./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW --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 0c76345a7418e3e3e542d36688efe541ee3690f4974296017bb3a3a18fafce6e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 13:41:28,772 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 13:41:28,775 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 13:41:28,815 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 13:41:28,815 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 13:41:28,819 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 13:41:28,821 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 13:41:28,823 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 13:41:28,825 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 13:41:28,830 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 13:41:28,832 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 13:41:28,833 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 13:41:28,834 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 13:41:28,836 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 13:41:28,838 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 13:41:28,839 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 13:41:28,840 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 13:41:28,841 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 13:41:28,843 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 13:41:28,849 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 13:41:28,851 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 13:41:28,853 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 13:41:28,854 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 13:41:28,855 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 13:41:28,863 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 13:41:28,864 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 13:41:28,864 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 13:41:28,866 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 13:41:28,866 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 13:41:28,869 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 13:41:28,870 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 13:41:28,871 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 13:41:28,872 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 13:41:28,873 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 13:41:28,875 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 13:41:28,875 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 13:41:28,876 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 13:41:28,876 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 13:41:28,877 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 13:41:28,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 13:41:28,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 13:41:28,879 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 13:41:28,918 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 13:41:28,918 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 13:41:28,919 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 13:41:28,919 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 13:41:28,920 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 13:41:28,920 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 13:41:28,920 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 13:41:28,921 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 13:41:28,921 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 13:41:28,921 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 13:41:28,922 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 13:41:28,922 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 13:41:28,923 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 13:41:28,923 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 13:41:28,923 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 13:41:28,923 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 13:41:28,923 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 13:41:28,924 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 13:41:28,925 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 13:41:28,925 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 13:41:28,925 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 13:41:28,925 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 13:41:28,926 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 13:41:28,926 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 13:41:28,926 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 13:41:28,926 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 13:41:28,927 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 13:41:28,927 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 13:41:28,927 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 13:41:28,927 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 13:41:28,928 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 13:41:28,928 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 13:41:28,928 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:41:28,929 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 13:41:28,929 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 13:41:28,929 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 13:41:28,929 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 13:41:28,929 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 13:41:28,930 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 13:41:28,930 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 13:41:28,930 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 13:41:28,930 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0c76345a7418e3e3e542d36688efe541ee3690f4974296017bb3a3a18fafce6e [2022-11-23 13:41:29,257 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 13:41:29,289 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 13:41:29,292 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 13:41:29,293 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 13:41:29,293 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 13:41:29,295 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c [2022-11-23 13:41:32,295 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 13:41:32,618 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 13:41:32,635 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c [2022-11-23 13:41:32,656 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/data/c5fad566c/1299e5ecd9e443c089dba34f292bcc44/FLAGd22475d91 [2022-11-23 13:41:32,678 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/data/c5fad566c/1299e5ecd9e443c089dba34f292bcc44 [2022-11-23 13:41:32,681 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 13:41:32,683 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 13:41:32,687 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 13:41:32,687 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 13:41:32,690 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 13:41:32,691 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:41:32" (1/1) ... [2022-11-23 13:41:32,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51cc485c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:32, skipping insertion in model container [2022-11-23 13:41:32,693 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:41:32" (1/1) ... [2022-11-23 13:41:32,700 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 13:41:32,771 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 13:41:32,969 WARN L237 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_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c[913,926] [2022-11-23 13:41:33,036 WARN L237 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_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c[5977,5990] [2022-11-23 13:41:33,168 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:41:33,180 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 13:41:33,199 WARN L237 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_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c[913,926] [2022-11-23 13:41:33,214 WARN L237 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_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.13.cil-1.c[5977,5990] [2022-11-23 13:41:33,275 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:41:33,307 INFO L208 MainTranslator]: Completed translation [2022-11-23 13:41:33,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33 WrapperNode [2022-11-23 13:41:33,308 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 13:41:33,309 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 13:41:33,309 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 13:41:33,309 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 13:41:33,317 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,334 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,429 INFO L138 Inliner]: procedures = 74, calls = 88, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 1118 [2022-11-23 13:41:33,430 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 13:41:33,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 13:41:33,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 13:41:33,439 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 13:41:33,449 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,449 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,459 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,461 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,477 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,508 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,529 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,533 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,538 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 13:41:33,539 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 13:41:33,539 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 13:41:33,542 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 13:41:33,543 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (1/1) ... [2022-11-23 13:41:33,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:41:33,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:41:33,571 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 13:41:33,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 13:41:33,605 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 13:41:33,605 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-23 13:41:33,606 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-23 13:41:33,606 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2022-11-23 13:41:33,606 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2022-11-23 13:41:33,606 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-23 13:41:33,606 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-23 13:41:33,606 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-23 13:41:33,606 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-23 13:41:33,606 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-23 13:41:33,606 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-23 13:41:33,607 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-23 13:41:33,607 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-23 13:41:33,607 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-23 13:41:33,607 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-23 13:41:33,607 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 13:41:33,607 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-23 13:41:33,607 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-23 13:41:33,607 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 