./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8 --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 23bbff91fb2bcbd238fb97db06c7d4983c05a850 ..................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8 --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 23bbff91fb2bcbd238fb97db06c7d4983c05a850 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 06:57:48,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 06:57:48,950 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 06:57:48,991 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 06:57:48,992 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 06:57:48,994 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 06:57:48,996 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 06:57:48,999 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 06:57:49,002 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 06:57:49,004 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 06:57:49,006 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 06:57:49,008 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 06:57:49,008 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 06:57:49,010 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 06:57:49,012 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 06:57:49,014 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 06:57:49,016 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 06:57:49,017 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 06:57:49,020 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 06:57:49,024 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 06:57:49,026 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 06:57:49,029 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 06:57:49,030 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 06:57:49,032 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 06:57:49,037 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 06:57:49,038 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 06:57:49,038 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 06:57:49,040 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 06:57:49,041 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 06:57:49,042 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 06:57:49,043 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 06:57:49,044 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 06:57:49,046 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 06:57:49,047 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 06:57:49,049 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 06:57:49,049 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 06:57:49,051 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 06:57:49,051 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 06:57:49,052 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 06:57:49,053 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 06:57:49,055 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 06:57:49,059 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-13 06:57:49,115 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 06:57:49,118 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 06:57:49,120 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 06:57:49,120 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 06:57:49,121 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 06:57:49,121 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 06:57:49,121 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 06:57:49,122 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 06:57:49,122 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 06:57:49,122 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 06:57:49,124 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 06:57:49,124 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 06:57:49,124 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 06:57:49,125 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 06:57:49,125 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 06:57:49,126 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 06:57:49,126 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 06:57:49,127 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 06:57:49,127 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 06:57:49,127 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 06:57:49,128 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 06:57:49,128 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 06:57:49,128 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 06:57:49,128 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 06:57:49,129 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 06:57:49,129 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 06:57:49,129 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 06:57:49,130 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 06:57:49,130 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 06:57:49,132 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 06:57:49,132 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:57:49,133 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 06:57:49,133 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 06:57:49,134 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 06:57:49,134 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 06:57:49,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 06:57:49,135 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 06:57:49,135 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 06:57:49,135 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 06:57:49,135 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_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 23bbff91fb2bcbd238fb97db06c7d4983c05a850 [2021-10-13 06:57:49,484 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 06:57:49,525 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 06:57:49,530 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 06:57:49,531 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 06:57:49,532 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 06:57:49,533 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-13 06:57:49,600 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/e6c33ef65/b9ed383da5ea4f3cbb3398ea0a2217d9/FLAG871eb0833 [2021-10-13 06:57:50,228 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 06:57:50,230 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-13 06:57:50,244 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/e6c33ef65/b9ed383da5ea4f3cbb3398ea0a2217d9/FLAG871eb0833 [2021-10-13 06:57:50,595 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/e6c33ef65/b9ed383da5ea4f3cbb3398ea0a2217d9 [2021-10-13 06:57:50,598 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 06:57:50,600 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 06:57:50,602 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 06:57:50,603 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 06:57:50,607 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 06:57:50,608 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,609 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18c06002 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50, skipping insertion in model container [2021-10-13 06:57:50,609 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,618 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 06:57:50,632 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 06:57:50,825 WARN L228 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_271ec4bd-0807-4e28-9bf2-467023d0f41b/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-13 06:57:50,833 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:57:50,844 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 06:57:50,864 WARN L228 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_271ec4bd-0807-4e28-9bf2-467023d0f41b/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-13 06:57:50,864 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:57:50,882 INFO L208 MainTranslator]: Completed translation [2021-10-13 06:57:50,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50 WrapperNode [2021-10-13 06:57:50,882 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 06:57:50,884 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 06:57:50,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 06:57:50,884 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 06:57:50,895 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,903 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,925 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 06:57:50,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 06:57:50,926 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 06:57:50,926 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 06:57:50,936 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,936 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,938 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,938 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,954 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,955 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,957 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 06:57:50,958 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 06:57:50,958 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 06:57:50,958 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 06:57:50,962 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (1/1) ... [2021-10-13 06:57:50,971 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:57:50,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:57:51,007 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 06:57:51,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 06:57:51,056 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 06:57:51,057 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-13 06:57:51,057 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-13 06:57:51,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 06:57:51,057 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-13 06:57:51,057 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-13 06:57:51,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 06:57:51,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 06:57:51,442 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 06:57:51,442 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-13 06:57:51,445 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:57:51 BoogieIcfgContainer [2021-10-13 06:57:51,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 06:57:51,462 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 06:57:51,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 06:57:51,466 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 06:57:51,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 06:57:50" (1/3) ... [2021-10-13 06:57:51,468 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73db87ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:57:51, skipping insertion in model container [2021-10-13 06:57:51,468 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:50" (2/3) ... [2021-10-13 06:57:51,468 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73db87ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:57:51, skipping insertion in model container [2021-10-13 06:57:51,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:57:51" (3/3) ... [2021-10-13 06:57:51,470 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2021-10-13 06:57:51,476 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 06:57:51,476 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 06:57:51,595 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 06:57:51,607 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, mConcurrency=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 [2021-10-13 06:57:51,607 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 06:57:51,633 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 06:57:51,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-13 06:57:51,640 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:57:51,640 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:57:51,641 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:57:51,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:57:51,655 INFO L82 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2021-10-13 06:57:51,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 06:57:51,677 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481976752] [2021-10-13 06:57:51,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:57:51,679 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 06:57:51,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:57:51,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:57:51,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 06:57:51,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481976752] [2021-10-13 06:57:51,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481976752] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 06:57:51,976 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:57:51,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 06:57:51,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471056985] [2021-10-13 06:57:51,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 06:57:51,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 06:57:52,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 06:57:52,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:57:52,020 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:57:52,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:57:52,106 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-10-13 06:57:52,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:57:52,110 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-13 06:57:52,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:57:52,122 INFO L225 Difference]: With dead ends: 36 [2021-10-13 06:57:52,123 INFO L226 Difference]: Without dead ends: 26 [2021-10-13 06:57:52,128 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.3ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:57:52,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-13 06:57:52,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-13 06:57:52,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:57:52,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-13 06:57:52,187 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-10-13 06:57:52,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:57:52,188 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-13 06:57:52,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:57:52,189 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-13 06:57:52,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 06:57:52,190 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:57:52,191 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:57:52,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 06:57:52,193 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:57:52,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:57:52,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2021-10-13 06:57:52,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 06:57:52,198 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841887040] [2021-10-13 06:57:52,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:57:52,216 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 06:57:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:57:52,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:57:52,305 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 06:57:52,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841887040] [2021-10-13 06:57:52,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841887040] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 06:57:52,306 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:57:52,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 06:57:52,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21310472] [2021-10-13 06:57:52,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 06:57:52,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 06:57:52,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 06:57:52,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:57:52,310 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:57:52,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:57:52,334 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-10-13 06:57:52,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:57:52,335 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-13 06:57:52,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:57:52,337 INFO L225 Difference]: With dead ends: 32 [2021-10-13 06:57:52,337 INFO L226 Difference]: Without dead ends: 28 [2021-10-13 06:57:52,338 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.2ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:57:52,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-10-13 06:57:52,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-10-13 06:57:52,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:57:52,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-13 06:57:52,363 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-10-13 06:57:52,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:57:52,364 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-13 06:57:52,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:57:52,365 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-13 06:57:52,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 06:57:52,366 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:57:52,367 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:57:52,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 06:57:52,368 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:57:52,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:57:52,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2021-10-13 06:57:52,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 06:57:52,369 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245419556] [2021-10-13 06:57:52,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:57:52,370 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 06:57:52,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:57:52,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:57:52,459 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 06:57:52,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245419556] [2021-10-13 06:57:52,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245419556] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 06:57:52,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107564236] [2021-10-13 06:57:52,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:57:52,460 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:57:52,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:57:52,464 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:57:52,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 06:57:52,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:57:52,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:57:52,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:57:52,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:57:52,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:57:53,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:57:53,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107564236] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:57:53,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403362269] [2021-10-13 06:57:53,034 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-13 06:57:53,034 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 06:57:53,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 06:57:53,047 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 06:57:53,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 06:57:53,083 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,090 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 06:57:53,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-10-13 06:57:53,093 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 06:57:53,093 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,094 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-10-13 06:57:53,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-13 06:57:53,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 06:57:53,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 06:57:53,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 06:57:53,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-10-13 06:57:53,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-13 06:57:53,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-13 06:57:53,156 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 06:57:53,158 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 06:57:53,210 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:57:53,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-13 06:57:53,215 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 06:57:53,216 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:119, output treesize:122 [2021-10-13 06:57:53,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 06:57:53,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:57:53,438 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_10| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) 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) [2021-10-13 06:57:53,443 INFO L168 Benchmark]: Toolchain (without parser) took 2842.13 ms. Allocated memory was 121.6 MB in the beginning and 174.1 MB in the end (delta: 52.4 MB). Free memory was 93.3 MB in the beginning and 110.7 MB in the end (delta: -17.4 MB). Peak memory consumption was 34.4 MB. Max. memory is 16.1 GB. [2021-10-13 06:57:53,444 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 121.6 MB. Free memory was 74.7 MB in the beginning and 74.7 MB in the end (delta: 63.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:57:53,444 INFO L168 Benchmark]: CACSL2BoogieTranslator took 280.61 ms. Allocated memory is still 121.6 MB. Free memory was 93.0 MB in the beginning and 96.7 MB in the end (delta: -3.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 06:57:53,445 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.74 ms. Allocated memory is still 121.6 MB. Free memory was 96.7 MB in the beginning and 95.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 06:57:53,445 INFO L168 Benchmark]: Boogie Preprocessor took 31.68 ms. Allocated memory is still 121.6 MB. Free memory was 95.2 MB in the beginning and 94.3 MB in the end (delta: 850.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:57:53,446 INFO L168 Benchmark]: RCFGBuilder took 502.17 ms. Allocated memory is still 121.6 MB. Free memory was 94.1 MB in the beginning and 83.9 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 06:57:53,447 INFO L168 Benchmark]: TraceAbstraction took 1979.23 ms. Allocated memory was 121.6 MB in the beginning and 174.1 MB in the end (delta: 52.4 MB). Free memory was 83.5 MB in the beginning and 110.7 MB in the end (delta: -27.2 MB). Peak memory consumption was 27.6 MB. Max. memory is 16.1 GB. [2021-10-13 06:57:53,451 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 121.6 MB. Free memory was 74.7 MB in the beginning and 74.7 MB in the end (delta: 63.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 280.61 ms. Allocated memory is still 121.6 MB. Free memory was 93.0 MB in the beginning and 96.7 MB in the end (delta: -3.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.74 ms. Allocated memory is still 121.6 MB. Free memory was 96.7 MB in the beginning and 95.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.68 ms. Allocated memory is still 121.6 MB. Free memory was 95.2 MB in the beginning and 94.3 MB in the end (delta: 850.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 502.17 ms. Allocated memory is still 121.6 MB. Free memory was 94.1 MB in the beginning and 83.9 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1979.23 ms. Allocated memory was 121.6 MB in the beginning and 174.1 MB in the end (delta: 52.4 MB). Free memory was 83.5 MB in the beginning and 110.7 MB in the end (delta: -27.2 MB). Peak memory consumption was 27.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_10| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_10|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 06:57:53,497 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 06:57:56,242 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 06:57:56,245 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 06:57:56,301 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 06:57:56,301 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 06:57:56,307 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 06:57:56,309 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 06:57:56,313 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 06:57:56,316 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 06:57:56,323 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 06:57:56,325 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 06:57:56,327 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 06:57:56,327 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 06:57:56,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 06:57:56,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 06:57:56,337 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 06:57:56,339 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 06:57:56,343 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 06:57:56,345 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 06:57:56,347 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 06:57:56,349 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 06:57:56,354 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 06:57:56,355 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 06:57:56,356 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 06:57:56,359 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 06:57:56,360 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 06:57:56,360 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 06:57:56,361 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 06:57:56,362 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 06:57:56,363 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 06:57:56,363 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 06:57:56,364 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 06:57:56,368 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 06:57:56,369 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 06:57:56,371 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 06:57:56,371 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 06:57:56,372 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 06:57:56,372 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 06:57:56,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 06:57:56,374 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 06:57:56,375 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 06:57:56,376 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-13 06:57:56,432 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 06:57:56,432 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 06:57:56,434 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 06:57:56,434 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 06:57:56,435 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 06:57:56,435 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 06:57:56,435 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 06:57:56,435 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 06:57:56,436 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 06:57:56,438 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 06:57:56,439 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 06:57:56,439 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 06:57:56,440 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 06:57:56,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 06:57:56,440 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 06:57:56,440 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 06:57:56,440 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 06:57:56,441 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 06:57:56,441 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 06:57:56,441 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 06:57:56,442 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 06:57:56,442 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 06:57:56,442 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 06:57:56,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 06:57:56,443 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 06:57:56,443 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 06:57:56,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:57:56,444 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 06:57:56,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 06:57:56,444 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 06:57:56,444 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 06:57:56,445 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 06:57:56,445 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 06:57:56,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 06:57:56,446 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 06:57:56,447 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_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 23bbff91fb2bcbd238fb97db06c7d4983c05a850 [2021-10-13 06:57:56,924 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 06:57:56,957 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 06:57:56,960 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 06:57:56,962 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 06:57:56,963 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 06:57:56,966 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-13 06:57:57,055 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/fdef7a0d1/c3aa0cc0210d4a9fa881e8b06dc94492/FLAGa400828a8 [2021-10-13 06:57:57,629 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 06:57:57,629 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-13 06:57:57,635 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/fdef7a0d1/c3aa0cc0210d4a9fa881e8b06dc94492/FLAGa400828a8 [2021-10-13 06:57:58,016 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/data/fdef7a0d1/c3aa0cc0210d4a9fa881e8b06dc94492 [2021-10-13 06:57:58,021 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 06:57:58,024 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 06:57:58,028 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 06:57:58,029 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 06:57:58,033 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 06:57:58,034 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,036 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12a5534e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58, skipping insertion in model container [2021-10-13 06:57:58,037 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,046 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 06:57:58,064 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 06:57:58,234 WARN L228 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_271ec4bd-0807-4e28-9bf2-467023d0f41b/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-13 06:57:58,237 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:57:58,250 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 06:57:58,266 WARN L228 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_271ec4bd-0807-4e28-9bf2-467023d0f41b/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-13 06:57:58,267 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:57:58,282 INFO L208 MainTranslator]: Completed translation [2021-10-13 06:57:58,282 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58 WrapperNode [2021-10-13 06:57:58,282 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 06:57:58,284 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 06:57:58,284 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 06:57:58,284 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 06:57:58,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,308 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,354 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 06:57:58,355 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 06:57:58,355 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 06:57:58,355 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 06:57:58,364 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,365 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,383 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,384 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,390 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,396 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,405 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,408 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 06:57:58,409 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 06:57:58,411 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 06:57:58,411 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 06:57:58,412 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (1/1) ... [2021-10-13 06:57:58,419 