04:58,603 INFO L78 Accepts]: Start accepts. Automaton has 2643 states and 3821 transitions. Word has length 86 [2021-11-23 17:04:58,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:58,603 INFO L470 AbstractCegarLoop]: Abstraction has 2643 states and 3821 transitions. [2021-11-23 17:04:58,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 29.857142857142858) internal successors, (209), 7 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:58,603 INFO L276 IsEmpty]: Start isEmpty. Operand 2643 states and 3821 transitions. [2021-11-23 17:04:58,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:04:58,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:58,604 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, 1] [2021-11-23 17:04:58,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:58,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2021-11-23 17:04:59,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:59,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:59,207 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:59,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:59,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1997534658, now seen corresponding path program 1 times [2021-11-23 17:04:59,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:59,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [110528407] [2021-11-23 17:04:59,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:59,208 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:59,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:59,209 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:59,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:04:59,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:59,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:04:59,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:11,033 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 17:05:11,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:19,422 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 17:05:19,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:19,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [110528407] [2021-11-23 17:05:19,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [110528407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:19,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1544383973] [2021-11-23 17:05:19,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:19,422 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:19,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:05:19,423 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:05:19,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:05:19,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:19,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:05:19,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:34,552 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 17:05:34,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:38,068 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 17:05:38,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1544383973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:38,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138640593] [2021-11-23 17:05:38,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:38,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:38,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:38,069 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:05:38,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:05:38,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:38,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:05:38,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:43,535 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 17:05:43,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:45,081 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 17:05:45,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138640593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:45,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:05:45,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 29, 24, 29, 24] total 68 [2021-11-23 17:05:45,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236178464] [2021-11-23 17:05:45,082 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:05:45,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:05:45,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:45,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:05:45,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:05:45,086 INFO L87 Difference]: Start difference. First operand 2643 states and 3821 transitions. Second operand has 68 states, 68 states have (on average 3.2058823529411766) internal successors, (218), 68 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:05:46,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:46,526 INFO L93 Difference]: Finished difference Result 2966 states and 4251 transitions. [2021-11-23 17:05:46,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:05:46,526 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.2058823529411766) internal successors, (218), 68 states have internal predecessors, (218), 0 states have call successors, (0), 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 86 [2021-11-23 17:05:46,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:46,529 INFO L225 Difference]: With dead ends: 2966 [2021-11-23 17:05:46,529 INFO L226 Difference]: Without dead ends: 2649 [2021-11-23 17:05:46,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 444 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1728 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=557, Invalid=4273, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:05:46,533 INFO L933 BasicCegarLoop]: 1508 mSDtfsCounter, 3076 mSDsluCounter, 33000 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3076 SdHoareTripleChecker+Valid, 34508 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 223 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:46,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3076 Valid, 34508 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 177 Invalid, 0 Unknown, 223 Unchecked, 0.4s Time] [2021-11-23 17:05:46,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2649 states. [2021-11-23 17:05:46,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2649 to 2649. [2021-11-23 17:05:46,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2649 states, 2647 states have (on average 1.4461654703437854) internal successors, (3828), 2648 states have internal predecessors, (3828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:05:46,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2649 states to 2649 states and 3828 transitions. [2021-11-23 17:05:46,620 INFO L78 Accepts]: Start accepts. Automaton has 2649 states and 3828 transitions. Word has length 86 [2021-11-23 17:05:46,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:46,620 INFO L470 AbstractCegarLoop]: Abstraction has 2649 states and 3828 transitions. [2021-11-23 17:05:46,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.2058823529411766) internal successors, (218), 68 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:05:46,621 INFO L276 IsEmpty]: Start isEmpty. Operand 2649 states and 3828 transitions. [2021-11-23 17:05:46,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:05:46,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:46,622 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, 1, 1] [2021-11-23 17:05:46,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:46,836 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:05:47,028 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 17:05:47,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:47,227 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:47,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:47,227 INFO L85 PathProgramCache]: Analyzing trace with hash 587604453, now seen corresponding path program 1 times [2021-11-23 17:05:47,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:47,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [818356048] [2021-11-23 17:05:47,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:47,228 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:47,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:47,230 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:47,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:05:47,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:47,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:05:47,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:51,098 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 17:05:51,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:52,580 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 17:05:52,581 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:52,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [818356048] [2021-11-23 17:05:52,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [818356048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:52,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1414070151] [2021-11-23 17:05:52,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:52,583 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:52,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:05:52,583 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:05:52,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:05:52,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:52,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:05:52,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:57,149 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 17:05:57,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:57,845 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 17:05:57,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1414070151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:57,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343315558] [2021-11-23 17:05:57,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:57,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:57,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:57,847 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:05:57,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:05:57,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:57,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:05:57,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:00,440 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 17:06:00,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:01,386 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 17:06:01,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343315558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:01,386 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:06:01,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 18, 13, 10, 9] total 57 [2021-11-23 17:06:01,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431957857] [2021-11-23 17:06:01,387 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:06:01,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-23 17:06:01,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:01,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-23 17:06:01,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=2831, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:06:01,390 INFO L87 Difference]: Start difference. First operand 2649 states and 3828 transitions. Second operand has 57 states, 57 states have (on average 6.298245614035087) internal successors, (359), 57 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:02,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:02,257 INFO L93 Difference]: Finished difference Result 3324 states and 4688 transitions. [2021-11-23 17:06:02,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:06:02,257 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 6.298245614035087) internal successors, (359), 57 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:06:02,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:02,260 INFO L225 Difference]: With dead ends: 3324 [2021-11-23 17:06:02,261 INFO L226 Difference]: Without dead ends: 2913 [2021-11-23 17:06:02,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 454 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1516 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=412, Invalid=3128, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 17:06:02,263 INFO L933 BasicCegarLoop]: 1552 mSDtfsCounter, 7396 mSDsluCounter, 32763 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7396 SdHoareTripleChecker+Valid, 34315 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 234 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:02,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7396 Valid, 34315 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 208 Invalid, 0 Unknown, 234 Unchecked, 0.3s Time] [2021-11-23 17:06:02,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2913 states. [2021-11-23 17:06:02,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2913 to 2603. [2021-11-23 17:06:02,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2603 states, 2601 states have (on average 1.4490580545943867) internal successors, (3769), 2602 states have internal predecessors, (3769), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:02,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2603 states to 2603 states and 3769 transitions. [2021-11-23 17:06:02,377 INFO L78 Accepts]: Start accepts. Automaton has 2603 states and 3769 transitions. Word has length 86 [2021-11-23 17:06:02,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:02,377 INFO L470 AbstractCegarLoop]: Abstraction has 2603 states and 3769 transitions. [2021-11-23 17:06:02,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 6.298245614035087) internal successors, (359), 57 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:02,377 INFO L276 IsEmpty]: Start isEmpty. Operand 2603 states and 3769 transitions. [2021-11-23 17:06:02,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:06:02,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:02,379 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, 1, 1] [2021-11-23 17:06:02,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:02,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2021-11-23 17:06:02,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:02,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:02,980 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:02,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:02,981 INFO L85 PathProgramCache]: Analyzing trace with hash -224911121, now seen corresponding path program 1 times [2021-11-23 17:06:02,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:02,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1379175703] [2021-11-23 17:06:02,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:02,981 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:02,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:02,983 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:02,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:06:03,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:03,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:06:03,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:05,044 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 17:06:05,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:05,614 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 17:06:05,614 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:05,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1379175703] [2021-11-23 17:06:05,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1379175703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:05,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2099736751] [2021-11-23 17:06:05,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:05,615 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:05,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:05,616 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:05,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:06:05,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:05,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:06:05,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:08,309 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 17:06:08,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:09,064 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 17:06:09,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2099736751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:09,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329814644] [2021-11-23 17:06:09,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:09,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:09,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:06:09,084 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:06:09,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:06:09,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:09,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:06:09,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:11,351 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 17:06:11,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:11,680 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 17:06:11,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329814644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:11,681 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:06:11,681 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 11, 9] total 33 [2021-11-23 17:06:11,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038993035] [2021-11-23 17:06:11,681 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:06:11,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:06:11,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:11,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:06:11,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:06:11,683 INFO L87 Difference]: Start difference. First operand 2603 states and 3769 transitions. Second operand has 33 states, 33 states have (on average 8.787878787878787) internal successors, (290), 33 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:13,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:13,116 INFO L93 Difference]: Finished difference Result 3196 states and 4522 transitions. [2021-11-23 17:06:13,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:06:13,116 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 8.787878787878787) internal successors, (290), 33 states have internal predecessors, (290), 0 states have call successors, (0), 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 86 [2021-11-23 17:06:13,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:13,119 INFO L225 Difference]: With dead ends: 3196 [2021-11-23 17:06:13,119 INFO L226 Difference]: Without dead ends: 2785 [2021-11-23 17:06:13,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=214, Invalid=1856, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:06:13,121 