13:41:33,608 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 13:41:33,608 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-23 13:41:33,608 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-23 13:41:33,608 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-23 13:41:33,608 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-23 13:41:33,747 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 13:41:33,749 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 13:41:34,925 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 13:41:35,594 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 13:41:35,594 INFO L300 CfgBuilder]: Removed 20 assume(true) statements. [2022-11-23 13:41:35,599 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:41:35 BoogieIcfgContainer [2022-11-23 13:41:35,599 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 13:41:35,601 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 13:41:35,602 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 13:41:35,605 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 13:41:35,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:41:32" (1/3) ... [2022-11-23 13:41:35,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14e20203 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:41:35, skipping insertion in model container [2022-11-23 13:41:35,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:41:33" (2/3) ... [2022-11-23 13:41:35,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14e20203 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:41:35, skipping insertion in model container [2022-11-23 13:41:35,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:41:35" (3/3) ... [2022-11-23 13:41:35,610 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.13.cil-1.c [2022-11-23 13:41:35,630 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 13:41:35,630 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-23 13:41:35,706 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 13:41:35,714 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4a733715, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 13:41:35,715 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-23 13:41:35,721 INFO L276 IsEmpty]: Start isEmpty. Operand has 256 states, 208 states have (on average 1.5721153846153846) internal successors, (327), 215 states have internal predecessors, (327), 35 states have call successors, (35), 10 states have call predecessors, (35), 10 states have return successors, (35), 33 states have call predecessors, (35), 35 states have call successors, (35) [2022-11-23 13:41:35,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-23 13:41:35,732 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:35,732 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:35,733 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:35,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:35,741 INFO L85 PathProgramCache]: Analyzing trace with hash -398235532, now seen corresponding path program 1 times [2022-11-23 13:41:35,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:35,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177282817] [2022-11-23 13:41:35,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:35,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:35,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:36,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:41:36,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:36,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177282817] [2022-11-23 13:41:36,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177282817] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:36,138 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:36,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:41:36,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452096988] [2022-11-23 13:41:36,140 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:36,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:41:36,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:36,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:41:36,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:36,195 INFO L87 Difference]: Start difference. First operand has 256 states, 208 states have (on average 1.5721153846153846) internal successors, (327), 215 states have internal predecessors, (327), 35 states have call successors, (35), 10 states have call predecessors, (35), 10 states have return successors, (35), 33 states have call predecessors, (35), 35 states have call successors, (35) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:41:36,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:36,501 INFO L93 Difference]: Finished difference Result 544 states and 842 transitions. [2022-11-23 13:41:36,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:41:36,504 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-11-23 13:41:36,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:36,519 INFO L225 Difference]: With dead ends: 544 [2022-11-23 13:41:36,519 INFO L226 Difference]: Without dead ends: 288 [2022-11-23 13:41:36,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:36,533 INFO L413 NwaCegarLoop]: 335 mSDtfsCounter, 362 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:36,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [362 Valid, 390 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:41:36,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2022-11-23 13:41:36,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 284. [2022-11-23 13:41:36,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 234 states have (on average 1.5128205128205128) internal successors, (354), 238 states have internal predecessors, (354), 38 states have call successors, (38), 12 states have call predecessors, (38), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2022-11-23 13:41:36,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 426 transitions. [2022-11-23 13:41:36,608 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 426 transitions. Word has length 28 [2022-11-23 13:41:36,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:36,608 INFO L495 AbstractCegarLoop]: Abstraction has 284 states and 426 transitions. [2022-11-23 13:41:36,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:41:36,609 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 426 transitions. [2022-11-23 13:41:36,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 13:41:36,611 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:36,611 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:36,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 13:41:36,612 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:36,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:36,613 INFO L85 PathProgramCache]: Analyzing trace with hash -359704688, now seen corresponding path program 1 times [2022-11-23 13:41:36,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:36,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365445917] [2022-11-23 13:41:36,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:36,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:36,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:36,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:41:36,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:36,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365445917] [2022-11-23 13:41:36,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365445917] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:36,732 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:36,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:41:36,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813706374] [2022-11-23 13:41:36,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:36,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:41:36,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:36,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:41:36,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:36,735 INFO L87 Difference]: Start difference. First operand 284 states and 426 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:41:36,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:36,871 INFO L93 Difference]: Finished difference Result 440 states and 643 transitions. [2022-11-23 13:41:36,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:41:36,872 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-11-23 13:41:36,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:36,874 INFO L225 Difference]: With dead ends: 440 [2022-11-23 13:41:36,875 INFO L226 Difference]: Without dead ends: 359 [2022-11-23 13:41:36,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:36,876 INFO L413 NwaCegarLoop]: 322 mSDtfsCounter, 360 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:36,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [360 Valid, 375 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:41:36,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2022-11-23 13:41:36,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 355. [2022-11-23 13:41:36,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 294 states have (on average 1.4795918367346939) internal successors, (435), 298 states have internal predecessors, (435), 45 states have call successors, (45), 16 states have call predecessors, (45), 14 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2022-11-23 13:41:36,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 521 transitions. [2022-11-23 13:41:36,908 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 521 transitions. Word has length 29 [2022-11-23 13:41:36,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:36,908 INFO L495 AbstractCegarLoop]: Abstraction has 355 states and 521 transitions. [2022-11-23 13:41:36,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:41:36,909 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 521 transitions. [2022-11-23 13:41:36,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-23 13:41:36,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:36,911 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:36,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 13:41:36,911 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:36,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:36,912 INFO L85 PathProgramCache]: Analyzing trace with hash -1859151542, now seen corresponding path program 1 times [2022-11-23 13:41:36,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:36,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351070687] [2022-11-23 13:41:36,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:36,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:36,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:36,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:41:36,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:36,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351070687] [2022-11-23 13:41:36,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351070687] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:36,971 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:36,971 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:41:36,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054331578] [2022-11-23 13:41:36,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:36,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:41:36,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:36,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:41:36,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:36,972 INFO L87 Difference]: Start difference. First operand 355 states and 521 