./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9 --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 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f --- 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-6b4ec56 [2022-11-20 21:23:38,881 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 21:23:38,882 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 21:23:38,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 21:23:38,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 21:23:38,916 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 21:23:38,918 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 21:23:38,919 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 21:23:38,921 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 21:23:38,922 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 21:23:38,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 21:23:38,933 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 21:23:38,933 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 21:23:38,939 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 21:23:38,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 21:23:38,944 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 21:23:38,946 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 21:23:38,949 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 21:23:38,953 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 21:23:38,959 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 21:23:38,960 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 21:23:38,963 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 21:23:38,966 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 21:23:38,967 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 21:23:38,977 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 21:23:38,978 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 21:23:38,978 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 21:23:38,979 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 21:23:38,979 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 21:23:38,980 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 21:23:38,981 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 21:23:38,982 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 21:23:38,982 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 21:23:38,983 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 21:23:38,987 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 21:23:38,988 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 21:23:38,989 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 21:23:38,989 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 21:23:38,990 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 21:23:38,991 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 21:23:38,992 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 21:23:38,993 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 21:23:39,036 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 21:23:39,036 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 21:23:39,037 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 21:23:39,037 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 21:23:39,038 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 21:23:39,038 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 21:23:39,038 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 21:23:39,039 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 21:23:39,039 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 21:23:39,039 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 21:23:39,040 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 21:23:39,040 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 21:23:39,040 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 21:23:39,041 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 21:23:39,041 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 21:23:39,041 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 21:23:39,041 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 21:23:39,041 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 21:23:39,043 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 21:23:39,043 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 21:23:39,043 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 21:23:39,043 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 21:23:39,043 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 21:23:39,044 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 21:23:39,044 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 21:23:39,044 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 21:23:39,044 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 21:23:39,045 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 21:23:39,045 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 21:23:39,045 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 21:23:39,045 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 21:23:39,046 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 21:23:39,046 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:23:39,046 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 21:23:39,046 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 21:23:39,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 21:23:39,047 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 21:23:39,047 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 21:23:39,047 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 21:23:39,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 21:23:39,048 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 21:23:39,048 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_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f [2022-11-20 21:23:39,334 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 21:23:39,369 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 21:23:39,371 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 21:23:39,373 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 21:23:39,375 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 21:23:39,376 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2022-11-20 21:23:42,385 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 21:23:42,621 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 21:23:42,622 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2022-11-20 21:23:42,629 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/data/71b21785a/6742e882a1ab4cf49a2db86fecfe8c4f/FLAG12b91441c [2022-11-20 21:23:42,646 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/data/71b21785a/6742e882a1ab4cf49a2db86fecfe8c4f [2022-11-20 21:23:42,649 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 21:23:42,651 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 21:23:42,654 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 21:23:42,654 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 21:23:42,658 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 21:23:42,659 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,660 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4848fd27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42, skipping insertion in model container [2022-11-20 21:23:42,661 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,668 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 21:23:42,685 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 21:23:42,834 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_6f206dc7-0774-4744-ba2a-4482c64a9439/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2022-11-20 21:23:42,852 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:23:42,861 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 21:23:42,874 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_6f206dc7-0774-4744-ba2a-4482c64a9439/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2022-11-20 21:23:42,879 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:23:42,891 INFO L208 MainTranslator]: Completed translation [2022-11-20 21:23:42,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42 WrapperNode [2022-11-20 21:23:42,891 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 21:23:42,892 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 21:23:42,892 