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:57:58,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:57:58,446 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 06:57:58,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 06:57:58,504 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 06:57:58,504 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-13 06:57:58,505 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-13 06:57:58,505 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 06:57:58,505 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-13 06:57:58,505 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-13 06:57:58,506 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 06:57:58,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 06:57:58,847 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 06:57:58,860 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-13 06:57:58,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:57:58 BoogieIcfgContainer [2021-10-13 06:57:58,863 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 06:57:58,864 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 06:57:58,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 06:57:58,867 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 06:57:58,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 06:57:58" (1/3) ... [2021-10-13 06:57:58,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6df6ac74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:57:58, skipping insertion in model container [2021-10-13 06:57:58,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:57:58" (2/3) ... [2021-10-13 06:57:58,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6df6ac74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:57:58, skipping insertion in model container [2021-10-13 06:57:58,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:57:58" (3/3) ... [2021-10-13 06:57:58,886 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2021-10-13 06:57:58,891 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 06:57:58,891 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 06:57:59,005 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 06:57:59,026 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, mConcurrency=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 [2021-10-13 06:57:59,026 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 06:57:59,063 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 06:57:59,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 06:57:59,068 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:57:59,069 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:57:59,069 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:57:59,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:57:59,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1014607960, now seen corresponding path program 1 times [2021-10-13 06:57:59,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:57:59,107 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1332809553] [2021-10-13 06:57:59,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:57:59,111 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:57:59,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:57:59,116 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:57:59,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 06:57:59,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:57:59,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 06:57:59,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:57:59,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:57:59,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:57:59,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:57:59,551 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:57:59,552 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1332809553] [2021-10-13 06:57:59,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1332809553] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:57:59,553 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:57:59,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 06:57:59,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511393051] [2021-10-13 06:57:59,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 06:57:59,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:57:59,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 06:57:59,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 06:57:59,590 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:57:59,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:57:59,753 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2021-10-13 06:57:59,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:57:59,756 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 10 [2021-10-13 06:57:59,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:57:59,767 INFO L225 Difference]: With dead ends: 37 [2021-10-13 06:57:59,767 INFO L226 Difference]: Without dead ends: 25 [2021-10-13 06:57:59,771 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 67.3ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 06:57:59,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-10-13 06:57:59,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-10-13 06:57:59,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:57:59,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-13 06:57:59,833 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 10 [2021-10-13 06:57:59,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:57:59,834 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-13 06:57:59,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:57:59,835 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-13 06:57:59,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 06:57:59,837 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:57:59,837 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:57:59,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:00,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:58:00,052 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:00,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:00,058 INFO L82 PathProgramCache]: Analyzing trace with hash 2131805067, now seen corresponding path program 1 times [2021-10-13 06:58:00,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:00,060 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [737189442] [2021-10-13 06:58:00,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:00,061 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:00,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:00,063 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:00,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 06:58:00,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:00,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 06:58:00,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:00,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:58:00,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:00,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:58:00,328 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:00,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [737189442] [2021-10-13 06:58:00,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [737189442] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:58:00,330 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:58:00,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 06:58:00,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921197714] [2021-10-13 06:58:00,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 06:58:00,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:00,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 06:58:00,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 06:58:00,334 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:58:00,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:00,430 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2021-10-13 06:58:00,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:58:00,431 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 11 [2021-10-13 06:58:00,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:00,433 INFO L225 Difference]: With dead ends: 31 [2021-10-13 06:58:00,433 INFO L226 Difference]: Without dead ends: 27 [2021-10-13 06:58:00,434 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.6ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 06:58:00,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-10-13 06:58:00,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-10-13 06:58:00,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:58:00,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-13 06:58:00,443 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 11 [2021-10-13 06:58:00,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:00,444 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-13 06:58:00,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:58:00,445 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-13 06:58:00,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 06:58:00,447 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:00,447 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:00,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:00,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:58:00,661 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:00,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:00,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1494555912, now seen corresponding path program 1 times [2021-10-13 06:58:00,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:00,677 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1525047728] [2021-10-13 06:58:00,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:00,677 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:00,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:00,689 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:00,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 06:58:00,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:00,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:00,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:00,969 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:00,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:01,411 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:01,412 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:01,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1525047728] [2021-10-13 06:58:01,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1525047728] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:01,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [978431772] [2021-10-13 06:58:01,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:01,414 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:01,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:01,421 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:01,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-13 06:58:01,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:01,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:01,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:01,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:58:01,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:02,213 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 06:58:02,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [978431772] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:58:02,214 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-10-13 06:58:02,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 9] imperfect sequences [7, 7] total 22 [2021-10-13 06:58:02,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430292712] [2021-10-13 06:58:02,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 06:58:02,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:02,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 06:58:02,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=408, Unknown=0, NotChecked=0, Total=462 [2021-10-13 06:58:02,227 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 06:58:02,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:02,408 INFO L93 Difference]: Finished difference Result 48 states and 67 transitions. [2021-10-13 06:58:02,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-13 06:58:02,410 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 22 [2021-10-13 06:58:02,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:02,412 INFO L225 Difference]: With dead ends: 48 [2021-10-13 06:58:02,412 INFO L226 Difference]: Without dead ends: 42 [2021-10-13 06:58:02,413 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 564.1ms TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-10-13 06:58:02,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-10-13 06:58:02,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2021-10-13 06:58:02,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-10-13 06:58:02,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 47 transitions. [2021-10-13 06:58:02,437 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 47 transitions. Word has length 22 [2021-10-13 06:58:02,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:02,438 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 47 transitions. [2021-10-13 06:58:02,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 06:58:02,441 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 47 transitions. [2021-10-13 06:58:02,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-13 06:58:02,446 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:02,446 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:02,465 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-10-13 06:58:02,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:02,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:02,861 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:02,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:02,862 INFO L82 PathProgramCache]: Analyzing trace with hash -553851548, now seen corresponding path program 1 times [2021-10-13 06:58:02,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:02,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1089408343] [2021-10-13 06:58:02,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:02,863 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:02,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:02,865 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:02,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 06:58:02,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:02,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:02,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:03,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:03,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:03,446 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:03,446 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:03,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1089408343] [2021-10-13 06:58:03,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1089408343] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:03,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [623850446] [2021-10-13 06:58:03,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:03,448 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:03,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:03,449 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:03,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-10-13 06:58:03,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:03,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:03,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:03,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:03,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:03,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:03,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [623850446] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:03,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107041973] [2021-10-13 06:58:03,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:03,952 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:03,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:03,961 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:03,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 06:58:04,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:04,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:04,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:04,210 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 06:58:04,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:04,515 