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:41:37,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:37,190 INFO L93 Difference]: Finished difference Result 595 states and 849 transitions. [2022-11-23 13:41:37,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:41:37,191 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2022-11-23 13:41:37,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:37,194 INFO L225 Difference]: With dead ends: 595 [2022-11-23 13:41:37,194 INFO L226 Difference]: Without dead ends: 443 [2022-11-23 13:41:37,199 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:37,202 INFO L413 NwaCegarLoop]: 332 mSDtfsCounter, 46 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:37,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 635 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:41:37,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-11-23 13:41:37,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 429. [2022-11-23 13:41:37,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 357 states have (on average 1.4565826330532212) internal successors, (520), 363 states have internal predecessors, (520), 51 states have call successors, (51), 21 states have call predecessors, (51), 19 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2022-11-23 13:41:37,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 618 transitions. [2022-11-23 13:41:37,250 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 618 transitions. Word has length 30 [2022-11-23 13:41:37,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:37,251 INFO L495 AbstractCegarLoop]: Abstraction has 429 states and 618 transitions. [2022-11-23 13:41:37,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:41:37,251 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 618 transitions. [2022-11-23 13:41:37,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-23 13:41:37,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:37,263 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:37,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 13:41:37,263 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:37,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:37,266 INFO L85 PathProgramCache]: Analyzing trace with hash -15631515, now seen corresponding path program 1 times [2022-11-23 13:41:37,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:37,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294610445] [2022-11-23 13:41:37,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:37,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:37,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:37,403 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 13:41:37,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:37,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294610445] [2022-11-23 13:41:37,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294610445] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:37,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:37,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:41:37,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928341219] [2022-11-23 13:41:37,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:37,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:41:37,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:37,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:41:37,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:37,407 INFO L87 Difference]: Start difference. First operand 429 states and 618 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 13:41:37,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:37,579 INFO L93 Difference]: Finished difference Result 592 states and 836 transitions. [2022-11-23 13:41:37,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:41:37,580 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2022-11-23 13:41:37,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:37,584 INFO L225 Difference]: With dead ends: 592 [2022-11-23 13:41:37,584 INFO L226 Difference]: Without dead ends: 434 [2022-11-23 13:41:37,587 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:37,594 INFO L413 NwaCegarLoop]: 351 mSDtfsCounter, 32 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 667 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:37,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 667 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:41:37,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2022-11-23 13:41:37,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 423. [2022-11-23 13:41:37,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 351 states have (on average 1.4415954415954415) internal successors, (506), 357 states have internal predecessors, (506), 51 states have call successors, (51), 21 states have call predecessors, (51), 19 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2022-11-23 13:41:37,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 604 transitions. [2022-11-23 13:41:37,629 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 604 transitions. Word has length 43 [2022-11-23 13:41:37,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:37,630 INFO L495 AbstractCegarLoop]: Abstraction has 423 states and 604 transitions. [2022-11-23 13:41:37,630 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 13:41:37,630 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 604 transitions. [2022-11-23 13:41:37,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-23 13:41:37,632 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:37,632 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:37,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 13:41:37,633 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:37,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:37,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1078002634, now seen corresponding path program 1 times [2022-11-23 13:41:37,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:37,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55675401] [2022-11-23 13:41:37,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:37,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:37,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:37,696 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-23 13:41:37,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:37,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55675401] [2022-11-23 13:41:37,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55675401] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:37,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:37,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:41:37,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766060378] [2022-11-23 13:41:37,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:37,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:41:37,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:37,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:41:37,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:37,698 INFO L87 Difference]: Start difference. First operand 423 states and 604 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 13:41:37,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:37,852 INFO L93 Difference]: Finished difference Result 672 states and 928 transitions. [2022-11-23 13:41:37,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:41:37,853 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2022-11-23 13:41:37,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:37,856 INFO L225 Difference]: With dead ends: 672 [2022-11-23 13:41:37,856 INFO L226 Difference]: Without dead ends: 469 [2022-11-23 13:41:37,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:41:37,858 INFO L413 NwaCegarLoop]: 321 mSDtfsCounter, 346 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:37,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 373 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:41:37,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2022-11-23 13:41:37,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 469. [2022-11-23 13:41:37,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 390 states have (on average 1.4076923076923078) internal successors, (549), 396 states have internal predecessors, (549), 55 states have call successors, (55), 24 states have call predecessors, (55), 22 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2022-11-23 13:41:37,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 655 transitions. [2022-11-23 13:41:37,897 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 655 transitions. Word has length 46 [2022-11-23 13:41:37,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:37,898 INFO L495 AbstractCegarLoop]: Abstraction has 469 states and 655 transitions. [2022-11-23 13:41:37,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 13:41:37,899 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 655 transitions. [2022-11-23 13:41:37,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 13:41:37,900 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:37,900 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:37,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 13:41:37,901 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:37,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:37,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1267414843, now seen corresponding path program 1 times [2022-11-23 13:41:37,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:37,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180677297] [2022-11-23 13:41:37,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:37,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:37,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:37,963 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:41:37,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:37,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180677297] [2022-11-23 13:41:37,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180677297] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:37,965 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:37,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 13:41:37,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168842275] [2022-11-23 13:41:37,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:37,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:41:37,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:37,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:41:37,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:41:37,967 INFO L87 Difference]: Start difference. First operand 469 states and 655 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 13:41:38,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:38,274 INFO L93 Difference]: Finished difference Result 696 states and 955 transitions. [2022-11-23 13:41:38,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:41:38,274 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2022-11-23 13:41:38,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:38,279 INFO L225 Difference]: With dead ends: 696 [2022-11-23 13:41:38,279 INFO L226 Difference]: Without dead ends: 467 [2022-11-23 13:41:38,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:41:38,281 INFO L413 NwaCegarLoop]: 349 mSDtfsCounter, 401 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 624 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:38,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [401 Valid, 624 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 13:41:38,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2022-11-23 