./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7 --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 2abfa4882ab8ec6bd7a33a5fbeaa8a88ba40a897019218fc162e52833c89454b --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:53:21,470 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:53:21,472 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:53:21,502 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:53:21,503 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:53:21,504 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:53:21,506 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:53:21,508 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:53:21,510 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:53:21,511 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:53:21,512 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:53:21,513 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:53:21,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:53:21,515 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:53:21,516 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:53:21,517 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:53:21,518 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:53:21,519 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:53:21,521 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:53:21,523 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:53:21,525 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:53:21,526 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:53:21,527 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:53:21,528 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:53:21,532 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:53:21,532 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:53:21,533 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:53:21,534 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:53:21,534 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:53:21,535 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:53:21,536 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:53:21,537 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:53:21,537 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:53:21,538 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:53:21,539 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:53:21,540 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:53:21,540 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:53:21,541 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:53:21,541 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:53:21,542 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:53:21,542 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:53:21,547 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:53:21,571 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:53:21,572 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:53:21,572 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:53:21,572 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:53:21,573 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:53:21,573 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:53:21,573 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:53:21,574 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:53:21,574 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:53:21,574 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:53:21,574 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:53:21,574 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:53:21,575 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:53:21,575 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:53:21,575 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:53:21,575 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:53:21,575 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:53:21,576 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:53:21,576 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:53:21,577 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:53:21,577 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:53:21,577 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:53:21,577 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:53:21,577 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:53:21,578 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:53:21,578 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:53:21,578 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:53:21,578 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:53:21,579 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:53:21,579 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:53:21,579 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:53:21,579 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:53:21,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:53:21,580 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:53:21,580 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:53:21,580 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:53:21,580 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:53:21,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:53:21,581 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:53:21,581 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:53:21,581 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:53:21,581 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_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2abfa4882ab8ec6bd7a33a5fbeaa8a88ba40a897019218fc162e52833c89454b [2021-11-25 17:53:21,829 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:53:21,852 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:53:21,855 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:53:21,856 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:53:21,857 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:53:21,858 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c [2021-11-25 17:53:21,929 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/5dc5236d8/0bb168c835404a678ae58ccd55459e6c/FLAG3b56761c5 [2021-11-25 17:53:22,354 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:53:22,354 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c [2021-11-25 17:53:22,362 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/5dc5236d8/0bb168c835404a678ae58ccd55459e6c/FLAG3b56761c5 [2021-11-25 17:53:22,722 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/5dc5236d8/0bb168c835404a678ae58ccd55459e6c [2021-11-25 17:53:22,724 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:53:22,726 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:53:22,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:53:22,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:53:22,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:53:22,736 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:53:22" (1/1) ... [2021-11-25 17:53:22,738 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@144661c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:22, skipping insertion in model container [2021-11-25 17:53:22,741 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:53:22" (1/1) ... [2021-11-25 17:53:22,750 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:53:22,776 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:53:22,968 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c[755,768] [2021-11-25 17:53:23,032 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:53:23,047 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:53:23,064 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c[755,768] [2021-11-25 17:53:23,128 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:53:23,143 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:53:23,144 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23 WrapperNode [2021-11-25 17:53:23,144 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:53:23,145 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:53:23,146 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:53:23,146 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:53:23,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,175 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,199 INFO L137 Inliner]: procedures = 17, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 53 [2021-11-25 17:53:23,200 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:53:23,201 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:53:23,201 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:53:23,201 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:53:23,211 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,212 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,227 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,255 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,257 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:53:23,266 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:53:23,266 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:53:23,266 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:53:23,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (1/1) ... [2021-11-25 17:53:23,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:53:23,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:53:23,307 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:53:23,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:53:23,358 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:53:23,359 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:53:23,359 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-25 17:53:23,359 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-25 17:53:23,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:53:23,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:53:23,359 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2021-11-25 17:53:23,359 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2021-11-25 17:53:23,360 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:53:23,360 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:53:23,416 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:53:23,418 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:53:23,633 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:53:23,691 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:53:23,692 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 17:53:23,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:53:23 BoogieIcfgContainer [2021-11-25 17:53:23,701 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:53:23,703 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:53:23,703 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:53:23,723 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:53:23,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:53:22" (1/3) ... [2021-11-25 17:53:23,724 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b925a86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:53:23, skipping insertion in model container [2021-11-25 17:53:23,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:23" (2/3) ... [2021-11-25 17:53:23,725 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b925a86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:53:23, skipping insertion in model container [2021-11-25 17:53:23,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:53:23" (3/3) ... [2021-11-25 17:53:23,726 INFO L111 eAbstractionObserver]: Analyzing ICFG soft_float_4-2a.c.cil.c [2021-11-25 17:53:23,732 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:53:23,733 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:53:23,807 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:53:23,817 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:53:23,818 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:53:23,835 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 30 states have (on average 1.4666666666666666) internal successors, (44), 31 states have internal predecessors, (44), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 17:53:23,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 17:53:23,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:23,846 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:23,846 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:23,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:23,852 INFO L85 PathProgramCache]: Analyzing trace with hash 854723944, now seen corresponding path program 1 times [2021-11-25 17:53:23,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:53:23,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79017099] [2021-11-25 17:53:23,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:23,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:53:24,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:24,342 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:53:24,342 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:53:24,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79017099] [2021-11-25 17:53:24,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79017099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:53:24,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:53:24,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-25 17:53:24,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481361297] [2021-11-25 17:53:24,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:53:24,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 17:53:24,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:53:24,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 17:53:24,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:53:24,389 INFO L87 Difference]: Start difference. First operand has 43 states, 30 states have (on average 1.4666666666666666) internal successors, (44), 31 states have internal predecessors, (44), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 10 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 17:53:24,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:24,589 INFO L93 Difference]: Finished difference Result 108 states and 164 transitions. [2021-11-25 17:53:24,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 17:53:24,592 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-11-25 17:53:24,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:24,602 INFO L225 Difference]: With dead ends: 108 [2021-11-25 17:53:24,602 INFO L226 Difference]: Without dead ends: 61 [2021-11-25 17:53:24,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-25 17:53:24,610 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 16 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:24,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 355 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:53:24,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-25 17:53:24,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2021-11-25 17:53:24,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 38 states have internal predecessors, (47), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-25 17:53:24,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 72 transitions. [2021-11-25 17:53:24,682 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 72 transitions. Word has length 26 [2021-11-25 17:53:24,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:24,683 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 72 transitions. [2021-11-25 17:53:24,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 17:53:24,684 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 72 transitions. [2021-11-25 17:53:24,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 17:53:24,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:24,688 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:24,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:53:24,690 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:24,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:24,691 INFO L85 PathProgramCache]: Analyzing trace with hash 724986461, now seen corresponding path program 1 times [2021-11-25 17:53:24,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:53:24,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576119341] [2021-11-25 17:53:24,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:24,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:53:24,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:24,886 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:53:24,887 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:53:24,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576119341] [2021-11-25 17:53:24,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576119341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:53:24,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676438733] [2021-11-25 17:53:24,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:24,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:53:24,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:53:24,898 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:53:24,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:53:24,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:24,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 17:53:25,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:25,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:53:25,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:53:25,652 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:53:25,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676438733] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:53:25,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [320591673] [2021-11-25 17:53:25,682 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 17:53:25,683 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:53:25,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:53:25,694 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:53:25,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:53:26,257 INFO L197 IcfgInterpreter]: Interpreting procedure addflt with input of size 17 for LOIs [2021-11-25 17:53:27,291 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 66 for LOIs [2021-11-25 17:53:28,450 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-25 17:53:28,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:53:48,839 WARN L227 SmtUtils]: Spent 8.17s on a formula simplification. DAG size of input: 71 DAG size of output: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:53:48,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '477#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 Int) (aux_div_v_addflt_~b_BEFORE_CALL_1_42 Int) (aux_mod_v_addflt_~a_BEFORE_CALL_1_42 Int) (aux_div_v_addflt_~a_BEFORE_CALL_1_42 Int) (aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 Int)) (and (<= 0 aux_mod_v_addflt_~a_BEFORE_CALL_1_42) (<= 0 (+ aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 (* 4294967296 aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53))) (or (and (= (+ (* 4294967296 aux_div_v_addflt_~a_BEFORE_CALL_1_42) aux_mod_v_addflt_~a_BEFORE_CALL_1_42) 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= |__VERIFIER_assert_#in~cond| (ite (<= (ite (<= (mod (div (+ (* aux_div_v_addflt_~b_BEFORE_CALL_1_42 4294967296) aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 (* aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 4294967296)) 16777216) 4294967296) 2147483647) (mod (div (+ (* aux_div_v_addflt_~b_BEFORE_CALL_1_42 4294967296) aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 (* aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 4294967296)) 16777216) 4294967296) (+ (mod (div (+ (* aux_div_v_addflt_~b_BEFORE_CALL_1_42 4294967296) aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 (* aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 4294967296)) 16777216) 4294967296) (- 4294967296))) (ite (<= (mod (div (+ aux_mod_v_addflt_~a_BEFORE_CALL_1_42 (* aux_div_v_addflt_~a_BEFORE_CALL_1_42 4294967296)) 16777216) 4294967296) 2147483647) (mod (div (+ aux_mod_v_addflt_~a_BEFORE_CALL_1_42 (* aux_div_v_addflt_~a_BEFORE_CALL_1_42 4294967296)) 16777216) 4294967296) (+ (mod (div (+ aux_mod_v_addflt_~a_BEFORE_CALL_1_42 (* aux_div_v_addflt_~a_BEFORE_CALL_1_42 4294967296)) 16777216) 4294967296) (- 4294967296)))) 1 0)) (< (+ aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 (* 4294967296 aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53)) 4294967296) (<= aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 aux_mod_v_addflt_~a_BEFORE_CALL_1_42) (< aux_mod_v_addflt_~a_BEFORE_CALL_1_42 4294967296) (not (= (+ aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 (* 4294967296 aux_div_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53)) 0)) (<= 0 aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53) (< aux_mod_aux_mod_v_addflt_~b_BEFORE_CALL_1_42_53 4294967296))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 17:53:48,847 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:53:48,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:53:48,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8] total 15 [2021-11-25 17:53:48,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16173627] [2021-11-25 17:53:48,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:53:48,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 17:53:48,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:53:48,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 17:53:48,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1001, Unknown=1, NotChecked=0, Total=1122 [2021-11-25 17:53:48,855 INFO L87 Difference]: Start difference. First operand 53 states and 72 transitions. Second operand has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 11 states have internal predecessors, (27), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:53:49,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:49,222 INFO L93 Difference]: Finished difference Result 134 states and 185 transitions. [2021-11-25 17:53:49,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 17:53:49,223 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 11 states have internal predecessors, (27), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 30 [2021-11-25 17:53:49,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:49,226 INFO L225 Difference]: With dead ends: 134 [2021-11-25 17:53:49,226 INFO L226 Difference]: Without dead ends: 83 [2021-11-25 17:53:49,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=170, Invalid=1469, Unknown=1, NotChecked=0, Total=1640 [2021-11-25 17:53:49,229 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 34 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:49,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 383 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:53:49,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-25 17:53:49,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 67. [2021-11-25 17:53:49,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 46 states have (on average 1.2391304347826086) internal successors, (57), 48 states have internal predecessors, (57), 12 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (17), 11 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-25 17:53:49,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2021-11-25 17:53:49,244 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 30 [2021-11-25 17:53:49,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:49,244 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2021-11-25 17:53:49,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 11 states have internal predecessors, (27), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:53:49,245 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2021-11-25 17:53:49,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 17:53:49,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:49,247 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:49,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:53:49,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 17:53:49,475 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:49,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:49,475 INFO L85 PathProgramCache]: Analyzing trace with hash 938214045, now seen corresponding path program 2 times [2021-11-25 17:53:49,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:53:49,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975671640] [2021-11-25 17:53:49,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:49,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:53:49,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:49,630 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:53:49,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:53:49,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975671640] [2021-11-25 17:53:49,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975671640] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:53:49,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:53:49,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 17:53:49,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130056226] [2021-11-25 17:53:49,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:53:49,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:53:49,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:53:49,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:53:49,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:53:49,636 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:53:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:49,736 INFO L93 Difference]: Finished difference Result 98 states and 125 transitions. [2021-11-25 17:53:49,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:53:49,736 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-11-25 17:53:49,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:49,742 INFO L225 Difference]: With dead ends: 98 [2021-11-25 17:53:49,742 INFO L226 Difference]: Without dead ends: 77 [2021-11-25 17:53:49,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:53:49,747 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 8 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:49,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 328 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:53:49,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-25 17:53:49,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 67. [2021-11-25 17:53:49,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 46 states have (on average 1.2391304347826086) internal successors, (57), 48 states have internal predecessors, (57), 12 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (17), 11 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-25 17:53:49,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2021-11-25 17:53:49,770 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 30 [2021-11-25 17:53:49,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:49,771 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2021-11-25 17:53:49,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:53:49,771 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2021-11-25 17:53:49,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 17:53:49,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:49,779 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 17:53:49,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:53:49,780 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:49,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:49,780 INFO L85 PathProgramCache]: Analyzing trace with hash -848420913, now seen corresponding path program 1 times [2021-11-25 17:53:49,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:53:49,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403793014] [2021-11-25 17:53:49,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:49,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:53:49,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:50,239 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:53:50,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:53:50,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403793014] [2021-11-25 17:53:50,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403793014] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:53:50,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:53:50,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-25 17:53:50,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811937550] [2021-11-25 17:53:50,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:53:50,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 17:53:50,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:53:50,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 17:53:50,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=235, Unknown=0, NotChecked=0, Total=272 [2021-11-25 17:53:50,241 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand has 17 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 5 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 17:53:50,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:50,531 INFO L93 Difference]: Finished difference Result 83 states and 105 transitions. [2021-11-25 17:53:50,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 17:53:50,532 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 5 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2021-11-25 17:53:50,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:50,533 INFO L225 Difference]: With dead ends: 83 [2021-11-25 17:53:50,533 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 17:53:50,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-11-25 17:53:50,535 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 21 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:50,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 483 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:53:50,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 17:53:50,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2021-11-25 17:53:50,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 40 states have internal predecessors, (49), 10 states have call successors, (10), 5 states have call predecessors, (10), 6 states have return successors, (13), 9 states have call predecessors, (13), 9 states have call successors, (13) [2021-11-25 17:53:50,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 72 transitions. [2021-11-25 17:53:50,545 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 72 transitions. Word has length 35 [2021-11-25 17:53:50,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:50,545 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 72 transitions. [2021-11-25 17:53:50,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 5 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 17:53:50,546 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 72 transitions. [2021-11-25 17:53:50,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 17:53:50,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:50,547 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:50,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 17:53:50,548 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:50,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:50,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1961313006, now seen corresponding path program 3 times [2021-11-25 17:53:50,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:53:50,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676206445] [2021-11-25 17:53:50,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:50,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:53:50,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 17:53:50,575 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 17:53:50,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 17:53:50,627 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 17:53:50,628 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 17:53:50,629 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 17:53:50,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 17:53:50,634 INFO L732 BasicCegarLoop]: Path program histogram: [3, 1, 1] [2021-11-25 17:53:50,637 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 17:53:50,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 05:53:50 BoogieIcfgContainer [2021-11-25 17:53:50,669 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 17:53:50,670 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 17:53:50,670 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 17:53:50,670 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 17:53:50,671 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:53:23" (3/4) ... [2021-11-25 17:53:50,674 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-25 17:53:50,674 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 17:53:50,675 INFO L158 Benchmark]: Toolchain (without parser) took 27948.32ms. Allocated memory was 104.9MB in the beginning and 199.2MB in the end (delta: 94.4MB). Free memory was 62.9MB in the beginning and 140.9MB in the end (delta: -78.1MB). Peak memory consumption was 14.5MB. Max. memory is 16.1GB. [2021-11-25 17:53:50,675 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 104.9MB. Free memory is still 80.