./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2dec1b2e3c1461164aa09bac8cca047a14ba0fda75d53737804411255b62653a --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:06:13,421 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:06:13,424 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:06:13,460 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:06:13,460 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:06:13,462 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:06:13,463 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:06:13,465 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:06:13,467 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:06:13,468 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:06:13,470 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:06:13,471 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:06:13,472 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:06:13,473 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:06:13,474 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:06:13,476 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:06:13,477 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:06:13,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:06:13,480 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:06:13,482 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:06:13,484 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:06:13,486 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:06:13,487 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:06:13,488 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:06:13,492 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:06:13,492 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:06:13,493 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:06:13,494 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:06:13,494 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:06:13,495 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:06:13,496 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:06:13,497 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:06:13,498 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:06:13,498 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:06:13,500 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:06:13,500 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:06:13,501 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:06:13,501 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:06:13,502 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:06:13,503 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:06:13,504 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:06:13,505 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:06:13,531 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:06:13,532 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:06:13,532 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:06:13,533 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:06:13,533 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:06:13,534 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:06:13,534 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:06:13,534 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:06:13,534 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:06:13,534 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:06:13,535 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:06:13,535 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:06:13,535 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:06:13,535 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:06:13,536 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:06:13,536 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:06:13,536 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:06:13,536 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:06:13,539 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:06:13,539 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:06:13,540 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:06:13,540 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:06:13,540 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:06:13,540 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:06:13,540 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:06:13,540 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:06:13,541 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:06:13,541 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:06:13,541 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:06:13,541 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:06:13,541 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:06:13,542 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:06:13,542 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:06:13,542 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:06:13,542 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:06:13,542 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:06:13,543 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:06:13,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:06:13,543 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:06:13,543 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:06:13,543 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:06:13,543 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2dec1b2e3c1461164aa09bac8cca047a14ba0fda75d53737804411255b62653a [2021-11-25 19:06:13,846 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:06:13,881 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:06:13,884 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:06:13,885 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:06:13,886 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:06:13,887 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound20.c [2021-11-25 19:06:13,971 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/data/752fd3db2/5f1ea7fada864801a7f78a6cb278eba9/FLAG561f133c2 [2021-11-25 19:06:14,494 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:06:14,495 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound20.c [2021-11-25 19:06:14,508 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/data/752fd3db2/5f1ea7fada864801a7f78a6cb278eba9/FLAG561f133c2 [2021-11-25 19:06:14,873 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/data/752fd3db2/5f1ea7fada864801a7f78a6cb278eba9 [2021-11-25 19:06:14,876 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:06:14,877 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:06:14,891 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:06:14,891 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:06:14,894 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:06:14,895 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:06:14" (1/1) ... [2021-11-25 19:06:14,896 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b31f210 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:14, skipping insertion in model container [2021-11-25 19:06:14,897 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:06:14" (1/1) ... [2021-11-25 19:06:14,905 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:06:14,926 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:06:15,089 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound20.c[535,548] [2021-11-25 19:06:15,109 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:06:15,117 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:06:15,129 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound20.c[535,548] [2021-11-25 19:06:15,139 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:06:15,152 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:06:15,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15 WrapperNode [2021-11-25 19:06:15,153 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:06:15,154 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:06:15,154 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:06:15,154 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:06:15,162 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,168 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,188 INFO L137 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2021-11-25 19:06:15,188 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:06:15,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:06:15,189 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:06:15,189 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:06:15,197 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,197 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,199 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,199 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,203 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,207 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,209 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,210 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:06:15,211 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:06:15,212 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:06:15,212 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:06:15,213 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (1/1) ... [2021-11-25 19:06:15,224 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:06:15,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:15,265 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:06:15,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:06:15,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:06:15,314 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 19:06:15,314 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 19:06:15,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:06:15,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:06:15,315 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:06:15,315 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 19:06:15,315 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 19:06:15,380 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:06:15,381 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:06:15,517 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:06:15,535 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:06:15,536 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 19:06:15,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:06:15 BoogieIcfgContainer [2021-11-25 19:06:15,538 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:06:15,540 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:06:15,540 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:06:15,546 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:06:15,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:06:14" (1/3) ... [2021-11-25 19:06:15,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f2e923a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:06:15, skipping insertion in model container [2021-11-25 19:06:15,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:06:15" (2/3) ... [2021-11-25 19:06:15,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f2e923a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:06:15, skipping insertion in model container [2021-11-25 19:06:15,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:06:15" (3/3) ... [2021-11-25 19:06:15,551 INFO L111 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound20.c [2021-11-25 19:06:15,557 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:06:15,557 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:06:15,610 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:06:15,618 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:06:15,618 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:06:15,635 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:06:15,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:06:15,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:15,641 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:15,642 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:15,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:15,648 INFO L85 PathProgramCache]: Analyzing trace with hash -438729207, now seen corresponding path program 1 times [2021-11-25 19:06:15,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:15,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139446560] [2021-11-25 19:06:15,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:15,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:15,734 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:06:15,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [875805929] [2021-11-25 19:06:15,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:15,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:15,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:15,737 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:15,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:06:15,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:15,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 19:06:15,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:15,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:15,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:06:15,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:15,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139446560] [2021-11-25 19:06:15,910 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:06:15,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875805929] [2021-11-25 19:06:15,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875805929] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:15,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:15,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:06:15,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407397146] [2021-11-25 19:06:15,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:15,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:06:15,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:15,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:06:15,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:06:15,974 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 19:06:16,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:16,004 INFO L93 Difference]: Finished difference Result 48 states and 77 transitions. [2021-11-25 19:06:16,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:06:16,006 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-25 19:06:16,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:16,014 INFO L225 Difference]: With dead ends: 48 [2021-11-25 19:06:16,014 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 19:06:16,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:06:16,022 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:16,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:06:16,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 19:06:16,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 