INFO L933 BasicCegarLoop]: 1548 mSDtfsCounter, 7297 mSDsluCounter, 26406 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7297 SdHoareTripleChecker+Valid, 27954 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:13,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7297 Valid, 27954 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 157 Invalid, 0 Unknown, 145 Unchecked, 0.2s Time] [2021-11-23 17:06:13,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2785 states. [2021-11-23 17:06:13,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2785 to 2475. [2021-11-23 17:06:13,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2475 states, 2473 states have (on average 1.4577436312171452) internal successors, (3605), 2474 states have internal predecessors, (3605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:13,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2475 states to 2475 states and 3605 transitions. [2021-11-23 17:06:13,236 INFO L78 Accepts]: Start accepts. Automaton has 2475 states and 3605 transitions. Word has length 86 [2021-11-23 17:06:13,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:13,236 INFO L470 AbstractCegarLoop]: Abstraction has 2475 states and 3605 transitions. [2021-11-23 17:06:13,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 8.787878787878787) internal successors, (290), 33 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:13,236 INFO L276 IsEmpty]: Start isEmpty. Operand 2475 states and 3605 transitions. [2021-11-23 17:06:13,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:06:13,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:13,237 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, 1, 1, 1] [2021-11-23 17:06:13,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:13,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:13,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:13,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:13,838 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:13,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:13,839 INFO L85 PathProgramCache]: Analyzing trace with hash 906695599, now seen corresponding path program 1 times [2021-11-23 17:06:13,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:13,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [494004271] [2021-11-23 17:06:13,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:13,839 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:13,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:13,840 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:13,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:06:13,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:13,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:06:13,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:14,318 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 17:06:14,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:14,628 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 17:06:14,628 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:14,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [494004271] [2021-11-23 17:06:14,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [494004271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:14,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1983167789] [2021-11-23 17:06:14,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:14,629 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:14,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:14,630 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:14,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:06:14,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:14,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:14,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:14,858 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 17:06:14,858 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:14,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1983167789] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:14,858 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:06:14,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:06:14,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448250106] [2021-11-23 17:06:14,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:14,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:14,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:14,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:14,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:06:14,859 INFO L87 Difference]: Start difference. First operand 2475 states and 3605 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:14,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:14,970 INFO L93 Difference]: Finished difference Result 3332 states and 4735 transitions. [2021-11-23 17:06:14,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:14,971 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 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 87 [2021-11-23 17:06:14,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:14,975 INFO L225 Difference]: With dead ends: 3332 [2021-11-23 17:06:14,975 INFO L226 Difference]: Without dead ends: 2514 [2021-11-23 17:06:14,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 253 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 17:06:14,978 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 1498 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1498 SdHoareTripleChecker+Valid, 1600 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:14,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1498 Valid, 1600 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:06:14,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2514 states. [2021-11-23 17:06:15,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2514 to 2505. [2021-11-23 17:06:15,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2505 states, 2503 states have (on average 1.448262085497403) internal successors, (3625), 2504 states have internal predecessors, (3625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:15,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2505 states to 2505 states and 3625 transitions. [2021-11-23 17:06:15,140 INFO L78 Accepts]: Start accepts. Automaton has 2505 states and 3625 transitions. Word has length 87 [2021-11-23 17:06:15,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:15,140 INFO L470 AbstractCegarLoop]: Abstraction has 2505 states and 3625 transitions. [2021-11-23 17:06:15,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:15,141 INFO L276 IsEmpty]: Start isEmpty. Operand 2505 states and 3625 transitions. [2021-11-23 17:06:15,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:06:15,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:15,142 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, 1, 1] [2021-11-23 17:06:15,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:15,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-23 17:06:15,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:15,545 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:15,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:15,545 INFO L85 PathProgramCache]: Analyzing trace with hash 422814931, now seen corresponding path program 1 times [2021-11-23 17:06:15,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:15,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [209595095] [2021-11-23 17:06:15,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:15,546 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:15,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:15,546 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:15,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 17:06:15,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:15,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:06:15,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:17,685 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 17:06:17,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:18,222 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 17:06:18,222 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:18,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [209595095] [2021-11-23 17:06:18,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [209595095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:18,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [868676394] [2021-11-23 17:06:18,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:18,223 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:18,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:18,224 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:18,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 17:06:18,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:18,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:06:18,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:20,361 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 17:06:20,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:20,701 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 17:06:20,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [868676394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:20,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419397195] [2021-11-23 17:06:20,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:20,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:20,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:06:20,703 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:06:20,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 17:06:20,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:20,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:06:20,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:22,717 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 17:06:22,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:23,053 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 17:06:23,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419397195] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:23,053 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:06:23,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:06:23,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117281925] [2021-11-23 17:06:23,054 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:06:23,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:06:23,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:23,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:06:23,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:06:23,056 INFO L87 Difference]: Start difference. First operand 2505 states and 3625 transitions. Second operand has 18 states, 18 states have (on average 8.61111111111111) internal successors, (155), 18 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 17:06:23,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:23,304 INFO L93 Difference]: Finished difference Result 2828 states and 4051 transitions. [2021-11-23 17:06:23,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:06:23,305 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.61111111111111) internal successors, (155), 18 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) Word has length 87 [2021-11-23 17:06:23,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:23,308 INFO L225 Difference]: With dead ends: 2828 [2021-11-23 17:06:23,308 INFO L226 Difference]: Without dead ends: 2477 [2021-11-23 17:06:23,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:06:23,310 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 7305 mSDsluCounter, 12297 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7305 SdHoareTripleChecker+Valid, 13826 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:23,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7305 Valid, 13826 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 62 Unchecked, 0.1s Time] [2021-11-23 17:06:23,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2477 states. [2021-11-23 17:06:23,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2477 to 2461. [2021-11-23 17:06:23,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2461 states, 2459 states have (on average 1.4526230174867834) internal successors, (3572), 2460 states have internal predecessors, (3572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:06:23,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2461 states to 2461 states and 3572 transitions. [2021-11-23 17:06:23,425 INFO L78 Accepts]: Start accepts. Automaton has 2461 states and 3572 transitions. Word has length 87 [2021-11-23 17:06:23,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:23,425 INFO L470 AbstractCegarLoop]: Abstraction has 2461 states and 3572 transitions. [2021-11-23 17:06:23,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.61111111111111) internal successors, (155), 18 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 17:06:23,426 INFO L276 IsEmpty]: Start isEmpty. Operand 2461 states and 3572 transitions. [2021-11-23 17:06:23,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 17:06:23,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:23,427 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:06:23,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:23,654 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-23 17:06:23,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:24,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:24,028 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:24,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:24,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1316990164, now seen corresponding path program 1 times [2021-11-23 17:06:24,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:24,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1949954028] [2021-11-23 17:06:24,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:24,029 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:24,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:24,031 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:24,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:06:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:24,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:06:24,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:25,276 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:06:25,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:26,423 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:06:26,423 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:26,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1949954028] [2021-11-23 17:06:26,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1949954028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:26,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [547214803] [2021-11-23 17:06:26,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:26,424 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:26,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:26,427 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:26,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 17:06:26,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:26,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:06:26,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:27,245 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:27,245 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:27,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [547214803] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:27,245 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:06:27,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3] total 7 [2021-11-23 17:06:27,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411209612] [2021-11-23 17:06:27,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:27,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:06:27,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:27,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:06:27,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:06:27,247 INFO L87 Difference]: Start difference. First operand 2461 states and 3572 transitions. Second operand has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:05,068 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:18,642 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:58,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:58,446 INFO L93 Difference]: Finished difference Result 6255 states and 9732 transitions. [2021-11-23 17:07:58,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:07:58,447 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 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 131 [2021-11-23 17:07:58,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:58,452 INFO L225 Difference]: With dead ends: 6255 [2021-11-23 17:07:58,452 INFO L226 Difference]: Without dead ends: 4751 [2021-11-23 17:07:58,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 386 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:07:58,454 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 2394 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 3577 mSolverCounterSat, 2129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 78.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2394 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 5706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2129 IncrementalHoareTripleChecker+Valid, 3577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 90.