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 21:23:42,892 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 21:23:42,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,906 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,925 INFO L138 Inliner]: procedures = 20, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 46 [2022-11-20 21:23:42,925 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 21:23:42,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 21:23:42,926 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 21:23:42,926 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 21:23:42,936 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,936 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,937 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,938 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,941 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,944 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,946 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,946 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,948 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 21:23:42,949 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 21:23:42,949 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 21:23:42,949 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 21:23:42,950 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (1/1) ... [2022-11-20 21:23:42,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:23:42,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:42,997 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 21:23:43,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 21:23:43,045 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 21:23:43,046 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 21:23:43,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 21:23:43,046 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 21:23:43,046 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 21:23:43,046 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 21:23:43,127 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 21:23:43,130 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 21:23:43,363 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 21:23:43,434 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 21:23:43,435 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-20 21:23:43,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:23:43 BoogieIcfgContainer [2022-11-20 21:23:43,437 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 21:23:43,440 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 21:23:43,441 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 21:23:43,444 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 21:23:43,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 09:23:42" (1/3) ... [2022-11-20 21:23:43,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@653dbe6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:23:43, skipping insertion in model container [2022-11-20 21:23:43,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:23:42" (2/3) ... [2022-11-20 21:23:43,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@653dbe6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:23:43, skipping insertion in model container [2022-11-20 21:23:43,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:23:43" (3/3) ... [2022-11-20 21:23:43,447 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2022-11-20 21:23:43,468 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 21:23:43,468 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 21:23:43,521 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 21:23:43,528 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;@b47b473, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 21:23:43,529 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 21:23:43,533 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:23:43,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 21:23:43,542 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:43,543 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 21:23:43,543 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:43,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:43,549 INFO L85 PathProgramCache]: Analyzing trace with hash -1091749507, now seen corresponding path program 1 times [2022-11-20 21:23:43,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:43,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124510642] [2022-11-20 21:23:43,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:43,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:43,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:43,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:43,788 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:43,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124510642] [2022-11-20 21:23:43,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124510642] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:23:43,789 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:23:43,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 21:23:43,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809525567] [2022-11-20 21:23:43,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:23:43,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 21:23:43,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:43,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 21:23:43,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:23:43,829 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:23:43,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:43,920 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2022-11-20 21:23:43,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 21:23:43,936 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 21:23:43,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:43,944 INFO L225 Difference]: With dead ends: 37 [2022-11-20 21:23:43,945 INFO L226 Difference]: Without dead ends: 20 [2022-11-20 21:23:43,948 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 [2022-11-20 21:23:43,952 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:43,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 25 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:23:43,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-20 21:23:43,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2022-11-20 21:23:43,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 21:23:43,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-20 21:23:43,991 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2022-11-20 21:23:43,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:43,991 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-20 21:23:43,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:23:43,992 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-20 21:23:43,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 21:23:43,993 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:43,994 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:43,994 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 21:23:43,994 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:43,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:43,995 INFO L85 PathProgramCache]: Analyzing trace with hash -1655309817, now seen corresponding path program 1 times [2022-11-20 21:23:43,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:43,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183208436] [2022-11-20 21:23:43,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:43,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:44,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:44,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:44,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:44,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183208436] [2022-11-20 21:23:44,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183208436] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:23:44,093 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:23:44,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 21:23:44,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018876194] [2022-11-20 21:23:44,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:23:44,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 