19:06:16,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 17 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) [2021-11-25 19:06:16,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2021-11-25 19:06:16,076 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 13 [2021-11-25 19:06:16,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:16,077 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2021-11-25 19:06:16,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 19:06:16,078 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2021-11-25 19:06:16,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:06:16,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:16,079 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:16,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:16,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:16,282 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:16,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:16,283 INFO L85 PathProgramCache]: Analyzing trace with hash 2071776720, now seen corresponding path program 1 times [2021-11-25 19:06:16,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:16,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994786487] [2021-11-25 19:06:16,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:16,303 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:06:16,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [979695447] [2021-11-25 19:06:16,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:16,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:16,328 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:16,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:06:16,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:16,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:06:16,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:16,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:16,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:06:16,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:16,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994786487] [2021-11-25 19:06:16,456 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:06:16,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979695447] [2021-11-25 19:06:16,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979695447] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:16,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:16,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:06:16,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410371408] [2021-11-25 19:06:16,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:16,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:06:16,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:16,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:06:16,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:16,459 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 19:06:16,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:16,482 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-11-25 19:06:16,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:06:16,482 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-25 19:06:16,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:16,483 INFO L225 Difference]: With dead ends: 34 [2021-11-25 19:06:16,483 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 19:06:16,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:06:16,485 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:16,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 82 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:06:16,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 19:06:16,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-25 19:06:16,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 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) [2021-11-25 19:06:16,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2021-11-25 19:06:16,493 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2021-11-25 19:06:16,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:16,494 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2021-11-25 19:06:16,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 19:06:16,494 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2021-11-25 19:06:16,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:06:16,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:16,495 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:16,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:16,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:16,710 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:16,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:16,710 INFO L85 PathProgramCache]: Analyzing trace with hash 2073445016, now seen corresponding path program 1 times [2021-11-25 19:06:16,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:16,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650772201] [2021-11-25 19:06:16,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:16,725 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:06:16,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1961406063] [2021-11-25 19:06:16,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:16,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:16,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:16,730 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:16,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:06:16,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:16,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:06:16,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:16,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:16,950 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:06:16,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:16,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650772201] [2021-11-25 19:06:16,951 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:06:16,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961406063] [2021-11-25 19:06:16,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961406063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:16,951 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:06:16,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:06:16,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129382254] [2021-11-25 19:06:16,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:16,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:06:16,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:16,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:06:16,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:06:16,953 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 19:06:29,312 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 12.31s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:06:31,752 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:06:31,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:31,766 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2021-11-25 19:06:31,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:06:31,767 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-25 19:06:31,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:31,768 INFO L225 Difference]: With dead ends: 46 [2021-11-25 19:06:31,769 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 19:06:31,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:06:31,770 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 16 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:31,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 94 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 2 Unknown, 0 Unchecked, 14.8s Time] [2021-11-25 19:06:31,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 19:06:31,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-11-25 19:06:31,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:06:31,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2021-11-25 19:06:31,786 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 14 [2021-11-25 19:06:31,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:31,787 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2021-11-25 19:06:31,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 19:06:31,790 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2021-11-25 19:06:31,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 19:06:31,792 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:31,792 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:31,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:32,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:32,015 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:32,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:32,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1668710205, now seen corresponding path program 1 times [2021-11-25 19:06:32,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:32,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852102749] [2021-11-25 19:06:32,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:32,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:32,025 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:06:32,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [865226595] [2021-11-25 19:06:32,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:32,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:32,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:32,027 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:32,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:06:32,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:32,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:06:32,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:32,235 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:32,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:32,490 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:32,490 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:32,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852102749] [2021-11-25 19:06:32,490 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:06:32,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865226595] [2021-11-25 19:06:32,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865226595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:32,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1351339309] [2021-11-25 19:06:32,516 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 19:06:32,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:32,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:32,528 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:32,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:33,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 142 for LOIs [2021-11-25 19:06:33,540 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:06:33,612 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:40,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1351339309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:40,917 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:06:40,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 8] total 21 [2021-11-25 19:06:40,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022391545] [2021-11-25 19:06:40,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:40,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:06:40,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:40,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:06:40,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:06:40,919 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:06:41,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:41,034 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2021-11-25 19:06:41,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:06:41,035 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2021-11-25 19:06:41,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:41,036 INFO L225 Difference]: With dead ends: 57 [2021-11-25 19:06:41,036 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 19:06:41,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:06:41,038 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:41,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 110 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 55 Unchecked, 0.1s Time] [2021-11-25 19:06:41,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 19:06:41,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-11-25 19:06:41,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:06:41,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2021-11-25 19:06:41,054 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 20 [2021-11-25 19:06:41,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:41,054 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2021-11-25 19:06:41,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:06:41,055 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2021-11-25 19:06:41,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:06:41,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:41,056 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:41,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:41,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:41,269 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:41,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:41,270 INFO L85 PathProgramCache]: Analyzing trace with hash 1338452232, now seen corresponding path program 1 times [2021-11-25 19:06:41,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:41,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510160419] [2021-11-25 19:06:41,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:41,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:41,280 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:06:41,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1652970728] [2021-11-25 19:06:41,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:41,284 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:41,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:41,285 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:41,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:06:41,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:41,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:06:41,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:41,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:41,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:41,536 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:06:41,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:41,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510160419] [2021-11-25 19:06:41,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:06:41,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652970728] [2021-11-25 