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:53:50,675 INFO L158 Benchmark]: CACSL2BoogieTranslator took 416.31ms. Allocated memory is still 104.9MB. Free memory was 62.7MB in the beginning and 77.7MB in the end (delta: -15.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-25 17:53:50,676 INFO L158 Benchmark]: Boogie Procedure Inliner took 54.91ms. Allocated memory is still 104.9MB. Free memory was 77.4MB in the beginning and 75.9MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:53:50,676 INFO L158 Benchmark]: Boogie Preprocessor took 61.46ms. Allocated memory is still 104.9MB. Free memory was 75.9MB in the beginning and 74.7MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:53:50,677 INFO L158 Benchmark]: RCFGBuilder took 435.19ms. Allocated memory is still 104.9MB. Free memory was 74.7MB in the beginning and 60.3MB in the end (delta: 14.4MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-25 17:53:50,677 INFO L158 Benchmark]: TraceAbstraction took 26966.88ms. Allocated memory was 104.9MB in the beginning and 199.2MB in the end (delta: 94.4MB). Free memory was 60.0MB in the beginning and 140.9MB in the end (delta: -81.0MB). Peak memory consumption was 14.4MB. Max. memory is 16.1GB. [2021-11-25 17:53:50,678 INFO L158 Benchmark]: Witness Printer took 4.04ms. Allocated memory is still 199.2MB. Free memory is still 140.9MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:53:50,680 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 104.9MB. Free memory is still 80.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 416.31ms. Allocated memory is still 104.9MB. Free memory was 62.7MB in the beginning and 77.7MB in the end (delta: -15.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 54.91ms. Allocated memory is still 104.9MB. Free memory was 77.4MB in the beginning and 75.9MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 61.46ms. Allocated memory is still 104.9MB. Free memory was 75.9MB in the beginning and 74.7MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 435.19ms. Allocated memory is still 104.9MB. Free memory was 74.7MB in the beginning and 60.3MB in the end (delta: 14.4MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 26966.88ms. Allocated memory was 104.9MB in the beginning and 199.2MB in the end (delta: 94.4MB). Free memory was 60.0MB in the beginning and 140.9MB in the end (delta: -81.0MB). Peak memory consumption was 14.4MB. Max. memory is 16.1GB. * Witness Printer took 4.04ms. Allocated memory is still 199.2MB. Free memory is still 140.9MB. There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 18]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of bitwiseOr at line 111, overapproximation of bitwiseAnd at line 109. Possible FailurePath: [L227] unsigned int a ; [L228] unsigned int ma = __VERIFIER_nondet_uint(); [L229] signed char ea = __VERIFIER_nondet_char(); [L230] unsigned int b ; [L231] unsigned int mb = __VERIFIER_nondet_uint(); [L232] signed char eb = __VERIFIER_nondet_char(); [L233] unsigned int r_add1 ; [L234] unsigned int r_add2 ; [L235] unsigned int zero ; [L236] int tmp ; [L237] int tmp___0 ; [L238] int __retres14 ; VAL [ea=0, eb=0] [L242] CALL, EXPR base2flt(0, 0) VAL [\old(e)=0, \old(m)=0] [L26] unsigned int res ; [L27] unsigned int __retres4 ; VAL [\old(e)=0, \old(m)=0, e=0, m=0] [L30] COND TRUE ! m [L31] __retres4 = 0U VAL [\old(e)=0, \old(m)=0, __retres4=0, e=0, m=0] [L81] return (__retres4); [L242] RET, EXPR base2flt(0, 0) VAL [base2flt(0, 0)=0, ea=0, eb=0] [L242] zero = base2flt(0, 0) [L243] CALL, EXPR base2flt(ma, ea) VAL [\old(e)=0, \old(m)=16777216] [L26] unsigned int res ; [L27] unsigned int __retres4 ; VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L30] COND FALSE !(! m) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L36] COND FALSE !(m < 1U << 24U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L58] COND TRUE 1 VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L60] COND FALSE !(m >= 1U << 25U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L77] m = m & ~ (1U << 24U) [L78] res = m | ((unsigned int )(e + 128) << 24U) [L79] __retres4 = res VAL [\old(e)=0, \old(m)=16777216, __retres4=16777216, e=0, res=16777216] [L81] return (__retres4); [L243] RET, EXPR base2flt(ma, ea) VAL [base2flt(ma, ea)=-72057594021150720, ea=0, eb=0, ma=16777216, zero=0] [L243] a = base2flt(ma, ea) [L244] CALL, EXPR base2flt(mb, eb) VAL [\old(e)=0, \old(m)=16777216] [L26] unsigned int res ; [L27] unsigned int __retres4 ; VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L30] COND FALSE !(! m) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L36] COND FALSE !(m < 1U << 24U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L58] COND TRUE 1 VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L60] COND FALSE !(m >= 1U << 25U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L77] m = m & ~ (1U << 24U) [L78] res = m | ((unsigned int )(e + 128) << 24U) [L79] __retres4 = res VAL [\old(e)=0, \old(m)=16777216, __retres4=1, e=0, res=1] [L81] return (__retres4); [L244] RET, EXPR base2flt(mb, eb) VAL [a=16777216, base2flt(mb, eb)=-108086395351859199, ea=0, eb=0, ma=16777216, mb=16777216, zero=0] [L244] b = base2flt(mb, eb) [L245] CALL addflt(a, b) VAL [\old(a)=16777216, \old(b)=1] [L85] unsigned int res ; [L86] unsigned int ma ; [L87] unsigned int mb ; [L88] unsigned int delta ; [L89] int ea ; [L90] int eb ; [L91] unsigned int tmp ; [L92] unsigned int __retres10 ; [L95] COND FALSE !(a < b) VAL [\old(a)=16777216, \old(b)=1, a=16777216, b=1, tmp=16777216] [L102] COND FALSE !(! b) [L109] ma = a & ((1U << 24U) - 1U) [L110] ea = (int )(a >> 24U) - 128 [L111] ma = ma | (1U << 24U) [L112] mb = b & ((1U << 24U) - 1U) [L113] eb = (int )(b >> 24U) - 128 [L114] mb = mb | (1U << 24U) VAL [\old(a)=16777216, \old(b)=1, a=16777216, b=1, ea=-127, eb=2147483264, tmp=16777216] [L115] CALL __VERIFIER_assert(ea >= eb) VAL [\old(cond)=0] [L17] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L18] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 43 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 26.8s, OverallIterations: 5, TraceHistogramMax: 3, PathProgramHistogramMax: 3, EmptinessCheckTime: 0.0s, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 101 SdHoareTripleChecker+Valid, 0.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 79 mSDsluCounter, 1549 SdHoareTripleChecker+Invalid, 0.5s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1489 mSDsCounter, 29 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 704 IncrementalHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 29 mSolverCounterUnsat, 179 mSDtfsCounter, 704 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 155 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 20.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=67occurred in iteration=2, InterpolantAutomatonStates: 52, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 4 MinimizatonAttempts, 42 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.6s InterpolantComputationTime, 185 NumberOfCodeBlocks, 185 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 175 ConstructedInterpolants, 0 QuantifiedInterpolants, 453 SizeOfPredicates, 8 NumberOfNonLiveVariables, 112 ConjunctsInSsa, 17 ConjunctsInUnsatCore, 6 InterpolantComputations, 3 PerfectInterpolantSequences, 64/76 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 could not prove your program: unable to determine feasibility of some traces [2021-11-25 17:53:50,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7 --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 2abfa4882ab8ec6bd7a33a5fbeaa8a88ba40a897019218fc162e52833c89454b --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:53:53,093 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:53:53,096 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:53:53,149 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:53:53,150 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:53:53,154 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:53:53,156 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:53:53,160 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:53:53,163 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:53:53,173 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:53:53,174 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:53:53,177 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:53:53,177 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:53:53,179 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:53:53,180 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:53:53,181 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:53:53,182 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:53:53,182 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:53:53,184 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:53:53,186 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:53:53,188 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:53:53,194 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:53:53,195 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:53:53,196 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:53:53,200 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:53:53,200 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:53:53,201 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:53:53,202 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:53:53,202 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:53:53,210 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:53:53,211 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:53:53,212 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:53:53,214 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:53:53,214 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:53:53,216 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:53:53,216 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:53:53,217 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:53:53,217 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:53:53,224 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:53:53,225 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:53:53,226 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:53:53,227 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-25 17:53:53,273 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:53:53,273 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:53:53,274 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:53:53,274 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:53:53,275 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:53:53,275 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:53:53,275 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:53:53,276 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:53:53,276 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:53:53,276 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:53:53,277 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:53:53,277 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:53:53,278 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:53:53,279 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:53:53,279 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:53:53,279 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:53:53,279 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:53:53,279 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:53:53,280 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:53:53,280 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 17:53:53,280 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 17:53:53,280 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 17:53:53,280 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:53:53,281 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:53:53,281 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:53:53,281 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:53:53,281 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:53:53,282 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 17:53:53,282 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:53:53,282 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:53:53,282 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:53:53,282 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:53:53,283 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:53:53,283 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 17:53:53,283 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 17:53:53,284 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:53:53,284 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:53:53,284 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:53:53,284 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_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2abfa4882ab8ec6bd7a33a5fbeaa8a88ba40a897019218fc162e52833c89454b [2021-11-25 17:53:53,669 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:53:53,699 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:53:53,702 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:53:53,703 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:53:53,704 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:53:53,705 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c [2021-11-25 17:53:53,776 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/c081e14cb/aac89c2d21c64261b14d04f1a723d037/FLAG7bc38f4c7 [2021-11-25 17:53:54,381 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:53:54,382 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c [2021-11-25 17:53:54,393 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/c081e14cb/aac89c2d21c64261b14d04f1a723d037/FLAG7bc38f4c7 [2021-11-25 17:53:54,741 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/data/c081e14cb/aac89c2d21c64261b14d04f1a723d037 [2021-11-25 17:53:54,744 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:53:54,746 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:53:54,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:53:54,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:53:54,752 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:53:54,753 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:53:54" (1/1) ... [2021-11-25 17:53:54,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@662e32cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:54, skipping insertion in model container [2021-11-25 17:53:54,755 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:53:54" (1/1) ... [2021-11-25 17:53:54,762 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:53:54,787 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:53:54,935 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c[755,768] [2021-11-25 17:53:54,984 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:53:54,994 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:53:55,007 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/sv-benchmarks/c/bitvector/soft_float_4-2a.c.cil.c[755,768] [2021-11-25 17:53:55,034 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:53:55,048 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:53:55,049 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55 WrapperNode [2021-11-25 17:53:55,049 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:53:55,050 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:53:55,051 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:53:55,051 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:53:55,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,068 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,086 INFO L137 Inliner]: procedures = 17, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 51 [2021-11-25 17:53:55,087 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:53:55,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:53:55,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:53:55,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:53:55,096 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,096 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,100 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,101 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,109 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,114 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,116 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,128 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:53:55,129 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:53:55,130 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:53:55,130 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:53:55,131 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (1/1) ... [2021-11-25 17:53:55,147 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:53:55,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:53:55,180 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:53:55,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:53:55,255 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:53:55,256 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 17:53:55,256 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-25 17:53:55,256 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-25 17:53:55,256 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:53:55,256 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:53:55,257 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2021-11-25 17:53:55,257 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2021-11-25 17:53:55,257 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:53:55,257 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:53:55,334 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:53:55,336 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:53:55,619 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:53:55,628 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:53:55,628 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 17:53:55,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:53:55 BoogieIcfgContainer [2021-11-25 17:53:55,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:53:55,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:53:55,632 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:53:55,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:53:55,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:53:54" (1/3) ... [2021-11-25 17:53:55,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c5fb0ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:53:55, skipping insertion in model container [2021-11-25 17:53:55,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:53:55" (2/3) ... [2021-11-25 17:53:55,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c5fb0ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:53:55, skipping insertion in model container [2021-11-25 17:53:55,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:53:55" (3/3) ... [2021-11-25 17:53:55,641 INFO L111 eAbstractionObserver]: Analyzing ICFG soft_float_4-2a.c.cil.c [2021-11-25 17:53:55,649 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:53:55,650 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:53:55,718 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:53:55,735 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:53:55,736 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:53:55,758 INFO L276 IsEmpty]: Start isEmpty. Operand has 54 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 42 states have internal predecessors, (61), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 17:53:55,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 17:53:55,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:55,767 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:55,768 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:55,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:55,779 INFO L85 PathProgramCache]: Analyzing trace with hash -2030319843, now seen corresponding path program 1 times [2021-11-25 17:53:55,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:53:55,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1702294923] [2021-11-25 17:53:55,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:55,800 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:53:55,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:53:55,805 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:53:55,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 17:53:55,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:55,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:53:55,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:56,207 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:56,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:53:56,208 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:53:56,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1702294923] [2021-11-25 17:53:56,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1702294923] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:53:56,209 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:53:56,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 17:53:56,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741984966] [2021-11-25 17:53:56,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:53:56,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:53:56,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:53:56,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:53:56,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:53:56,283 INFO L87 Difference]: Start difference. First operand has 54 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 42 states have internal predecessors, (61), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:53:56,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:56,446 INFO L93 Difference]: Finished difference Result 130 states and 195 transitions. [2021-11-25 17:53:56,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:53:56,449 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 31 [2021-11-25 17:53:56,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:56,459 INFO L225 Difference]: With dead ends: 130 [2021-11-25 17:53:56,459 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 17:53:56,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:53:56,468 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 23 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:56,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 465 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:53:56,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 17:53:56,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2021-11-25 17:53:56,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 48 states have internal predecessors, (60), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-25 17:53:56,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 80 transitions. [2021-11-25 17:53:56,559 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 80 transitions. Word has length 31 [2021-11-25 17:53:56,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:56,561 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 80 transitions. [2021-11-25 17:53:56,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:53:56,562 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 80 transitions. [2021-11-25 17:53:56,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 17:53:56,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:56,566 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:56,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:53:56,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:53:56,782 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:56,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:56,783 INFO L85 PathProgramCache]: Analyzing trace with hash -1468368814, now seen corresponding path program 1 times [2021-11-25 17:53:56,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:53:56,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [579288214] [2021-11-25 17:53:56,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:56,785 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:53:56,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:53:56,790 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:53:56,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 17:53:56,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:56,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:53:56,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:57,084 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:57,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:53:57,190 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:57,190 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:53:57,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [579288214] [2021-11-25 17:53:57,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [579288214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:53:57,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [909824642] [2021-11-25 17:53:57,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:57,192 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:53:57,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:53:57,199 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:53:57,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (4)] Waiting until timeout for monitored process [2021-11-25 17:53:57,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:57,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:53:57,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:57,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:53:57,551 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:57,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [909824642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:53:57,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303383392] [2021-11-25 17:53:57,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:57,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:53:57,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:53:57,563 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:53:57,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:53:57,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:57,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:53:57,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:57,740 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:57,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:53:57,844 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:57,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303383392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:53:57,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:53:57,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 9 [2021-11-25 17:53:57,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370385603] [2021-11-25 17:53:57,846 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:53:57,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:53:57,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:53:57,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:53:57,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:53:57,852 INFO L87 Difference]: Start difference. First operand 61 states and 80 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 17:53:57,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:57,990 INFO L93 Difference]: Finished difference Result 121 states and 159 transitions. [2021-11-25 17:53:57,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 17:53:57,990 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-11-25 17:53:57,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:57,993 INFO L225 Difference]: With dead ends: 121 [2021-11-25 17:53:57,993 INFO L226 Difference]: Without dead ends: 93 [2021-11-25 17:53:57,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-11-25 17:53:57,996 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 26 