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:58:04,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107041973] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:58:04,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-13 06:58:04,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 7] imperfect sequences [7, 7, 7, 7] total 14 [2021-10-13 06:58:04,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026707063] [2021-10-13 06:58:04,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 06:58:04,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:04,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 06:58:04,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-10-13 06:58:04,519 INFO L87 Difference]: Start difference. First operand 32 states and 47 transitions. Second operand has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:58:04,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:04,740 INFO L93 Difference]: Finished difference Result 78 states and 136 transitions. [2021-10-13 06:58:04,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 06:58:04,741 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 24 [2021-10-13 06:58:04,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:04,743 INFO L225 Difference]: With dead ends: 78 [2021-10-13 06:58:04,743 INFO L226 Difference]: Without dead ends: 49 [2021-10-13 06:58:04,745 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 171.5ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-10-13 06:58:04,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-13 06:58:04,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2021-10-13 06:58:04,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.25) internal successors, (30), 26 states have internal predecessors, (30), 9 states have call successors, (9), 3 states have call predecessors, (9), 6 states have return successors, (19), 10 states have call predecessors, (19), 9 states have call successors, (19) [2021-10-13 06:58:04,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 58 transitions. [2021-10-13 06:58:04,761 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 58 transitions. Word has length 24 [2021-10-13 06:58:04,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:04,762 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 58 transitions. [2021-10-13 06:58:04,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:58:04,762 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 58 transitions. [2021-10-13 06:58:04,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-13 06:58:04,765 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:04,765 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:58:04,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:04,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:05,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-10-13 06:58:05,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:05,368 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:05,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:05,369 INFO L82 PathProgramCache]: Analyzing trace with hash -650293480, now seen corresponding path program 1 times [2021-10-13 06:58:05,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:05,369 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1047020212] [2021-10-13 06:58:05,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:05,369 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:05,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:05,371 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:05,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 06:58:05,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:05,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:05,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:05,635 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:05,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:05,993 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:05,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:05,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1047020212] [2021-10-13 06:58:05,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1047020212] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:05,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1325933451] [2021-10-13 06:58:05,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:05,994 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:05,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:05,995 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:05,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 06:58:06,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:06,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 06:58:06,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:06,441 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-13 06:58:06,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:06,872 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-13 06:58:06,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1325933451] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-13 06:58:06,873 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2021-10-13 06:58:06,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [7, 7, 12] total 25 [2021-10-13 06:58:06,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131985283] [2021-10-13 06:58:06,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 06:58:06,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:06,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 06:58:06,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-13 06:58:06,875 INFO L87 Difference]: Start difference. First operand 40 states and 58 transitions. Second operand has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:58:06,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:06,956 INFO L93 Difference]: Finished difference Result 62 states and 100 transitions. [2021-10-13 06:58:06,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 06:58:06,958 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2021-10-13 06:58:06,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:06,961 INFO L225 Difference]: With dead ends: 62 [2021-10-13 06:58:06,961 INFO L226 Difference]: Without dead ends: 58 [2021-10-13 06:58:06,962 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 412.6ms TimeCoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-13 06:58:06,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-10-13 06:58:06,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2021-10-13 06:58:06,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 11 states have call successors, (11), 3 states have call predecessors, (11), 8 states have return successors, (33), 14 states have call predecessors, (33), 11 states have call successors, (33) [2021-10-13 06:58:06,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 78 transitions. [2021-10-13 06:58:06,987 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 78 transitions. Word has length 34 [2021-10-13 06:58:06,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:06,988 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 78 transitions. [2021-10-13 06:58:06,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:58:06,988 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 78 transitions. [2021-10-13 06:58:06,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:58:06,991 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:06,992 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:58:07,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:07,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Ended with exit code 0 [2021-10-13 06:58:07,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:07,397 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:07,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:07,397 INFO L82 PathProgramCache]: Analyzing trace with hash 159296083, now seen corresponding path program 1 times [2021-10-13 06:58:07,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:07,398 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1873711543] [2021-10-13 06:58:07,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:07,398 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:07,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:07,399 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:07,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-13 06:58:07,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:07,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:07,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:07,735 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:07,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:08,108 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:08,108 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:08,108 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1873711543] [2021-10-13 06:58:08,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1873711543] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:08,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [239673234] [2021-10-13 06:58:08,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:08,109 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:08,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:08,110 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:08,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-10-13 06:58:08,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:08,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 06:58:08,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:08,648 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-13 06:58:08,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:09,142 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 06:58:09,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [239673234] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:09,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488393495] [2021-10-13 06:58:09,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:09,143 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:09,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:09,149 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:09,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 06:58:09,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:09,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 06:58:09,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:09,458 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-13 06:58:09,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:09,714 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 06:58:09,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488393495] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:09,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:09,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 12, 13, 12, 13] total 27 [2021-10-13 06:58:09,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305232322] [2021-10-13 06:58:09,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-13 06:58:09,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:09,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-13 06:58:09,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=634, Unknown=0, NotChecked=0, Total=702 [2021-10-13 06:58:09,718 INFO L87 Difference]: Start difference. First operand 48 states and 78 transitions. Second operand has 27 states, 22 states have (on average 2.227272727272727) internal successors, (49), 18 states have internal predecessors, (49), 9 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (16), 12 states have call predecessors, (16), 9 states have call successors, (16) [2021-10-13 06:58:11,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:11,082 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2021-10-13 06:58:11,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-10-13 06:58:11,084 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 2.227272727272727) internal successors, (49), 18 states have internal predecessors, (49), 9 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (16), 12 states have call predecessors, (16), 9 states have call successors, (16) Word has length 35 [2021-10-13 06:58:11,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:11,088 INFO L225 Difference]: With dead ends: 86 [2021-10-13 06:58:11,088 INFO L226 Difference]: Without dead ends: 80 [2021-10-13 06:58:11,091 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 1098.4ms TimeCoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2021-10-13 06:58:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-13 06:58:11,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 62. [2021-10-13 06:58:11,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 38 states have internal predecessors, (41), 14 states have call successors, (14), 3 states have call predecessors, (14), 12 states have return successors, (63), 20 states have call predecessors, (63), 14 states have call successors, (63) [2021-10-13 06:58:11,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 118 transitions. [2021-10-13 06:58:11,115 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 118 transitions. Word has length 35 [2021-10-13 06:58:11,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:11,115 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 118 transitions. [2021-10-13 06:58:11,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 2.227272727272727) internal successors, (49), 18 states have internal predecessors, (49), 9 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (16), 12 states have call predecessors, (16), 9 states have call successors, (16) [2021-10-13 06:58:11,116 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 118 transitions. [2021-10-13 06:58:11,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:58:11,120 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:11,120 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:58:11,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:11,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:11,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:11,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:11,739 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:11,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:11,739 INFO L82 PathProgramCache]: Analyzing trace with hash 186789494, now seen corresponding path program 1 times [2021-10-13 06:58:11,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:11,740 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1780953621] [2021-10-13 06:58:11,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:11,740 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:11,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:11,744 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:11,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-10-13 06:58:11,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:11,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:11,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:12,099 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:12,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:12,373 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:12,374 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:12,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1780953621] [2021-10-13 06:58:12,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1780953621] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:12,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1167363250] [2021-10-13 06:58:12,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:12,375 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:12,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:12,377 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:12,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-10-13 06:58:12,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:12,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:12,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:12,885 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:12,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:13,134 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:13,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1167363250] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:13,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723070165] [2021-10-13 06:58:13,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:13,135 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:13,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:13,136 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:13,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-13 06:58:13,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:13,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:13,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:13,570 