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:58,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2394 Valid, 131 Invalid, 5706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2129 Valid, 3577 Invalid, 0 Unknown, 0 Unchecked, 90.9s Time] [2021-11-23 17:07:58,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4751 states. [2021-11-23 17:07:58,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4751 to 4714. [2021-11-23 17:07:58,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4714 states, 4712 states have (on average 1.4399405772495755) internal successors, (6785), 4713 states have internal predecessors, (6785), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:58,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4714 states to 4714 states and 6785 transitions. [2021-11-23 17:07:58,594 INFO L78 Accepts]: Start accepts. Automaton has 4714 states and 6785 transitions. Word has length 131 [2021-11-23 17:07:58,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:58,595 INFO L470 AbstractCegarLoop]: Abstraction has 4714 states and 6785 transitions. [2021-11-23 17:07:58,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:58,595 INFO L276 IsEmpty]: Start isEmpty. Operand 4714 states and 6785 transitions. [2021-11-23 17:07:58,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:07:58,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:58,597 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, 1, 1, 1, 1] [2021-11-23 17:07:58,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:58,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Ended with exit code 0 [2021-11-23 17:07:58,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:58,998 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:58,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:58,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1349093591, now seen corresponding path program 1 times [2021-11-23 17:07:58,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:58,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [560551552] [2021-11-23 17:07:58,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:59,000 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:59,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:59,000 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:59,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 17:07:59,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:59,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:07:59,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:02,569 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:02,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:03,768 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:03,768 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:03,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [560551552] [2021-11-23 17:08:03,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [560551552] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:03,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1664205139] [2021-11-23 17:08:03,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:03,769 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:03,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:03,770 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:03,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-23 17:08:03,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:03,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:08:03,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:06,838 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:06,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:07,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1664205139] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:07,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234060266] [2021-11-23 17:08:07,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:07,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:07,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:07,606 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:07,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-23 17:08:07,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:07,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:08:07,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:09,870 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:08:09,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:11,236 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:08:11,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234060266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:11,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:11,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:08:11,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366590143] [2021-11-23 17:08:11,237 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:11,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:08:11,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:11,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:08:11,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:08:11,240 INFO L87 Difference]: Start difference. First operand 4714 states and 6785 transitions. Second operand has 34 states, 34 states have (on average 12.558823529411764) internal successors, (427), 33 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:12,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:12,188 INFO L93 Difference]: Finished difference Result 5602 states and 7940 transitions. [2021-11-23 17:08:12,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:08:12,188 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.558823529411764) internal successors, (427), 33 states have internal predecessors, (427), 0 states have call successors, (0), 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 139 [2021-11-23 17:08:12,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:12,194 INFO L225 Difference]: With dead ends: 5602 [2021-11-23 17:08:12,194 INFO L226 Difference]: Without dead ends: 4754 [2021-11-23 17:08:12,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:08:12,196 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 7330 mSDsluCounter, 27551 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7330 SdHoareTripleChecker+Valid, 29086 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:12,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7330 Valid, 29086 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 53 Invalid, 0 Unknown, 105 Unchecked, 0.1s Time] [2021-11-23 17:08:12,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4754 states. [2021-11-23 17:08:12,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4754 to 4754. [2021-11-23 17:08:12,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4754 states, 4752 states have (on average 1.4370791245791246) internal successors, (6829), 4753 states have internal predecessors, (6829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:12,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4754 states to 4754 states and 6829 transitions. [2021-11-23 17:08:12,356 INFO L78 Accepts]: Start accepts. Automaton has 4754 states and 6829 transitions. Word has length 139 [2021-11-23 17:08:12,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:12,356 INFO L470 AbstractCegarLoop]: Abstraction has 4754 states and 6829 transitions. [2021-11-23 17:08:12,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.558823529411764) internal successors, (427), 33 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:12,356 INFO L276 IsEmpty]: Start isEmpty. Operand 4754 states and 6829 transitions. [2021-11-23 17:08:12,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:08:12,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:12,358 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, 1, 1, 1, 1] [2021-11-23 17:08:12,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:12,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:12,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:12,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:12,959 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:12,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:12,960 INFO L85 PathProgramCache]: Analyzing trace with hash 615569687, now seen corresponding path program 1 times [2021-11-23 17:08:12,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:12,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2138559819] [2021-11-23 17:08:12,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:12,961 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:12,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:12,961 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:12,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-23 17:08:13,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:13,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:08:13,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:16,948 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:16,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:17,957 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:17,957 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:17,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2138559819] [2021-11-23 17:08:17,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2138559819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:17,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [139580429] [2021-11-23 17:08:17,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:17,957 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:17,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:17,958 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:17,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-23 17:08:18,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:18,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:08:18,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:21,541 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:21,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:22,133 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:22,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [139580429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:22,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408342410] [2021-11-23 17:08:22,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:22,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:22,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:22,139 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:22,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-23 17:08:22,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:22,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:08:22,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:25,166 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:08:25,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:26,358 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:08:26,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408342410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:26,358 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:26,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:08:26,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954226706] [2021-11-23 17:08:26,359 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:26,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:08:26,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:26,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:08:26,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:08:26,361 INFO L87 Difference]: Start difference. First operand 4754 states and 6829 transitions. Second operand has 34 states, 34 states have (on average 13.323529411764707) internal successors, (453), 33 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:27,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:27,530 INFO L93 Difference]: Finished difference Result 5729 states and 8090 transitions. [2021-11-23 17:08:27,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:08:27,531 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.323529411764707) internal successors, (453), 33 states have internal predecessors, (453), 0 states have call successors, (0), 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 139 [2021-11-23 17:08:27,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:27,536 INFO L225 Difference]: With dead ends: 5729 [2021-11-23 17:08:27,536 INFO L226 Difference]: Without dead ends: 4881 [2021-11-23 17:08:27,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 803 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=270, Invalid=1800, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:08:27,539 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 10212 mSDsluCounter, 23241 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10212 SdHoareTripleChecker+Valid, 24783 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:27,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10212 Valid, 24783 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 133 Unchecked, 0.1s Time] [2021-11-23 17:08:27,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4881 states. [2021-11-23 17:08:27,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4881 to 4876. [2021-11-23 17:08:27,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4876 states, 4874 states have (on average 1.4300369306524414) internal successors, (6970), 4875 states have internal predecessors, (6970), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:27,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4876 states to 4876 states and 6970 transitions. [2021-11-23 17:08:27,711 INFO L78 Accepts]: Start accepts. Automaton has 4876 states and 6970 transitions. Word has length 139 [2021-11-23 17:08:27,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:27,711 INFO L470 AbstractCegarLoop]: Abstraction has 4876 states and 6970 transitions. [2021-11-23 17:08:27,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.323529411764707) internal successors, (453), 33 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:27,711 INFO L276 IsEmpty]: Start isEmpty. Operand 4876 states and 6970 transitions. [2021-11-23 17:08:27,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:08:27,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:27,713 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, 1, 1, 1, 1] [2021-11-23 17:08:27,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-23 17:08:27,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Ended with exit code 0 [2021-11-23 17:08:28,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:28,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:28,315 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:28,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:28,315 INFO L85 PathProgramCache]: Analyzing trace with hash -516070153, now seen corresponding path program 1 times [2021-11-23 17:08:28,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:28,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1679231919] [2021-11-23 17:08:28,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:28,316 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:28,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:28,317 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:28,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-23 17:08:28,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:28,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:08:28,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:31,833 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:31,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:33,184 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:33,184 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:33,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1679231919] [2021-11-23 17:08:33,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1679231919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:33,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1665683568] [2021-11-23 17:08:33,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:33,185 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:33,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:33,186 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:33,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-23 17:08:33,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:33,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:08:33,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:36,284 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:36,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:37,169 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:37,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1665683568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:37,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649033641] [2021-11-23 17:08:37,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:37,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:37,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:37,170 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:37,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-23 17:08:37,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:37,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:08:37,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:40,130 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:40,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:41,129 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:41,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649033641] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:41,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:41,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:08:41,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404707128] [2021-11-23 17:08:41,130 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:41,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:08:41,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:41,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:08:41,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:08:41,132 INFO L87 Difference]: Start difference. First operand 4876 states and 6970 transitions. Second operand has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:42,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:42,265 INFO L93 Difference]: Finished difference Result 5934 states and 8321 transitions. [2021-11-23 17:08:42,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:08:42,265 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 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 139 [2021-11-23 17:08:42,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:42,272 INFO L225 Difference]: With dead ends: 5934 [2021-11-23 17:08:42,273 INFO L226 Difference]: Without dead ends: 5086 [2021-11-23 17:08:42,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=272, Invalid=1708, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:08:42,276 INFO L933 BasicCegarLoop]: 1539 mSDtfsCounter, 10261 mSDsluCounter, 26042 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10261 SdHoareTripleChecker+Valid, 27581 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:42,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10261 Valid, 27581 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 74 Invalid, 0 Unknown, 174 Unchecked, 0.1s Time] [2021-11-23 17:08:42,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5086 states. [2021-11-23 17:08:42,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5086 to 5086. [2021-11-23 17:08:42,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5086 states, 5084 states have (on average 1.417584579071597) internal successors, (7207), 5085 states have internal predecessors, (7207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:42,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5086 states to 5086 states and 7207 transitions. [2021-11-23 17:08:42,464 INFO L78 Accepts]: Start accepts. Automaton has 5086 states and 7207 transitions. Word has length 139 [2021-11-23 17:08:42,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:42,465 INFO L470 AbstractCegarLoop]: Abstraction has 5086 states and 7207 transitions. [2021-11-23 17:08:42,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:42,465 INFO L276 IsEmpty]: Start isEmpty. Operand 5086 states and 7207 transitions. [2021-11-23 17:08:42,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:08:42,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:42,469 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, 1, 1, 1] [2021-11-23 17:08:42,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:42,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:42,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Ended with exit code 0 [2021-11-23 17:08:43,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:43,086 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:43,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:43,086 INFO L85 PathProgramCache]: Analyzing trace with hash -496273575, now seen corresponding path program 1 times [2021-11-23 17:08:43,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:43,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1798307958] [2021-11-23 17:08:43,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:43,087 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:43,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:43,088 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:43,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:08:43,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:43,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:08:43,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:45,895 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 65 proven. 