19:06:41,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652970728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:41,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [868750438] [2021-11-25 19:06:41,541 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 19:06:41,541 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:41,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:41,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:41,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:42,040 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 160 for LOIs [2021-11-25 19:06:42,351 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:06:42,404 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:06:54,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [868750438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:06:54,831 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:06:54,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7, 6] total 22 [2021-11-25 19:06:54,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011455009] [2021-11-25 19:06:54,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:06:54,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:06:54,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:06:54,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:06:54,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:06:54,834 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:06:55,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:06:55,213 INFO L93 Difference]: Finished difference Result 91 states and 126 transitions. [2021-11-25 19:06:55,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:06:55,214 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-11-25 19:06:55,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:06:55,217 INFO L225 Difference]: With dead ends: 91 [2021-11-25 19:06:55,217 INFO L226 Difference]: Without dead ends: 56 [2021-11-25 19:06:55,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:06:55,219 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 4 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:06:55,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 169 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 82 Invalid, 0 Unknown, 51 Unchecked, 0.4s Time] [2021-11-25 19:06:55,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-25 19:06:55,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-25 19:06:55,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 41 states have internal predecessors, (52), 11 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:06:55,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2021-11-25 19:06:55,231 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 22 [2021-11-25 19:06:55,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:06:55,232 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2021-11-25 19:06:55,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:06:55,232 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2021-11-25 19:06:55,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 19:06:55,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:06:55,234 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:06:55,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:06:55,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:55,439 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:06:55,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:06:55,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1808313670, now seen corresponding path program 1 times [2021-11-25 19:06:55,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:06:55,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506160019] [2021-11-25 19:06:55,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:55,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:06:55,449 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:06:55,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1646876196] [2021-11-25 19:06:55,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:55,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:55,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:55,450 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:55,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:06:55,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:55,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:06:55,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:55,717 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:06:55,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:55,887 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 19:06:55,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:06:55,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506160019] [2021-11-25 19:06:55,891 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:06:55,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646876196] [2021-11-25 19:06:55,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646876196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:55,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [847293019] [2021-11-25 19:06:55,896 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-25 19:06:55,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:06:55,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:06:55,896 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:06:55,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:06:57,716 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 129 for LOIs [2021-11-25 19:06:57,960 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:06:58,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:09,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1287#(and (<= 2 ~counter~0) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:07:09,417 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:09,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:07:09,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-11-25 19:07:09,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595274876] [2021-11-25 19:07:09,417 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:09,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:07:09,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:09,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:07:09,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2021-11-25 19:07:09,419 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:07:09,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:09,625 INFO L93 Difference]: Finished difference Result 88 states and 122 transitions. [2021-11-25 19:07:09,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:07:09,626 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2021-11-25 19:07:09,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:09,628 INFO L225 Difference]: With dead ends: 88 [2021-11-25 19:07:09,628 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 19:07:09,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=110, Invalid=702, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:07:09,629 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 79 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:09,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 162 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:07:09,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 19:07:09,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 58. [2021-11-25 19:07:09,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:07:09,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2021-11-25 19:07:09,644 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 30 [2021-11-25 19:07:09,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:09,644 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2021-11-25 19:07:09,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:07:09,645 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2021-11-25 19:07:09,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:07:09,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:09,646 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:09,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:09,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:07:09,848 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:09,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:09,849 INFO L85 PathProgramCache]: Analyzing trace with hash -2135719167, now seen corresponding path program 1 times [2021-11-25 19:07:09,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:09,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587595901] [2021-11-25 19:07:09,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:09,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:09,881 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:07:09,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2036075615] [2021-11-25 19:07:09,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:09,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:09,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:09,885 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:09,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:07:09,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:09,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:07:09,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:10,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:07:10,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:10,103 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:07:10,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:10,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587595901] [2021-11-25 19:07:10,103 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:07:10,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036075615] [2021-11-25 19:07:10,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036075615] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:07:10,104 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:07:10,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2021-11-25 19:07:10,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927986989] [2021-11-25 19:07:10,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:10,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:07:10,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:10,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:07:10,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:07:10,106 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:07:10,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:10,145 INFO L93 Difference]: Finished difference Result 99 states and 132 transitions. [2021-11-25 19:07:10,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:07:10,146 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-11-25 19:07:10,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:10,147 INFO L225 Difference]: With dead ends: 99 [2021-11-25 19:07:10,147 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 19:07:10,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:07:10,149 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 16 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:10,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 109 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:07:10,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 19:07:10,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-11-25 19:07:10,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 states have internal predecessors, (57), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:07:10,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2021-11-25 19:07:10,162 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 32 [2021-11-25 19:07:10,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:10,162 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2021-11-25 19:07:10,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 19:07:10,163 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2021-11-25 19:07:10,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 19:07:10,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:10,164 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:10,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:10,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:10,380 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:10,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:10,382 INFO L85 PathProgramCache]: Analyzing trace with hash -301470394, now seen corresponding path program 1 times [2021-11-25 19:07:10,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:10,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591188515] [2021-11-25 19:07:10,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:10,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:10,429 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:07:10,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1113662673] [2021-11-25 19:07:10,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:10,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:10,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:10,433 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:10,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:07:10,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:10,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:07:10,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:10,574 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:07:10,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:10,672 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:07:10,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:10,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591188515] [2021-11-25 19:07:10,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:07:10,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113662673] [2021-11-25 19:07:10,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113662673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:10,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [856421722] [2021-11-25 19:07:10,678 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 19:07:10,678 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:10,679 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:10,679 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:10,679 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:07:14,872 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2021-11-25 19:07:14,878 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:07:14,931 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:32,206 WARN L227 SmtUtils]: Spent 6.54s on a formula simplification. DAG size of input: 59 DAG size of output: 55 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:07:32,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2136#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:32,307 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:32,307 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:07:32,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-25 