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:13,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:13,853 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:13,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723070165] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:13,853 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:13,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 10 [2021-10-13 06:58:13,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214269354] [2021-10-13 06:58:13,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 06:58:13,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:13,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 06:58:13,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-10-13 06:58:13,856 INFO L87 Difference]: Start difference. First operand 62 states and 118 transitions. Second operand has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 06:58:14,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:14,044 INFO L93 Difference]: Finished difference Result 72 states and 140 transitions. [2021-10-13 06:58:14,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 06:58:14,044 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) Word has length 35 [2021-10-13 06:58:14,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:14,046 INFO L225 Difference]: With dead ends: 72 [2021-10-13 06:58:14,047 INFO L226 Difference]: Without dead ends: 68 [2021-10-13 06:58:14,047 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 88.3ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-10-13 06:58:14,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-10-13 06:58:14,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 58. [2021-10-13 06:58:14,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 36 states have internal predecessors, (39), 13 states have call successors, (13), 3 states have call predecessors, (13), 11 states have return successors, (57), 18 states have call predecessors, (57), 13 states have call successors, (57) [2021-10-13 06:58:14,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 109 transitions. [2021-10-13 06:58:14,064 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 109 transitions. Word has length 35 [2021-10-13 06:58:14,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:14,064 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 109 transitions. [2021-10-13 06:58:14,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 06:58:14,065 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 109 transitions. [2021-10-13 06:58:14,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:58:14,067 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:14,067 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:58:14,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:14,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:14,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:14,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:58:14,693 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:14,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:14,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1761102882, now seen corresponding path program 2 times [2021-10-13 06:58:14,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:14,694 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1507293322] [2021-10-13 06:58:14,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:14,694 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:14,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:14,695 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:14,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-10-13 06:58:15,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:15,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:15,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:15,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:15,240 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 06:58:15,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:15,789 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:58:15,789 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:15,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1507293322] [2021-10-13 06:58:15,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1507293322] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:15,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [153856698] [2021-10-13 06:58:15,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:15,789 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:15,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:15,800 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:15,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-10-13 06:58:16,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:16,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:16,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:16,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:16,303 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:16,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:16,605 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:16,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [153856698] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:16,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45121992] [2021-10-13 06:58:16,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:16,605 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:16,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:16,609 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:16,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-13 06:58:16,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:16,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:16,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:16,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:17,063 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:17,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:17,266 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:58:17,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45121992] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:17,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:17,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 7, 7, 7] total 17 [2021-10-13 06:58:17,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961103222] [2021-10-13 06:58:17,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 06:58:17,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:17,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 06:58:17,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-10-13 06:58:17,269 INFO L87 Difference]: Start difference. First operand 58 states and 109 transitions. Second operand has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-13 06:58:17,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:17,754 INFO L93 Difference]: Finished difference Result 139 states and 322 transitions. [2021-10-13 06:58:17,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 06:58:17,755 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) Word has length 35 [2021-10-13 06:58:17,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:17,758 INFO L225 Difference]: With dead ends: 139 [2021-10-13 06:58:17,758 INFO L226 Difference]: Without dead ends: 84 [2021-10-13 06:58:17,761 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 405.3ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-10-13 06:58:17,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-10-13 06:58:17,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 62. [2021-10-13 06:58:17,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 38 states have internal predecessors, (41), 14 states have call successors, (14), 3 states have call predecessors, (14), 12 states have return successors, (64), 20 states have call predecessors, (64), 14 states have call successors, (64) [2021-10-13 06:58:17,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 119 transitions. [2021-10-13 06:58:17,788 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 119 transitions. Word has length 35 [2021-10-13 06:58:17,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:17,788 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 119 transitions. [2021-10-13 06:58:17,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-13 06:58:17,789 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 119 transitions. [2021-10-13 06:58:17,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:58:17,792 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:17,792 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:58:17,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:18,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:18,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:18,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:18,405 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:18,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:18,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1656487097, now seen corresponding path program 2 times [2021-10-13 06:58:18,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:18,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1148926764] [2021-10-13 06:58:18,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:18,406 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:18,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:18,407 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:18,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-10-13 06:58:18,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:18,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:18,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:18,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:58:18,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:19,146 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:58:19,147 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:19,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1148926764] [2021-10-13 06:58:19,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1148926764] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:19,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1391090385] [2021-10-13 06:58:19,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:19,148 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:19,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:19,149 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:19,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-10-13 06:58:19,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:19,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:19,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:19,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:19,758 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:58:19,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:20,085 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:58:20,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1391090385] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:20,086 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697300580] [2021-10-13 06:58:20,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:20,086 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:20,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:20,087 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:20,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-13 06:58:20,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:20,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:20,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:20,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:20,737 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:58:20,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:21,102 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:58:21,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697300580] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:21,102 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:21,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 12 [2021-10-13 06:58:21,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780178241] [2021-10-13 06:58:21,104 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 06:58:21,104 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:21,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 06:58:21,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-10-13 06:58:21,105 INFO L87 Difference]: Start difference. First operand 62 states and 119 transitions. Second operand has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-13 06:58:21,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:21,381 INFO L93 Difference]: Finished difference Result 138 states and 334 transitions. [2021-10-13 06:58:21,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 06:58:21,382 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) Word has length 35 [2021-10-13 06:58:21,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:21,385 INFO L225 Difference]: With dead ends: 138 [2021-10-13 06:58:21,385 INFO L226 Difference]: Without dead ends: 79 [2021-10-13 06:58:21,386 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 114.1ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-13 06:58:21,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-10-13 06:58:21,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-10-13 06:58:21,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 46 states have internal predecessors, (48), 17 states have call successors, (17), 3 states have call predecessors, (17), 16 states have return successors, (104), 26 states have call predecessors, (104), 17 states have call successors, (104) [2021-10-13 06:58:21,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 169 transitions. [2021-10-13 06:58:21,408 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 169 transitions. Word has length 35 [2021-10-13 06:58:21,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:21,408 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 169 transitions. [2021-10-13 06:58:21,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-13 06:58:21,409 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 169 transitions. [2021-10-13 06:58:21,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 06:58:21,412 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:21,412 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:21,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:21,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:21,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:22,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:58:22,037 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:22,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:22,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1792243333, now seen corresponding path program 1 times [2021-10-13 06:58:22,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:22,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [187878920] [2021-10-13 06:58:22,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:22,038 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:22,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:22,040 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:22,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-10-13 06:58:22,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:22,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 06:58:22,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:22,710 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-13 06:58:22,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:23,561 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 06:58:23,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:23,561 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [187878920] [2021-10-13 06:58:23,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [187878920] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:23,561 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2126546733] [2021-10-13 06:58:23,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:23,561 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:23,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:23,562 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:23,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-10-13 06:58:24,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:24,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:24,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:24,446 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-13 06:58:24,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:24,965 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-13 06:58:24,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2126546733] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:24,965 