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:57,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 500 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:53:57,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-25 17:53:58,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 71. [2021-11-25 17:53:58,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 55 states have internal predecessors, (68), 11 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-25 17:53:58,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 93 transitions. [2021-11-25 17:53:58,012 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 93 transitions. Word has length 35 [2021-11-25 17:53:58,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:58,013 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 93 transitions. [2021-11-25 17:53:58,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 17:53:58,013 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 93 transitions. [2021-11-25 17:53:58,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 17:53:58,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:58,016 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:58,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:53:58,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:53:58,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 17:53:58,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:53:58,618 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:58,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:58,619 INFO L85 PathProgramCache]: Analyzing trace with hash -686479404, now seen corresponding path program 1 times [2021-11-25 17:53:58,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:53:58,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [836655919] [2021-11-25 17:53:58,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:58,621 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:53:58,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:53:58,624 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:53:58,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-25 17:53:58,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:58,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:53:58,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:58,813 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:58,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:53:58,899 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:58,899 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:53:58,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [836655919] [2021-11-25 17:53:58,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [836655919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:53:58,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [133401714] [2021-11-25 17:53:58,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:53:58,900 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:53:58,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:53:58,903 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:53:58,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-25 17:53:59,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:53:59,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:53:59,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:59,138 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:53:59,138 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:53:59,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [133401714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:53:59,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:53:59,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8] total 12 [2021-11-25 17:53:59,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159086908] [2021-11-25 17:53:59,140 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:53:59,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:53:59,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:53:59,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:53:59,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-25 17:53:59,142 INFO L87 Difference]: Start difference. First operand 71 states and 93 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 17:53:59,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:53:59,274 INFO L93 Difference]: Finished difference Result 114 states and 148 transitions. [2021-11-25 17:53:59,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 17:53:59,274 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 39 [2021-11-25 17:53:59,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:53:59,276 INFO L225 Difference]: With dead ends: 114 [2021-11-25 17:53:59,276 INFO L226 Difference]: Without dead ends: 91 [2021-11-25 17:53:59,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-25 17:53:59,279 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 19 mSDsluCounter, 454 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:53:59,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 523 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:53:59,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-25 17:53:59,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2021-11-25 17:53:59,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 59 states have (on average 1.271186440677966) internal successors, (75), 61 states have internal predecessors, (75), 12 states have call successors, (12), 6 states have call predecessors, (12), 7 states have return successors, (15), 11 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-25 17:53:59,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2021-11-25 17:53:59,303 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 39 [2021-11-25 17:53:59,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:53:59,305 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2021-11-25 17:53:59,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 17:53:59,305 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2021-11-25 17:53:59,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 17:53:59,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:53:59,314 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:53:59,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-25 17:53:59,526 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-25 17:53:59,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:53:59,716 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:53:59,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:53:59,717 INFO L85 PathProgramCache]: Analyzing trace with hash 461161469, now seen corresponding path program 2 times [2021-11-25 17:53:59,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:53:59,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [91309311] [2021-11-25 17:53:59,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:53:59,718 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:53:59,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:53:59,719 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:53:59,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 17:53:59,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-25 17:53:59,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:53:59,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:53:59,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:53:59,967 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 17:53:59,968 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:53:59,968 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:53:59,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [91309311] [2021-11-25 17:53:59,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [91309311] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:53:59,972 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:53:59,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:53:59,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549752407] [2021-11-25 17:53:59,973 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:53:59,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:53:59,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:53:59,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:53:59,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:53:59,974 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:54:00,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:00,048 INFO L93 Difference]: Finished difference Result 98 states and 123 transitions. [2021-11-25 17:54:00,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:54:00,050 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 39 [2021-11-25 17:54:00,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:00,053 INFO L225 Difference]: With dead ends: 98 [2021-11-25 17:54:00,053 INFO L226 Difference]: Without dead ends: 96 [2021-11-25 17:54:00,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:54:00,055 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 9 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:00,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 329 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 10 Unchecked, 0.0s Time] [2021-11-25 17:54:00,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-25 17:54:00,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 85. [2021-11-25 17:54:00,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.2698412698412698) internal successors, (80), 66 states have internal predecessors, (80), 13 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 17:54:00,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 109 transitions. [2021-11-25 17:54:00,084 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 109 transitions. Word has length 39 [2021-11-25 17:54:00,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:00,086 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 109 transitions. [2021-11-25 17:54:00,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:54:00,087 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 109 transitions. [2021-11-25 17:54:00,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 17:54:00,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:00,093 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:00,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:00,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:00,304 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:00,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:00,305 INFO L85 PathProgramCache]: Analyzing trace with hash 518419771, now seen corresponding path program 1 times [2021-11-25 17:54:00,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:00,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [850504583] [2021-11-25 17:54:00,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:00,306 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:00,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:00,307 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:00,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-25 17:54:00,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:00,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 17:54:00,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:00,521 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 17:54:00,521 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:00,521 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:00,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [850504583] [2021-11-25 17:54:00,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [850504583] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:00,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:54:00,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:54:00,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548197872] [2021-11-25 17:54:00,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:00,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:54:00,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:00,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:54:00,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:54:00,524 INFO L87 Difference]: Start difference. First operand 85 states and 109 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:54:00,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:00,584 INFO L93 Difference]: Finished difference Result 94 states and 118 transitions. [2021-11-25 17:54:00,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:54:00,585 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 39 [2021-11-25 17:54:00,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:00,586 INFO L225 Difference]: With dead ends: 94 [2021-11-25 17:54:00,586 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 17:54:00,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:54:00,588 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 9 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:00,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 307 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2021-11-25 17:54:00,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 17:54:00,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 83. [2021-11-25 17:54:00,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 62 states have (on average 1.2580645161290323) internal successors, (78), 64 states have internal predecessors, (78), 12 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (15), 11 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-25 17:54:00,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 105 transitions. [2021-11-25 17:54:00,601 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 105 transitions. Word has length 39 [2021-11-25 17:54:00,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:00,601 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 105 transitions. [2021-11-25 17:54:00,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:54:00,602 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 105 transitions. [2021-11-25 17:54:00,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 17:54:00,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:00,603 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1] [2021-11-25 17:54:00,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:00,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:00,814 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:00,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:00,814 INFO L85 PathProgramCache]: Analyzing trace with hash -1863687100, now seen corresponding path program 1 times [2021-11-25 17:54:00,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:00,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [311750523] [2021-11-25 17:54:00,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:00,816 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:00,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:00,826 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:00,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-25 17:54:00,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:00,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:54:00,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:01,008 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:01,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:01,173 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:01,174 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:01,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [311750523] [2021-11-25 17:54:01,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [311750523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:01,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [23482358] [2021-11-25 17:54:01,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:01,174 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:01,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:01,179 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:01,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-25 17:54:01,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:01,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:54:01,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:01,341 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:01,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:01,472 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:01,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [23482358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:01,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736676957] [2021-11-25 17:54:01,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:01,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:01,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:01,475 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:01,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 17:54:01,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:01,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:54:01,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:01,622 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:01,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:01,752 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:01,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736676957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:01,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:01,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2021-11-25 17:54:01,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023258068] [2021-11-25 17:54:01,754 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:01,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:54:01,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:01,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:54:01,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:54:01,755 INFO L87 Difference]: Start difference. First operand 83 states and 105 transitions. Second operand has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:54:01,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:01,943 INFO L93 Difference]: Finished difference Result 129 states and 168 transitions. [2021-11-25 17:54:01,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:54:01,944 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 44 [2021-11-25 17:54:01,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:01,945 INFO L225 Difference]: With dead ends: 129 [2021-11-25 17:54:01,945 INFO L226 Difference]: Without dead ends: 118 [2021-11-25 17:54:01,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:54:01,947 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 47 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:01,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 483 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:54:01,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-25 17:54:01,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 97. [2021-11-25 17:54:01,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 71 states have (on average 1.2394366197183098) internal successors, (88), 75 states have internal predecessors, (88), 15 states have call successors, (15), 7 states have call predecessors, (15), 10 states have return successors, (21), 14 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 17:54:01,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 124 transitions. [2021-11-25 17:54:01,978 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 124 transitions. Word has length 44 [2021-11-25 17:54:01,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:01,980 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 124 transitions. [2021-11-25 17:54:01,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:54:01,981 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 124 transitions. [2021-11-25 17:54:01,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 17:54:01,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:01,983 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:02,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:02,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:02,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:02,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:02,591 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:02,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:02,591 INFO L85 PathProgramCache]: Analyzing trace with hash -1162622522, now seen corresponding path program 1 times [2021-11-25 17:54:02,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:02,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1655539946] [2021-11-25 17:54:02,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:02,592 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:02,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:02,593 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:02,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-25 17:54:02,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:02,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:54:02,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:02,790 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:02,790 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:02,790 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:02,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1655539946] [2021-11-25 17:54:02,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1655539946] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:02,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:54:02,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 17:54:02,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532783030] [2021-11-25 17:54:02,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:02,792 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:54:02,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:02,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:54:02,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:54:02,793 INFO L87 Difference]: Start difference. First operand 97 states and 124 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:54:03,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:03,026 INFO L93 Difference]: Finished difference Result 133 states and 170 transitions. [2021-11-25 17:54:03,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 17:54:03,026 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 44 [2021-11-25 17:54:03,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:03,028 INFO L225 Difference]: With dead ends: 133 [2021-11-25 17:54:03,028 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 17:54:03,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-25 17:54:03,030 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 34 mSDsluCounter, 596 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:03,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 666 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:54:03,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 17:54:03,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 99. [2021-11-25 17:54:03,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.2328767123287672) internal successors, (90), 76 states have internal predecessors, (90), 15 states have call successors, (15), 7 states have call predecessors, (15), 10 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 17:54:03,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 126 transitions. [2021-11-25 17:54:03,047 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 126 transitions. Word has length 44 [2021-11-25 17:54:03,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:03,047 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 126 transitions. [2021-11-25 17:54:03,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:54:03,048 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 126 transitions. [2021-11-25 17:54:03,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 17:54:03,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:03,049 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:03,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:03,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:03,261 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:03,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:03,262 INFO L85 PathProgramCache]: Analyzing trace with hash -977013140, now seen corresponding path program 1 times [2021-11-25 17:54:03,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:03,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1686446318] [2021-11-25 17:54:03,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:03,262 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:03,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:03,264 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:03,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-25 17:54:03,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:03,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:54:03,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:03,488 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:03,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:03,725 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:03,725 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:03,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1686446318] [2021-11-25 17:54:03,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1686446318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:03,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [158991782] [2021-11-25 17:54:03,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:03,726 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:03,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:03,731 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:03,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-25 17:54:03,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:03,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 17:54:03,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:03,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:04,256 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:04,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [158991782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:04,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845791938] [2021-11-25 17:54:04,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:04,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:04,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:04,259 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:04,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 17:54:04,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:04,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:54:04,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:04,416 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:04,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:04,580 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 17:54:04,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845791938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:04,580 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:04,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10, 10, 11, 11] total 21 [2021-11-25 17:54:04,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102762857] [2021-11-25 17:54:04,580 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:04,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 17:54:04,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:04,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 17:54:04,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=372, Unknown=0, NotChecked=0, Total=420 [2021-11-25 17:54:04,582 INFO L87 Difference]: Start difference. First operand 99 states and 126 transitions. Second operand has 21 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 17:54:05,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:05,176 INFO L93 Difference]: Finished difference Result 177 states and 229 transitions. [2021-11-25 17:54:05,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 17:54:05,177 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) Word has length 46 [2021-11-25 17:54:05,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:05,178 INFO L225 Difference]: With dead ends: 177 [2021-11-25 17:54:05,178 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 17:54:05,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2021-11-25 17:54:05,180 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 101 mSDsluCounter, 915 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 980 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:05,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 980 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:54:05,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 17:54:05,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 123. [2021-11-25 17:54:05,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 92 states have (on average 1.2065217391304348) internal successors, (111), 94 states have internal predecessors, (111), 18 states have call successors, (18), 9 states have call predecessors, (18), 12 states have return successors, (29), 19 states have call predecessors, (29), 17 states have call successors, (29) [2021-11-25 17:54:05,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 158 transitions. [2021-11-25 17:54:05,197 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 158 transitions. Word has length 46 [2021-11-25 17:54:05,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:05,198 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 158 transitions. [2021-11-25 17:54:05,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 17:54:05,198 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 158 transitions. [2021-11-25 17:54:05,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 17:54:05,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:05,199 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:05,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:05,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:05,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:05,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:05,811 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:05,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:05,812 INFO L85 PathProgramCache]: Analyzing trace with hash -919754838, now seen corresponding path program 1 times [2021-11-25 17:54:05,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:05,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1208298930] [2021-11-25 17:54:05,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:05,812 