19:07:32,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33593430] [2021-11-25 19:07:32,307 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:32,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:07:32,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:32,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:07:32,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:07:32,309 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 19:07:32,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:32,489 INFO L93 Difference]: Finished difference Result 167 states and 219 transitions. [2021-11-25 19:07:32,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:07:32,490 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 34 [2021-11-25 19:07:32,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:32,492 INFO L225 Difference]: With dead ends: 167 [2021-11-25 19:07:32,492 INFO L226 Difference]: Without dead ends: 130 [2021-11-25 19:07:32,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 19:07:32,494 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 70 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:32,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 210 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:07:32,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-25 19:07:32,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 116. [2021-11-25 19:07:32,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 85 states have (on average 1.2941176470588236) internal successors, (110), 86 states have internal predecessors, (110), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 19:07:32,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 149 transitions. [2021-11-25 19:07:32,515 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 149 transitions. Word has length 34 [2021-11-25 19:07:32,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:32,516 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 149 transitions. [2021-11-25 19:07:32,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 19:07:32,516 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 149 transitions. [2021-11-25 19:07:32,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 19:07:32,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:32,518 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:32,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:32,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:32,735 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:32,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:32,736 INFO L85 PathProgramCache]: Analyzing trace with hash 753982024, now seen corresponding path program 1 times [2021-11-25 19:07:32,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:32,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778065723] [2021-11-25 19:07:32,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:32,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:32,742 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:07:32,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1474672713] [2021-11-25 19:07:32,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:32,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:32,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:32,754 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:32,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:07:32,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:32,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:07:32,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:32,901 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 19:07:32,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:07:32,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:32,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778065723] [2021-11-25 19:07:32,901 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:07:32,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474672713] [2021-11-25 19:07:32,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474672713] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:07:32,902 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:07:32,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:07:32,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912044941] [2021-11-25 19:07:32,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:07:32,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:07:32,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:32,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:07:32,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:32,908 INFO L87 Difference]: Start difference. First operand 116 states and 149 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:07:32,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:32,959 INFO L93 Difference]: Finished difference Result 171 states and 228 transitions. [2021-11-25 19:07:32,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:07:32,959 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-11-25 19:07:32,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:32,961 INFO L225 Difference]: With dead ends: 171 [2021-11-25 19:07:32,961 INFO L226 Difference]: Without dead ends: 116 [2021-11-25 19:07:32,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:07:32,962 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 23 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:32,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 83 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:07:32,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-25 19:07:32,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 114. [2021-11-25 19:07:32,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 84 states have (on average 1.2738095238095237) internal successors, (107), 85 states have internal predecessors, (107), 21 states have call successors, (21), 9 states have call predecessors, (21), 8 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 19:07:32,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 148 transitions. [2021-11-25 19:07:32,980 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 148 transitions. Word has length 38 [2021-11-25 19:07:32,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:32,981 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 148 transitions. [2021-11-25 19:07:32,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:07:32,981 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 148 transitions. [2021-11-25 19:07:32,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 19:07:32,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:32,983 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:33,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:33,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 19:07:33,199 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:33,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:33,200 INFO L85 PathProgramCache]: Analyzing trace with hash 419809677, now seen corresponding path program 1 times [2021-11-25 19:07:33,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:33,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058396077] [2021-11-25 19:07:33,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:33,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:33,206 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:07:33,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [795763968] [2021-11-25 19:07:33,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:33,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:33,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:33,212 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:33,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:07:33,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:33,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:07:33,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:33,366 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:07:33,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:33,482 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 19:07:33,482 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:33,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058396077] [2021-11-25 19:07:33,482 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:07:33,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795763968] [2021-11-25 19:07:33,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795763968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:33,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1795857934] [2021-11-25 19:07:33,485 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:07:33,485 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:33,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:33,486 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:33,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:07:36,556 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 97 for LOIs [2021-11-25 19:07:36,691 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:07:36,729 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:07:53,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3310#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:07:53,662 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:07:53,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:07:53,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2021-11-25 19:07:53,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497804104] [2021-11-25 19:07:53,663 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:53,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:07:53,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:07:53,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:07:53,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=799, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:07:53,665 INFO L87 Difference]: Start difference. First operand 114 states and 148 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-25 19:07:53,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:07:53,899 INFO L93 Difference]: Finished difference Result 234 states and 314 transitions. [2021-11-25 19:07:53,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:07:53,900 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 40 [2021-11-25 19:07:53,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:07:53,902 INFO L225 Difference]: With dead ends: 234 [2021-11-25 19:07:53,902 INFO L226 Difference]: Without dead ends: 179 [2021-11-25 19:07:53,903 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 19:07:53,904 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 96 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:07:53,904 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 259 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:07:53,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-25 19:07:53,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 160. [2021-11-25 19:07:53,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 119 states have (on average 1.2773109243697478) internal successors, (152), 120 states have internal predecessors, (152), 30 states have call successors, (30), 11 states have call predecessors, (30), 10 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-25 19:07:53,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 211 transitions. [2021-11-25 19:07:53,925 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 211 transitions. Word has length 40 [2021-11-25 19:07:53,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:07:53,926 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 211 transitions. [2021-11-25 19:07:53,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-25 19:07:53,926 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 211 transitions. [2021-11-25 19:07:53,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 19:07:53,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:07:53,928 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:07:53,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:07:54,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 19:07:54,135 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:07:54,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:07:54,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1579218988, now seen corresponding path program 1 times [2021-11-25 19:07:54,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:07:54,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340523182] [2021-11-25 19:07:54,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:54,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:07:54,142 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:07:54,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1218347090] [2021-11-25 19:07:54,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:07:54,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:07:54,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:07:54,143 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:07:54,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:07:54,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:54,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:07:54,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:07:54,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:54,402 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 19:07:54,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:07:54,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340523182] [2021-11-25 19:07:54,403 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:07:54,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218347090] [2021-11-25 19:07:54,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218347090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:54,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [426997393] [2021-11-25 19:07:54,406 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:07:54,406 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:07:54,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:07:54,407 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:07:54,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:08:02,195 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 119 for LOIs [2021-11-25 19:08:02,207 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:08:02,242 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:08:22,770 WARN L227 SmtUtils]: Spent 6.00s on a formula simplification. DAG size of input: 116 DAG size of output: 103 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:08:29,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4167#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:08:29,724 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:08:29,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:08:29,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-25 19:08:29,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340281662] [2021-11-25 19:08:29,724 