21:23:44,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:44,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 21:23:44,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:23:44,097 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:23:44,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:44,124 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2022-11-20 21:23:44,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 21:23:44,125 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 21:23:44,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:44,126 INFO L225 Difference]: With dead ends: 31 [2022-11-20 21:23:44,126 INFO L226 Difference]: Without dead ends: 18 [2022-11-20 21:23:44,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:23:44,128 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:44,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 21:23:44,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-20 21:23:44,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2022-11-20 21:23:44,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 21:23:44,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-20 21:23:44,134 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2022-11-20 21:23:44,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:44,135 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-20 21:23:44,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:23:44,135 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-20 21:23:44,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 21:23:44,136 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:44,136 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:44,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 21:23:44,137 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:44,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:44,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1647057710, now seen corresponding path program 1 times [2022-11-20 21:23:44,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:44,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205137137] [2022-11-20 21:23:44,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:44,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:44,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:44,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:44,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:44,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205137137] [2022-11-20 21:23:44,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205137137] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:23:44,520 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:23:44,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 21:23:44,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797668619] [2022-11-20 21:23:44,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:23:44,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 21:23:44,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:44,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 21:23:44,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 21:23:44,524 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:23:44,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:44,605 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-11-20 21:23:44,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 21:23:44,606 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 21:23:44,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:44,608 INFO L225 Difference]: With dead ends: 23 [2022-11-20 21:23:44,610 INFO L226 Difference]: Without dead ends: 21 [2022-11-20 21:23:44,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 21:23:44,613 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:44,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 34 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:23:44,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-20 21:23:44,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-11-20 21:23:44,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 21:23:44,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-20 21:23:44,637 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2022-11-20 21:23:44,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:44,637 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-20 21:23:44,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:23:44,638 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-20 21:23:44,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 21:23:44,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:44,640 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:44,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 21:23:44,641 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:44,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:44,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1577091667, now seen corresponding path program 1 times [2022-11-20 21:23:44,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:44,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041874871] [2022-11-20 21:23:44,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:44,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:44,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:44,803 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:44,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:44,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041874871] [2022-11-20 21:23:44,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041874871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:23:44,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714027681] [2022-11-20 21:23:44,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:44,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:44,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:44,819 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:23:44,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 21:23:44,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:44,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 21:23:44,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:23:44,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:44,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:23:45,033 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:23:45,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714027681] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:23:45,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78491921] [2022-11-20 21:23:45,062 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-20 21:23:45,063 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:23:45,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:23:45,075 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:23:45,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:23:46,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2022-11-20 21:23:46,531 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:23:47,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '326#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:23:47,043 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:23:47,043 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:23:47,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-20 21:23:47,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904345368] [2022-11-20 21:23:47,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:23:47,044 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 21:23:47,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:47,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 21:23:47,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-11-20 21:23:47,045 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 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) [2022-11-20 21:23:47,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:47,133 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2022-11-20 21:23:47,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 21:23:47,134 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 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 14 [2022-11-20 21:23:47,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:47,135 INFO L225 Difference]: With