40 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:08:45,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:46,972 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 65 proven. 40 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:08:46,972 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:46,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1798307958] [2021-11-23 17:08:46,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1798307958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:46,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [437006073] [2021-11-23 17:08:46,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:46,973 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:46,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:46,979 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:46,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:08:47,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:47,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:08:47,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:50,519 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 17:08:50,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:51,544 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 17:08:51,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [437006073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:51,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316939052] [2021-11-23 17:08:51,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:51,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:51,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:51,546 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:51,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:08:51,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:51,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:08:51,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 88 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:08:54,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:55,958 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 88 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:08:55,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316939052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:55,959 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:55,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:08:55,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505809842] [2021-11-23 17:08:55,960 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:55,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:08:55,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:55,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:08:55,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:08:55,962 INFO L87 Difference]: Start difference. First operand 5086 states and 7207 transitions. Second operand has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:58,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:58,020 INFO L93 Difference]: Finished difference Result 6560 states and 9081 transitions. [2021-11-23 17:08:58,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:08:58,020 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 0 states have call successors, (0), 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 139 [2021-11-23 17:08:58,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:58,029 INFO L225 Difference]: With dead ends: 6560 [2021-11-23 17:08:58,029 INFO L226 Difference]: Without dead ends: 5708 [2021-11-23 17:08:58,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 799 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=384, Invalid=2808, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:08:58,034 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 11933 mSDsluCounter, 32237 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11933 SdHoareTripleChecker+Valid, 33766 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:58,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11933 Valid, 33766 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 64 Invalid, 0 Unknown, 174 Unchecked, 0.1s Time] [2021-11-23 17:08:58,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5708 states. [2021-11-23 17:08:58,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5708 to 5523. [2021-11-23 17:08:58,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5523 states, 5521 states have (on average 1.3979351566745155) internal successors, (7718), 5522 states have internal predecessors, (7718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:58,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5523 states to 5523 states and 7718 transitions. [2021-11-23 17:08:58,332 INFO L78 Accepts]: Start accepts. Automaton has 5523 states and 7718 transitions. Word has length 139 [2021-11-23 17:08:58,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:58,333 INFO L470 AbstractCegarLoop]: Abstraction has 5523 states and 7718 transitions. [2021-11-23 17:08:58,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:58,334 INFO L276 IsEmpty]: Start isEmpty. Operand 5523 states and 7718 transitions. [2021-11-23 17:08:58,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:08:58,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:58,338 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, 1, 1, 1] [2021-11-23 17:08:58,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 17:08:58,579 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:08:58,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Ended with exit code 0 [2021-11-23 17:08:58,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:58,955 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:58,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:58,955 INFO L85 PathProgramCache]: Analyzing trace with hash 451700313, now seen corresponding path program 1 times [2021-11-23 17:08:58,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:58,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [340811609] [2021-11-23 17:08:58,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:58,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:58,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:58,957 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:58,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:08:59,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:59,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:08:59,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:01,713 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:09:01,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:02,673 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:09:02,673 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:02,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [340811609] [2021-11-23 17:09:02,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [340811609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:02,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2132759212] [2021-11-23 17:09:02,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:02,674 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:02,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:02,674 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:02,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:09:02,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:02,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:02,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:07,196 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:07,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:08,572 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:08,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2132759212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:08,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968687793] [2021-11-23 17:09:08,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:08,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:08,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:08,573 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:08,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:09:08,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:08,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:08,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:11,321 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:09:11,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:12,714 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:09:12,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968687793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:12,714 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:12,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:09:12,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618463996] [2021-11-23 17:09:12,715 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:12,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:09:12,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:12,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:09:12,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:09:12,717 INFO L87 Difference]: Start difference. First operand 5523 states and 7718 transitions. Second operand has 48 states, 48 states have (on average 12.916666666666666) internal successors, (620), 47 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:15,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:15,264 INFO L93 Difference]: Finished difference Result 6604 states and 9106 transitions. [2021-11-23 17:09:15,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:09:15,265 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.916666666666666) internal successors, (620), 47 states have internal predecessors, (620), 0 states have call successors, (0), 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 139 [2021-11-23 17:09:15,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:15,271 INFO L225 Difference]: With dead ends: 6604 [2021-11-23 17:09:15,272 INFO L226 Difference]: Without dead ends: 5748 [2021-11-23 17:09:15,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 855 GetRequests, 789 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=408, Invalid=3752, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:09:15,275 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 13162 mSDsluCounter, 35926 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13162 SdHoareTripleChecker+Valid, 37468 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:15,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13162 Valid, 37468 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 105 Invalid, 0 Unknown, 177 Unchecked, 0.1s Time] [2021-11-23 17:09:15,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5748 states. [2021-11-23 17:09:15,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5748 to 5744. [2021-11-23 17:09:15,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5744 states, 5742 states have (on average 1.3892371995820272) internal successors, (7977), 5743 states have internal predecessors, (7977), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:15,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5744 states to 5744 states and 7977 transitions. [2021-11-23 17:09:15,540 INFO L78 Accepts]: Start accepts. Automaton has 5744 states and 7977 transitions. Word has length 139 [2021-11-23 17:09:15,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:15,540 INFO L470 AbstractCegarLoop]: Abstraction has 5744 states and 7977 transitions. [2021-11-23 17:09:15,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.916666666666666) internal successors, (620), 47 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:15,541 INFO L276 IsEmpty]: Start isEmpty. Operand 5744 states and 7977 transitions. [2021-11-23 17:09:15,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:09:15,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:15,545 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, 1, 1, 1] [2021-11-23 17:09:15,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:15,772 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-23 17:09:15,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:16,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:16,148 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:16,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:16,148 INFO L85 PathProgramCache]: Analyzing trace with hash 996005209, now seen corresponding path program 1 times [2021-11-23 17:09:16,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:16,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [765454390] [2021-11-23 17:09:16,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:16,149 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:16,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:16,150 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:16,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:09:16,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:16,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:09:16,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:18,837 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:09:18,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:19,735 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:09:19,735 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:19,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [765454390] [2021-11-23 17:09:19,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [765454390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:19,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [920652058] [2021-11-23 17:09:19,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:19,736 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:19,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:19,737 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:19,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:09:19,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:19,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:19,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:23,737 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:23,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:25,157 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:25,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [920652058] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:25,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113655198] [2021-11-23 17:09:25,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:25,158 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:25,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:25,159 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:25,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:09:25,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:25,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:25,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:27,919 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:09:27,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:29,259 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:09:29,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113655198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:29,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:29,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:09:29,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403724765] [2021-11-23 17:09:29,260 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:29,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:09:29,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:29,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:09:29,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:09:29,262 INFO L87 Difference]: Start difference. First operand 5744 states and 7977 transitions. Second operand has 50 states, 50 states have (on average 12.46) internal successors, (623), 49 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:31,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:31,723 INFO L93 Difference]: Finished difference Result 6604 states and 9101 transitions. [2021-11-23 17:09:31,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:09:31,724 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 12.46) internal successors, (623), 49 states have internal predecessors, (623), 0 states have call successors, (0), 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 139 [2021-11-23 17:09:31,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:31,729 INFO L225 Difference]: With dead ends: 6604 [2021-11-23 17:09:31,729 INFO L226 Difference]: Without dead ends: 5744 [2021-11-23 17:09:31,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 787 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=412, Invalid=4010, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:09:31,732 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 14510 mSDsluCounter, 36505 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14510 SdHoareTripleChecker+Valid, 38025 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:31,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14510 Valid, 38025 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 157 Invalid, 0 Unknown, 164 Unchecked, 0.2s Time] [2021-11-23 17:09:31,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5744 states. [2021-11-23 17:09:31,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5744 to 5744. [2021-11-23 17:09:31,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5744 states, 5742 states have (on average 1.3885405781957507) internal successors, (7973), 5743 states have internal predecessors, (7973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:31,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5744 states to 5744 states and 7973 transitions. [2021-11-23 17:09:31,983 INFO L78 Accepts]: Start accepts. Automaton has 5744 states and 7973 transitions. Word has length 139 [2021-11-23 17:09:31,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:31,983 INFO L470 AbstractCegarLoop]: Abstraction has 5744 states and 7973 transitions. [2021-11-23 17:09:31,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 12.46) internal successors, (623), 49 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:31,984 INFO L276 IsEmpty]: Start isEmpty. Operand 5744 states and 7973 transitions. [2021-11-23 17:09:31,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:09:31,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:31,987 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, 1, 1, 1] [2021-11-23 17:09:32,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:32,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-23 17:09:32,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:32,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:32,602 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:32,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:32,602 INFO L85 PathProgramCache]: Analyzing trace with hash -679492519, now seen corresponding path program 1 times [2021-11-23 17:09:32,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:32,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [629202097] [2021-11-23 17:09:32,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:32,603 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:32,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:32,604 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:32,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:09:32,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:32,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:09:32,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:34,889 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 17:09:34,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:36,040 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 17:09:36,041 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:36,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [629202097] [2021-11-23 17:09:36,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [629202097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:36,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1128134201] [2021-11-23 17:09:36,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:36,042 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:36,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:36,043 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:36,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2021-11-23 17:09:36,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:36,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:36,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:39,042 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:39,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:40,198 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:40,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1128134201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:40,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109371114] [2021-11-23 17:09:40,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:40,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:40,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:40,201 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:40,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-23 17:09:40,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:40,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:40,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:42,541 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:09:42,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:43,909 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:09:43,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109371114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:43,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:43,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:09:43,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702359858] [2021-11-23 17:09:43,910 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:43,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:09:43,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:43,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:09:43,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:09:43,912 INFO L87 Difference]: Start difference. First operand 5744 states and 7973 transitions. Second operand has 39 states, 39 states have (on average 13.846153846153847) internal successors, (540), 38 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:45,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:45,757 INFO L93 Difference]: Finished difference Result 6900 states and 9459 transitions. [2021-11-23 17:09:45,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:09:45,757 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 13.846153846153847) internal successors, (540), 38 states have internal predecessors, (540), 0 states have call successors, (0), 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 139 [2021-11-23 17:09:45,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:45,763 INFO L225 Difference]: With dead ends: 6900 [2021-11-23 17:09:45,763 INFO L226 Difference]: Without dead ends: 6036 [2021-11-23 17:09:45,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 850 GetRequests, 795 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=365, Invalid=2605, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:09:45,766 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 11866 mSDsluCounter, 30380 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11866 SdHoareTripleChecker+Valid, 31905 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 332 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:45,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11866 Valid, 31905 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 123 Invalid, 0 Unknown, 332 Unchecked, 0.1s Time] [2021-11-23 17:09:45,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6036 states. [2021-11-23 17:09:46,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6036 to 6033. [2021-11-23 17:09:46,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6033 states, 6031 states have (on average 1.3780467584148566) internal successors, (8311), 6032 states have internal predecessors, (8311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:46,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6033 states to 6033 states and 8311 transitions. [2021-11-23 17:09:46,079 INFO L78 Accepts]: Start accepts. Automaton has 6033 states and 8311 transitions. Word has length 139 [2021-11-23 17:09:46,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:46,079 INFO L470 AbstractCegarLoop]: Abstraction has 6033 states and 8311 transitions. [2021-11-23 17:09:46,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 13.846153846153847) internal successors, (540), 38 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:46,080 INFO L276 IsEmpty]: Start isEmpty. Operand 6033 states and 8311 transitions. [2021-11-23 17:09:46,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:09:46,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:46,084 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, 1, 1, 1, 1] [2021-11-23 17:09:46,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:46,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Ended with exit code 0 [2021-11-23 17:09:46,508 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Ended with exit code 0 [2021-11-23 17:09:46,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:46,699 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:46,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:46,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1944468657, now seen corresponding path program 1 times [2021-11-23 17:09:46,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:46,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [424896369] [2021-11-23 17:09:46,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:46,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:46,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:46,701 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:46,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2021-11-23 17:09:46,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:46,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:46,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:50,682 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:50,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:51,655 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:51,655 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:51,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [424896369] [2021-11-23 17:09:51,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [424896369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:51,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2037795722] [2021-11-23 17:09:51,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:51,656 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:51,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:51,657 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:51,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2021-11-23 17:09:51,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:51,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:51,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:55,181 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:55,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:55,748 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:55,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2037795722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:55,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767449847] [2021-11-23 17:09:55,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:55,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:55,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:55,750 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:55,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 17:09:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:55,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:55,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:58,614 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:09:58,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:59,820 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:09:59,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767449847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:59,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:59,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:09:59,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228595676] [2021-11-23 17:09:59,821 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:59,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:09:59,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:59,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:09:59,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:09:59,822 INFO L87 Difference]: Start difference. First operand 6033 states and 8311 transitions. Second operand has 34 states, 34 states have (on average 13.294117647058824) internal successors, (452), 33 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:00,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:00,961 INFO L93 Difference]: Finished difference Result 7000 states and 9558 transitions. [2021-11-23 17:10:00,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:10:00,962 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.294117647058824) internal successors, (452), 33 states have internal predecessors, (452), 0 states have call successors, (0), 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 140 [2021-11-23 17:10:00,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:00,968 INFO L225 Difference]: With dead ends: 7000 [2021-11-23 17:10:00,968 INFO L226 Difference]: Without dead ends: 6057 [2021-11-23 17:10:00,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 807 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=245, Invalid=1647, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:10:00,971 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 7333 mSDsluCounter, 30863 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7333 SdHoareTripleChecker+Valid, 32405 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:00,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7333 Valid, 32405 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 30 Invalid, 0 Unknown, 131 Unchecked, 0.0s Time] [2021-11-23 17:10:00,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6057 states. [2021-11-23 17:10:01,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6057 to 6033. [2021-11-23 17:10:01,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6033 states, 6031 states have (on average 1.3780467584148566) internal successors, (8311), 6032 states have internal predecessors, (8311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:01,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6033 states to 6033 states and 8311 transitions. [2021-11-23 17:10:01,243 INFO L78 Accepts]: Start accepts. Automaton has 6033 states and 8311 transitions. Word has length 140 [2021-11-23 17:10:01,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:01,244 INFO L470 AbstractCegarLoop]: Abstraction has 6033 states and 8311 transitions. [2021-11-23 17:10:01,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.294117647058824) internal successors, (452), 33 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:01,244 INFO L276 IsEmpty]: Start isEmpty. Operand 6033 states and 8311 transitions. [2021-11-23 17:10:01,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:01,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:01,247 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, 1, 1, 1, 1, 1] [2021-11-23 17:10:01,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:01,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:01,669 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2021-11-23 17:10:01,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:01,851 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:01,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:01,851 INFO L85 PathProgramCache]: Analyzing trace with hash 717160927, now seen corresponding path program 1 times [2021-11-23 17:10:01,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:01,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2076733844] [2021-11-23 17:10:01,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:01,852 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:01,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:01,853 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:01,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 17:10:01,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:01,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:01,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:03,727 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:03,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:04,768 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:04,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2076733844] [2021-11-23 17:10:04,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2076733844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:04,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1914690513] [2021-11-23 17:10:04,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:04,768 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:04,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:04,769 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:04,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 17:10:04,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:04,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:04,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:06,549 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:06,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:07,414 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:07,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1914690513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:07,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333292145] [2021-11-23 17:10:07,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:07,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:07,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:07,425 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:07,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 17:10:07,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:07,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:07,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:09,219 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:09,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:10,074 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:10,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333292145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:10,074 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:10,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:10:10,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72073898] [2021-11-23 17:10:10,075 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:10,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:10:10,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:10,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:10:10,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:10:10,076 INFO L87 Difference]: Start difference. First operand 6033 states and 8311 transitions. Second operand has 16 states, 16 states have (on average 12.6875) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:10,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:10,773 INFO L93 Difference]: Finished difference Result 7799 states and 10613 transitions. [2021-11-23 17:10:10,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:10:10,774 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.6875) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 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 140 [2021-11-23 17:10:10,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:10,781 INFO L225 Difference]: With dead ends: 7799 [2021-11-23 17:10:10,782 INFO L226 Difference]: Without dead ends: 6947 [2021-11-23 17:10:10,784 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 821 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:10:10,785 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 4470 mSDsluCounter, 12386 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4470 SdHoareTripleChecker+Valid, 13923 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:10,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4470 Valid, 13923 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 98 Unchecked, 0.1s Time] [2021-11-23 17:10:10,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6947 states. [2021-11-23 17:10:11,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6947 to 6943. [2021-11-23 17:10:11,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6943 