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:05,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:05,813 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:05,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-25 17:54:05,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:05,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 17:54:05,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:05,974 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 17:54:05,975 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:05,975 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:05,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1208298930] [2021-11-25 17:54:05,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1208298930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:05,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:54:05,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:54:05,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131636956] [2021-11-25 17:54:05,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:05,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:54:05,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:05,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:54:05,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:54:05,978 INFO L87 Difference]: Start difference. First operand 123 states and 158 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 17:54:06,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:06,023 INFO L93 Difference]: Finished difference Result 131 states and 165 transitions. [2021-11-25 17:54:06,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:54:06,024 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 46 [2021-11-25 17:54:06,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:06,027 INFO L225 Difference]: With dead ends: 131 [2021-11-25 17:54:06,027 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 17:54:06,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:54:06,031 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 6 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:06,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 312 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:54:06,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 17:54:06,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-11-25 17:54:06,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 85 states have internal predecessors, (98), 16 states have call successors, (16), 8 states have call predecessors, (16), 11 states have return successors, (25), 16 states have call predecessors, (25), 15 states have call successors, (25) [2021-11-25 17:54:06,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 139 transitions. [2021-11-25 17:54:06,050 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 139 transitions. Word has length 46 [2021-11-25 17:54:06,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:06,050 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 139 transitions. [2021-11-25 17:54:06,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 17:54:06,051 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 139 transitions. [2021-11-25 17:54:06,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 17:54:06,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:06,053 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:06,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:06,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:06,264 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:06,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:06,264 INFO L85 PathProgramCache]: Analyzing trace with hash -168643793, now seen corresponding path program 1 times [2021-11-25 17:54:06,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:06,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1387419264] [2021-11-25 17:54:06,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:06,265 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:06,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:06,266 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:06,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-25 17:54:06,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:06,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:54:06,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:06,541 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:06,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:07,042 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:07,043 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:07,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1387419264] [2021-11-25 17:54:07,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1387419264] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:07,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1811114768] [2021-11-25 17:54:07,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:07,043 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:07,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:07,047 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:07,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-25 17:54:07,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:07,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:54:07,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:07,213 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:07,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:07,373 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:07,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1811114768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:07,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614797259] [2021-11-25 17:54:07,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:07,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:07,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:07,375 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:07,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 17:54:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:07,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:54:07,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:07,537 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:07,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:07,711 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:07,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614797259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:07,711 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:07,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-25 17:54:07,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645792125] [2021-11-25 17:54:07,712 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:07,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 17:54:07,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:07,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 17:54:07,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-25 17:54:07,713 INFO L87 Difference]: Start difference. First operand 110 states and 139 transitions. Second operand has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 17:54:08,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:08,857 INFO L93 Difference]: Finished difference Result 156 states and 213 transitions. [2021-11-25 17:54:08,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 17:54:08,857 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 48 [2021-11-25 17:54:08,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:08,859 INFO L225 Difference]: With dead ends: 156 [2021-11-25 17:54:08,859 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 17:54:08,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=199, Invalid=1361, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 17:54:08,861 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 118 mSDsluCounter, 1128 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 1199 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:08,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 1199 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 17:54:08,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 17:54:08,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 99. [2021-11-25 17:54:08,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.2054794520547945) internal successors, (88), 78 states have internal predecessors, (88), 14 states have call successors, (14), 6 states have call predecessors, (14), 11 states have return successors, (32), 14 states have call predecessors, (32), 13 states have call successors, (32) [2021-11-25 17:54:08,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 134 transitions. [2021-11-25 17:54:08,876 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 134 transitions. Word has length 48 [2021-11-25 17:54:08,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:08,876 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 134 transitions. [2021-11-25 17:54:08,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 17:54:08,877 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 134 transitions. [2021-11-25 17:54:08,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 17:54:08,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:08,878 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:08,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:09,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:09,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-25 17:54:09,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:09,498 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:09,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:09,498 INFO L85 PathProgramCache]: Analyzing trace with hash 291178745, now seen corresponding path program 2 times [2021-11-25 17:54:09,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:09,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [531946180] [2021-11-25 17:54:09,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:09,499 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:09,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:09,500 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:09,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-25 17:54:09,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:09,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:09,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:54:09,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:09,776 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:09,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:10,207 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:10,208 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:10,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [531946180] [2021-11-25 17:54:10,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [531946180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:10,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [679343590] [2021-11-25 17:54:10,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:10,209 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:10,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:10,210 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:10,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-25 17:54:10,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:10,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:10,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:54:10,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:10,380 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:10,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:10,546 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:10,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [679343590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:10,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026872990] [2021-11-25 17:54:10,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:10,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:10,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:10,547 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:10,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 17:54:10,601 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:10,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:10,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:54:10,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:10,706 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:10,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:10,872 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 17:54:10,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026872990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:10,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:10,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-25 17:54:10,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153645188] [2021-11-25 17:54:10,873 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:10,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 17:54:10,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:10,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 17:54:10,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-25 17:54:10,875 INFO L87 Difference]: Start difference. First operand 99 states and 134 transitions. Second operand has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 17:54:11,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:11,977 INFO L93 Difference]: Finished difference Result 137 states and 186 transitions. [2021-11-25 17:54:11,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 17:54:11,978 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 48 [2021-11-25 17:54:11,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:11,979 INFO L225 Difference]: With dead ends: 137 [2021-11-25 17:54:11,979 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 17:54:11,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=184, Invalid=1298, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 17:54:11,981 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 122 mSDsluCounter, 1095 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 1166 SdHoareTripleChecker+Invalid, 540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:11,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 1166 Invalid, 540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 17:54:11,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 17:54:11,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 83. [2021-11-25 17:54:11,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 61 states have (on average 1.2459016393442623) internal successors, (76), 66 states have internal predecessors, (76), 12 states have call successors, (12), 4 states have call predecessors, (12), 9 states have return successors, (28), 12 states have call predecessors, (28), 11 states have call successors, (28) [2021-11-25 17:54:11,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 116 transitions. [2021-11-25 17:54:11,992 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 116 transitions. Word has length 48 [2021-11-25 17:54:11,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:11,992 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 116 transitions. [2021-11-25 17:54:11,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 17:54:11,993 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 116 transitions. [2021-11-25 17:54:11,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 17:54:11,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:11,994 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:12,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:12,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:12,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:12,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:12,608 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:12,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:12,608 INFO L85 PathProgramCache]: Analyzing trace with hash -744862915, now seen corresponding path program 1 times [2021-11-25 17:54:12,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:12,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [889463255] [2021-11-25 17:54:12,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:12,609 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:12,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:12,610 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:12,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-25 17:54:12,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:12,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:12,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:14,971 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 17:54:14,971 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:14,971 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:14,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [889463255] [2021-11-25 17:54:14,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [889463255] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:14,972 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:54:14,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 17:54:14,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742630809] [2021-11-25 17:54:14,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:14,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:54:14,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:14,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:54:14,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=36, Unknown=1, NotChecked=0, Total=56 [2021-11-25 17:54:14,973 INFO L87 Difference]: Start difference. First operand 83 states and 116 transitions. Second operand has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 17:54:15,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:15,002 INFO L93 Difference]: Finished difference Result 90 states and 123 transitions. [2021-11-25 17:54:15,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:54:15,003 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 49 [2021-11-25 17:54:15,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:15,004 INFO L225 Difference]: With dead ends: 90 [2021-11-25 17:54:15,004 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 17:54:15,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=23, Invalid=48, Unknown=1, NotChecked=0, Total=72 [2021-11-25 17:54:15,005 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 7 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:15,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 287 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 21 Unchecked, 0.0s Time] [2021-11-25 17:54:15,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 17:54:15,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-25 17:54:15,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 64 states have (on average 1.234375) internal successors, (79), 70 states have internal predecessors, (79), 13 states have call successors, (13), 5 states have call predecessors, (13), 10 states have return successors, (29), 12 states have call predecessors, (29), 12 states have call successors, (29) [2021-11-25 17:54:15,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 121 transitions. [2021-11-25 17:54:15,017 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 121 transitions. Word has length 49 [2021-11-25 17:54:15,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:15,017 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 121 transitions. [2021-11-25 17:54:15,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 17:54:15,018 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 121 transitions. [2021-11-25 17:54:15,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 17:54:15,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:15,019 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:15,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:15,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:15,230 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:15,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:15,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1846975685, now seen corresponding path program 1 times [2021-11-25 17:54:15,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:15,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1390492168] [2021-11-25 17:54:15,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:15,231 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:15,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:15,232 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:15,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-25 17:54:15,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:15,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:15,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:20,282 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 17:54:20,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:20,282 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:20,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1390492168] [2021-11-25 17:54:20,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1390492168] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:20,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:54:20,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 17:54:20,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349599943] [2021-11-25 17:54:20,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:20,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:54:20,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:20,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:54:20,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=38, Unknown=2, NotChecked=0, Total=56 [2021-11-25 17:54:20,284 INFO L87 Difference]: Start difference. First operand 88 states and 121 transitions. Second operand has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 17:54:20,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:20,318 INFO L93 Difference]: Finished difference Result 94 states and 126 transitions. [2021-11-25 17:54:20,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:54:20,318 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 50 [2021-11-25 17:54:20,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:20,319 INFO L225 Difference]: With dead ends: 94 [2021-11-25 17:54:20,320 INFO L226 Difference]: Without dead ends: 90 [2021-11-25 17:54:20,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2021-11-25 17:54:20,321 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 12 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:20,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 368 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-25 17:54:20,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-25 17:54:20,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 85. [2021-11-25 17:54:20,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.2222222222222223) internal successors, (77), 67 states have internal predecessors, (77), 12 states have call successors, (12), 5 states have call predecessors, (12), 9 states have return successors, (28), 12 states have call predecessors, (28), 11 states have call successors, (28) [2021-11-25 17:54:20,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2021-11-25 17:54:20,341 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 50 [2021-11-25 17:54:20,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:20,342 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2021-11-25 17:54:20,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 17:54:20,342 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2021-11-25 17:54:20,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 17:54:20,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:20,344 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:20,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:20,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:20,554 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:20,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:20,555 INFO L85 PathProgramCache]: Analyzing trace with hash -1592416888, now seen corresponding path program 1 times [2021-11-25 17:54:20,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:20,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [736630812] [2021-11-25 17:54:20,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:20,556 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:20,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:20,557 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:20,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-25 17:54:20,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:20,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:20,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:20,771 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:20,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:21,000 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:21,000 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:21,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [736630812] [2021-11-25 17:54:21,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [736630812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:21,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [542009580] [2021-11-25 17:54:21,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:21,001 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:21,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:21,006 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:21,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-25 17:54:21,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:21,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 17:54:21,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:21,266 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:54:21,267 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:21,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [542009580] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:21,267 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:54:21,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8, 8] total 14 [2021-11-25 17:54:21,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218173534] [2021-11-25 17:54:21,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:21,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:54:21,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:21,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:54:21,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:54:21,269 INFO L87 Difference]: Start difference. First operand 85 states and 117 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:54:21,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:21,378 INFO L93 Difference]: Finished difference Result 117 states and 175 transitions. [2021-11-25 17:54:21,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:54:21,379 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 54 [2021-11-25 17:54:21,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:21,380 INFO L225 Difference]: With dead ends: 117 [2021-11-25 17:54:21,381 INFO L226 Difference]: Without dead ends: 106 [2021-11-25 17:54:21,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:54:21,382 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 31 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:21,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 282 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:54:21,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-25 17:54:21,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 99. [2021-11-25 17:54:21,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 72 states have (on average 1.2222222222222223) internal successors, (88), 78 states have internal predecessors, (88), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (44), 15 states have call predecessors, (44), 14 states have call successors, (44) [2021-11-25 17:54:21,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 147 transitions. [2021-11-25 17:54:21,398 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 147 transitions. Word has length 54 [2021-11-25 17:54:21,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:21,399 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 147 transitions. [2021-11-25 17:54:21,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:54:21,400 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 147 transitions. [2021-11-25 17:54:21,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:54:21,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:21,401 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:21,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:21,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-11-25 17:54:21,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:21,803 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:21,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:21,804 INFO L85 PathProgramCache]: Analyzing trace with hash 18588658, now seen corresponding path program 1 times [2021-11-25 17:54:21,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:21,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1609195685] [2021-11-25 17:54:21,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:21,805 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:21,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:21,806 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:21,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-25 17:54:21,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:21,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:21,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:22,026 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:22,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:22,244 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:22,245 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:22,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1609195685] [2021-11-25 17:54:22,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1609195685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:22,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [401141295] [2021-11-25 17:54:22,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:22,246 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:22,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:22,250 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:22,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-25 