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:08:29,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:08:29,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:08:29,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:08:29,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:08:29,726 INFO L87 Difference]: Start difference. First operand 160 states and 211 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-25 19:08:30,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:08:30,038 INFO L93 Difference]: Finished difference Result 256 states and 336 transitions. [2021-11-25 19:08:30,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 19:08:30,038 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2021-11-25 19:08:30,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:08:30,041 INFO L225 Difference]: With dead ends: 256 [2021-11-25 19:08:30,041 INFO L226 Difference]: Without dead ends: 251 [2021-11-25 19:08:30,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 27.6s TimeCoverageRelationStatistics Valid=248, Invalid=1312, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 19:08:30,043 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 208 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:08:30,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 295 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:08:30,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-25 19:08:30,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 216. [2021-11-25 19:08:30,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 160 states have (on average 1.28125) internal successors, (205), 165 states have internal predecessors, (205), 43 states have call successors, (43), 13 states have call predecessors, (43), 12 states have return successors, (42), 37 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-25 19:08:30,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 290 transitions. [2021-11-25 19:08:30,067 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 290 transitions. Word has length 46 [2021-11-25 19:08:30,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:08:30,068 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 290 transitions. [2021-11-25 19:08:30,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-25 19:08:30,068 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 290 transitions. [2021-11-25 19:08:30,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:08:30,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:08:30,071 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:08:30,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:08:30,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:08:30,287 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:08:30,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:08:30,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1252121023, now seen corresponding path program 1 times [2021-11-25 19:08:30,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:08:30,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011583257] [2021-11-25 19:08:30,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:08:30,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:08:30,294 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:08:30,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [209270116] [2021-11-25 19:08:30,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:08:30,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:08:30,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:08:30,304 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:08:30,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:08:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:08:30,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:08:30,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:08:30,597 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:08:30,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:08:31,044 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:08:31,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:08:31,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011583257] [2021-11-25 19:08:31,044 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:08:31,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209270116] [2021-11-25 19:08:31,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209270116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:08:31,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1227362312] [2021-11-25 19:08:31,048 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:08:31,048 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:08:31,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:08:31,049 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:08:31,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:08:38,859 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 125 for LOIs [2021-11-25 19:08:38,871 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:08:38,903 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:08:57,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5171#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:08:57,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:08:57,689 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:08:57,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-11-25 19:08:57,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377548534] [2021-11-25 19:08:57,689 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:08:57,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:08:57,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:08:57,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:08:57,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:08:57,690 INFO L87 Difference]: Start difference. First operand 216 states and 290 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 19:08:59,705 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:09:01,709 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:09:03,803 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:09:04,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:09:04,204 INFO L93 Difference]: Finished difference Result 312 states and 426 transitions. [2021-11-25 19:09:04,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:09:04,204 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2021-11-25 19:09:04,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:09:04,207 INFO L225 Difference]: With dead ends: 312 [2021-11-25 19:09:04,207 INFO L226 Difference]: Without dead ends: 222 [2021-11-25 19:09:04,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 120 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:09:04,209 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 55 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 26 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:09:04,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 262 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 198 Invalid, 3 Unknown, 0 Unchecked, 6.4s Time] [2021-11-25 19:09:04,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-25 19:09:04,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 204. [2021-11-25 19:09:04,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 40 states have call successors, (40), 13 states have call predecessors, (40), 12 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-25 19:09:04,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 264 transitions. [2021-11-25 19:09:04,235 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 264 transitions. Word has length 52 [2021-11-25 19:09:04,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:09:04,235 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 264 transitions. [2021-11-25 19:09:04,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 19:09:04,236 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 264 transitions. [2021-11-25 19:09:04,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 19:09:04,239 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:09:04,239 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:09:04,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-25 19:09:04,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:09:04,455 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:09:04,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:09:04,456 INFO L85 PathProgramCache]: Analyzing trace with hash -703296414, now seen corresponding path program 1 times [2021-11-25 19:09:04,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:09:04,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95074564] [2021-11-25 19:09:04,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:04,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:09:04,463 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:09:04,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2022990019] [2021-11-25 19:09:04,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:04,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:09:04,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:09:04,467 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:09:04,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:09:04,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:09:04,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:09:04,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:09:04,649 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-25 19:09:04,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:09:04,795 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-25 19:09:04,795 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:09:04,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95074564] [2021-11-25 19:09:04,796 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:09:04,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022990019] [2021-11-25 19:09:04,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022990019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:09:04,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330595138] [2021-11-25 19:09:04,798 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:09:04,798 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:09:04,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:09:04,799 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:09:04,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:09:09,437 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-25 19:09:09,448 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:09:09,484 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:09:13,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6407#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:09:13,133 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:09:13,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:09:13,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-11-25 19:09:13,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42765968] [2021-11-25 19:09:13,133 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:09:13,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:09:13,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:09:13,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:09:13,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-11-25 19:09:13,135 INFO L87 Difference]: Start difference. First operand 204 states and 264 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:09:13,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:09:13,201 INFO L93 Difference]: Finished difference Result 496 states and 679 transitions. [2021-11-25 19:09:13,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:09:13,202 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 82 [2021-11-25 19:09:13,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:09:13,205 INFO L225 Difference]: With dead ends: 496 [2021-11-25 19:09:13,205 INFO L226 Difference]: Without dead ends: 360 [2021-11-25 19:09:13,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-11-25 19:09:13,207 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 16 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:09:13,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 143 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:09:13,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-11-25 19:09:13,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 349. [2021-11-25 19:09:13,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 262 states have (on average 1.2633587786259541) internal successors, (331), 268 states have internal predecessors, (331), 74 states have call successors, (74), 13 states have call predecessors, (74), 12 states have return successors, (73), 67 states have call predecessors, (73), 73 states have call successors, (73) [2021-11-25 19:09:13,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 478 transitions. [2021-11-25 19:09:13,248 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 478 transitions. Word has length 82 [2021-11-25 19:09:13,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:09:13,249 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 478 transitions. [2021-11-25 19:09:13,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:09:13,249 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 478 transitions. [2021-11-25 19:09:13,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 19:09:13,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:09:13,252 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:09:13,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:09:13,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 19:09:13,467 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:09:13,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:09:13,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1378770924, now seen corresponding path program 2 times [2021-11-25 19:09:13,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:09:13,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547966826] [2021-11-25 19:09:13,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:13,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:09:13,474 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:09:13,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1759347423] [2021-11-25 19:09:13,474 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:09:13,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:09:13,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:09:13,475 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:09:13,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:09:13,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:09:13,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:09:13,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:09:13,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:09:13,683 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-25 19:09:13,683 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:09:13,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:09:13,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547966826] [2021-11-25 