states, 6941 states have (on average 1.3660855784469097) internal successors, (9482), 6942 states have internal predecessors, (9482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:11,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6943 states to 6943 states and 9482 transitions. [2021-11-23 17:10:11,089 INFO L78 Accepts]: Start accepts. Automaton has 6943 states and 9482 transitions. Word has length 140 [2021-11-23 17:10:11,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:11,090 INFO L470 AbstractCegarLoop]: Abstraction has 6943 states and 9482 transitions. [2021-11-23 17:10:11,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.6875) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:11,090 INFO L276 IsEmpty]: Start isEmpty. Operand 6943 states and 9482 transitions. [2021-11-23 17:10:11,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:11,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:11,093 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, 1, 1, 1, 1] [2021-11-23 17:10:11,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Ended with exit code 0 [2021-11-23 17:10:11,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:11,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:11,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:11,694 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:11,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:11,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1128206239, now seen corresponding path program 1 times [2021-11-23 17:10:11,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:11,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [698072656] [2021-11-23 17:10:11,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:11,695 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:11,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:11,696 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:11,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 17:10:11,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:11,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:11,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:13,122 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:10:13,122 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:13,122 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:13,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [698072656] [2021-11-23 17:10:13,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [698072656] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:13,123 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:13,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:10:13,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179445000] [2021-11-23 17:10:13,123 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:13,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:13,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:13,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:13,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:13,124 INFO L87 Difference]: Start difference. First operand 6943 states and 9482 transitions. Second operand has 6 states, 6 states have (on average 22.166666666666668) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:13,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:13,445 INFO L93 Difference]: Finished difference Result 7821 states and 10621 transitions. [2021-11-23 17:10:13,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:10:13,446 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.166666666666668) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:10:13,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:13,457 INFO L225 Difference]: With dead ends: 7821 [2021-11-23 17:10:13,458 INFO L226 Difference]: Without dead ends: 6969 [2021-11-23 17:10:13,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 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 17:10:13,462 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 2954 mSDsluCounter, 1650 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2954 SdHoareTripleChecker+Valid, 3188 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:13,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2954 Valid, 3188 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 49 Unchecked, 0.0s Time] [2021-11-23 17:10:13,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6969 states. [2021-11-23 17:10:13,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6969 to 6943. [2021-11-23 17:10:13,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6943 states, 6941 states have (on average 1.3634922921769197) internal successors, (9464), 6942 states have internal predecessors, (9464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:13,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6943 states to 6943 states and 9464 transitions. [2021-11-23 17:10:13,860 INFO L78 Accepts]: Start accepts. Automaton has 6943 states and 9464 transitions. Word has length 140 [2021-11-23 17:10:13,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:13,860 INFO L470 AbstractCegarLoop]: Abstraction has 6943 states and 9464 transitions. [2021-11-23 17:10:13,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.166666666666668) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:13,860 INFO L276 IsEmpty]: Start isEmpty. Operand 6943 states and 9464 transitions. [2021-11-23 17:10:13,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:13,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:13,863 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, 1, 1, 1, 1] [2021-11-23 17:10:13,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:14,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:14,064 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:14,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:14,064 INFO L85 PathProgramCache]: Analyzing trace with hash -180232351, now seen corresponding path program 1 times [2021-11-23 17:10:14,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:14,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [553493616] [2021-11-23 17:10:14,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:14,065 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:14,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:14,066 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:14,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:10:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:14,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:10:14,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:10:16,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:17,861 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:10:17,861 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:17,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [553493616] [2021-11-23 17:10:17,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [553493616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:17,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2142009845] [2021-11-23 17:10:17,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:17,862 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:17,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:17,863 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:17,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:10:18,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:18,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:18,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:20,188 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:20,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:21,351 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:21,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2142009845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:21,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970079015] [2021-11-23 17:10:21,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:21,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:21,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:21,363 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:21,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:10:21,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:21,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:21,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:23,110 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:23,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:24,075 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:24,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970079015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:24,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:24,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:10:24,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152435085] [2021-11-23 17:10:24,076 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:24,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:10:24,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:24,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:10:24,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:10:24,078 INFO L87 Difference]: Start difference. First operand 6943 states and 9464 transitions. Second operand has 32 states, 32 states have (on average 12.5) internal successors, (400), 31 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:26,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:26,302 INFO L93 Difference]: Finished difference Result 9434 states and 12644 transitions. [2021-11-23 17:10:26,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:10:26,303 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.5) internal successors, (400), 31 states have internal predecessors, (400), 0 states have call successors, (0), 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 140 [2021-11-23 17:10:26,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:26,311 INFO L225 Difference]: With dead ends: 9434 [2021-11-23 17:10:26,311 INFO L226 Difference]: Without dead ends: 8578 [2021-11-23 17:10:26,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 811 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=310, Invalid=2342, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:10:26,315 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 13291 mSDsluCounter, 23422 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13291 SdHoareTripleChecker+Valid, 24983 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:26,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13291 Valid, 24983 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 124 Unchecked, 0.1s Time] [2021-11-23 17:10:26,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8578 states. [2021-11-23 17:10:26,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8578 to 8554. [2021-11-23 17:10:26,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8554 states, 8552 states have (on average 1.3434284377923293) internal successors, (11489), 8553 states have internal predecessors, (11489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:26,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8554 states to 8554 states and 11489 transitions. [2021-11-23 17:10:26,833 INFO L78 Accepts]: Start accepts. Automaton has 8554 states and 11489 transitions. Word has length 140 [2021-11-23 17:10:26,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:26,833 INFO L470 AbstractCegarLoop]: Abstraction has 8554 states and 11489 transitions. [2021-11-23 17:10:26,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.5) internal successors, (400), 31 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:26,833 INFO L276 IsEmpty]: Start isEmpty. Operand 8554 states and 11489 transitions. [2021-11-23 17:10:26,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:26,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:26,837 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, 1, 1, 1, 1] [2021-11-23 17:10:26,863 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-23 17:10:27,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-23 17:10:27,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:27,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:27,438 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:27,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:27,438 INFO L85 PathProgramCache]: Analyzing trace with hash 364072545, now seen corresponding path program 1 times [2021-11-23 17:10:27,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:27,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1704226202] [2021-11-23 17:10:27,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:27,439 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:27,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:27,440 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:27,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:10:27,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:27,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:10:27,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:30,192 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:10:30,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:31,034 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:10:31,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:31,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1704226202] [2021-11-23 17:10:31,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1704226202] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:31,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1189140142] [2021-11-23 17:10:31,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:31,035 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:31,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:31,035 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:31,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 17:10:31,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:31,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:31,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:33,200 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:33,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:34,361 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:34,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1189140142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:34,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348389554] [2021-11-23 17:10:34,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:34,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:34,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:34,363 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:34,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:10:34,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:34,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:34,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:35,984 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:35,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:36,875 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:36,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348389554] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:36,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:36,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:10:36,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918638558] [2021-11-23 17:10:36,876 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:36,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:10:36,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:36,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:10:36,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:10:36,877 INFO L87 Difference]: Start difference. First operand 8554 states and 11489 transitions. Second operand has 32 states, 32 states have (on average 12.59375) internal successors, (403), 31 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:39,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:39,465 INFO L93 Difference]: Finished difference Result 12220 states and 16173 transitions. [2021-11-23 17:10:39,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:10:39,466 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.59375) internal successors, (403), 31 states have internal predecessors, (403), 0 states have call successors, (0), 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 140 [2021-11-23 17:10:39,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:39,479 INFO L225 Difference]: With dead ends: 12220 [2021-11-23 17:10:39,479 INFO L226 Difference]: Without dead ends: 11360 [2021-11-23 17:10:39,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 861 GetRequests, 809 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=310, Invalid=2342, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:10:39,483 INFO L933 BasicCegarLoop]: 1558 mSDtfsCounter, 10309 mSDsluCounter, 25006 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10309 SdHoareTripleChecker+Valid, 26564 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 240 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:39,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10309 Valid, 26564 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 94 Invalid, 0 Unknown, 240 Unchecked, 0.1s Time] [2021-11-23 17:10:39,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11360 states. [2021-11-23 17:10:40,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11360 to 11336. [2021-11-23 17:10:40,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11336 states, 11334 states have (on average 1.3245985530262925) internal successors, (15013), 11335 states have internal predecessors, (15013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:40,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11336 states to 11336 states and 15013 transitions. [2021-11-23 17:10:40,199 INFO L78 Accepts]: Start accepts. Automaton has 11336 states and 15013 transitions. Word has length 140 [2021-11-23 17:10:40,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:40,200 INFO L470 AbstractCegarLoop]: Abstraction has 11336 states and 15013 transitions. [2021-11-23 17:10:40,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.59375) internal successors, (403), 31 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:40,200 INFO L276 IsEmpty]: Start isEmpty. Operand 11336 states and 15013 transitions. [2021-11-23 17:10:40,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:40,204 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:40,204 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, 1, 1, 1, 1] [2021-11-23 17:10:40,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:40,430 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2021-11-23 17:10:40,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:40,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:40,805 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:40,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:40,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1311425183, now seen corresponding path program 1 times [2021-11-23 17:10:40,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:40,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1287661715] [2021-11-23 