13:41:38,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 465. [2022-11-23 13:41:38,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 386 states have (on average 1.3808290155440415) internal successors, (533), 392 states have internal predecessors, (533), 55 states have call successors, (55), 24 states have call predecessors, (55), 22 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2022-11-23 13:41:38,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 639 transitions. [2022-11-23 13:41:38,324 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 639 transitions. Word has length 47 [2022-11-23 13:41:38,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:38,324 INFO L495 AbstractCegarLoop]: Abstraction has 465 states and 639 transitions. [2022-11-23 13:41:38,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 13:41:38,325 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 639 transitions. [2022-11-23 13:41:38,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 13:41:38,327 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:38,327 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:38,327 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-23 13:41:38,327 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:38,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:38,328 INFO L85 PathProgramCache]: Analyzing trace with hash -394576188, now seen corresponding path program 1 times [2022-11-23 13:41:38,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:38,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893893463] [2022-11-23 13:41:38,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:38,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:38,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:38,428 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-23 13:41:38,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:38,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893893463] [2022-11-23 13:41:38,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893893463] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:41:38,429 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:41:38,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 13:41:38,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374196514] [2022-11-23 13:41:38,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:41:38,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:41:38,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:41:38,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:41:38,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:41:38,431 INFO L87 Difference]: Start difference. First operand 465 states and 639 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 13:41:38,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:41:38,760 INFO L93 Difference]: Finished difference Result 501 states and 680 transitions. [2022-11-23 13:41:38,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:41:38,760 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2022-11-23 13:41:38,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:41:38,763 INFO L225 Difference]: With dead ends: 501 [2022-11-23 13:41:38,763 INFO L226 Difference]: Without dead ends: 498 [2022-11-23 13:41:38,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 13:41:38,764 INFO L413 NwaCegarLoop]: 327 mSDtfsCounter, 624 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 13:41:38,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [624 Valid, 366 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 13:41:38,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2022-11-23 13:41:38,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 464. [2022-11-23 13:41:38,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 386 states have (on average 1.3756476683937824) internal successors, (531), 391 states have internal predecessors, (531), 54 states have call successors, (54), 24 states have call predecessors, (54), 22 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2022-11-23 13:41:38,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 636 transitions. [2022-11-23 13:41:38,811 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 636 transitions. Word has length 47 [2022-11-23 13:41:38,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:41:38,811 INFO L495 AbstractCegarLoop]: Abstraction has 464 states and 636 transitions. [2022-11-23 13:41:38,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 13:41:38,811 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 636 transitions. [2022-11-23 13:41:38,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 13:41:38,812 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:41:38,813 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:41:38,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-23 13:41:38,813 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:41:38,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:41:38,813 INFO L85 PathProgramCache]: Analyzing trace with hash 651545773, now seen corresponding path program 1 times [2022-11-23 13:41:38,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:41:38,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680094905] [2022-11-23 13:41:38,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:38,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:41:38,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:38,996 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-23 13:41:38,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:41:38,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680094905] [2022-11-23 13:41:38,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680094905] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:41:38,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180623670] [2022-11-23 13:41:38,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:41:38,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:41:38,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:41:39,001 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:41:39,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 13:41:39,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:41:39,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 13:41:39,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:41:39,437 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:41:39,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 13:41:39,568 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-23 13:41:39,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180623670] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 13:41:39,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901691364] [2022-11-23 13:41:39,588 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2022-11-23 13:41:39,588 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 13:41:39,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 13:41:39,597 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 13:41:39,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 13:41:46,494 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 195 for LOIs [2022-11-23 13:41:46,526 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 210 for LOIs [2022-11-23 13:41:46,565 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 436 for LOIs [2022-11-23 13:41:53,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 13:42:09,952 WARN L233 SmtUtils]: Spent 8.57s on a formula simplification. DAG size of input: 425 DAG size of output: 323 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 13:42:19,043 WARN L233 SmtUtils]: Spent 8.38s on a formula simplification. DAG size of input: 436 DAG size of output: 337 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 13:42:28,811 WARN L233 SmtUtils]: Spent 8.56s on a formula simplification. DAG size of input: 443 DAG size of output: 341 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 13:42:36,694 WARN L233 SmtUtils]: Spent 7.66s on a formula simplification. DAG size of input: 459 DAG size of output: 414 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 13:42:44,947 WARN L233 SmtUtils]: Spent 7.77s on a formula simplification. DAG size of input: 463 DAG size of output: 416 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 13:42:57,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10466#(and (= ~E_12~0 2) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~T11_E~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t8_pc~0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_13~0 2) (= ~E_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~t13_st~0 0) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~E_10~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~T9_E~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t2_i~0 0) (= 0 ~t8_st~0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~E_11~0 2) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (<= ~p_num_write~0 1) (= ~m_i~0 0) (= ~t10_st~0 0) (= ~t10_pc~0 0) (= 0 ~t9_pc~0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~t11_pc~0 0) (<= 0 (+ ~q_buf_0~0 2147483648)) (= ~p_dw_pc~0 1) (= ~T12_E~0 2) (= ~t11_i~0 0) (= ~T13_E~0 2) (= ~q_write_ev~0 2) (= ~t12_pc~0 0) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~t12_i~0 0) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~t8_i~0 0) (= ~t13_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= 0 ~t9_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= ~p_last_write~0 2147483647) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= ~t12_st~0 0) (= 0 ~t4_pc~0) (= ~t13_pc~0 0) (= ~t11_st~0 0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~T8_E~0 2) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~E_9~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-11-23 13:42:57,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 13:42:57,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 13:42:57,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2022-11-23 13:42:57,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892261881] [2022-11-23 13:42:57,933 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 13:42:57,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 13:42:57,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:42:57,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 13:42:57,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 13:42:57,935 INFO L87 Difference]: Start difference. First operand 464 states and 636 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 13:42:58,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:42:58,383 INFO L93 Difference]: Finished difference Result 865 states and 1134 transitions. [2022-11-23 13:42:58,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 13:42:58,383 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2022-11-23 13:42:58,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:42:58,387 INFO L225 Difference]: With dead ends: 865 [2022-11-23 13:42:58,388 INFO L226 Difference]: Without dead ends: 862 [2022-11-23 13:42:58,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 64.1s TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 13:42:58,389 INFO L413 NwaCegarLoop]: 377 mSDtfsCounter, 515 mSDsluCounter, 679 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 515 SdHoareTripleChecker+Valid, 1056 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 13:42:58,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [515 Valid, 1056 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 13:42:58,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 862 states. [2022-11-23 13:42:58,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 862 to 663. [2022-11-23 13:42:58,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 