dead ends: 47 [2022-11-20 21:23:47,135 INFO L226 Difference]: Without dead ends: 29 [2022-11-20 21:23:47,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2022-11-20 21:23:47,137 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 5 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:47,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 56 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 21:23:47,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-20 21:23:47,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-20 21:23:47,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 21:23:47,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2022-11-20 21:23:47,149 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 14 [2022-11-20 21:23:47,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:47,150 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2022-11-20 21:23:47,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 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) [2022-11-20 21:23:47,150 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2022-11-20 21:23:47,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-20 21:23:47,151 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:47,152 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:47,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 21:23:47,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:47,359 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:47,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:47,360 INFO L85 PathProgramCache]: Analyzing trace with hash 1609317511, now seen corresponding path program 2 times [2022-11-20 21:23:47,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:47,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050380357] [2022-11-20 21:23:47,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:47,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:47,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:47,586 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-20 21:23:47,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:47,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050380357] [2022-11-20 21:23:47,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050380357] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:23:47,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368636990] [2022-11-20 21:23:47,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:23:47,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:47,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:47,589 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:23:47,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 21:23:47,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 21:23:47,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:23:47,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 21:23:47,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:23:48,088 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 21:23:48,088 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 21:23:48,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368636990] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:23:48,088 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 21:23:48,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2022-11-20 21:23:48,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049103116] [2022-11-20 21:23:48,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:23:48,089 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 21:23:48,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:48,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 21:23:48,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-20 21:23:48,090 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 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) [2022-11-20 21:23:48,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:48,192 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2022-11-20 21:23:48,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 21:23:48,193 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 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 35 [2022-11-20 21:23:48,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:48,194 INFO L225 Difference]: With dead ends: 35 [2022-11-20 21:23:48,194 INFO L226 Difference]: Without dead ends: 31 [2022-11-20 21:23:48,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-11-20 21:23:48,195 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:48,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 66 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 11 Unchecked, 0.1s Time] [2022-11-20 21:23:48,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-20 21:23:48,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-20 21:23:48,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 21:23:48,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2022-11-20 21:23:48,209 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 35 [2022-11-20 21:23:48,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:48,209 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2022-11-20 21:23:48,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 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) [2022-11-20 21:23:48,210 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2022-11-20 21:23:48,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-20 21:23:48,211 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:48,211 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:23:48,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 21:23:48,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:48,417 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:48,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:48,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1075068730, now seen corresponding path program 1 times [2022-11-20 21:23:48,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:48,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985290486] [2022-11-20 21:23:48,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:48,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:48,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:48,612 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-20 21:23:48,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:48,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985290486] [2022-11-20 21:23:48,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985290486] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:23:48,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598293904] [2022-11-20 21:23:48,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:48,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:48,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:48,615 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:23:48,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 21:23:48,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:48,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 21:23:48,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:23:48,766 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-20 21:23:48,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:23:48,951 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-20 21:23:48,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598293904] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:23:48,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [365166208] [2022-11-20 21:23:48,954 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:23:48,954 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:23:48,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:23:48,955 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:23:48,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:23:51,244 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 21:23:51,249 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:23:51,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '924#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:23:51,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:23:51,868 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:23:51,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2022-11-20 21:23:51,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303044520] [2022-11-20 