17:10:40,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:40,811 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:40,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:40,812 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:40,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:10:40,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:40,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:10:40,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:43,210 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 17:10:43,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:44,291 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 17:10:44,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:44,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1287661715] [2021-11-23 17:10:44,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1287661715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:44,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [15494144] [2021-11-23 17:10:44,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:44,292 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:44,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:44,293 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:44,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:10:44,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:44,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:44,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:45,970 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:45,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:46,841 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:46,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [15494144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:46,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889487361] [2021-11-23 17:10:46,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:46,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:46,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:46,843 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:46,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:10:46,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:46,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:10:46,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:48,307 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:48,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:49,082 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:10:49,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889487361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:49,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:49,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:10:49,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178505722] [2021-11-23 17:10:49,082 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:49,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:10:49,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:49,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:10:49,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:10:49,084 INFO L87 Difference]: Start difference. First operand 11336 states and 15013 transitions. Second operand has 20 states, 20 states have (on average 14.4) internal successors, (288), 19 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:50,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:50,331 INFO L93 Difference]: Finished difference Result 14491 states and 19016 transitions. [2021-11-23 17:10:50,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:10:50,332 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 14.4) internal successors, (288), 19 states have internal predecessors, (288), 0 states have call successors, (0), 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 140 [2021-11-23 17:10:50,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:50,345 INFO L225 Difference]: With dead ends: 14491 [2021-11-23 17:10:50,345 INFO L226 Difference]: Without dead ends: 13627 [2021-11-23 17:10:50,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 819 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=150, Invalid=720, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:10:50,350 INFO L933 BasicCegarLoop]: 1560 mSDtfsCounter, 7477 mSDsluCounter, 15316 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7477 SdHoareTripleChecker+Valid, 16876 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:50,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7477 Valid, 16876 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 71 Unchecked, 0.1s Time] [2021-11-23 17:10:50,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13627 states. [2021-11-23 17:10:51,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13627 to 13561. [2021-11-23 17:10:51,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13561 states, 13559 states have (on average 1.3102736189984512) internal successors, (17766), 13560 states have internal predecessors, (17766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:51,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13561 states to 13561 states and 17766 transitions. [2021-11-23 17:10:51,254 INFO L78 Accepts]: Start accepts. Automaton has 13561 states and 17766 transitions. Word has length 140 [2021-11-23 17:10:51,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:51,254 INFO L470 AbstractCegarLoop]: Abstraction has 13561 states and 17766 transitions. [2021-11-23 17:10:51,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 14.4) internal successors, (288), 19 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:51,254 INFO L276 IsEmpty]: Start isEmpty. Operand 13561 states and 17766 transitions. [2021-11-23 17:10:51,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:51,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:51,258 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, 1, 1, 1, 1] [2021-11-23 17:10:51,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:51,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-23 17:10:51,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:51,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:51,863 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:51,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:51,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1683148840, now seen corresponding path program 1 times [2021-11-23 17:10:51,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:51,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [399674927] [2021-11-23 17:10:51,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:51,865 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:51,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:51,866 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:51,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:10:51,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:51,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:51,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:53,227 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:10:53,227 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:53,227 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:53,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [399674927] [2021-11-23 17:10:53,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [399674927] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:53,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:53,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:10:53,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872675093] [2021-11-23 17:10:53,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:53,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:53,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:53,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:53,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:53,228 INFO L87 Difference]: Start difference. First operand 13561 states and 17766 transitions. Second operand has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:54,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:54,464 INFO L93 Difference]: Finished difference Result 19311 states and 25096 transitions. [2021-11-23 17:10:54,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:10:54,465 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:10:54,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:54,487 INFO L225 Difference]: With dead ends: 19311 [2021-11-23 17:10:54,487 INFO L226 Difference]: Without dead ends: 17407 [2021-11-23 17:10:54,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:54,493 INFO L933 BasicCegarLoop]: 1546 mSDtfsCounter, 2948 mSDsluCounter, 3080 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2948 SdHoareTripleChecker+Valid, 4626 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:54,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2948 Valid, 4626 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 46 Unchecked, 0.0s Time] [2021-11-23 17:10:54,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17407 states. [2021-11-23 17:10:55,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17407 to 17405. [2021-11-23 17:10:55,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17405 states, 17403 states have (on average 1.297822214560708) internal successors, (22586), 17404 states have internal predecessors, (22586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:55,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17405 states to 17405 states and 22586 transitions. [2021-11-23 17:10:55,644 INFO L78 Accepts]: Start accepts. Automaton has 17405 states and 22586 transitions. Word has length 140 [2021-11-23 17:10:55,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:55,644 INFO L470 AbstractCegarLoop]: Abstraction has 17405 states and 22586 transitions. [2021-11-23 17:10:55,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:55,645 INFO L276 IsEmpty]: Start isEmpty. Operand 17405 states and 22586 transitions. [2021-11-23 17:10:55,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:10:55,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:55,649 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, 1, 1, 1, 1, 1] [2021-11-23 17:10:55,657 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Ended with exit code 0 [2021-11-23 17:10:55,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:10:55,849 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:55,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:55,849 INFO L85 PathProgramCache]: Analyzing trace with hash 761060097, now seen corresponding path program 1 times [2021-11-23 17:10:55,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:55,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [84998092] [2021-11-23 17:10:55,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:55,850 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:55,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:55,851 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:55,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:10:55,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:55,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:10:55,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:57,121 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:10:57,121 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:10:57,121 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:57,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [84998092] [2021-11-23 17:10:57,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [84998092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:10:57,121 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:10:57,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:10:57,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567881536] [2021-11-23 17:10:57,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:10:57,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:10:57,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:57,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:10:57,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:10:57,122 INFO L87 Difference]: Start difference. First operand 17405 states and 22586 transitions. Second operand has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:58,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:58,814 INFO L93 Difference]: Finished difference Result 25349 states and 32595 transitions. [2021-11-23 17:10:58,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:10:58,814 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 0 states have call successors, (0), 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 140 [2021-11-23 17:10:58,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:58,838 INFO L225 Difference]: With dead ends: 25349 [2021-11-23 17:10:58,838 INFO L226 Difference]: Without dead ends: 24367 [2021-11-23 17:10:58,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 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 17:10:58,843 INFO L933 BasicCegarLoop]: 1549 mSDtfsCounter, 2965 mSDsluCounter, 1640 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2965 SdHoareTripleChecker+Valid, 3189 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:58,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2965 Valid, 3189 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 51 Unchecked, 0.0s Time] [2021-11-23 17:10:58,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24367 states. [2021-11-23 17:11:00,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24367 to 24193. [2021-11-23 17:11:00,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24193 states, 24191 states have (on average 1.2826671076020006) internal successors, (31029), 24192 states have internal predecessors, (31029), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:00,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24193 states to 24193 states and 31029 transitions. [2021-11-23 17:11:00,679 INFO L78 Accepts]: Start accepts. Automaton has 24193 states and 31029 transitions. Word has length 140 [2021-11-23 17:11:00,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:00,679 INFO L470 AbstractCegarLoop]: Abstraction has 24193 states and 31029 transitions. [2021-11-23 17:11:00,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:00,679 INFO L276 IsEmpty]: Start isEmpty. Operand 24193 states and 31029 transitions. [2021-11-23 17:11:00,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:11:00,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:00,684 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, 1, 1, 1] [2021-11-23 17:11:00,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:00,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:00,885 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:00,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:00,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1346271750, now seen corresponding path program 1 times [2021-11-23 17:11:00,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:00,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1411877425] [2021-11-23 17:11:00,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:00,885 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:00,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:00,886 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:00,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2021-11-23 17:11:00,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:00,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:11:00,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:04,284 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:04,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:05,635 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:05,635 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:05,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1411877425] [2021-11-23 17:11:05,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1411877425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:05,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2134917996] [2021-11-23 17:11:05,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:05,636 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:05,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:05,637 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:05,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Waiting until timeout for monitored process [2021-11-23 17:11:05,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:05,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:11:05,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:09,361 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:09,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:10,427 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:10,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2134917996] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:10,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740684982] [2021-11-23 17:11:10,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:10,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:10,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:10,428 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:10,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-23 17:11:10,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:10,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:11:10,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:13,508 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:13,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:14,494 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:14,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740684982] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:14,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:14,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:11:14,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685022332] [2021-11-23 17:11:14,495 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:14,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:11:14,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:14,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:11:14,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:11:14,497 INFO L87 Difference]: Start difference. First operand 24193 states and 31029 transitions. Second operand has 26 states, 26 states have (on average 10.115384615384615) internal successors, (263), 25 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:17,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:17,254 INFO L93 Difference]: Finished difference Result 25748 states and 33032 transitions. [2021-11-23 17:11:17,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:11:17,255 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 10.115384615384615) internal successors, (263), 25 states have internal predecessors, (263), 0 states have call successors, (0), 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 140 [2021-11-23 17:11:17,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:17,287 INFO L225 Difference]: With dead ends: 