663 states, 553 states have (on average 1.3417721518987342) internal successors, (742), 560 states have internal predecessors, (742), 73 states have call successors, (73), 37 states have call predecessors, (73), 35 states have return successors, (70), 66 states have call predecessors, (70), 70 states have call successors, (70) [2022-11-23 13:42:58,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 663 states to 663 states and 885 transitions. [2022-11-23 13:42:58,462 INFO L78 Accepts]: Start accepts. Automaton has 663 states and 885 transitions. Word has length 48 [2022-11-23 13:42:58,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:42:58,462 INFO L495 AbstractCegarLoop]: Abstraction has 663 states and 885 transitions. [2022-11-23 13:42:58,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 13:42:58,463 INFO L276 IsEmpty]: Start isEmpty. Operand 663 states and 885 transitions. [2022-11-23 13:42:58,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 13:42:58,465 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:42:58,465 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2022-11-23 13:42:58,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-23 13:42:58,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-23 13:42:58,683 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:42:58,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:42:58,684 INFO L85 PathProgramCache]: Analyzing trace with hash 1351947455, now seen corresponding path program 2 times [2022-11-23 13:42:58,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:42:58,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275019517] [2022-11-23 13:42:58,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:42:58,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:42:58,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:42:58,753 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-23 13:42:58,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:42:58,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275019517] [2022-11-23 13:42:58,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1275019517] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:42:58,754 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:42:58,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:42:58,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124148763] [2022-11-23 13:42:58,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:42:58,755 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:42:58,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:42:58,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:42:58,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:42:58,756 INFO L87 Difference]: Start difference. First operand 663 states and 885 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-23 13:42:58,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:42:58,934 INFO L93 Difference]: Finished difference Result 969 states and 1270 transitions. [2022-11-23 13:42:58,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:42:58,935 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2022-11-23 13:42:58,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:42:58,939 INFO L225 Difference]: With dead ends: 969 [2022-11-23 13:42:58,939 INFO L226 Difference]: Without dead ends: 607 [2022-11-23 13:42:58,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:42:58,943 INFO L413 NwaCegarLoop]: 339 mSDtfsCounter, 357 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:42:58,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [357 Valid, 382 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:42:58,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2022-11-23 13:42:59,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 604. [2022-11-23 13:42:59,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 604 states, 504 states have (on average 1.3333333333333333) internal successors, (672), 512 states have internal predecessors, (672), 67 states have call successors, (67), 33 states have call predecessors, (67), 31 states have return successors, (64), 59 states have call predecessors, (64), 64 states have call successors, (64) [2022-11-23 13:42:59,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 803 transitions. [2022-11-23 13:42:59,014 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 803 transitions. Word has length 61 [2022-11-23 13:42:59,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:42:59,015 INFO L495 AbstractCegarLoop]: Abstraction has 604 states and 803 transitions. [2022-11-23 13:42:59,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-23 13:42:59,015 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 803 transitions. [2022-11-23 13:42:59,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-23 13:42:59,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:42:59,017 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:42:59,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-23 13:42:59,018 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:42:59,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:42:59,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1863954412, now seen corresponding path program 1 times [2022-11-23 13:42:59,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:42:59,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987005621] [2022-11-23 13:42:59,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:42:59,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:42:59,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:42:59,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:42:59,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:42:59,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987005621] [2022-11-23 13:42:59,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987005621] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:42:59,158 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:42:59,158 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 13:42:59,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565422631] [2022-11-23 13:42:59,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:42:59,159 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:42:59,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:42:59,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:42:59,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:42:59,160 INFO L87 Difference]: Start difference. First operand 604 states and 803 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-23 13:42:59,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:42:59,622 INFO L93 Difference]: Finished difference Result 986 states and 1428 transitions. [2022-11-23 13:42:59,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:42:59,622 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 71 [2022-11-23 13:42:59,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:42:59,626 INFO L225 Difference]: With dead ends: 986 [2022-11-23 13:42:59,627 INFO L226 Difference]: Without dead ends: 789 [2022-11-23 13:42:59,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:42:59,629 INFO L413 NwaCegarLoop]: 545 mSDtfsCounter, 608 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 977 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 13:42:59,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [608 Valid, 977 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 13:42:59,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 789 states. [2022-11-23 13:42:59,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 789 to 788. [2022-11-23 13:42:59,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 788 states, 659 states have (on average 1.3748103186646434) internal successors, (906), 668 states have internal predecessors, (906), 90 states have call successors, (90), 39 states have call predecessors, (90), 37 states have return successors, (87), 81 states have call predecessors, (87), 87 states have call successors, (87) [2022-11-23 13:42:59,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 788 states to 788 states and 1083 transitions. [2022-11-23 13:42:59,714 INFO L78 Accepts]: Start accepts. Automaton has 788 states and 1083 transitions. Word has length 71 [2022-11-23 13:42:59,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:42:59,714 INFO L495 AbstractCegarLoop]: Abstraction has 788 states and 1083 transitions. [2022-11-23 13:42:59,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-23 13:42:59,715 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 1083 transitions. [2022-11-23 13:42:59,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-23 13:42:59,716 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:42:59,717 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2022-11-23 13:42:59,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-23 13:42:59,717 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:42:59,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:42:59,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1581527741, now seen corresponding path program 1 times [2022-11-23 13:42:59,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:42:59,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29721582] [2022-11-23 13:42:59,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:42:59,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:42:59,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:42:59,871 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 13:42:59,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:42:59,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29721582] [2022-11-23 13:42:59,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29721582] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:42:59,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667821999] [2022-11-23 13:42:59,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:42:59,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:42:59,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:42:59,874 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:42:59,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 13:43:00,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:00,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:00,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:00,075 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 13:43:00,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:00,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667821999] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:00,076 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:00,076 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-23 13:43:00,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107585427] [2022-11-23 13:43:00,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:00,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:00,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:00,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:00,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:00,079 INFO L87 Difference]: Start difference. First operand 788 states and 1083 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-23 13:43:00,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:00,242 INFO L93 Difference]: Finished difference Result 882 states and 1197 transitions. [2022-11-23 13:43:00,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:00,243 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2022-11-23 13:43:00,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:00,246 INFO L225 Difference]: With dead ends: 882 [2022-11-23 13:43:00,246 INFO L226 Difference]: Without dead ends: 387 [2022-11-23 13:43:00,248 