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660484439] [2021-10-13 06:58:24,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:24,966 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:24,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:24,968 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:24,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-13 06:58:25,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:25,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:25,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:25,704 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-13 06:58:25,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:26,075 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-13 06:58:26,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660484439] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:26,076 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:26,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 8, 9, 8, 9] total 21 [2021-10-13 06:58:26,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049212935] [2021-10-13 06:58:26,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-13 06:58:26,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:26,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-13 06:58:26,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-10-13 06:58:26,078 INFO L87 Difference]: Start difference. First operand 76 states and 169 transitions. Second operand has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) [2021-10-13 06:58:26,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:26,914 INFO L93 Difference]: Finished difference Result 226 states and 729 transitions. [2021-10-13 06:58:26,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 06:58:26,915 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) Word has length 47 [2021-10-13 06:58:26,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:26,920 INFO L225 Difference]: With dead ends: 226 [2021-10-13 06:58:26,921 INFO L226 Difference]: Without dead ends: 148 [2021-10-13 06:58:26,923 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 640.2ms TimeCoverageRelationStatistics Valid=138, Invalid=732, Unknown=0, NotChecked=0, Total=870 [2021-10-13 06:58:26,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-10-13 06:58:26,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 121. [2021-10-13 06:58:26,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 67 states have (on average 1.1194029850746268) internal successors, (75), 71 states have internal predecessors, (75), 27 states have call successors, (27), 5 states have call predecessors, (27), 26 states have return successors, (221), 44 states have call predecessors, (221), 27 states have call successors, (221) [2021-10-13 06:58:26,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 323 transitions. [2021-10-13 06:58:26,965 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 323 transitions. Word has length 47 [2021-10-13 06:58:26,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:26,965 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 323 transitions. [2021-10-13 06:58:26,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) [2021-10-13 06:58:26,966 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 323 transitions. [2021-10-13 06:58:26,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 06:58:26,970 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:26,971 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:26,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:27,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:27,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:27,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:58:27,574 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:27,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:27,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1482129412, now seen corresponding path program 1 times [2021-10-13 06:58:27,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:27,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1102935220] [2021-10-13 06:58:27,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:27,575 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:27,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:27,576 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:27,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-10-13 06:58:28,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:28,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 06:58:28,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 06:58:28,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:28,964 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 06:58:28,964 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:28,964 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1102935220] [2021-10-13 06:58:28,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1102935220] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:28,965 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [523196141] [2021-10-13 06:58:28,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:28,965 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:28,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:28,975 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:29,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-10-13 06:58:29,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:29,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 06:58:29,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:29,775 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 06:58:29,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:30,227 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 06:58:30,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [523196141] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:30,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060579332] [2021-10-13 06:58:30,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:30,228 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:30,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:30,232 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:30,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-10-13 06:58:30,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:30,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 06:58:30,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:31,002 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 06:58:31,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:31,586 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 06:58:31,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060579332] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:31,586 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:31,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 9, 11, 9, 11] total 14 [2021-10-13 06:58:31,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048754751] [2021-10-13 06:58:31,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 06:58:31,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:31,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 06:58:31,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-10-13 06:58:31,588 INFO L87 Difference]: Start difference. First operand 121 states and 323 transitions. Second operand has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-13 06:58:31,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:31,971 INFO L93 Difference]: Finished difference Result 261 states and 901 transitions. [2021-10-13 06:58:31,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 06:58:31,972 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) Word has length 47 [2021-10-13 06:58:31,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:31,978 INFO L225 Difference]: With dead ends: 261 [2021-10-13 06:58:31,978 INFO L226 Difference]: Without dead ends: 139 [2021-10-13 06:58:31,982 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 174.1ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-10-13 06:58:31,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-10-13 06:58:32,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-10-13 06:58:32,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 77 states have (on average 1.103896103896104) internal successors, (85), 81 states have internal predecessors, (85), 30 states have call successors, (30), 5 states have call predecessors, (30), 31 states have return successors, (291), 52 states have call predecessors, (291), 30 states have call successors, (291) [2021-10-13 06:58:32,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 406 transitions. [2021-10-13 06:58:32,028 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 406 transitions. Word has length 47 [2021-10-13 06:58:32,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:32,029 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 406 transitions. [2021-10-13 06:58:32,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-13 06:58:32,029 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 406 transitions. [2021-10-13 06:58:32,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-10-13 06:58:32,039 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:32,040 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:32,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:32,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:32,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:32,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:32,665 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:32,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:32,665 INFO L82 PathProgramCache]: Analyzing trace with hash 503223527, now seen corresponding path program 3 times [2021-10-13 06:58:32,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:32,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [927764029] [2021-10-13 06:58:32,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 06:58:32,666 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:32,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:32,669 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:32,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-10-13 06:58:33,227 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 06:58:33,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:33,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:33,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:33,447 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 06:58:33,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:33,941 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 06:58:33,941 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:33,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [927764029] [2021-10-13 06:58:33,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [927764029] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:33,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [761795958] [2021-10-13 06:58:33,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 06:58:33,942 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:33,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:33,943 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:33,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-10-13 06:58:34,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 06:58:34,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:34,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:58:34,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:35,060 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 06:58:35,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:35,356 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 06:58:35,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [761795958] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:35,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975463463] [2021-10-13 06:58:35,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 06:58:35,357 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:35,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:35,358 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:35,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-10-13 06:58:36,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 06:58:36,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:36,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 06:58:36,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:36,419 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 06:58:36,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:36,921 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 06:58:36,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975463463] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:36,921 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:36,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 15 [2021-10-13 06:58:36,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895901019] [2021-10-13 06:58:36,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 06:58:36,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:36,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 06:58:36,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-13 06:58:36,923 INFO L87 Difference]: Start difference. First operand 139 states and 406 transitions. Second operand has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-13 06:58:37,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:37,148 INFO L93 Difference]: Finished difference Result 291 states and 1097 transitions. [2021-10-13 06:58:37,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 06:58:37,148 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) Word has length 59 [2021-10-13 06:58:37,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:37,153 INFO L225 Difference]: With dead ends: 291 [2021-10-13 06:58:37,154 INFO L226 Difference]: Without dead ends: 155 [2021-10-13 06:58:37,158 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 309.7ms TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-10-13 06:58:37,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-10-13 06:58:37,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 137. [2021-10-13 06:58:37,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 77 states have (on average 1.103896103896104) internal successors, (85), 80 states have internal predecessors, (85), 29 states have call successors, (29), 6 states have call predecessors, (29), 30 states have return successors, (259), 50 states have call predecessors, (259), 29 states have call successors, (259) [2021-10-13 06:58:37,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 373 transitions. [2021-10-13 06:58:37,193 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 373 transitions. Word has length 59 [2021-10-13 06:58:37,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:37,193 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 373 transitions. [2021-10-13 06:58:37,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-13 06:58:37,194 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 373 transitions. [2021-10-13 06:58:37,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-10-13 06:58:37,199 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:37,199 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:37,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:37,410 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-10-13 06:58:37,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-10-13 06:58:37,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:37,803 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:37,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:37,804 INFO L82 PathProgramCache]: Analyzing trace with hash -841814369, now seen corresponding path program 1 times [2021-10-13 06:58:37,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:37,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1489084188] [2021-10-13 06:58:37,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:37,804 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:37,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:37,806 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:37,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-10-13 06:58:38,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:38,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 06:58:38,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:38,930 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 32 proven. 224 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2021-10-13 06:58:38,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:40,510 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 32 proven. 232 refuted. 0 times theorem prover too weak. 577 trivial. 