17:54:22,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:22,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:22,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:22,445 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:22,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:22,669 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:22,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [401141295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:22,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718560801] [2021-11-25 17:54:22,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:22,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:22,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:22,670 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:22,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 17:54:22,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:22,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:22,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:22,836 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:22,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:23,049 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:23,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718560801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:23,049 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:23,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 17:54:23,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476352763] [2021-11-25 17:54:23,050 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:23,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:54:23,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:23,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:54:23,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:54:23,051 INFO L87 Difference]: Start difference. First operand 99 states and 147 transitions. Second operand has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:23,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:23,293 INFO L93 Difference]: Finished difference Result 113 states and 165 transitions. [2021-11-25 17:54:23,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:54:23,294 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 63 [2021-11-25 17:54:23,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:23,295 INFO L225 Difference]: With dead ends: 113 [2021-11-25 17:54:23,295 INFO L226 Difference]: Without dead ends: 102 [2021-11-25 17:54:23,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-25 17:54:23,297 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 127 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:23,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 438 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:54:23,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-25 17:54:23,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2021-11-25 17:54:23,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 81 states have internal predecessors, (90), 15 states have call successors, (15), 5 states have call predecessors, (15), 12 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2021-11-25 17:54:23,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 151 transitions. [2021-11-25 17:54:23,310 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 151 transitions. Word has length 63 [2021-11-25 17:54:23,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:23,310 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 151 transitions. [2021-11-25 17:54:23,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:23,311 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 151 transitions. [2021-11-25 17:54:23,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:54:23,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:23,312 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:23,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:23,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:23,724 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-25 17:54:23,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:23,924 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:23,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:23,924 INFO L85 PathProgramCache]: Analyzing trace with hash -177633806, now seen corresponding path program 2 times [2021-11-25 17:54:23,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:23,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [855691353] [2021-11-25 17:54:23,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:23,925 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:23,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:23,926 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:23,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-25 17:54:23,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:23,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:23,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:23,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:24,117 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:24,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:24,332 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:24,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [855691353] [2021-11-25 17:54:24,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [855691353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:24,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1878819539] [2021-11-25 17:54:24,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:24,332 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:24,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:24,333 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:24,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-25 17:54:24,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:24,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:24,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:54:24,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:24,534 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:24,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:24,702 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:24,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1878819539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:24,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634103295] [2021-11-25 17:54:24,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:24,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:24,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:24,703 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:24,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 17:54:24,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:24,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:24,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:24,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:24,856 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:24,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:25,054 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:25,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634103295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:25,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:25,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 17:54:25,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800923729] [2021-11-25 17:54:25,054 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:25,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:54:25,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:25,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:54:25,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:54:25,056 INFO L87 Difference]: Start difference. First operand 102 states and 151 transitions. Second operand has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:25,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:25,290 INFO L93 Difference]: Finished difference Result 115 states and 169 transitions. [2021-11-25 17:54:25,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:54:25,291 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 63 [2021-11-25 17:54:25,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:25,293 INFO L225 Difference]: With dead ends: 115 [2021-11-25 17:54:25,293 INFO L226 Difference]: Without dead ends: 102 [2021-11-25 17:54:25,294 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-25 17:54:25,294 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 112 mSDsluCounter, 418 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:25,295 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 497 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:54:25,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-25 17:54:25,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2021-11-25 17:54:25,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 81 states have internal predecessors, (90), 15 states have call successors, (15), 5 states have call predecessors, (15), 12 states have return successors, (45), 15 states have call predecessors, (45), 14 states have call successors, (45) [2021-11-25 17:54:25,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 150 transitions. [2021-11-25 17:54:25,306 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 150 transitions. Word has length 63 [2021-11-25 17:54:25,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:25,307 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 150 transitions. [2021-11-25 17:54:25,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:25,307 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 150 transitions. [2021-11-25 17:54:25,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:54:25,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:25,309 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:25,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:25,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:25,742 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-25 17:54:25,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:25,935 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:25,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:25,935 INFO L85 PathProgramCache]: Analyzing trace with hash -2130957302, now seen corresponding path program 1 times [2021-11-25 17:54:25,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:25,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [283387427] [2021-11-25 17:54:25,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:25,936 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:25,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:25,937 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:25,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-25 17:54:25,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:25,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:25,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:26,130 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:26,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:26,341 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:26,342 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:26,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [283387427] [2021-11-25 17:54:26,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [283387427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:26,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1781240261] [2021-11-25 17:54:26,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:26,342 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:26,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:26,343 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:26,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-25 17:54:26,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:26,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:26,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:26,532 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:26,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:26,730 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:26,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1781240261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:26,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91331167] [2021-11-25 17:54:26,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:26,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:26,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:26,733 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:26,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 17:54:26,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:26,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:26,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:26,879 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:26,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:27,068 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:27,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91331167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:27,068 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:27,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 17:54:27,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788120878] [2021-11-25 17:54:27,068 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:27,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:54:27,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:27,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:54:27,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:54:27,070 INFO L87 Difference]: Start difference. First operand 102 states and 150 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:27,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:27,274 INFO L93 Difference]: Finished difference Result 113 states and 161 transitions. [2021-11-25 17:54:27,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:54:27,274 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 65 [2021-11-25 17:54:27,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:27,275 INFO L225 Difference]: With dead ends: 113 [2021-11-25 17:54:27,275 INFO L226 Difference]: Without dead ends: 99 [2021-11-25 17:54:27,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-25 17:54:27,276 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 122 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:27,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 399 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:54:27,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-25 17:54:27,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-25 17:54:27,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 78 states have internal predecessors, (87), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (41), 15 states have call predecessors, (41), 14 states have call successors, (41) [2021-11-25 17:54:27,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 143 transitions. [2021-11-25 17:54:27,285 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 143 transitions. Word has length 65 [2021-11-25 17:54:27,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:27,285 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 143 transitions. [2021-11-25 17:54:27,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:27,286 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 143 transitions. [2021-11-25 17:54:27,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:54:27,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:27,288 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:27,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:27,497 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-25 17:54:27,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:27,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:27,890 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:27,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:27,890 INFO L85 PathProgramCache]: Analyzing trace with hash -1269391674, now seen corresponding path program 2 times [2021-11-25 17:54:27,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:27,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1319349720] [2021-11-25 17:54:27,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:27,891 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:27,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:27,892 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:27,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-25 17:54:27,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:27,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:27,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:27,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:28,092 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:28,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:28,299 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:28,299 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:28,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1319349720] [2021-11-25 17:54:28,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1319349720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:28,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [863186295] [2021-11-25 17:54:28,299 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:28,299 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:28,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:28,300 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:28,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-25 17:54:28,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:28,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:28,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:28,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:28,474 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:28,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:28,670 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:28,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [863186295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:28,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902801344] [2021-11-25 17:54:28,671 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:28,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:28,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:28,672 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:28,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 17:54:28,727 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:28,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:28,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:54:28,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:28,836 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:28,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:28,997 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 17:54:28,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902801344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:28,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:28,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 17:54:28,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51106323] [2021-11-25 17:54:28,998 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:28,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:54:28,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:28,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:54:28,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:54:29,000 INFO L87 Difference]: Start difference. First operand 99 states and 143 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:29,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:29,178 INFO L93 Difference]: Finished difference Result 110 states and 154 transitions. [2021-11-25 17:54:29,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:54:29,180 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 65 [2021-11-25 17:54:29,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:29,181 INFO L225 Difference]: With dead ends: 110 [2021-11-25 17:54:29,182 INFO L226 Difference]: Without dead ends: 96 [2021-11-25 17:54:29,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-25 17:54:29,183 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 101 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:29,183 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 510 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:54:29,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-25 17:54:29,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-25 17:54:29,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 70 states have (on average 1.2) internal successors, (84), 75 states have internal predecessors, (84), 15 states have call successors, (15), 5 states have call predecessors, (15), 10 states have return successors, (39), 15 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-25 17:54:29,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 138 transitions. [2021-11-25 17:54:29,193 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 138 transitions. Word has length 65 [2021-11-25 17:54:29,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:29,193 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 138 transitions. [2021-11-25 17:54:29,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:54:29,193 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 138 transitions. [2021-11-25 17:54:29,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 17:54:29,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:29,195 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:29,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:29,415 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-25 17:54:29,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:29,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:54:29,815 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:29,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:29,815 INFO L85 PathProgramCache]: Analyzing trace with hash 1279345645, now seen corresponding path program 1 times [2021-11-25 17:54:29,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:29,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1914170225] [2021-11-25 17:54:29,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:29,816 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:29,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:29,817 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:29,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-25 17:54:29,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:29,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 17:54:29,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:30,464 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:54:30,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:32,149 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:54:32,149 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:32,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1914170225] [2021-11-25 17:54:32,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1914170225] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:32,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [587856348] [2021-11-25 17:54:32,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:32,150 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:32,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:32,150 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:32,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-25 17:54:32,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:32,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 17:54:32,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:33,612 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:54:33,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:36,443 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:54:36,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [587856348] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:36,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093206963] [2021-11-25 17:54:36,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:36,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:36,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:36,444 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:36,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 17:54:36,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:54:36,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 17:54:36,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:38,322 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:54:38,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:43,083 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:54:43,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093206963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:43,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:54:43,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16, 16, 17, 17] total 65 [2021-11-25 17:54:43,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262930808] [2021-11-25 17:54:43,083 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:43,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 17:54:43,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:54:43,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 17:54:43,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=3713, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 17:54:43,087 INFO L87 Difference]: Start difference. First operand 96 states and 138 transitions. Second operand has 65 states, 65 states have (on average 1.8) internal successors, (117), 65 states have internal predecessors, (117), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 17:54:55,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:55,004 INFO L93 Difference]: Finished difference Result 169 states and 235 transitions. [2021-11-25 17:54:55,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 17:54:55,006 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.8) internal successors, (117), 65 states have internal predecessors, (117), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) Word has length 72 [2021-11-25 17:54:55,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:55,006 INFO L225 Difference]: With dead ends: 169 [2021-11-25 17:54:55,007 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 17:54:55,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 361 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2362 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=1543, Invalid=7577, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 17:54:55,010 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 336 mSDsluCounter, 1590 mSDsCounter, 0 mSdLazyCounter, 1348 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 1669 SdHoareTripleChecker+Invalid, 1602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 1348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:55,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [344 Valid, 1669 Invalid, 1602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 1348 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-25 17:54:55,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 17:54:55,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 101. [2021-11-25 17:54:55,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 79 states have internal predecessors, (87), 16 states have call successors, (16), 5 states have call predecessors, (16), 11 states have return successors, (43), 16 states have call predecessors, (43), 15 states have call successors, (43) [2021-11-25 17:54:55,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 146 transitions. [2021-11-25 17:54:55,021 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 146 transitions. Word has length 72 [2021-11-25 17:54:55,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:55,022 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 146 transitions. [2021-11-25 17:54:55,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.8) internal successors, (117), 65 states have internal predecessors, (117), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 17:54:55,022 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 146 transitions. [2021-11-25 17:54:55,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 17:54:55,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:55,024 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:55,050 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-25 17:54:55,254 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-25 17:54:55,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-25 17:54:55,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:55,636 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:55,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:55,636 INFO L85 PathProgramCache]: Analyzing trace with hash -784876239, now seen corresponding path program 2 times [2021-11-25 17:54:55,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:54:55,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [547772164] [2021-11-25 17:54:55,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:55,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:54:55,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:54:55,637 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:54:55,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-25 17:54:55,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:55,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:55,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 17:54:55,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:56,422 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:54:56,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:57,906 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:54:57,906 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:54:57,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [547772164] [2021-11-25 17:54:57,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [547772164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:57,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [916315446] [2021-11-25 17:54:57,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:54:57,907 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:54:57,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:54:57,909 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:54:57,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-25 