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:00,248 INFO L413 NwaCegarLoop]: 330 mSDtfsCounter, 24 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:00,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 633 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:00,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2022-11-23 13:43:00,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2022-11-23 13:43:00,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 322 states have (on average 1.5248447204968945) internal successors, (491), 325 states have internal predecessors, (491), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2022-11-23 13:43:00,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 593 transitions. [2022-11-23 13:43:00,285 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 593 transitions. Word has length 73 [2022-11-23 13:43:00,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:00,285 INFO L495 AbstractCegarLoop]: Abstraction has 387 states and 593 transitions. [2022-11-23 13:43:00,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-23 13:43:00,286 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 593 transitions. [2022-11-23 13:43:00,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:00,294 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:00,295 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:00,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:00,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:00,501 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:00,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:00,502 INFO L85 PathProgramCache]: Analyzing trace with hash 566883990, now seen corresponding path program 1 times [2022-11-23 13:43:00,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:00,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106822814] [2022-11-23 13:43:00,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:00,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:00,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:00,696 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:00,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:00,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106822814] [2022-11-23 13:43:00,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106822814] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:00,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1780359414] [2022-11-23 13:43:00,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:00,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:00,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:00,699 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:00,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 13:43:00,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:00,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:00,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:01,069 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 13:43:01,069 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:01,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1780359414] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:01,070 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:01,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:01,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181304015] [2022-11-23 13:43:01,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:01,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:01,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:01,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:01,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:01,073 INFO L87 Difference]: Start difference. First operand 387 states and 593 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:01,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:01,293 INFO L93 Difference]: Finished difference Result 1142 states and 1782 transitions. [2022-11-23 13:43:01,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:01,294 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:01,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:01,298 INFO L225 Difference]: With dead ends: 1142 [2022-11-23 13:43:01,298 INFO L226 Difference]: Without dead ends: 761 [2022-11-23 13:43:01,300 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:01,301 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 266 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:01,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 566 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:01,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 761 states. [2022-11-23 13:43:01,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 761 to 755. [2022-11-23 13:43:01,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 634 states have (on average 1.523659305993691) internal successors, (966), 638 states have internal predecessors, (966), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2022-11-23 13:43:01,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 1156 transitions. [2022-11-23 13:43:01,366 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 1156 transitions. Word has length 144 [2022-11-23 13:43:01,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:01,366 INFO L495 AbstractCegarLoop]: Abstraction has 755 states and 1156 transitions. [2022-11-23 13:43:01,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:01,367 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 1156 transitions. [2022-11-23 13:43:01,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:01,371 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:01,372 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:01,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:01,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-23 13:43:01,580 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:01,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:01,580 INFO L85 PathProgramCache]: Analyzing trace with hash -419798316, now seen corresponding path program 1 times [2022-11-23 13:43:01,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:01,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081095244] [2022-11-23 13:43:01,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:01,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:01,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:01,762 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:01,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:01,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081095244] [2022-11-23 13:43:01,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081095244] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:01,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653953201] [2022-11-23 13:43:01,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:01,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:01,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:01,765 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:01,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 13:43:02,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:02,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 1119 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:02,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:02,104 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 13:43:02,104 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:02,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1653953201] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:02,105 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:02,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:02,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000196660] [2022-11-23 13:43:02,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:02,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:02,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:02,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:02,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:02,107 INFO L87 Difference]: Start difference. First operand 755 states and 1156 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:02,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:02,374 INFO L93 Difference]: Finished difference Result 2240 states and 3491 transitions. [2022-11-23 13:43:02,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:02,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:02,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:02,382 INFO L225 Difference]: With dead ends: 2240 [2022-11-23 13:43:02,382 INFO L226 Difference]: Without dead ends: 1491 [2022-11-23 13:43:02,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:02,387 INFO L413 NwaCegarLoop]: 307 mSDtfsCounter, 278 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:02,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [278 Valid, 554 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:02,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1491 states. [2022-11-23 13:43:02,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1491 to 1483. [2022-11-23 13:43:02,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1483 states, 1252 states have (on average 1.5207667731629393) internal successors, (1904), 1258 states have internal predecessors, (1904), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2022-11-23 13:43:02,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1483 states to 1483 states and 2266 transitions. [2022-11-23 13:43:02,515 INFO L78 Accepts]: Start accepts. Automaton has 1483 states and 2266 transitions. Word has length 144 [2022-11-23 13:43:02,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:02,515 INFO L495 AbstractCegarLoop]: Abstraction has 1483 states and 2266 transitions. [2022-11-23 13:43:02,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:02,516 INFO L276 IsEmpty]: Start isEmpty. Operand 1483 states and 2266 transitions. [2022-11-23 13:43:02,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:02,521 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:02,521 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:02,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:02,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 13:43:02,728 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:02,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:02,729 INFO L85 PathProgramCache]: Analyzing trace with hash 1856266770, now seen corresponding path program 1 times [2022-11-23 13:43:02,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:02,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288782644] [2022-11-23 13:43:02,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:02,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:02,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:02,905 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:02,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:02,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288782644] [2022-11-23 13:43:02,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288782644] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:02,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715896556] [2022-11-23 13:43:02,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:02,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:02,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:02,911 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:02,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 13:43:03,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:03,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:03,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:03,246 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-23 