19:09:13,684 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:09:13,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759347423] [2021-11-25 19:09:13,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759347423] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:09:13,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:09:13,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:09:13,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621937043] [2021-11-25 19:09:13,684 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:09:13,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:09:13,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:09:13,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:09:13,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:09:13,685 INFO L87 Difference]: Start difference. First operand 349 states and 478 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:09:13,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:09:13,749 INFO L93 Difference]: Finished difference Result 595 states and 830 transitions. [2021-11-25 19:09:13,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:09:13,750 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 82 [2021-11-25 19:09:13,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:09:13,753 INFO L225 Difference]: With dead ends: 595 [2021-11-25 19:09:13,753 INFO L226 Difference]: Without dead ends: 446 [2021-11-25 19:09:13,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:09:13,754 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 15 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:09:13,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 133 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:09:13,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-11-25 19:09:13,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 379. [2021-11-25 19:09:13,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 287 states have (on average 1.2439024390243902) internal successors, (357), 293 states have internal predecessors, (357), 78 states have call successors, (78), 14 states have call predecessors, (78), 13 states have return successors, (77), 71 states have call predecessors, (77), 77 states have call successors, (77) [2021-11-25 19:09:13,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 512 transitions. [2021-11-25 19:09:13,815 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 512 transitions. Word has length 82 [2021-11-25 19:09:13,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:09:13,816 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 512 transitions. [2021-11-25 19:09:13,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:09:13,816 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 512 transitions. [2021-11-25 19:09:13,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 19:09:13,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:09:13,819 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:09:13,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 19:09:14,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 19:09:14,043 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:09:14,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:09:14,044 INFO L85 PathProgramCache]: Analyzing trace with hash -760314426, now seen corresponding path program 3 times [2021-11-25 19:09:14,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:09:14,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402186239] [2021-11-25 19:09:14,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:14,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:09:14,051 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:09:14,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [257348814] [2021-11-25 19:09:14,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:09:14,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:09:14,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:09:14,062 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:09:14,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 19:09:14,134 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:09:14,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:09:14,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 19:09:14,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:09:14,323 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 152 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:09:14,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:09:14,574 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-25 19:09:14,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:09:14,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402186239] [2021-11-25 19:09:14,575 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:09:14,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257348814] [2021-11-25 19:09:14,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257348814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:09:14,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1740141835] [2021-11-25 19:09:14,577 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:09:14,578 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:09:14,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:09:14,578 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:09:14,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:09:18,490 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-25 19:09:18,506 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:09:18,543 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:09:20,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9740#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:09:20,904 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:09:20,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:09:20,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2021-11-25 19:09:20,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818047954] [2021-11-25 19:09:20,904 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:09:20,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:09:20,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:09:20,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:09:20,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1274, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 19:09:20,906 INFO L87 Difference]: Start difference. First operand 379 states and 512 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-25 19:09:21,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:09:21,758 INFO L93 Difference]: Finished difference Result 1155 states and 1659 transitions. [2021-11-25 19:09:21,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-25 19:09:21,760 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) Word has length 82 [2021-11-25 19:09:21,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:09:21,769 INFO L225 Difference]: With dead ends: 1155 [2021-11-25 19:09:21,770 INFO L226 Difference]: Without dead ends: 1104 [2021-11-25 19:09:21,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 201 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1237 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=678, Invalid=2514, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 19:09:21,773 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 545 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 545 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:09:21,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [545 Valid, 393 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:09:21,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1104 states. [2021-11-25 19:09:21,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1104 to 1044. [2021-11-25 19:09:21,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1044 states, 788 states have (on average 1.2550761421319796) internal successors, (989), 797 states have internal predecessors, (989), 234 states have call successors, (234), 22 states have call predecessors, (234), 21 states have return successors, (233), 224 states have call predecessors, (233), 233 states have call successors, (233) [2021-11-25 19:09:21,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1044 states to 1044 states and 1456 transitions. [2021-11-25 19:09:21,944 INFO L78 Accepts]: Start accepts. Automaton has 1044 states and 1456 transitions. Word has length 82 [2021-11-25 19:09:21,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:09:21,945 INFO L470 AbstractCegarLoop]: Abstraction has 1044 states and 1456 transitions. [2021-11-25 19:09:21,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-25 19:09:21,946 INFO L276 IsEmpty]: Start isEmpty. Operand 1044 states and 1456 transitions. [2021-11-25 19:09:21,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-25 19:09:21,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:09:21,949 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:09:21,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:09:22,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:09:22,163 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:09:22,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:09:22,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1887960563, now seen corresponding path program 1 times [2021-11-25 19:09:22,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:09:22,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206508223] [2021-11-25 19:09:22,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:22,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:09:22,174 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:09:22,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [529879703] [2021-11-25 19:09:22,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:22,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:09:22,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:09:22,176 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:09:22,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:09:22,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:09:22,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:09:22,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:09:22,540 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:09:22,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:09:22,850 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2021-11-25 19:09:22,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:09:22,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206508223] [2021-11-25 19:09:22,850 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:09:22,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529879703] [2021-11-25 19:09:22,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529879703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:09:22,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802182188] [2021-11-25 19:09:22,853 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:09:22,853 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:09:22,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:09:22,854 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:09:22,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:09:30,610 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 124 for LOIs [2021-11-25 19:09:31,765 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:09:31,812 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:09:49,017 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13459#(and (<= 2 ~counter~0) (<= ~counter~0 23) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:09:49,017 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:09:49,017 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:09:49,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2021-11-25 19:09:49,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879957636] [2021-11-25 19:09:49,017 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:09:49,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 19:09:49,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:09:49,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 19:09:49,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=1484, Unknown=1, NotChecked=0, Total=1892 [2021-11-25 19:09:49,019 INFO L87 Difference]: Start difference. First operand 1044 states and 1456 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-25 19:09:50,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:09:50,037 INFO L93 Difference]: Finished difference Result 1522 states and 2110 transitions. [2021-11-25 19:09:50,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 19:09:50,038 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 88 [2021-11-25 19:09:50,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:09:50,045 INFO L225 Difference]: With dead ends: 1522 [2021-11-25 19:09:50,046 INFO L226 Difference]: Without dead ends: 824 [2021-11-25 19:09:50,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1326 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=755, Invalid=2904, Unknown=1, NotChecked=0, Total=3660 [2021-11-25 19:09:50,051 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 583 mSDsluCounter, 413 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 362 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 362 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:09:50,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [583 Valid, 489 Invalid, 681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [362 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:09:50,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 824 states. [2021-11-25 19:09:50,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 824 to 768. [2021-11-25 19:09:50,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 768 states, 576 states have (on average 1.2065972222222223) internal successors, (695), 581 states have internal predecessors, (695), 168 states have call successors, (168), 24 states have call predecessors, (168), 23 states have return successors, (167), 162 states have call predecessors, (167), 167 states have call successors, (167) [2021-11-25 19:09:50,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 1030 transitions. [2021-11-25 19:09:50,149 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 1030 transitions. Word has length 88 [2021-11-25 19:09:50,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:09:50,150 INFO L470 AbstractCegarLoop]: Abstraction has 768 states and 1030 transitions. [2021-11-25 19:09:50,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-25 19:09:50,151 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 1030 transitions. [2021-11-25 19:09:50,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 19:09:50,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:09:50,154 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:09:50,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:09:50,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:09:50,375 