17:54:58,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:54:58,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:58,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 17:54:58,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:59,111 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:54:59,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:01,978 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:01,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [916315446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:01,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21083225] [2021-11-25 17:55:01,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:55:01,978 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:01,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:01,979 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:01,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 17:55:02,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:55:02,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:02,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 17:55:02,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:02,374 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:02,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:03,572 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:03,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21083225] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:03,573 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:55:03,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-25 17:55:03,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563211531] [2021-11-25 17:55:03,573 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:03,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 17:55:03,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:55:03,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 17:55:03,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1597, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 17:55:03,575 INFO L87 Difference]: Start difference. First operand 101 states and 146 transitions. Second operand has 43 states, 43 states have (on average 2.0697674418604652) internal successors, (89), 43 states have internal predecessors, (89), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 17:55:10,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:10,714 INFO L93 Difference]: Finished difference Result 177 states and 239 transitions. [2021-11-25 17:55:10,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 17:55:10,716 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0697674418604652) internal successors, (89), 43 states have internal predecessors, (89), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 72 [2021-11-25 17:55:10,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:10,717 INFO L225 Difference]: With dead ends: 177 [2021-11-25 17:55:10,717 INFO L226 Difference]: Without dead ends: 116 [2021-11-25 17:55:10,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 381 SyntacticMatches, 4 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=791, Invalid=3631, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 17:55:10,720 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 337 mSDsluCounter, 1259 mSDsCounter, 0 mSdLazyCounter, 893 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 1338 SdHoareTripleChecker+Invalid, 1016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 893 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:10,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 1338 Invalid, 1016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 893 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 17:55:10,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-25 17:55:10,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-11-25 17:55:10,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 78 states have internal predecessors, (86), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (39), 15 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-25 17:55:10,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 140 transitions. [2021-11-25 17:55:10,734 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 140 transitions. Word has length 72 [2021-11-25 17:55:10,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:10,735 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 140 transitions. [2021-11-25 17:55:10,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0697674418604652) internal successors, (89), 43 states have internal predecessors, (89), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 17:55:10,735 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 140 transitions. [2021-11-25 17:55:10,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 17:55:10,737 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:10,737 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:10,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:10,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:11,140 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-11-25 17:55:11,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:55:11,339 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:11,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:11,339 INFO L85 PathProgramCache]: Analyzing trace with hash 1250321149, now seen corresponding path program 1 times [2021-11-25 17:55:11,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:55:11,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [911940910] [2021-11-25 17:55:11,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:11,340 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:55:11,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:55:11,341 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:55:11,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-25 17:55:11,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:11,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 17:55:11,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:11,996 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:11,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:13,395 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:13,396 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:55:13,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [911940910] [2021-11-25 17:55:13,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [911940910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:13,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1400941339] [2021-11-25 17:55:13,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:13,397 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:55:13,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:55:13,397 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:55:13,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-25 17:55:13,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:13,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 17:55:13,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:14,590 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:14,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:17,634 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:17,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1400941339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:17,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606915628] [2021-11-25 17:55:17,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:17,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:17,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:17,635 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:17,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 17:55:17,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:17,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 17:55:17,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:18,002 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:18,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:19,050 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:19,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606915628] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:19,050 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:55:19,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-25 17:55:19,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134515416] [2021-11-25 17:55:19,050 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:19,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 17:55:19,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:55:19,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 17:55:19,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1560, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 17:55:19,052 INFO L87 Difference]: Start difference. First operand 99 states and 140 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 17:55:25,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:25,438 INFO L93 Difference]: Finished difference Result 136 states and 185 transitions. [2021-11-25 17:55:25,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 17:55:25,451 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 74 [2021-11-25 17:55:25,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:25,453 INFO L225 Difference]: With dead ends: 136 [2021-11-25 17:55:25,453 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 17:55:25,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 396 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=650, Invalid=3010, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 17:55:25,455 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 293 mSDsluCounter, 1104 mSDsCounter, 0 mSdLazyCounter, 591 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 1178 SdHoareTripleChecker+Invalid, 714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 591 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:25,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 1178 Invalid, 714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 591 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 17:55:25,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 17:55:25,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 93. [2021-11-25 17:55:25,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 72 states have internal predecessors, (82), 14 states have call successors, (14), 6 states have call predecessors, (14), 9 states have return successors, (27), 14 states have call predecessors, (27), 13 states have call successors, (27) [2021-11-25 17:55:25,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 123 transitions. [2021-11-25 17:55:25,466 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 123 transitions. Word has length 74 [2021-11-25 17:55:25,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:25,467 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 123 transitions. [2021-11-25 17:55:25,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 17:55:25,467 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 123 transitions. [2021-11-25 17:55:25,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 17:55:25,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:25,469 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:25,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:25,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Ended with exit code 0 [2021-11-25 17:55:25,889 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2021-11-25 17:55:26,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:55:26,089 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:26,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:26,089 INFO L85 PathProgramCache]: Analyzing trace with hash 359389810, now seen corresponding path program 1 times [2021-11-25 17:55:26,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:55:26,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1645668510] [2021-11-25 17:55:26,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:26,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:55:26,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:55:26,090 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:55:26,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-25 17:55:26,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:26,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:55:26,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:26,306 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 17:55:26,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:55:26,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:55:26,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1645668510] [2021-11-25 17:55:26,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1645668510] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:26,306 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:26,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 17:55:26,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885718880] [2021-11-25 17:55:26,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:26,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:55:26,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:55:26,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:55:26,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:55:26,308 INFO L87 Difference]: Start difference. First operand 93 states and 123 transitions. Second operand has 8 states, 7 states have (on average 5.0) internal successors, (35), 6 states have internal predecessors, (35), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:55:26,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:26,394 INFO L93 Difference]: Finished difference Result 112 states and 149 transitions. [2021-11-25 17:55:26,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:55:26,395 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.0) internal successors, (35), 6 states have internal predecessors, (35), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 74 [2021-11-25 17:55:26,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:26,397 INFO L225 Difference]: With dead ends: 112 [2021-11-25 17:55:26,397 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 17:55:26,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:55:26,398 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 7 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:26,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 401 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:26,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 17:55:26,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 98. [2021-11-25 17:55:26,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 72 states have (on average 1.1805555555555556) internal successors, (85), 76 states have internal predecessors, (85), 15 states have call successors, (15), 6 states have call predecessors, (15), 10 states have return successors, (31), 15 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-25 17:55:26,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 131 transitions. [2021-11-25 17:55:26,410 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 131 transitions. Word has length 74 [2021-11-25 17:55:26,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:26,411 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 131 transitions. [2021-11-25 17:55:26,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.0) internal successors, (35), 6 states have internal predecessors, (35), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:55:26,411 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 131 transitions. [2021-11-25 17:55:26,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 17:55:26,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:26,414 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:26,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:26,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:55:26,625 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:26,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:26,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1455113153, now seen corresponding path program 2 times [2021-11-25 17:55:26,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:55:26,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1319049550] [2021-11-25 17:55:26,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:55:26,627 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:55:26,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:55:26,628 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:55:26,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-25 17:55:26,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:55:26,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:26,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 17:55:26,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:27,263 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:27,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:28,705 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:28,705 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:55:28,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1319049550] [2021-11-25 17:55:28,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1319049550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:28,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [695155507] [2021-11-25 17:55:28,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:55:28,706 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:55:28,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:55:28,708 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:55:28,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-25 17:55:28,827 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:55:28,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:28,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 17:55:28,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:30,032 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:30,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:33,049 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:33,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [695155507] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:33,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560623817] [2021-11-25 17:55:33,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:55:33,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:33,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:33,057 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:33,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 17:55:33,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:55:33,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:33,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 17:55:33,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:33,438 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:55:33,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:34,458 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:55:34,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560623817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:34,458 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:55:34,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-25 17:55:34,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001062948] [2021-11-25 17:55:34,459 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:34,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 17:55:34,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:55:34,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 17:55:34,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1569, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 17:55:34,461 INFO L87 Difference]: Start difference. First operand 98 states and 131 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 17:55:40,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:40,818 INFO L93 Difference]: Finished difference Result 127 states and 163 transitions. [2021-11-25 17:55:40,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 17:55:40,819 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 74 [2021-11-25 17:55:40,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:40,820 INFO L225 Difference]: With dead ends: 127 [2021-11-25 17:55:40,820 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 17:55:40,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 396 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=633, Invalid=3027, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 17:55:40,822 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 298 mSDsluCounter, 1212 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 1281 SdHoareTripleChecker+Invalid, 755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:40,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 1281 Invalid, 755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 17:55:40,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 17:55:40,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 95. [2021-11-25 17:55:40,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.1714285714285715) internal successors, (82), 73 states have internal predecessors, (82), 15 states have call successors, (15), 6 states have call predecessors, (15), 9 states have return successors, (28), 15 states have call predecessors, (28), 14 states have call successors, (28) [2021-11-25 17:55:40,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 125 transitions. [2021-11-25 17:55:40,834 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 125 transitions. Word has length 74 [2021-11-25 17:55:40,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:40,834 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 125 transitions. [2021-11-25 17:55:40,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 17:55:40,835 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 125 transitions. [2021-11-25 17:55:40,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 17:55:40,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:40,836 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:40,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:41,049 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-25 17:55:41,266 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-25 17:55:41,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:41,448 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:41,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:41,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1678929915, now seen corresponding path program 1 times [2021-11-25 17:55:41,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:55:41,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [57779429] [2021-11-25 17:55:41,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:41,449 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:55:41,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:55:41,450 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:55:41,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-25 17:55:41,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:41,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:55:41,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:42,341 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:55:42,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:44,773 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:55:44,773 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:55:44,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [57779429] [2021-11-25 17:55:44,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [57779429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:44,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [434401484] [2021-11-25 17:55:44,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:44,774 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:55:44,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:55:44,775 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:55:44,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-25 17:55:44,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:44,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 17:55:44,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:47,102 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:55:47,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:55:52,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [434401484] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:55:52,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545416541] [2021-11-25 17:55:52,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:52,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:52,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:52,260 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:52,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 17:55:52,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:52,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 17:55:52,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:55,720 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:55:55,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:08,562 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:56:08,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545416541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:08,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:56:08,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 22, 24] total 85 [2021-11-25 17:56:08,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32250745] [2021-11-25 17:56:08,563 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:08,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-25 17:56:08,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:56:08,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-25 17:56:08,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=828, Invalid=6312, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 17:56:08,588 INFO L87 Difference]: Start difference. First operand 95 states and 125 transitions. Second operand has 85 states, 83 states have (on average 1.6385542168674698) internal successors, (136), 82 states have internal predecessors, (136), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 17:56:30,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:30,606 INFO L93 Difference]: Finished difference Result 142 states and 184 transitions. [2021-11-25 17:56:30,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 17:56:30,607 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 83 states have (on average 1.6385542168674698) internal successors, (136), 82 states have internal predecessors, (136), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 81 [2021-11-25 17:56:30,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:30,608 INFO L225 Difference]: With dead ends: 142 [2021-11-25 17:56:30,608 INFO L226 Difference]: Without dead ends: 128 [2021-11-25 17:56:30,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3630 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=1697, Invalid=11643, Unknown=0, NotChecked=0, Total=13340 [2021-11-25 17:56:30,613 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 302 mSDsluCounter, 2007 mSDsCounter, 0 mSdLazyCounter, 2044 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 2069 SdHoareTripleChecker+Invalid, 2281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 2044 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:30,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [312 Valid, 2069 Invalid, 2281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 2044 Invalid, 0 Unknown, 0 Unchecked, 8.2s Time] [2021-11-25 17:56:30,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-25 17:56:30,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 104. [2021-11-25 17:56:30,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 79 states have internal predecessors, (88), 17 states have call successors, (17), 6 states have call predecessors, (17), 10 states have return successors, (32), 18 states have call predecessors, (32), 16 states have call successors, (32) [2021-11-25 17:56:30,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 137 transitions. [2021-11-25 17:56:30,627 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 137 transitions. Word has length 81 [2021-11-25 17:56:30,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:30,628 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 137 transitions. [2021-11-25 17:56:30,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 83 states have (on average 1.6385542168674698) internal successors, (136), 82 states have internal predecessors, (136), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 17:56:30,628 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 137 transitions. [2021-11-25 17:56:30,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 17:56:30,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:30,630 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:30,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:30,860 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-25 17:56:31,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-25 17:56:31,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:56:31,241 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:56:31,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:31,242 INFO L85 PathProgramCache]: Analyzing trace with hash -2063078729, now seen corresponding path program 2 times [2021-11-25 17:56:31,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:56:31,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1754330790] [2021-11-25 17:56:31,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:56:31,242 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:56:31,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:56:31,243 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:56:31,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-25 17:56:31,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:56:31,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:31,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:56:31,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:32,178 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:56:32,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:34,692 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:56:34,692 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:56:34,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1754330790] [2021-11-25 17:56:34,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1754330790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:34,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [17610120] [2021-11-25 