0 not checked. [2021-10-13 06:58:40,511 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:40,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1489084188] [2021-10-13 06:58:40,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1489084188] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:40,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1419506103] [2021-10-13 06:58:40,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:40,511 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:40,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:40,517 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:40,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-10-13 06:58:41,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:41,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-13 06:58:41,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:41,946 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 87 proven. 169 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2021-10-13 06:58:41,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:43,540 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 102 proven. 126 refuted. 0 times theorem prover too weak. 613 trivial. 0 not checked. [2021-10-13 06:58:43,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1419506103] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:43,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416489896] [2021-10-13 06:58:43,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:58:43,542 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:43,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:43,552 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:43,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-10-13 06:58:44,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:58:44,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 06:58:44,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:45,386 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 258 proven. 73 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2021-10-13 06:58:45,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:47,066 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 258 proven. 99 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-10-13 06:58:47,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416489896] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:47,067 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:47,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 9, 11, 12, 17] total 39 [2021-10-13 06:58:47,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298463040] [2021-10-13 06:58:47,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-13 06:58:47,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:47,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-13 06:58:47,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 06:58:47,071 INFO L87 Difference]: Start difference. First operand 137 states and 373 transitions. Second operand has 39 states, 36 states have (on average 2.9722222222222223) internal successors, (107), 39 states have internal predecessors, (107), 28 states have call successors, (39), 1 states have call predecessors, (39), 17 states have return successors, (54), 23 states have call predecessors, (54), 28 states have call successors, (54) [2021-10-13 06:58:50,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:58:50,590 INFO L93 Difference]: Finished difference Result 386 states and 1510 transitions. [2021-10-13 06:58:50,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-10-13 06:58:50,591 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 2.9722222222222223) internal successors, (107), 39 states have internal predecessors, (107), 28 states have call successors, (39), 1 states have call predecessors, (39), 17 states have return successors, (54), 23 states have call predecessors, (54), 28 states have call successors, (54) Word has length 168 [2021-10-13 06:58:50,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:58:50,601 INFO L225 Difference]: With dead ends: 386 [2021-10-13 06:58:50,601 INFO L226 Difference]: Without dead ends: 244 [2021-10-13 06:58:50,608 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1032 GetRequests, 965 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 923 ImplicationChecksByTransitivity, 2041.8ms TimeCoverageRelationStatistics Valid=646, Invalid=4046, Unknown=0, NotChecked=0, Total=4692 [2021-10-13 06:58:50,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-10-13 06:58:50,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 193. [2021-10-13 06:58:50,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 118 states have (on average 1.11864406779661) internal successors, (132), 117 states have internal predecessors, (132), 33 states have call successors, (33), 14 states have call predecessors, (33), 41 states have return successors, (343), 61 states have call predecessors, (343), 33 states have call successors, (343) [2021-10-13 06:58:50,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 508 transitions. [2021-10-13 06:58:50,674 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 508 transitions. Word has length 168 [2021-10-13 06:58:50,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:58:50,676 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 508 transitions. [2021-10-13 06:58:50,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 36 states have (on average 2.9722222222222223) internal successors, (107), 39 states have internal predecessors, (107), 28 states have call successors, (39), 1 states have call predecessors, (39), 17 states have return successors, (54), 23 states have call predecessors, (54), 28 states have call successors, (54) [2021-10-13 06:58:50,676 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 508 transitions. [2021-10-13 06:58:50,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-10-13 06:58:50,682 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:58:50,682 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:58:50,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:50,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-10-13 06:58:51,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-10-13 06:58:51,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:51,300 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:58:51,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:58:51,301 INFO L82 PathProgramCache]: Analyzing trace with hash 724043200, now seen corresponding path program 2 times [2021-10-13 06:58:51,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:58:51,301 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2078633670] [2021-10-13 06:58:51,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:51,302 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:58:51,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:58:51,303 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:58:51,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-10-13 06:58:52,129 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:52,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:52,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:58:52,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:52,365 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2021-10-13 06:58:52,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:53,029 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-10-13 06:58:53,030 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:58:53,030 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2078633670] [2021-10-13 06:58:53,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2078633670] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:53,031 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [365160701] [2021-10-13 06:58:53,031 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:53,031 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:58:53,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:58:53,034 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:58:53,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-10-13 06:58:54,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:54,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:54,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 28 conjunts are in the unsatisfiable core [2021-10-13 06:58:54,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:55,295 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-10-13 06:58:55,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:57,172 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 32 proven. 46 refuted. 0 times theorem prover too weak. 104 trivial. 0 not checked. [2021-10-13 06:58:57,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [365160701] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:57,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831268167] [2021-10-13 06:58:57,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:58:57,173 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:58:57,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:58:57,174 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:58:57,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-10-13 06:58:58,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:58:58,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:58:58,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 06:58:58,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:58:58,819 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 117 proven. 12 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-10-13 06:58:58,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:58:59,593 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 41 proven. 43 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-10-13 06:58:59,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831268167] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:58:59,596 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:58:59,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 21, 26, 10, 9] total 56 [2021-10-13 06:58:59,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679085007] [2021-10-13 06:58:59,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-10-13 06:58:59,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:58:59,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-10-13 06:58:59,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=2888, Unknown=0, NotChecked=0, Total=3080 [2021-10-13 06:58:59,603 INFO L87 Difference]: Start difference. First operand 193 states and 508 transitions. Second operand has 56 states, 44 states have (on average 2.2954545454545454) internal successors, (101), 32 states have internal predecessors, (101), 21 states have call successors, (33), 2 states have call predecessors, (33), 20 states have return successors, (52), 34 states have call predecessors, (52), 21 states have call successors, (52) [2021-10-13 06:59:07,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:59:07,732 INFO L93 Difference]: Finished difference Result 496 states and 1846 transitions. [2021-10-13 06:59:07,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-10-13 06:59:07,733 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 44 states have (on average 2.2954545454545454) internal successors, (101), 32 states have internal predecessors, (101), 21 states have call successors, (33), 2 states have call predecessors, (33), 20 states have return successors, (52), 34 states have call predecessors, (52), 21 states have call successors, (52) Word has length 86 [2021-10-13 06:59:07,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:59:07,742 INFO L225 Difference]: With dead ends: 496 [2021-10-13 06:59:07,742 INFO L226 Difference]: Without dead ends: 292 [2021-10-13 06:59:07,756 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 456 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3513 ImplicationChecksByTransitivity, 6891.1ms TimeCoverageRelationStatistics Valid=1124, Invalid=13882, Unknown=0, NotChecked=0, Total=15006 [2021-10-13 06:59:07,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-10-13 06:59:07,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 225. [2021-10-13 06:59:07,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 140 states have (on average 1.1571428571428573) internal successors, (162), 140 states have internal predecessors, (162), 41 states have call successors, (41), 21 states have call predecessors, (41), 43 states have return successors, (294), 63 states have call predecessors, (294), 41 states have call successors, (294) [2021-10-13 06:59:07,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 497 transitions. [2021-10-13 06:59:07,799 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 497 transitions. Word has length 86 [2021-10-13 06:59:07,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:59:07,799 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 497 transitions. [2021-10-13 06:59:07,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 44 states have (on average 2.2954545454545454) internal successors, (101), 32 states have internal predecessors, (101), 21 states have call successors, (33), 2 states have call predecessors, (33), 20 states have return successors, (52), 34 states have call predecessors, (52), 21 states have call successors, (52) [2021-10-13 06:59:07,800 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 497 transitions. [2021-10-13 06:59:07,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-10-13 06:59:07,806 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:59:07,807 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 10, 9, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:59:07,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-10-13 06:59:08,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-10-13 06:59:08,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-10-13 06:59:08,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:59:08,424 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:59:08,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:59:08,424 INFO L82 PathProgramCache]: Analyzing trace with hash 2007696498, now seen corresponding path program 3 times [2021-10-13 06:59:08,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:59:08,425 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [737837406] [2021-10-13 06:59:08,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 06:59:08,425 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:59:08,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:59:08,427 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:59:08,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-10-13 06:59:09,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 06:59:09,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:59:09,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:59:09,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:59:09,811 INFO L134 CoverageAnalysis]: Checked inductivity of 865 backedges. 198 proven. 0 refuted. 0 times theorem prover too weak. 667 trivial. 0 not checked. [2021-10-13 06:59:09,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:59:10,813 INFO L134 CoverageAnalysis]: Checked inductivity of 865 backedges. 190 proven. 0 refuted. 0 times theorem prover too weak. 675 trivial. 