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:09:50,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:09:50,375 INFO L85 PathProgramCache]: Analyzing trace with hash -890970028, now seen corresponding path program 1 times [2021-11-25 19:09:50,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:09:50,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386631623] [2021-11-25 19:09:50,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:50,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:09:50,385 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:09:50,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [596849041] [2021-11-25 19:09:50,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:09:50,386 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:09:50,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:09:50,387 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:09:50,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 19:09:50,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:09:50,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 19:09:50,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:09:50,729 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:09:50,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:09:51,103 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-25 19:09:51,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:09:51,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386631623] [2021-11-25 19:09:51,104 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:09:51,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596849041] [2021-11-25 19:09:51,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596849041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:09:51,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331390138] [2021-11-25 19:09:51,106 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:09:51,106 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:09:51,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:09:51,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:09:51,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:09:57,397 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 127 for LOIs [2021-11-25 19:09:58,235 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:09:58,269 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:10:07,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17323#(and (<= 0 |#NULL.base|) (<= ~counter~0 22) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:10:07,647 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:10:07,647 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:10:07,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-11-25 19:10:07,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933885062] [2021-11-25 19:10:07,648 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:10:07,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 19:10:07,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:10:07,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 19:10:07,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=1404, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 19:10:07,650 INFO L87 Difference]: Start difference. First operand 768 states and 1030 transitions. Second operand has 24 states, 24 states have (on average 4.416666666666667) internal successors, (106), 24 states have internal predecessors, (106), 21 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 20 states have call predecessors, (24), 20 states have call successors, (24) [2021-11-25 19:10:08,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:10:08,612 INFO L93 Difference]: Finished difference Result 786 states and 1049 transitions. [2021-11-25 19:10:08,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 19:10:08,613 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.416666666666667) internal successors, (106), 24 states have internal predecessors, (106), 21 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 20 states have call predecessors, (24), 20 states have call successors, (24) Word has length 94 [2021-11-25 19:10:08,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:10:08,619 INFO L225 Difference]: With dead ends: 786 [2021-11-25 19:10:08,619 INFO L226 Difference]: Without dead ends: 781 [2021-11-25 19:10:08,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 232 SyntacticMatches, 7 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=717, Invalid=2705, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:10:08,622 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 474 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:10:08,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [474 Valid, 397 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [289 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:10:08,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2021-11-25 19:10:08,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 773. [2021-11-25 19:10:08,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 581 states have (on average 1.1738382099827882) internal successors, (682), 585 states have internal predecessors, (682), 168 states have call successors, (168), 24 states have call predecessors, (168), 23 states have return successors, (167), 163 states have call predecessors, (167), 167 states have call successors, (167) [2021-11-25 19:10:08,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 1017 transitions. [2021-11-25 19:10:08,717 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 1017 transitions. Word has length 94 [2021-11-25 19:10:08,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:10:08,717 INFO L470 AbstractCegarLoop]: Abstraction has 773 states and 1017 transitions. [2021-11-25 19:10:08,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.416666666666667) internal successors, (106), 24 states have internal predecessors, (106), 21 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 20 states have call predecessors, (24), 20 states have call successors, (24) [2021-11-25 19:10:08,718 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 1017 transitions. [2021-11-25 19:10:08,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 19:10:08,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:10:08,725 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 9, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:10:08,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:10:08,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:10:08,951 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:10:08,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:10:08,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1363472298, now seen corresponding path program 4 times [2021-11-25 19:10:08,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:10:08,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794671204] [2021-11-25 19:10:08,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:10:08,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:10:08,967 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:10:08,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [723356762] [2021-11-25 19:10:08,967 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:10:08,968 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:10:08,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:10:08,969 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:10:08,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 19:10:09,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:10:09,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:10:09,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:10:09,352 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 556 proven. 0 refuted. 0 times theorem prover too weak. 430 trivial. 0 not checked. [2021-11-25 19:10:09,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:10:09,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:10:09,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794671204] [2021-11-25 19:10:09,353 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:10:09,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723356762] [2021-11-25 19:10:09,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723356762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:10:09,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:10:09,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:10:09,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022787848] [2021-11-25 19:10:09,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:10:09,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:10:09,355 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:10:09,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:10:09,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:10:09,356 INFO L87 Difference]: Start difference. First operand 773 states and 1017 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:10:09,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:10:09,443 INFO L93 Difference]: Finished difference Result 1293 states and 1703 transitions. [2021-11-25 19:10:09,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:10:09,444 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 170 [2021-11-25 19:10:09,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:10:09,451 INFO L225 Difference]: With dead ends: 1293 [2021-11-25 19:10:09,452 INFO L226 Difference]: Without dead ends: 813 [2021-11-25 19:10:09,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:10:09,455 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 3 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:10:09,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 70 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:10:09,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 813 states. [2021-11-25 19:10:09,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 813 to 743. [2021-11-25 19:10:09,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 743 states, 560 states have (on average 1.1607142857142858) internal successors, (650), 566 states have internal predecessors, (650), 159 states have call successors, (159), 24 states have call predecessors, (159), 23 states have return successors, (158), 152 states have call predecessors, (158), 158 states have call successors, (158) [2021-11-25 19:10:09,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 743 states to 743 states and 967 transitions. [2021-11-25 19:10:09,544 INFO L78 Accepts]: Start accepts. Automaton has 743 states and 967 transitions. Word has length 170 [2021-11-25 19:10:09,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:10:09,544 INFO L470 AbstractCegarLoop]: Abstraction has 743 states and 967 transitions. [2021-11-25 19:10:09,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:10:09,545 INFO L276 IsEmpty]: Start isEmpty. Operand 743 states and 967 transitions. [2021-11-25 19:10:09,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 19:10:09,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:10:09,551 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 9, 9, 9, 7, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:10:09,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 19:10:09,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:10:09,767 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:10:09,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:10:09,768 INFO L85 PathProgramCache]: Analyzing trace with hash -2127219320, now seen corresponding path program 5 times [2021-11-25 19:10:09,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:10:09,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603086705] [2021-11-25 19:10:09,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:10:09,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:10:09,790 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:10:09,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1350570620] [2021-11-25 19:10:09,791 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:10:09,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:10:09,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:10:09,792 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:10:09,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 19:10:10,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 19:10:10,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:10:10,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 19:10:10,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:10:10,749 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 196 proven. 88 refuted. 0 times theorem prover too weak. 706 trivial. 0 not checked. [2021-11-25 19:10:10,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:10:11,231 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 196 proven. 88 refuted. 0 times theorem prover too weak. 706 trivial. 