21:23:51,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:23:51,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-20 21:23:51,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:51,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-20 21:23:51,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-20 21:23:51,870 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-20 21:23:52,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:52,665 INFO L93 Difference]: Finished difference Result 128 states and 169 transitions. [2022-11-20 21:23:52,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 21:23:52,666 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) Word has length 42 [2022-11-20 21:23:52,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:52,667 INFO L225 Difference]: With dead ends: 128 [2022-11-20 21:23:52,667 INFO L226 Difference]: Without dead ends: 99 [2022-11-20 21:23:52,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=329, Invalid=1563, Unknown=0, NotChecked=0, Total=1892 [2022-11-20 21:23:52,669 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 94 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:52,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 220 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 21:23:52,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-20 21:23:52,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2022-11-20 21:23:52,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 63 states have internal predecessors, (68), 25 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-20 21:23:52,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 117 transitions. [2022-11-20 21:23:52,719 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 117 transitions. Word has length 42 [2022-11-20 21:23:52,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:52,720 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 117 transitions. [2022-11-20 21:23:52,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-20 21:23:52,720 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 117 transitions. [2022-11-20 21:23:52,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-20 21:23:52,734 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:52,734 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 20, 20, 20, 20, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-20 21:23:52,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 21:23:52,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-20 21:23:52,941 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:23:52,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:23:52,941 INFO L85 PathProgramCache]: Analyzing trace with hash -142712643, now seen corresponding path program 2 times [2022-11-20 21:23:52,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:23:52,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261530951] [2022-11-20 21:23:52,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:23:52,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:23:53,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:23:53,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 310 proven. 35 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2022-11-20 21:23:53,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:23:53,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261530951] [2022-11-20 21:23:53,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261530951] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:23:53,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716825486] [2022-11-20 21:23:53,497 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:23:53,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:23:53,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:23:53,503 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:23:53,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 21:23:55,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-20 21:23:55,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:23:55,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 21:23:55,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:23:55,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 406 proven. 35 refuted. 0 times theorem prover too weak. 1389 trivial. 0 not checked. [2022-11-20 21:23:55,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:23:55,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 316 proven. 35 refuted. 0 times theorem prover too weak. 1479 trivial. 0 not checked. [2022-11-20 21:23:55,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716825486] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:23:55,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3739191] [2022-11-20 21:23:55,826 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:23:55,826 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:23:55,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:23:55,827 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:23:55,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:23:57,829 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 21:23:57,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:23:58,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2403#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:23:58,463 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:23:58,463 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:23:58,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2022-11-20 21:23:58,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375204520] [2022-11-20 21:23:58,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:23:58,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 21:23:58,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:23:58,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 21:23:58,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2022-11-20 21:23:58,466 INFO L87 Difference]: Start difference. First operand 91 states and 117 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-20 21:23:59,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:23:59,742 INFO L93 Difference]: Finished difference Result 248 states and 350 transitions. [2022-11-20 21:23:59,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 21:23:59,743 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) Word has length 178 [2022-11-20 21:23:59,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:23:59,745 INFO L225 Difference]: With dead ends: 248 [2022-11-20 21:23:59,745 INFO L226 Difference]: Without dead ends: 175 [2022-11-20 21:23:59,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 518 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=215, Invalid=715, Unknown=0, NotChecked=0, Total=930 [2022-11-20 21:23:59,747 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 22 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 21:23:59,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 117 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 21:23:59,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-20 21:23:59,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2022-11-20 21:23:59,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 119 states have (on average 1.0420168067226891) internal successors, (124), 119 states have internal predecessors, (124), 53 states have call successors, (53), 3 states have call predecessors, (53), 2 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-20 21:23:59,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 229 transitions. [2022-11-20 21:23:59,811 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 229 transitions. Word has length 178 [2022-11-20 21:23:59,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:23:59,812 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 229 transitions. [2022-11-20 21:23:59,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-20 21:23:59,812 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 229 transitions. [2022-11-20 21:23:59,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2022-11-20 21:23:59,817 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:23:59,818 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 48, 48, 48, 48, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-20 21:23:59,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-20 21:24:00,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:00,024 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:24:00,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:24:00,024 INFO L85 PathProgramCache]: Analyzing trace with hash 20085617, now seen corresponding path program 3 times [2022-11-20 21:24:00,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:24:00,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498488933] [2022-11-20 21:24:00,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:24:00,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:24:00,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:24:01,706 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 1479 proven. 