17:56:34,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:56:34,693 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:56:34,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:56:34,693 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:56:34,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-25 17:56:34,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:56:34,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:34,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 17:56:34,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:37,167 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:56:37,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:42,623 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:56:42,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [17610120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:42,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216186066] [2021-11-25 17:56:42,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 17:56:42,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:42,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:42,624 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:42,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 17:56:42,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 17:56:42,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:56:42,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 17:56:42,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:46,551 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 17:56:46,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:57:00,849 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 17:57:00,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216186066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:57:00,849 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:57:00,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 24, 26] total 88 [2021-11-25 17:57:00,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174738840] [2021-11-25 17:57:00,850 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:57:00,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-25 17:57:00,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:00,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-25 17:57:00,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=803, Invalid=6853, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 17:57:00,854 INFO L87 Difference]: Start difference. First operand 104 states and 137 transitions. Second operand has 88 states, 86 states have (on average 1.6395348837209303) internal successors, (141), 84 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 11 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 17:57:26,177 WARN L227 SmtUtils]: Spent 15.84s on a formula simplification. DAG size of input: 120 DAG size of output: 53 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:57:35,543 WARN L227 SmtUtils]: Spent 6.94s on a formula simplification. DAG size of input: 131 DAG size of output: 49 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:58:14,083 WARN L227 SmtUtils]: Spent 35.73s on a formula simplification. DAG size of input: 126 DAG size of output: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:58:54,700 WARN L227 SmtUtils]: Spent 35.79s on a formula simplification. DAG size of input: 132 DAG size of output: 83 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:17,168 WARN L227 SmtUtils]: Spent 7.39s on a formula simplification. DAG size of input: 141 DAG size of output: 44 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:26,225 WARN L227 SmtUtils]: Spent 8.32s on a formula simplification. DAG size of input: 153 DAG size of output: 53 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:33,144 WARN L227 SmtUtils]: Spent 6.15s on a formula simplification. DAG size of input: 156 DAG size of output: 56 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:38,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:38,906 INFO L93 Difference]: Finished difference Result 166 states and 204 transitions. [2021-11-25 17:59:38,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-25 17:59:38,907 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 86 states have (on average 1.6395348837209303) internal successors, (141), 84 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 11 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 81 [2021-11-25 17:59:38,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:38,909 INFO L225 Difference]: With dead ends: 166 [2021-11-25 17:59:38,909 INFO L226 Difference]: Without dead ends: 142 [2021-11-25 17:59:38,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4325 ImplicationChecksByTransitivity, 170.3s TimeCoverageRelationStatistics Valid=2079, Invalid=14433, Unknown=0, NotChecked=0, Total=16512 [2021-11-25 17:59:38,911 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 383 mSDsluCounter, 2022 mSDsCounter, 0 mSdLazyCounter, 2605 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 393 SdHoareTripleChecker+Valid, 2074 SdHoareTripleChecker+Invalid, 2883 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 2605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:38,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [393 Valid, 2074 Invalid, 2883 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 2605 Invalid, 0 Unknown, 0 Unchecked, 11.3s Time] [2021-11-25 17:59:38,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-25 17:59:38,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 114. [2021-11-25 17:59:38,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 85 states have (on average 1.1529411764705881) internal successors, (98), 87 states have internal predecessors, (98), 18 states have call successors, (18), 7 states have call predecessors, (18), 10 states have return successors, (31), 19 states have call predecessors, (31), 17 states have call successors, (31) [2021-11-25 17:59:38,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 147 transitions. [2021-11-25 17:59:38,927 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 147 transitions. Word has length 81 [2021-11-25 17:59:38,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:38,928 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 147 transitions. [2021-11-25 17:59:38,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 86 states have (on average 1.6395348837209303) internal successors, (141), 84 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 11 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 17:59:38,928 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 147 transitions. [2021-11-25 17:59:38,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 17:59:38,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:38,930 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:38,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:39,142 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (57)] Ended with exit code 0 [2021-11-25 17:59:39,360 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-25 17:59:39,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:39,541 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:59:39,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:39,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1451945505, now seen corresponding path program 1 times [2021-11-25 17:59:39,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:59:39,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2076132840] [2021-11-25 17:59:39,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:39,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:59:39,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:59:39,543 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:59:39,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-25 17:59:39,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:39,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 17:59:39,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:40,484 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:59:40,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:42,910 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:59:42,910 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:59:42,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2076132840] [2021-11-25 17:59:42,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2076132840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:42,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [477090977] [2021-11-25 17:59:42,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:42,911 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:59:42,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:59:42,913 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:59:42,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-25 17:59:43,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:43,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 17:59:43,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:45,326 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:59:45,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:50,050 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 17:59:50,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [477090977] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:59:50,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547222568] [2021-11-25 17:59:50,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:50,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:50,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:50,067 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:50,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 17:59:50,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:50,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 17:59:50,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:54,201 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:59:54,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:02,481 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:02,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547222568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:02,481 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:00:02,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 22, 24] total 83 [2021-11-25 18:00:02,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514914302] [2021-11-25 18:00:02,482 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:02,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 18:00:02,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:00:02,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 18:00:02,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=6192, Unknown=0, NotChecked=0, Total=6806 [2021-11-25 18:00:02,484 INFO L87 Difference]: Start difference. First operand 114 states and 147 transitions. Second operand has 83 states, 81 states have (on average 1.6419753086419753) internal successors, (133), 80 states have internal predecessors, (133), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 18:00:21,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:21,492 INFO L93 Difference]: Finished difference Result 158 states and 194 transitions. [2021-11-25 18:00:21,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 18:00:21,493 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 81 states have (on average 1.6419753086419753) internal successors, (133), 80 states have internal predecessors, (133), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) Word has length 79 [2021-11-25 18:00:21,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:21,495 INFO L225 Difference]: With dead ends: 158 [2021-11-25 18:00:21,495 INFO L226 Difference]: Without dead ends: 138 [2021-11-25 18:00:21,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 386 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3810 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=1714, Invalid=12092, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 18:00:21,497 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 313 mSDsluCounter, 1939 mSDsCounter, 0 mSdLazyCounter, 1962 mSolverCounterSat, 295 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 2006 SdHoareTripleChecker+Invalid, 2257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 1962 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:21,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 2006 Invalid, 2257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 1962 Invalid, 0 Unknown, 0 Unchecked, 8.6s Time] [2021-11-25 18:00:21,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-25 18:00:21,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 123. [2021-11-25 18:00:21,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 93 states have (on average 1.1397849462365592) internal successors, (106), 94 states have internal predecessors, (106), 19 states have call successors, (19), 8 states have call predecessors, (19), 10 states have return successors, (29), 20 states have call predecessors, (29), 18 states have call successors, (29) [2021-11-25 18:00:21,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 154 transitions. [2021-11-25 18:00:21,514 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 154 transitions. Word has length 79 [2021-11-25 18:00:21,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:21,514 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 154 transitions. [2021-11-25 18:00:21,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 81 states have (on average 1.6419753086419753) internal successors, (133), 80 states have internal predecessors, (133), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 18:00:21,515 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 154 transitions. [2021-11-25 18:00:21,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 18:00:21,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:21,516 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:21,550 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-25 18:00:21,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (59)] Ended with exit code 0 [2021-11-25 18:00:21,935 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 0 [2021-11-25 18:00:22,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:00:22,134 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:00:22,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:22,134 INFO L85 PathProgramCache]: Analyzing trace with hash -476190709, now seen corresponding path program 1 times [2021-11-25 18:00:22,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:00:22,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1375271182] [2021-11-25 18:00:22,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:22,135 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:00:22,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:00:22,136 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:00:22,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-25 18:00:22,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:22,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:00:22,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:22,440 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:22,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:22,801 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:22,801 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:00:22,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1375271182] [2021-11-25 18:00:22,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1375271182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:22,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [445582554] [2021-11-25 18:00:22,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:22,802 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:00:22,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:00:22,803 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:00:22,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-25 18:00:22,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:22,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:00:22,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:23,042 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:23,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:23,289 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:23,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [445582554] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:23,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666961421] [2021-11-25 18:00:23,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:23,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:23,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:23,295 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:23,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-25 18:00:23,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:23,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:00:23,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:23,540 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:23,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:23,788 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:23,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666961421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:23,788 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:00:23,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 15 [2021-11-25 18:00:23,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964054435] [2021-11-25 18:00:23,789 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:23,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 18:00:23,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:00:23,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 18:00:23,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:00:23,790 INFO L87 Difference]: Start difference. First operand 123 states and 154 transitions. Second operand has 15 states, 15 states have (on average 4.4) internal successors, (66), 15 states have internal predecessors, (66), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 18:00:24,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:00:24,306 INFO L93 Difference]: Finished difference Result 132 states and 162 transitions. [2021-11-25 18:00:24,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:00:24,306 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.4) internal successors, (66), 15 states have internal predecessors, (66), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 82 [2021-11-25 18:00:24,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:00:24,308 INFO L225 Difference]: With dead ends: 132 [2021-11-25 18:00:24,308 INFO L226 Difference]: Without dead ends: 121 [2021-11-25 18:00:24,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:00:24,309 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 140 mSDsluCounter, 501 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:00:24,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 579 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:00:24,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-25 18:00:24,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-11-25 18:00:24,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 92 states have (on average 1.141304347826087) internal successors, (105), 93 states have internal predecessors, (105), 18 states have call successors, (18), 8 states have call predecessors, (18), 10 states have return successors, (27), 19 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-25 18:00:24,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 150 transitions. [2021-11-25 18:00:24,325 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 150 transitions. Word has length 82 [2021-11-25 18:00:24,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:00:24,325 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 150 transitions. [2021-11-25 18:00:24,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.4) internal successors, (66), 15 states have internal predecessors, (66), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 18:00:24,326 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 150 transitions. [2021-11-25 18:00:24,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 18:00:24,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:00:24,327 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:00:24,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:24,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:24,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-25 18:00:24,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:00:24,947 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:00:24,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:00:24,947 INFO L85 PathProgramCache]: Analyzing trace with hash -1133603807, now seen corresponding path program 2 times [2021-11-25 18:00:24,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:00:24,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1248154414] [2021-11-25 18:00:24,948 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:00:24,948 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:00:24,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:00:24,955 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:00:24,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-25 18:00:25,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:00:25,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:25,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 18:00:25,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:25,882 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:00:25,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:28,298 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:28,298 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:00:28,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1248154414] [2021-11-25 18:00:28,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1248154414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:28,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [814080459] [2021-11-25 18:00:28,299 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:00:28,299 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:00:28,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:00:28,300 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:00:28,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-25 18:00:28,458 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:00:28,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:28,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 18:00:28,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:30,611 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:00:30,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:35,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [814080459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:35,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166709194] [2021-11-25 18:00:35,377 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:00:35,377 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:35,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:35,378 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:35,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-25 18:00:35,554 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:00:35,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:00:35,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:00:35,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:00:39,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:45,595 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:00:45,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166709194] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:45,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:00:45,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 22, 24] total 77 [2021-11-25 18:00:45,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949530758] [2021-11-25 18:00:45,596 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:45,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 18:00:45,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:00:45,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 18:00:45,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=5314, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 18:00:45,598 INFO L87 Difference]: Start difference. First operand 121 states and 150 transitions. Second operand has 77 states, 75 states have (on average 1.68) internal successors, (126), 74 states have internal predecessors, (126), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 18:01:11,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:11,977 INFO L93 Difference]: Finished difference Result 178 states and 211 transitions. [2021-11-25 18:01:11,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 18:01:11,977 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 75 states have (on average 1.68) internal successors, (126), 74 states have internal predecessors, (126), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 79 [2021-11-25 18:01:11,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:11,979 INFO L225 Difference]: With dead ends: 178 [2021-11-25 18:01:11,979 INFO L226 Difference]: Without dead ends: 135 [2021-11-25 18:01:11,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 392 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3463 ImplicationChecksByTransitivity, 33.0s TimeCoverageRelationStatistics Valid=1737, Invalid=11603, Unknown=0, NotChecked=0, Total=13340 [2021-11-25 18:01:11,988 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 304 mSDsluCounter, 2104 mSDsCounter, 0 mSdLazyCounter, 1991 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 2178 SdHoareTripleChecker+Invalid, 2299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 1991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:11,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 2178 Invalid, 2299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 1991 Invalid, 0 Unknown, 0 Unchecked, 8.5s Time] [2021-11-25 18:01:11,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-25 18:01:11,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 127. [2021-11-25 18:01:11,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 98 states have (on average 1.1224489795918366) internal successors, (110), 97 states have internal predecessors, (110), 19 states have call successors, (19), 9 states have call predecessors, (19), 9 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 18:01:11,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 154 transitions. [2021-11-25 18:01:11,999 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 154 transitions. Word has length 79 [2021-11-25 18:01:11,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:11,999 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 154 transitions. [2021-11-25 18:01:11,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 75 states have (on average 1.68) internal successors, (126), 74 states have internal predecessors, (126), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 18:01:11,999 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 154 transitions. [2021-11-25 18:01:12,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 18:01:12,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:12,001 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:12,023 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-25 18:01:12,217 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (65)] Ended with exit code 0 [2021-11-25 18:01:12,412 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (66)] Ended with exit code 0 [2021-11-25 18:01:12,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:01:12,611 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:01:12,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:12,611 INFO L85 PathProgramCache]: Analyzing trace with hash -514341681, now seen corresponding path program 2 times [2021-11-25 18:01:12,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:01:12,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [289289544] [2021-11-25 18:01:12,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:01:12,612 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:01:12,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:01:12,613 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:01:12,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-25 18:01:12,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:01:12,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:01:12,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:01:12,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:12,918 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:01:12,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:13,286 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:01:13,286 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:01:13,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [289289544] [2021-11-25 18:01:13,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [289289544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:13,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1738292729] [2021-11-25 18:01:13,287 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:01:13,287 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:01:13,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:01:13,288 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:01:13,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-25 18:01:13,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:01:13,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:01:13,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:01:13,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:13,546 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:01:13,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:13,800 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:01:13,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1738292729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:13,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540856482] [2021-11-25 18:01:13,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:01:13,801 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:13,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:13,801 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:13,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-25 