13:43:03,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:03,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715896556] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:03,246 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:03,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:03,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944822110] [2022-11-23 13:43:03,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:03,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:03,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:03,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:03,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:03,249 INFO L87 Difference]: Start difference. First operand 1483 states and 2266 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:03,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:03,630 INFO L93 Difference]: Finished difference Result 4412 states and 6859 transitions. [2022-11-23 13:43:03,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:03,631 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:03,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:03,645 INFO L225 Difference]: With dead ends: 4412 [2022-11-23 13:43:03,645 INFO L226 Difference]: Without dead ends: 2935 [2022-11-23 13:43:03,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:03,652 INFO L413 NwaCegarLoop]: 317 mSDtfsCounter, 281 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:03,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [281 Valid, 564 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:03,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2935 states. [2022-11-23 13:43:03,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2935 to 2923. [2022-11-23 13:43:03,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2923 states, 2476 states have (on average 1.5169628432956381) internal successors, (3756), 2486 states have internal predecessors, (3756), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2022-11-23 13:43:03,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2923 states to 2923 states and 4454 transitions. [2022-11-23 13:43:03,898 INFO L78 Accepts]: Start accepts. Automaton has 2923 states and 4454 transitions. Word has length 144 [2022-11-23 13:43:03,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:03,898 INFO L495 AbstractCegarLoop]: Abstraction has 2923 states and 4454 transitions. [2022-11-23 13:43:03,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:03,899 INFO L276 IsEmpty]: Start isEmpty. Operand 2923 states and 4454 transitions. [2022-11-23 13:43:03,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:03,907 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:03,907 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:03,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:04,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:04,114 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:04,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:04,115 INFO L85 PathProgramCache]: Analyzing trace with hash -832425452, now seen corresponding path program 1 times [2022-11-23 13:43:04,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:04,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048202004] [2022-11-23 13:43:04,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:04,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:04,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:04,359 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:04,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:04,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048202004] [2022-11-23 13:43:04,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048202004] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:04,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872186623] [2022-11-23 13:43:04,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:04,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:04,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:04,362 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:04,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 13:43:04,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:04,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 1107 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:04,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:04,728 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 13:43:04,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:04,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872186623] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:04,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:04,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:04,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482421885] [2022-11-23 13:43:04,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:04,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:04,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:04,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:04,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:04,731 INFO L87 Difference]: Start difference. First operand 2923 states and 4454 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:05,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:05,321 INFO L93 Difference]: Finished difference Result 8708 states and 13495 transitions. [2022-11-23 13:43:05,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:05,322 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:05,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:05,351 INFO L225 Difference]: With dead ends: 8708 [2022-11-23 13:43:05,351 INFO L226 Difference]: Without dead ends: 5791 [2022-11-23 13:43:05,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:05,362 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 254 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:05,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 525 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:05,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5791 states. [2022-11-23 13:43:05,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5791 to 5771. [2022-11-23 13:43:05,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5771 states, 4900 states have (on average 1.5126530612244897) internal successors, (7412), 4918 states have internal predecessors, (7412), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2022-11-23 13:43:05,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5771 states to 5771 states and 8766 transitions. [2022-11-23 13:43:05,939 INFO L78 Accepts]: Start accepts. Automaton has 5771 states and 8766 transitions. Word has length 144 [2022-11-23 13:43:05,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:05,939 INFO L495 AbstractCegarLoop]: Abstraction has 5771 states and 8766 transitions. [2022-11-23 13:43:05,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:05,940 INFO L276 IsEmpty]: Start isEmpty. Operand 5771 states and 8766 transitions. [2022-11-23 13:43:05,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:05,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:05,953 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:05,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:06,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-23 13:43:06,160 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:06,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:06,161 INFO L85 PathProgramCache]: Analyzing trace with hash 2106886994, now seen corresponding path program 1 times [2022-11-23 13:43:06,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:06,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592014864] [2022-11-23 13:43:06,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:06,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:06,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:06,335 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:06,336 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:06,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592014864] [2022-11-23 13:43:06,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592014864] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:06,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294988036] [2022-11-23 13:43:06,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:06,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:06,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:06,338 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:06,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 13:43:06,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:06,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 1101 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:06,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:06,661 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 13:43:06,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:06,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294988036] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:06,662 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:06,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:06,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507657211] [2022-11-23 13:43:06,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:06,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:06,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:06,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:06,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:06,664 INFO L87 Difference]: Start difference. First operand 5771 states and 8766 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:07,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:07,730 INFO L93 Difference]: Finished difference Result 17204 states and 26567 transitions. [2022-11-23 13:43:07,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:07,731 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:07,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:07,803 INFO L225 Difference]: With dead ends: 17204 [2022-11-23 13:43:07,803 INFO L226 Difference]: Without dead ends: 11439 [2022-11-23 13:43:07,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:07,827 INFO L413 NwaCegarLoop]: 315 mSDtfsCounter, 287 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:07,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 562 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:07,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11439 states. [2022-11-23 13:43:08,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11439 to 11403. [2022-11-23 13:43:09,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11403 states, 9700 states have (on average 1.508041237113402) internal successors, (14628), 9734 states have internal predecessors, (14628), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2022-11-23 13:43:09,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11403 states to 11403 states and 17262 transitions. [2022-11-23 13:43:09,076 INFO L78 Accepts]: Start accepts. Automaton has 11403 states and 17262 transitions. Word has length 144 [2022-11-23 13:43:09,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:09,077 INFO L495 AbstractCegarLoop]: Abstraction has 11403 states and 17262 transitions. [2022-11-23 13:43:09,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:09,078 INFO L276 IsEmpty]: Start isEmpty. Operand 11403 states and 17262 transitions. [2022-11-23 13:43:09,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:09,101 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:09,101 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:09,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:09,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 