210 refuted. 0 times theorem prover too weak. 7323 trivial. 0 not checked. [2022-11-20 21:24:01,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:24:01,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498488933] [2022-11-20 21:24:01,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498488933] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:24:01,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148765792] [2022-11-20 21:24:01,708 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:24:01,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:01,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:24:01,711 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:24:01,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 21:24:01,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:24:01,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:24:01,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 21:24:01,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:24:02,445 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 104 proven. 2890 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2022-11-20 21:24:02,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:24:03,375 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 208 proven. 2786 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2022-11-20 21:24:03,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148765792] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:24:03,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [183945372] [2022-11-20 21:24:03,379 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:24:03,379 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:24:03,380 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:24:03,381 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:24:03,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:24:04,938 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 21:24:04,944 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:24:10,217 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5392#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:24:10,217 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:24:10,217 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:24:10,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2022-11-20 21:24:10,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128698511] [2022-11-20 21:24:10,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:24:10,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 21:24:10,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:24:10,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 21:24:10,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1576, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 21:24:10,221 INFO L87 Difference]: Start difference. First operand 175 states and 229 transitions. Second operand has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) [2022-11-20 21:24:24,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:24:24,004 INFO L93 Difference]: Finished difference Result 601 states and 816 transitions. [2022-11-20 21:24:24,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-11-20 21:24:24,005 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) Word has length 374 [2022-11-20 21:24:24,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:24:24,008 INFO L225 Difference]: With dead ends: 601 [2022-11-20 21:24:24,008 INFO L226 Difference]: Without dead ends: 465 [2022-11-20 21:24:24,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1269 GetRequests, 995 SyntacticMatches, 100 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13203 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=3448, Invalid=27352, Unknown=0, NotChecked=0, Total=30800 [2022-11-20 21:24:24,023 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 551 mSDsluCounter, 1167 mSDsCounter, 0 mSdLazyCounter, 5134 mSolverCounterSat, 609 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 555 SdHoareTripleChecker+Valid, 1388 SdHoareTripleChecker+Invalid, 5743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 609 IncrementalHoareTripleChecker+Valid, 5134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-20 21:24:24,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [555 Valid, 1388 Invalid, 5743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [609 Valid, 5134 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-20 21:24:24,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-11-20 21:24:24,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 445. [2022-11-20 21:24:24,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 301 states have (on average 1.0365448504983388) internal successors, (312), 301 states have internal predecessors, (312), 141 states have call successors, (141), 3 states have call predecessors, (141), 2 states have return successors, (140), 140 states have call predecessors, (140), 140 states have call successors, (140) [2022-11-20 21:24:24,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 593 transitions. [2022-11-20 21:24:24,181 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 593 transitions. Word has length 374 [2022-11-20 21:24:24,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:24:24,182 INFO L495 AbstractCegarLoop]: Abstraction has 445 states and 593 transitions. [2022-11-20 21:24:24,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) [2022-11-20 21:24:24,182 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 593 transitions. [2022-11-20 21:24:24,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 997 [2022-11-20 21:24:24,217 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:24:24,218 INFO L195 NwaCegarLoop]: trace histogram [141, 140, 140, 130, 130, 130, 130, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2022-11-20 21:24:24,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 21:24:24,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:24,425 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:24:24,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:24:24,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1374958435, now seen corresponding path program 4 times [2022-11-20 21:24:24,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:24:24,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744015892] [2022-11-20 21:24:24,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:24:24,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:24:25,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:24:28,681 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 5096 proven. 247 refuted. 0 times theorem prover too weak. 60502 trivial. 0 not checked. [2022-11-20 21:24:28,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:24:28,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744015892] [2022-11-20 21:24:28,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744015892] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:24:28,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449696040] [2022-11-20 21:24:28,682 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 21:24:28,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:24:28,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:24:28,687 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:24:28,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 21:24:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:24:29,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 2143 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-20 21:24:29,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:24:30,539 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 280 proven. 