18:01:13,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:01:13,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:01:13,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:01:13,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:14,030 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:01:14,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:14,277 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:01:14,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540856482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:14,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:01:14,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 15 [2021-11-25 18:01:14,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510611383] [2021-11-25 18:01:14,278 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:14,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 18:01:14,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:01:14,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 18:01:14,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:01:14,280 INFO L87 Difference]: Start difference. First operand 127 states and 154 transitions. Second operand has 15 states, 15 states have (on average 4.4) internal successors, (66), 15 states have internal predecessors, (66), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 18:01:14,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:14,739 INFO L93 Difference]: Finished difference Result 134 states and 160 transitions. [2021-11-25 18:01:14,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:01:14,740 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.4) internal successors, (66), 15 states have internal predecessors, (66), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 82 [2021-11-25 18:01:14,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:14,742 INFO L225 Difference]: With dead ends: 134 [2021-11-25 18:01:14,742 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 18:01:14,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:01:14,743 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 125 mSDsluCounter, 590 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:14,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 666 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:01:14,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 18:01:14,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2021-11-25 18:01:14,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 92 states have (on average 1.1195652173913044) internal successors, (103), 91 states have internal predecessors, (103), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (22), 18 states have call predecessors, (22), 17 states have call successors, (22) [2021-11-25 18:01:14,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 143 transitions. [2021-11-25 18:01:14,758 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 143 transitions. Word has length 82 [2021-11-25 18:01:14,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:14,759 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 143 transitions. [2021-11-25 18:01:14,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.4) internal successors, (66), 15 states have internal predecessors, (66), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 18:01:14,759 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 143 transitions. [2021-11-25 18:01:14,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-25 18:01:14,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:14,760 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:14,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:14,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:15,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (69)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:15,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:01:15,383 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:01:15,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:15,383 INFO L85 PathProgramCache]: Analyzing trace with hash 608590994, now seen corresponding path program 1 times [2021-11-25 18:01:15,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:01:15,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2101099675] [2021-11-25 18:01:15,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:15,384 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:01:15,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:01:15,385 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:01:15,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-25 18:01:15,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:15,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:01:15,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:17,726 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:01:17,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:25,864 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:01:25,864 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:01:25,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2101099675] [2021-11-25 18:01:25,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2101099675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:25,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [955060928] [2021-11-25 18:01:25,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:25,865 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:01:25,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:01:25,865 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:01:25,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-25 18:01:26,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:26,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 18:01:26,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:33,920 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:01:33,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:50,430 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:01:50,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [955060928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:50,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129197305] [2021-11-25 18:01:50,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:50,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:50,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:50,432 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:50,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-25 18:01:51,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:51,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 18:01:51,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:54,242 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:01:54,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:56,436 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:01:56,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129197305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:56,436 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:01:56,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 26, 25, 26, 25] total 82 [2021-11-25 18:01:56,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349101603] [2021-11-25 18:01:56,437 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:56,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-25 18:01:56,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:01:56,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-25 18:01:56,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=6296, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 18:01:56,439 INFO L87 Difference]: Start difference. First operand 119 states and 143 transitions. Second operand has 82 states, 78 states have (on average 1.5) internal successors, (117), 75 states have internal predecessors, (117), 20 states have call successors, (23), 2 states have call predecessors, (23), 9 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25) [2021-11-25 18:02:46,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:46,681 INFO L93 Difference]: Finished difference Result 131 states and 156 transitions. [2021-11-25 18:02:46,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-25 18:02:46,683 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 78 states have (on average 1.5) internal successors, (117), 75 states have internal predecessors, (117), 20 states have call successors, (23), 2 states have call predecessors, (23), 9 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25) Word has length 86 [2021-11-25 18:02:46,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:46,683 INFO L225 Difference]: With dead ends: 131 [2021-11-25 18:02:46,683 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 18:02:46,684 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 426 SyntacticMatches, 4 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2908 ImplicationChecksByTransitivity, 68.3s TimeCoverageRelationStatistics Valid=815, Invalid=10957, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 18:02:46,685 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 156 mSDsluCounter, 2076 mSDsCounter, 0 mSdLazyCounter, 1773 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 2136 SdHoareTripleChecker+Invalid, 2093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 1773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 134 IncrementalHoareTripleChecker+Unchecked, 14.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:46,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 2136 Invalid, 2093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 1773 Invalid, 0 Unknown, 134 Unchecked, 14.5s Time] [2021-11-25 18:02:46,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 18:02:46,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 121. [2021-11-25 18:02:46,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 94 states have (on average 1.1170212765957446) internal successors, (105), 92 states have internal predecessors, (105), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (22), 19 states have call predecessors, (22), 17 states have call successors, (22) [2021-11-25 18:02:46,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2021-11-25 18:02:46,697 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 86 [2021-11-25 18:02:46,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:46,697 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2021-11-25 18:02:46,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 78 states have (on average 1.5) internal successors, (117), 75 states have internal predecessors, (117), 20 states have call successors, (23), 2 states have call predecessors, (23), 9 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25) [2021-11-25 18:02:46,698 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2021-11-25 18:02:46,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-25 18:02:46,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:46,699 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:46,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:46,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:47,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-25 18:02:47,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:47,313 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:02:47,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:47,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1561964758, now seen corresponding path program 2 times [2021-11-25 18:02:47,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:02:47,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2092462374] [2021-11-25 18:02:47,314 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:02:47,314 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:02:47,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:02:47,315 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:02:47,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-25 18:02:47,417 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:02:47,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:47,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:02:47,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:49,564 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:02:49,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:57,481 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:02:57,481 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:02:57,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2092462374] [2021-11-25 18:02:57,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2092462374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:57,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [137605246] [2021-11-25 18:02:57,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:02:57,481 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:02:57,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:02:57,482 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:02:57,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-25 18:02:57,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:02:57,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:57,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 18:02:57,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:05,921 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:03:05,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:21,757 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:03:21,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [137605246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:21,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756764845] [2021-11-25 18:03:21,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:03:21,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:21,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:21,772 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:21,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-25 18:03:22,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:03:22,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:03:22,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 18:03:22,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:27,945 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 11 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:03:27,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:49,081 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 11 proven. 20 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:03:49,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756764845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:03:49,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:03:49,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 26, 25, 28, 28] total 115 [2021-11-25 18:03:49,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036755438] [2021-11-25 18:03:49,082 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:03:49,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-25 18:03:49,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:03:49,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-25 18:03:49,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=12505, Unknown=0, NotChecked=0, Total=13110 [2021-11-25 18:03:49,084 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand has 115 states, 108 states have (on average 1.4444444444444444) internal successors, (156), 105 states have internal predecessors, (156), 28 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (35), 30 states have call predecessors, (35), 27 states have call successors, (35) [2021-11-25 18:04:46,420 WARN L227 SmtUtils]: Spent 8.51s on a formula simplification. DAG size of input: 160 DAG size of output: 154 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:05:15,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:05:15,414 INFO L93 Difference]: Finished difference Result 137 states and 160 transitions. [2021-11-25 18:05:15,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 18:05:15,414 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 108 states have (on average 1.4444444444444444) internal successors, (156), 105 states have internal predecessors, (156), 28 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (35), 30 states have call predecessors, (35), 27 states have call successors, (35) Word has length 86 [2021-11-25 18:05:15,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:05:15,415 INFO L225 Difference]: With dead ends: 137 [2021-11-25 18:05:15,415 INFO L226 Difference]: Without dead ends: 132 [2021-11-25 18:05:15,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5850 ImplicationChecksByTransitivity, 118.1s TimeCoverageRelationStatistics Valid=1352, Invalid=19240, Unknown=0, NotChecked=0, Total=20592 [2021-11-25 18:05:15,416 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 276 mSDsluCounter, 2399 mSDsCounter, 0 mSdLazyCounter, 2507 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 2451 SdHoareTripleChecker+Invalid, 2958 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 2507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 21.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:05:15,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 2451 Invalid, 2958 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 2507 Invalid, 0 Unknown, 106 Unchecked, 21.2s Time] [2021-11-25 18:05:15,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-25 18:05:15,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 119. [2021-11-25 18:05:15,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 92 states have (on average 1.108695652173913) internal successors, (102), 91 states have internal predecessors, (102), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (22), 18 states have call predecessors, (22), 17 states have call successors, (22) [2021-11-25 18:05:15,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 142 transitions. [2021-11-25 18:05:15,437 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 142 transitions. Word has length 86 [2021-11-25 18:05:15,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:05:15,438 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 142 transitions. [2021-11-25 18:05:15,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 108 states have (on average 1.4444444444444444) internal successors, (156), 105 states have internal predecessors, (156), 28 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (35), 30 states have call predecessors, (35), 27 states have call successors, (35) [2021-11-25 18:05:15,438 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 142 transitions. [2021-11-25 18:05:15,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-25 18:05:15,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:05:15,440 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:05:15,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:15,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:15,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-25 18:05:16,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:16,047 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:05:16,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:05:16,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1357497146, now seen corresponding path program 1 times [2021-11-25 18:05:16,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:05:16,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2106618124] [2021-11-25 18:05:16,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:16,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:05:16,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:05:16,049 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:05:16,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-25 18:05:16,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:16,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 18:05:16,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:18,027 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:05:18,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:24,488 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:05:24,488 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:05:24,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2106618124] [2021-11-25 18:05:24,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2106618124] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:05:24,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [319647088] [2021-11-25 18:05:24,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:24,488 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:05:24,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:05:24,489 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:05:24,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-25 18:05:24,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:24,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 18:05:24,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:31,655 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:05:31,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:45,595 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:05:45,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [319647088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:05:45,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527692623] [2021-11-25 18:05:45,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:45,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:45,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:05:45,596 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:05:45,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-25 18:05:46,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:46,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 18:05:46,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:47,732 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 18 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:05:47,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:54,925 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:05:54,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527692623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:05:54,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:05:54,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 24, 23, 26, 25] total 81 [2021-11-25 18:05:54,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009863499] [2021-11-25 18:05:54,926 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:05:54,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 18:05:54,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:05:54,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 18:05:54,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=6082, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 18:05:54,928 INFO L87 Difference]: Start difference. First operand 119 states and 142 transitions. Second operand has 81 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 74 states have internal predecessors, (120), 22 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (28), 23 states have call predecessors, (28), 21 states have call successors, (28) [2021-11-25 18:06:39,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:39,200 INFO L93 Difference]: Finished difference Result 131 states and 153 transitions. [2021-11-25 18:06:39,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 18:06:39,202 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 74 states have internal predecessors, (120), 22 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (28), 23 states have call predecessors, (28), 21 states have call successors, (28) Word has length 84 [2021-11-25 18:06:39,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:39,203 INFO L225 Difference]: With dead ends: 131 [2021-11-25 18:06:39,203 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 18:06:39,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 418 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2913 ImplicationChecksByTransitivity, 59.9s TimeCoverageRelationStatistics Valid=1070, Invalid=11361, Unknown=1, NotChecked=0, Total=12432 [2021-11-25 18:06:39,205 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 194 mSDsluCounter, 1737 mSDsCounter, 0 mSdLazyCounter, 1792 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 1784 SdHoareTripleChecker+Invalid, 2107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 1792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 14.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:39,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 1784 Invalid, 2107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 1792 Invalid, 0 Unknown, 104 Unchecked, 14.4s Time] [2021-11-25 18:06:39,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 18:06:39,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2021-11-25 18:06:39,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 83 states have (on average 1.1204819277108433) internal successors, (93), 83 states have internal predecessors, (93), 16 states have call successors, (16), 8 states have call predecessors, (16), 8 states have return successors, (19), 16 states have call predecessors, (19), 15 states have call successors, (19) [2021-11-25 18:06:39,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 128 transitions. [2021-11-25 18:06:39,220 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 128 transitions. Word has length 84 [2021-11-25 18:06:39,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:39,220 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 128 transitions. [2021-11-25 18:06:39,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 74 states have internal predecessors, (120), 22 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (28), 23 states have call predecessors, (28), 21 states have call successors, (28) [2021-11-25 18:06:39,221 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 128 transitions. [2021-11-25 18:06:39,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-25 18:06:39,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:39,222 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:39,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (78)] Forceful destruction successful, exit code 0 [2021-11-25 18:06:39,452 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-25 18:06:39,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2021-11-25 18:06:39,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:39,827 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:39,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:39,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1014343994, now seen corresponding path program 2 times [2021-11-25 18:06:39,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:06:39,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2024892897] [2021-11-25 18:06:39,830 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:06:39,830 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:06:39,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:06:39,833 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:06:39,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-25 18:06:39,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:06:39,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:39,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 18:06:39,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:41,651 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:06:41,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:47,761 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:06:47,761 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:06:47,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2024892897] [2021-11-25 18:06:47,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2024892897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:47,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2031082491] [2021-11-25 18:06:47,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:06:47,762 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:06:47,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:06:47,762 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:06:47,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-25 18:06:48,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:06:48,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:48,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 18:06:48,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:54,050 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:06:54,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:06,740 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:07:06,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2031082491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:06,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521624804] [2021-11-25 18:07:06,740 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:07:06,740 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:06,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:06,741 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:06,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0e49401-e9aa-4850-8f7b-cdab964c9624/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-25 18:07:07,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:07:07,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:07,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 18:07:07,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:08,163 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:07:08,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:10,214 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 18:07:10,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521624804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:10,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:07:10,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 24, 23, 24, 23] total 74 [2021-11-25 18:07:10,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454718790] [2021-11-25 18:07:10,215 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:10,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-25 18:07:10,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:07:10,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-25 18:07:10,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=5081, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 18:07:10,217 INFO L87 Difference]: Start difference. First operand 108 states and 128 transitions. Second operand has 74 states, 70 states have (on average 1.5571428571428572) internal successors, (109), 67 states have internal predecessors, (109), 20 states have call successors, (23), 2 states have call predecessors, (23), 9 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25)