13:43:09,316 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:09,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:09,317 INFO L85 PathProgramCache]: Analyzing trace with hash -712846892, now seen corresponding path program 1 times [2022-11-23 13:43:09,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:09,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135617455] [2022-11-23 13:43:09,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:09,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:09,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:09,485 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:09,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:09,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135617455] [2022-11-23 13:43:09,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135617455] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:09,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948792607] [2022-11-23 13:43:09,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:09,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:09,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:09,488 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:09,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 13:43:09,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:09,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 1095 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:09,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:09,857 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 13:43:09,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:09,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948792607] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:09,858 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:09,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:09,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861723319] [2022-11-23 13:43:09,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:09,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:09,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:09,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:09,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:09,862 INFO L87 Difference]: Start difference. First operand 11403 states and 17262 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:11,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:11,555 INFO L93 Difference]: Finished difference Result 34004 states and 52311 transitions. [2022-11-23 13:43:11,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:11,555 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:11,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:11,641 INFO L225 Difference]: With dead ends: 34004 [2022-11-23 13:43:11,641 INFO L226 Difference]: Without dead ends: 22607 [2022-11-23 13:43:11,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:11,680 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 260 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:11,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 525 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:11,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22607 states. [2022-11-23 13:43:14,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22607 to 22539. [2022-11-23 13:43:14,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22539 states, 19204 states have (on average 1.5032284940637368) internal successors, (28868), 19270 states have internal predecessors, (28868), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2022-11-23 13:43:14,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22539 states to 22539 states and 33998 transitions. [2022-11-23 13:43:14,267 INFO L78 Accepts]: Start accepts. Automaton has 22539 states and 33998 transitions. Word has length 144 [2022-11-23 13:43:14,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:14,268 INFO L495 AbstractCegarLoop]: Abstraction has 22539 states and 33998 transitions. [2022-11-23 13:43:14,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:14,268 INFO L276 IsEmpty]: Start isEmpty. Operand 22539 states and 33998 transitions. [2022-11-23 13:43:14,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:14,309 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:14,310 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:14,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:14,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 13:43:14,516 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:14,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:14,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1315912558, now seen corresponding path program 1 times [2022-11-23 13:43:14,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:14,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884905080] [2022-11-23 13:43:14,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:14,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:14,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:14,687 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:43:14,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:14,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884905080] [2022-11-23 13:43:14,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884905080] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:43:14,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704146629] [2022-11-23 13:43:14,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:14,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:14,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:43:14,690 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:43:14,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 13:43:14,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:14,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 1089 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:43:14,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:43:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 13:43:15,037 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:43:15,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704146629] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:15,037 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:43:15,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:43:15,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890778450] [2022-11-23 13:43:15,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:15,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:43:15,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:15,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:43:15,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:15,039 INFO L87 Difference]: Start difference. First operand 22539 states and 33998 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:18,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:18,598 INFO L93 Difference]: Finished difference Result 67220 states and 102999 transitions. [2022-11-23 13:43:18,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:43:18,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2022-11-23 13:43:18,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:18,804 INFO L225 Difference]: With dead ends: 67220 [2022-11-23 13:43:18,805 INFO L226 Difference]: Without dead ends: 44687 [2022-11-23 13:43:18,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:18,874 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 272 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:18,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 525 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:43:18,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44687 states. [2022-11-23 13:43:22,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44687 to 44555. [2022-11-23 13:43:22,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44555 states, 38020 states have (on average 1.498264071541294) internal successors, (56964), 38150 states have internal predecessors, (56964), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2022-11-23 13:43:22,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44555 states to 44555 states and 66958 transitions. [2022-11-23 13:43:22,932 INFO L78 Accepts]: Start accepts. Automaton has 44555 states and 66958 transitions. Word has length 144 [2022-11-23 13:43:22,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:43:22,932 INFO L495 AbstractCegarLoop]: Abstraction has 44555 states and 66958 transitions. [2022-11-23 13:43:22,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 13:43:22,933 INFO L276 IsEmpty]: Start isEmpty. Operand 44555 states and 66958 transitions. [2022-11-23 13:43:23,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:43:23,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:43:23,030 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:43:23,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 13:43:23,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39a160ff-65c7-4477-98fe-b2fe7c1c2dc0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:43:23,239 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:43:23,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:43:23,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1014855088, now seen corresponding path program 1 times [2022-11-23 13:43:23,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:43:23,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215213536] [2022-11-23 13:43:23,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:43:23,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:43:23,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:43:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-23 13:43:24,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:43:24,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215213536] [2022-11-23 13:43:24,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215213536] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:43:24,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:43:24,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:43:24,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603469276] [2022-11-23 13:43:24,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:43:24,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:43:24,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:43:24,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:43:24,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:43:24,146 INFO L87 Difference]: Start difference. First operand 44555 states and 66958 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 13:43:32,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:43:32,467 INFO L93 Difference]: Finished difference Result 156435 states and 234773 transitions. [2022-11-23 13:43:32,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 13:43:32,468 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 144 [2022-11-23 13:43:32,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:43:33,490 INFO L225 Difference]: With dead ends: 156435 [2022-11-23 13:43:33,490 INFO L226 Difference]: Without dead ends: 111887 [2022-11-23 13:43:33,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-23 13:43:33,647 INFO L413 NwaCegarLoop]: 277 mSDtfsCounter, 1242 mSDsluCounter, 501 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1264 SdHoareTripleChecker+Valid, 778 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 13:43:33,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1264 Valid, 778 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 13:43:33,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111887 states.