24413 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2022-11-20 21:24:30,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:24:33,053 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 373 proven. 24320 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2022-11-20 21:24:33,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449696040] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:24:33,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1519806742] [2022-11-20 21:24:33,056 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:24:33,056 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:24:33,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:24:33,057 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:24:33,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:24:34,603 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 21:24:34,608 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:24:54,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13429#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:24:54,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:24:54,275 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:24:54,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2022-11-20 21:24:54,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839931418] [2022-11-20 21:24:54,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:24:54,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-20 21:24:54,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:24:54,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-20 21:24:54,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=689, Invalid=3867, Unknown=0, NotChecked=0, Total=4556 [2022-11-20 21:24:54,281 INFO L87 Difference]: Start difference. First operand 445 states and 593 transitions. Second operand has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) [2022-11-20 21:28:42,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:28:42,138 INFO L93 Difference]: Finished difference Result 1474 states and 2014 transitions. [2022-11-20 21:28:42,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 342 states. [2022-11-20 21:28:42,140 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) Word has length 996 [2022-11-20 21:28:42,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:28:42,146 INFO L225 Difference]: With dead ends: 1474 [2022-11-20 21:28:42,146 INFO L226 Difference]: Without dead ends: 1071 [2022-11-20 21:28:42,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3320 GetRequests, 2667 SyntacticMatches, 270 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70838 ImplicationChecksByTransitivity, 233.6s TimeCoverageRelationStatistics Valid=15794, Invalid=132044, Unknown=2, NotChecked=0, Total=147840 [2022-11-20 21:28:42,164 INFO L413 NwaCegarLoop]: 512 mSDtfsCounter, 1400 mSDsluCounter, 5780 mSDsCounter, 0 mSdLazyCounter, 18775 mSolverCounterSat, 1523 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1404 SdHoareTripleChecker+Valid, 6292 SdHoareTripleChecker+Invalid, 20298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1523 IncrementalHoareTripleChecker+Valid, 18775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.7s IncrementalHoareTripleChecker+Time [2022-11-20 21:28:42,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1404 Valid, 6292 Invalid, 20298 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1523 Valid, 18775 Invalid, 0 Unknown, 0 Unchecked, 14.7s Time] [2022-11-20 21:28:42,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1071 states. [2022-11-20 21:28:42,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1071 to 1027. [2022-11-20 21:28:42,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1027 states, 693 states have (on average 1.0331890331890332) internal successors, (716), 693 states have internal predecessors, (716), 331 states have call successors, (331), 3 states have call predecessors, (331), 2 states have return successors, (330), 330 states have call predecessors, (330), 330 states have call successors, (330) [2022-11-20 21:28:42,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1027 states to 1027 states and 1377 transitions. [2022-11-20 21:28:42,393 INFO L78 Accepts]: Start accepts. Automaton has 1027 states and 1377 transitions. Word has length 996 [2022-11-20 21:28:42,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:28:42,393 INFO L495 AbstractCegarLoop]: Abstraction has 1027 states and 1377 transitions. [2022-11-20 21:28:42,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) [2022-11-20 21:28:42,394 INFO L276 IsEmpty]: Start isEmpty. Operand 1027 states and 1377 transitions. [2022-11-20 21:28:42,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2339 [2022-11-20 21:28:42,642 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:28:42,642 INFO L195 NwaCegarLoop]: trace histogram [331, 330, 330, 308, 308, 308, 308, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-20 21:28:42,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 21:28:42,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:28:42,843 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:28:42,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:28:42,844 INFO L85 PathProgramCache]: Analyzing trace with hash 797960315, now seen corresponding path program 5 times [2022-11-20 21:28:42,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:28:42,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645014120] [2022-11-20 21:28:42,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:28:42,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:28:46,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:28:53,839 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 13639 proven. 287 refuted. 0 times theorem prover too weak. 353430 trivial. 0 not checked. [2022-11-20 21:28:53,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:28:53,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645014120] [2022-11-20 21:28:53,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645014120] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:28:53,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16820099] [2022-11-20 21:28:53,840 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:28:53,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:28:53,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:28:53,842 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:28:53,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 21:29:15,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-20 21:29:15,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:29:15,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-20 21:29:15,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:29:15,689 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14995 proven. 287 refuted. 0 times theorem prover too weak. 352074 trivial. 0 not checked. [2022-11-20 21:29:15,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:29:18,525 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14668 proven. 287 refuted. 0 times theorem prover too weak. 352401 trivial. 