0 not checked. [2021-10-13 06:59:10,814 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:59:10,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [737837406] [2021-10-13 06:59:10,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [737837406] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:59:10,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:59:10,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 9] imperfect sequences [] total 12 [2021-10-13 06:59:10,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140962004] [2021-10-13 06:59:10,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 06:59:10,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:59:10,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 06:59:10,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-10-13 06:59:10,816 INFO L87 Difference]: Start difference. First operand 225 states and 497 transitions. Second operand has 12 states, 9 states have (on average 4.111111111111111) internal successors, (37), 11 states have internal predecessors, (37), 5 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (11), 3 states have call predecessors, (11), 5 states have call successors, (11) [2021-10-13 06:59:11,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:59:11,080 INFO L93 Difference]: Finished difference Result 390 states and 1016 transitions. [2021-10-13 06:59:11,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 06:59:11,081 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 4.111111111111111) internal successors, (37), 11 states have internal predecessors, (37), 5 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (11), 3 states have call predecessors, (11), 5 states have call successors, (11) Word has length 172 [2021-10-13 06:59:11,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:59:11,086 INFO L225 Difference]: With dead ends: 390 [2021-10-13 06:59:11,086 INFO L226 Difference]: Without dead ends: 154 [2021-10-13 06:59:11,090 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 204.0ms TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-10-13 06:59:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-10-13 06:59:11,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-10-13 06:59:11,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 96 states have (on average 1.1041666666666667) internal successors, (106), 94 states have internal predecessors, (106), 29 states have call successors, (29), 16 states have call predecessors, (29), 27 states have return successors, (182), 42 states have call predecessors, (182), 29 states have call successors, (182) [2021-10-13 06:59:11,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 317 transitions. [2021-10-13 06:59:11,112 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 317 transitions. Word has length 172 [2021-10-13 06:59:11,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:59:11,113 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 317 transitions. [2021-10-13 06:59:11,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 4.111111111111111) internal successors, (37), 11 states have internal predecessors, (37), 5 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (11), 3 states have call predecessors, (11), 5 states have call successors, (11) [2021-10-13 06:59:11,113 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 317 transitions. [2021-10-13 06:59:11,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-10-13 06:59:11,118 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:59:11,118 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:59:11,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-10-13 06:59:11,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:59:11,332 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:59:11,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:59:11,333 INFO L82 PathProgramCache]: Analyzing trace with hash 125462779, now seen corresponding path program 4 times [2021-10-13 06:59:11,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:59:11,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2055525870] [2021-10-13 06:59:11,334 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 06:59:11,334 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:59:11,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:59:11,335 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:59:11,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-10-13 06:59:12,476 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 06:59:12,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:59:12,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:59:12,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:59:12,766 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 76 proven. 23 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-10-13 06:59:12,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:59:13,287 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 76 proven. 25 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2021-10-13 06:59:13,288 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:59:13,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2055525870] [2021-10-13 06:59:13,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2055525870] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:59:13,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1174903545] [2021-10-13 06:59:13,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 06:59:13,288 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:59:13,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:59:13,297 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:59:13,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-10-13 06:59:15,044 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 06:59:15,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:59:15,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-13 06:59:15,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:59:15,362 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 67 proven. 50 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-10-13 06:59:15,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:59:16,167 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 76 proven. 25 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2021-10-13 06:59:16,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1174903545] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:59:16,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352549319] [2021-10-13 06:59:16,168 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 06:59:16,168 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:59:16,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:59:16,169 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:59:16,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-10-13 06:59:17,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 06:59:17,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:59:17,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 06:59:17,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:59:18,427 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 101 proven. 22 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-10-13 06:59:18,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:59:20,269 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 98 proven. 27 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2021-10-13 06:59:20,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352549319] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:59:20,270 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:59:20,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 11, 13] total 24 [2021-10-13 06:59:20,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081749223] [2021-10-13 06:59:20,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-13 06:59:20,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:59:20,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-13 06:59:20,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-10-13 06:59:20,272 INFO L87 Difference]: Start difference. First operand 153 states and 317 transitions. Second operand has 24 states, 20 states have (on average 3.15) internal successors, (63), 24 states have internal predecessors, (63), 12 states have call successors, (24), 1 states have call predecessors, (24), 8 states have return successors, (29), 16 states have call predecessors, (29), 12 states have call successors, (29) [2021-10-13 06:59:20,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:59:20,942 INFO L93 Difference]: Finished difference Result 297 states and 650 transitions. [2021-10-13 06:59:20,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-13 06:59:20,943 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 20 states have (on average 3.15) internal successors, (63), 24 states have internal predecessors, (63), 12 states have call successors, (24), 1 states have call predecessors, (24), 8 states have return successors, (29), 16 states have call predecessors, (29), 12 states have call successors, (29) Word has length 110 [2021-10-13 06:59:20,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:59:20,946 INFO L225 Difference]: With dead ends: 297 [2021-10-13 06:59:20,946 INFO L226 Difference]: Without dead ends: 149 [2021-10-13 06:59:20,949 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 869.3ms TimeCoverageRelationStatistics Valid=198, Invalid=858, Unknown=0, NotChecked=0, Total=1056 [2021-10-13 06:59:20,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-10-13 06:59:20,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 138. [2021-10-13 06:59:20,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 90 states have (on average 1.1) internal successors, (99), 89 states have internal predecessors, (99), 22 states have call successors, (22), 14 states have call predecessors, (22), 25 states have return successors, (116), 34 states have call predecessors, (116), 22 states have call successors, (116) [2021-10-13 06:59:20,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 237 transitions. [2021-10-13 06:59:20,977 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 237 transitions. Word has length 110 [2021-10-13 06:59:20,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:59:20,978 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 237 transitions. [2021-10-13 06:59:20,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 20 states have (on average 3.15) internal successors, (63), 24 states have internal predecessors, (63), 12 states have call successors, (24), 1 states have call predecessors, (24), 8 states have return successors, (29), 16 states have call predecessors, (29), 12 states have call successors, (29) [2021-10-13 06:59:20,979 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 237 transitions. [2021-10-13 06:59:20,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-10-13 06:59:20,981 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:59:20,981 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:59:21,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-10-13 06:59:21,200 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-10-13 06:59:21,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-10-13 06:59:21,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:59:21,597 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:59:21,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:59:21,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1106940688, now seen corresponding path program 5 times [2021-10-13 06:59:21,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:59:21,598 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [458614075] [2021-10-13 06:59:21,598 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-13 06:59:21,598 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:59:21,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:59:21,599 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:59:21,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-10-13 06:59:23,053 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-10-13 06:59:23,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-10-13 06:59:23,053 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-13 06:59:23,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-13 06:59:23,266 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-13 06:59:23,267 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-13 06:59:23,268 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-13 06:59:23,290 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-10-13 06:59:23,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:59:23,492 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 06:59:23,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 06:59:23 BoogieIcfgContainer [2021-10-13 06:59:23,596 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 06:59:23,596 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 06:59:23,596 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 06:59:23,597 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 06:59:23,597 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:57:58" (3/4) ... [2021-10-13 06:59:23,599 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-13 06:59:23,672 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 06:59:23,673 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 06:59:23,674 INFO L168 Benchmark]: Toolchain (without parser) took 85649.55 ms. Allocated memory was 52.4 MB in the beginning and 161.5 MB in the end (delta: 109.1 MB). Free memory was 29.4 MB in the beginning and 40.7 MB in the end (delta: -11.3 MB). Peak memory consumption was 97.3 MB. Max. memory is 16.1 GB. [2021-10-13 06:59:23,675 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 52.4 MB. Free memory was 33.8 MB in the beginning and 33.8 MB in the end (delta: 38.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:59:23,675 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.53 ms. Allocated memory is still 52.4 MB. Free memory was 29.2 MB in the beginning and 32.7 MB in the end (delta: -3.5 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. [2021-10-13 06:59:23,676 INFO L168 Benchmark]: Boogie Procedure Inliner took 71.00 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 32.7 MB in the beginning and 46.4 MB in the end (delta: -13.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 06:59:23,676 INFO L168 Benchmark]: Boogie Preprocessor took 53.53 ms. Allocated memory is still 62.9 MB. Free memory was 46.4 MB in the beginning and 45.4 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:59:23,677 INFO L168 Benchmark]: RCFGBuilder took 453.34 ms. Allocated memory is still 62.9 MB. Free memory was 45.4 MB in the beginning and 35.5 MB in the end (delta: 9.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 06:59:23,677 INFO L168 Benchmark]: TraceAbstraction took 84731.36 ms. Allocated memory was 62.9 MB in the beginning and 161.5 MB in the end (delta: 98.6 MB). Free memory was 35.0 MB in the beginning and 46.4 MB in the end (delta: -11.3 MB). Peak memory consumption was 89.3 MB. Max. memory is 16.1 GB. [2021-10-13 06:59:23,678 INFO L168 Benchmark]: Witness Printer took 76.52 ms. Allocated memory is still 161.5 MB. Free memory was 46.4 MB in the beginning and 40.7 MB in the end (delta: 5.7 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-13 06:59:23,680 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 52.4 MB. Free memory was 33.8 MB in the beginning and 33.8 MB in the end (delta: 38.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 254.53 ms. Allocated memory is still 52.4 MB. Free memory was 29.2 MB in the beginning and 32.7 MB in the end (delta: -3.5 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 71.00 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 32.7 MB in the beginning and 46.4 MB in the end (delta: -13.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 53.53 ms. Allocated memory is still 62.9 MB. Free memory was 46.4 MB in the beginning and 45.4 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 453.34 ms. Allocated memory is still 62.9 MB. Free memory was 45.4 MB in the beginning and 35.5 MB in the end (delta: 9.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 84731.36 ms. Allocated memory was 62.9 MB in the beginning and 161.5 MB in the end (delta: 98.6 MB). Free memory was 35.0 MB in the beginning and 46.4 MB in the end (delta: -11.3 MB). Peak memory consumption was 89.3 MB. Max. memory is 16.1 GB. * Witness Printer took 76.52 ms. Allocated memory is still 161.5 MB. Free memory was 46.4 MB in the beginning and 40.7 MB in the end (delta: 5.7 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 5; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L10] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L12] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L20] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L22] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 5 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 84487.8ms, OverallIterations: 17, TraceHistogramMax: 15, EmptinessCheckTime: 95.3ms, AutomataDifference: 17271.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 424 SDtfs, 606 SDslu, 3450 SDs, 0 SdLazy, 7136 SolverSat, 985 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 7650.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4792 GetRequests, 4346 SyntacticMatches, 0 SemanticMatches, 446 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5256 ImplicationChecksByTransitivity, 14099.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=225occurred in iteration=14, InterpolantAutomatonStates: 264, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 482.5ms AutomataMinimizationTime, 16 MinimizatonAttempts, 259 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 344.3ms SsaConstructionTime, 1393.2ms SatisfiabilityAnalysisTime, 33646.7ms InterpolantComputationTime, 2447 NumberOfCodeBlocks, 2252 NumberOfCodeBlocksAsserted, 63 NumberOfCheckSat, 4616 ConstructedInterpolants, 0 QuantifiedInterpolants, 10172 SizeOfPredicates, 118 NumberOfNonLiveVariables, 3768 ConjunctsInSsa, 365 ConjunctsInUnsatCore, 80 InterpolantComputations, 11 PerfectInterpolantSequences, 9519/11326 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-13 06:59:23,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_271ec4bd-0807-4e28-9bf2-467023d0f41b/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...