25748 [2021-11-23 17:11:17,287 INFO L226 Difference]: Without dead ends: 24288 [2021-11-23 17:11:17,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 810 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:11:17,296 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 8809 mSDsluCounter, 21731 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8809 SdHoareTripleChecker+Valid, 23292 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 245 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:17,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8809 Valid, 23292 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 117 Invalid, 0 Unknown, 245 Unchecked, 0.2s Time] [2021-11-23 17:11:17,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24288 states. [2021-11-23 17:11:19,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24288 to 24196. [2021-11-23 17:11:19,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24196 states, 24194 states have (on average 1.2825907249731339) internal successors, (31031), 24195 states have internal predecessors, (31031), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:19,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24196 states to 24196 states and 31031 transitions. [2021-11-23 17:11:19,500 INFO L78 Accepts]: Start accepts. Automaton has 24196 states and 31031 transitions. Word has length 140 [2021-11-23 17:11:19,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:19,500 INFO L470 AbstractCegarLoop]: Abstraction has 24196 states and 31031 transitions. [2021-11-23 17:11:19,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 10.115384615384615) internal successors, (263), 25 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:19,500 INFO L276 IsEmpty]: Start isEmpty. Operand 24196 states and 31031 transitions. [2021-11-23 17:11:19,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:11:19,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:19,506 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, 1, 1, 1, 1] [2021-11-23 17:11:19,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:19,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Ended with exit code 0 [2021-11-23 17:11:19,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:20,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:20,107 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:20,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:20,108 INFO L85 PathProgramCache]: Analyzing trace with hash -585933432, now seen corresponding path program 1 times [2021-11-23 17:11:20,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:20,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1725379632] [2021-11-23 17:11:20,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:20,109 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:20,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:20,111 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:20,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Waiting until timeout for monitored process [2021-11-23 17:11:20,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:20,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:20,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:22,571 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 17:11:22,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:23,749 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 17:11:23,749 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:23,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1725379632] [2021-11-23 17:11:23,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1725379632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:23,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [56594888] [2021-11-23 17:11:23,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:23,750 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:23,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:23,752 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:23,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Waiting until timeout for monitored process [2021-11-23 17:11:23,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:23,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:11:23,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:27,129 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:27,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:28,282 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:28,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [56594888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:28,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632471154] [2021-11-23 17:11:28,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:28,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:28,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:28,295 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:28,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-23 17:11:28,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:28,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:28,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:31,313 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:11:31,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:33,020 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:11:33,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632471154] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:33,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:33,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:11:33,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372627849] [2021-11-23 17:11:33,021 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:33,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:11:33,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:33,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:11:33,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:11:33,023 INFO L87 Difference]: Start difference. First operand 24196 states and 31031 transitions. Second operand has 39 states, 39 states have (on average 14.0) internal successors, (546), 38 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:36,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:36,720 INFO L93 Difference]: Finished difference Result 25602 states and 32827 transitions. [2021-11-23 17:11:36,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:11:36,721 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 14.0) internal successors, (546), 38 states have internal predecessors, (546), 0 states have call successors, (0), 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 140 [2021-11-23 17:11:36,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:36,752 INFO L225 Difference]: With dead ends: 25602 [2021-11-23 17:11:36,753 INFO L226 Difference]: Without dead ends: 24738 [2021-11-23 17:11:36,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 801 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=357, Invalid=2613, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:11:36,759 INFO L933 BasicCegarLoop]: 1543 mSDtfsCounter, 11776 mSDsluCounter, 34918 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11776 SdHoareTripleChecker+Valid, 36461 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 200 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:36,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11776 Valid, 36461 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 93 Invalid, 0 Unknown, 200 Unchecked, 0.1s Time] [2021-11-23 17:11:36,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24738 states. [2021-11-23 17:11:38,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24738 to 24306. [2021-11-23 17:11:38,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24306 states, 24304 states have (on average 1.2826283739302173) internal successors, (31173), 24305 states have internal predecessors, (31173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:38,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24306 states to 24306 states and 31173 transitions. [2021-11-23 17:11:38,836 INFO L78 Accepts]: Start accepts. Automaton has 24306 states and 31173 transitions. Word has length 140 [2021-11-23 17:11:38,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:38,837 INFO L470 AbstractCegarLoop]: Abstraction has 24306 states and 31173 transitions. [2021-11-23 17:11:38,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 14.0) internal successors, (546), 38 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:38,837 INFO L276 IsEmpty]: Start isEmpty. Operand 24306 states and 31173 transitions. [2021-11-23 17:11:38,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:11:38,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:38,844 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, 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] [2021-11-23 17:11:38,855 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Ended with exit code 0 [2021-11-23 17:11:39,071 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2021-11-23 17:11:39,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:39,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:39,446 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:39,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:39,446 INFO L85 PathProgramCache]: Analyzing trace with hash 721196654, now seen corresponding path program 1 times [2021-11-23 17:11:39,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:39,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [205858788] [2021-11-23 17:11:39,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:39,447 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:39,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:39,448 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:39,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2021-11-23 17:11:39,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:39,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:11:39,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:45,283 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:45,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:48,983 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:48,983 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:48,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [205858788] [2021-11-23 17:11:48,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [205858788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:48,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1794334638] [2021-11-23 17:11:48,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:48,984 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:48,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:48,985 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:48,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Waiting until timeout for monitored process [2021-11-23 17:11:49,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:49,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:11:49,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:56,672 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:56,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:02,197 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:02,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1794334638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:02,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983010918] [2021-11-23 17:12:02,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:02,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:02,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:02,198 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:02,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 17:12:02,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:02,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:12:02,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:09,557 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:09,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:11,162 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:11,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983010918] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:11,162 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:11,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23, 22, 22, 21] total 103 [2021-11-23 17:12:11,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54509485] [2021-11-23 17:12:11,163 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:11,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-23 17:12:11,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:11,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-23 17:12:11,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=10114, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 17:12:11,165 INFO L87 Difference]: Start difference. First operand 24306 states and 31173 transitions. Second operand has 103 states, 103 states have (on average 6.155339805825243) internal successors, (634), 103 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 17:12:27,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:27,185 INFO L93 Difference]: Finished difference Result 35449 states and 44580 transitions. [2021-11-23 17:12:27,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-23 17:12:27,186 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 6.155339805825243) internal successors, (634), 103 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 141 [2021-11-23 17:12:27,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:27,231 INFO L225 Difference]: With dead ends: 35449 [2021-11-23 17:12:27,231 INFO L226 Difference]: Without dead ends: 35097 [2021-11-23 17:12:27,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 761 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6166 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=1017, Invalid=20445, Unknown=0, NotChecked=0, Total=21462 [2021-11-23 17:12:27,242 INFO L933 BasicCegarLoop]: 1618 mSDtfsCounter, 26345 mSDsluCounter, 69082 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26345 SdHoareTripleChecker+Valid, 70700 SdHoareTripleChecker+Invalid, 1533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 682 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:27,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26345 Valid, 70700 Invalid, 1533 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [28 Valid, 823 Invalid, 0 Unknown, 682 Unchecked, 1.5s Time] [2021-11-23 17:12:27,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35097 states. [2021-11-23 17:12:29,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35097 to 24313. [2021-11-23 17:12:29,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24313 states, 24311 states have (on average 1.2826292624737774) internal successors, (31182), 24312 states have internal predecessors, (31182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:29,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24313 states to 24313 states and 31182 transitions. [2021-11-23 17:12:29,408 INFO L78 Accepts]: Start accepts. Automaton has 24313 states and 31182 transitions. Word has length 141 [2021-11-23 17:12:29,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:29,409 INFO L470 AbstractCegarLoop]: Abstraction has 24313 states and 31182 transitions. [2021-11-23 17:12:29,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 6.155339805825243) internal successors, (634), 103 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 17:12:29,409 INFO L276 IsEmpty]: Start isEmpty. Operand 24313 states and 31182 transitions. [2021-11-23 17:12:29,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:12:29,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:29,415 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, 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] [2021-11-23 17:12:29,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:29,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-23 17:12:29,829 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Ended with exit code 0 [2021-11-23 17:12:30,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:30,016 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:30,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:30,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1651492465, now seen corresponding path program 1 times [2021-11-23 17:12:30,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:30,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1533596065] [2021-11-23 17:12:30,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:30,017 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:30,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:30,019 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:30,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Waiting until timeout for monitored process [2021-11-23 17:12:30,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:30,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:12:30,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:42,694 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:42,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:49,542 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:49,542 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:49,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1533596065] [2021-11-23 17:12:49,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1533596065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:49,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [32446457] [2021-11-23 17:12:49,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:49,543 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:49,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:49,544 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:49,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Waiting until timeout for monitored process [2021-11-23 17:12:49,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:49,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:12:49,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:05,853 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:05,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:13,516 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:13,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [32446457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:13,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448072649] [2021-11-23 17:13:13,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:13,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:13,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:13,518 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:13,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0d0b193-4d69-4972-9524-6e17a0113461/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 17:13:13,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:13,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:13:13,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:23,171 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:23,171 INFO L328 TraceCheckSpWp]: Computing backward predicates...