0 not checked. [2022-11-20 21:29:18,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16820099] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:29:18,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1701939840] [2022-11-20 21:29:18,533 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:29:18,534 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:29:18,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:29:18,534 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:29:18,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:29:20,430 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 21:29:20,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:29:21,687 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32294#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:29:21,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:29:21,688 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:29:21,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 21] total 37 [2022-11-20 21:29:21,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547508739] [2022-11-20 21:29:21,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:29:21,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-20 21:29:21,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:29:21,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-20 21:29:21,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=1657, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 21:29:21,696 INFO L87 Difference]: Start difference. First operand 1027 states and 1377 transitions. Second operand has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) [2022-11-20 21:29:33,244 WARN L233 SmtUtils]: Spent 8.99s on a formula simplification. DAG size of input: 97 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:29:48,703 WARN L233 SmtUtils]: Spent 11.99s on a formula simplification. DAG size of input: 91 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:30:15,287 WARN L233 SmtUtils]: Spent 5.30s on a formula simplification. DAG size of input: 73 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:30:25,972 WARN L233 SmtUtils]: Spent 6.51s on a formula simplification. DAG size of input: 67 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:31:14,688 WARN L233 SmtUtils]: Spent 30.66s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:31:47,430 WARN L233 SmtUtils]: Spent 25.40s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:32:16,695 WARN L233 SmtUtils]: Spent 23.85s on a formula simplification that was a NOOP. DAG size: 91 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 21:32:17,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:32:17,620 INFO L93 Difference]: Finished difference Result 3087 states and 4498 transitions. [2022-11-20 21:32:17,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-20 21:32:17,620 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) Word has length 2338 [2022-11-20 21:32:17,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:32:17,631 INFO L225 Difference]: With dead ends: 3087 [2022-11-20 21:32:17,631 INFO L226 Difference]: Without dead ends: 2083 [2022-11-20 21:32:17,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7048 GetRequests, 6986 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 174.0s TimeCoverageRelationStatistics Valid=981, Invalid=2921, Unknown=4, NotChecked=0, Total=3906 [2022-11-20 21:32:17,636 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 118 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 1235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:32:17,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 314 Invalid, 1235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-11-20 21:32:17,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2022-11-20 21:32:18,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2083. [2022-11-20 21:32:18,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2083 states, 1397 states have (on average 1.0164638511095203) internal successors, (1420), 1397 states have internal predecessors, (1420), 683 states have call successors, (683), 3 states have call predecessors, (683), 2 states have return successors, (682), 682 states have call predecessors, (682), 682 states have call successors, (682) [2022-11-20 21:32:18,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2083 states to 2083 states and 2785 transitions. [2022-11-20 21:32:18,158 INFO L78 Accepts]: Start accepts. Automaton has 2083 states and 2785 transitions. Word has length 2338 [2022-11-20 21:32:18,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:32:18,159 INFO L495 AbstractCegarLoop]: Abstraction has 2083 states and 2785 transitions. [2022-11-20 21:32:18,159 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) [2022-11-20 21:32:18,160 INFO L276 IsEmpty]: Start isEmpty. Operand 2083 states and 2785 transitions. [2022-11-20 21:32:18,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4803 [2022-11-20 21:32:18,311 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:32:18,312 INFO L195 NwaCegarLoop]: trace histogram [683, 682, 682, 660, 660, 660, 660, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-20 21:32:18,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 21:32:18,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-20 21:32:18,513 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:32:18,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:32:18,514 INFO L85 PathProgramCache]: Analyzing trace with hash -1629040005, now seen corresponding path program 6 times [2022-11-20 21:32:18,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:32:18,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368392914] [2022-11-20 21:32:18,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:32:18,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:32:29,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:33:03,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 59367 proven. 1335 refuted. 0 times theorem prover too weak. 1537422 trivial. 0 not checked. [2022-11-20 21:33:03,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:33:03,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368392914] [2022-11-20 21:33:03,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368392914] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:33:03,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580321774] [2022-11-20 21:33:03,349 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:33:03,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:33:03,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:33:03,350 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:33:03,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f206dc7-0774-4744-ba2a-4482c64a9439/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 21:33:05,650 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:33:05,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:33:05,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 10273 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-20 21:33:05,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:33:11,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 1364 proven. 639757 refuted. 0 times theorem prover too weak. 957003 trivial. 0 not checked. [2022-11-20 21:33:11,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:33:22,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 1900 proven. 639221 refuted. 0 times theorem prover too weak. 957003 trivial. 0 not checked. [2022-11-20 21:33:22,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580321774] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:33:22,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1193099002] [2022-11-20 21:33:22,321 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:33:22,321 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:33:22,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:33:22,322 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:33:22,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:33:24,071 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 21:33:24,075 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:33:26,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69900#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:33:26,033 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:33:26,033 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:33:26,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 48, 48] total 125 [2022-11-20 21:33:26,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190216568] [2022-11-20 21:33:26,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:33:26,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-20 21:33:26,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:33:26,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-20 21:33:26,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2520, Invalid=15302, Unknown=0, NotChecked=0, Total=17822 [2022-11-20 21:33:26,051 INFO L87 Difference]: Start difference. First operand 2083 states and 2785 transitions. Second operand has 125 states, 125 states have (on average 3.112) internal successors, (389), 125 states have internal predecessors, (389), 119 states have call successors, (165), 2 states have call predecessors, (165), 1 states have return successors, (164), 119 states have call predecessors, (164), 119 states have call successors, (164) [2022-11-20 21:35:52,449 WARN L233 SmtUtils]: Spent 6.32s on a formula simplification. DAG size of input: 97 DAG size of output: 14 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)