0 not checked. [2021-11-25 19:10:11,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:10:11,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603086705] [2021-11-25 19:10:11,231 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:10:11,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350570620] [2021-11-25 19:10:11,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350570620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:10:11,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428825090] [2021-11-25 19:10:11,234 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:10:11,234 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:10:11,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:10:11,235 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:10:11,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:10:19,711 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 116 for LOIs [2021-11-25 19:10:19,725 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:10:19,763 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:10:27,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23940#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 24))' at error location [2021-11-25 19:10:27,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:10:27,294 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:10:27,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-11-25 19:10:27,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569831413] [2021-11-25 19:10:27,294 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:10:27,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:10:27,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:10:27,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:10:27,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1121, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 19:10:27,297 INFO L87 Difference]: Start difference. First operand 743 states and 967 transitions. Second operand has 14 states, 14 states have (on average 7.142857142857143) internal successors, (100), 14 states have internal predecessors, (100), 14 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 13 states have call predecessors, (29), 13 states have call successors, (29) [2021-11-25 19:10:29,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:10:29,075 INFO L93 Difference]: Finished difference Result 2700 states and 3687 transitions. [2021-11-25 19:10:29,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 19:10:29,076 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.142857142857143) internal successors, (100), 14 states have internal predecessors, (100), 14 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 13 states have call predecessors, (29), 13 states have call successors, (29) Word has length 170 [2021-11-25 19:10:29,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:10:29,096 INFO L225 Difference]: With dead ends: 2700 [2021-11-25 19:10:29,096 INFO L226 Difference]: Without dead ends: 2421 [2021-11-25 19:10:29,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=483, Invalid=3549, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 19:10:29,101 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 308 mSDsluCounter, 1024 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 1241 SdHoareTripleChecker+Invalid, 899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:10:29,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [312 Valid, 1241 Invalid, 899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 752 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:10:29,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2421 states. [2021-11-25 19:10:29,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2421 to 1851. [2021-11-25 19:10:29,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1851 states, 1397 states have (on average 1.1789549033643523) internal successors, (1647), 1413 states have internal predecessors, (1647), 430 states have call successors, (430), 24 states have call predecessors, (430), 23 states have return successors, (429), 413 states have call predecessors, (429), 429 states have call successors, (429) [2021-11-25 19:10:29,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1851 states to 1851 states and 2506 transitions. [2021-11-25 19:10:29,390 INFO L78 Accepts]: Start accepts. Automaton has 1851 states and 2506 transitions. Word has length 170 [2021-11-25 19:10:29,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:10:29,391 INFO L470 AbstractCegarLoop]: Abstraction has 1851 states and 2506 transitions. [2021-11-25 19:10:29,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.142857142857143) internal successors, (100), 14 states have internal predecessors, (100), 14 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 13 states have call predecessors, (29), 13 states have call successors, (29) [2021-11-25 19:10:29,392 INFO L276 IsEmpty]: Start isEmpty. Operand 1851 states and 2506 transitions. [2021-11-25 19:10:29,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 19:10:29,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:10:29,403 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 9, 8, 8, 8, 8, 7, 7, 7, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:10:29,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:10:29,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:10:29,608 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:10:29,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:10:29,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1956685860, now seen corresponding path program 6 times [2021-11-25 19:10:29,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:10:29,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152730222] [2021-11-25 19:10:29,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:10:29,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:10:29,632 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:10:29,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [845792997] [2021-11-25 19:10:29,638 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:10:29,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:10:29,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:10:29,639 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:10:29,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 19:10:29,729 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:10:29,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:10:29,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 19:10:29,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:10:30,174 INFO L134 CoverageAnalysis]: Checked inductivity of 982 backedges. 432 proven. 84 refuted. 0 times theorem prover too weak. 466 trivial. 0 not checked. [2021-11-25 19:10:30,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:10:30,533 INFO L134 CoverageAnalysis]: Checked inductivity of 982 backedges. 200 proven. 84 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2021-11-25 19:10:30,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:10:30,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152730222] [2021-11-25 19:10:30,533 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:10:30,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845792997] [2021-11-25 19:10:30,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845792997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:10:30,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [290528379] [2021-11-25 19:10:30,536 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:10:30,536 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:10:30,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:10:30,554 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:10:30,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:10:37,581 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 116 for LOIs [2021-11-25 19:10:37,592 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:10:37,624 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:10:45,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31480#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 24))' at error location [2021-11-25 19:10:45,619 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:10:45,619 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:10:45,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-11-25 19:10:45,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001412119] [2021-11-25 19:10:45,619 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:10:45,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:10:45,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:10:45,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:10:45,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1117, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 19:10:45,621 INFO L87 Difference]: Start difference. First operand 1851 states and 2506 transitions. Second operand has 14 states, 14 states have (on average 7.571428571428571) internal successors, (106), 14 states have internal predecessors, (106), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2021-11-25 19:10:47,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:10:47,370 INFO L93 Difference]: Finished difference Result 3917 states and 5396 transitions. [2021-11-25 19:10:47,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 19:10:47,370 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.571428571428571) internal successors, (106), 14 states have internal predecessors, (106), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 170 [2021-11-25 19:10:47,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:10:47,390 INFO L225 Difference]: With dead ends: 3917 [2021-11-25 19:10:47,390 INFO L226 Difference]: Without dead ends: 3102 [2021-11-25 19:10:47,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=509, Invalid=3273, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:10:47,397 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 211 mSDsluCounter, 1058 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 1215 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:10:47,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 1215 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:10:47,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3102 states. [2021-11-25 19:10:47,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3102 to 2615. [2021-11-25 19:10:47,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2615 states, 1974 states have (on average 1.1783181357649444) internal successors, (2326), 1996 states have internal predecessors, (2326), 617 states have call successors, (617), 24 states have call predecessors, (617), 23 states have return successors, (616), 594 states have call predecessors, (616), 616 states have call successors, (616) [2021-11-25 19:10:47,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2615 states to 2615 states and 3559 transitions. [2021-11-25 19:10:47,808 INFO L78 Accepts]: Start accepts. Automaton has 2615 states and 3559 transitions. Word has length 170 [2021-11-25 19:10:47,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:10:47,808 INFO L470 AbstractCegarLoop]: Abstraction has 2615 states and 3559 transitions. [2021-11-25 19:10:47,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.571428571428571) internal successors, (106), 14 states have internal predecessors, (106), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2021-11-25 19:10:47,809 INFO L276 IsEmpty]: Start isEmpty. Operand 2615 states and 3559 transitions. [2021-11-25 19:10:47,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 19:10:47,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:10:47,823 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 9, 9, 9, 7, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:10:47,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 19:10:48,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-25 19:10:48,039 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:10:48,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:10:48,039 INFO L85 PathProgramCache]: Analyzing trace with hash -1244987000, now seen corresponding path program 7 times [2021-11-25 19:10:48,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:10:48,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445804243] [2021-11-25 19:10:48,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:10:48,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:10:48,050 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:10:48,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1163348130] [2021-11-25 19:10:48,052 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:10:48,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:10:48,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:10:48,053 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:10:48,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 19:10:48,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:10:48,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 19:10:48,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:10:48,679 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 58 proven. 930 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:10:48,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:10:48,982 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 58 proven. 246 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2021-11-25 19:10:48,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:10:48,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445804243] [2021-11-25 19:10:48,983 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:10:48,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163348130] [2021-11-25 19:10:48,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163348130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:10:48,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [469326027] [2021-11-25 19:10:48,988 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:10:48,988 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:10:48,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:10:48,989 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:10:48,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:10:52,930 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 49 for LOIs [2021-11-25 19:10:52,941 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:10:52,987 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:11:11,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41813#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:11:11,430 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:11:11,430 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:11:11,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23] total 23 [2021-11-25 19:11:11,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390333779] [2021-11-25 19:11:11,431 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:11:11,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 19:11:11,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:11:11,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 19:11:11,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=1308, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 19:11:11,433 INFO L87 Difference]: Start difference. First operand 2615 states and 3559 transitions. Second operand has 23 states, 23 states have (on average 5.6521739130434785) internal successors, (130), 23 states have internal predecessors, (130), 21 states have call successors, (43), 22 states have call predecessors, (43), 21 states have return successors, (42), 20 states have call predecessors, (42), 20 states have call successors, (42) [2021-11-25 19:11:12,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:11:12,502 INFO L93 Difference]: Finished difference Result 2765 states and 3760 transitions. [2021-11-25 19:11:12,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 19:11:12,503 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 5.6521739130434785) internal successors, (130), 23 states have internal predecessors, (130), 21 states have call successors, (43), 22 states have call predecessors, (43), 21 states have return successors, (42), 20 states have call predecessors, (42), 20 states have call successors, (42) Word has length 170 [2021-11-25 19:11:12,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:11:12,525 INFO L225 Difference]: With dead ends: 2765 [2021-11-25 19:11:12,525 INFO L226 Difference]: Without dead ends: 2678 [2021-11-25 19:11:12,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 458 SyntacticMatches, 10 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=792, Invalid=2748, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 19:11:12,530 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 314 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 247 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 247 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:11:12,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [314 Valid, 403 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [247 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:11:12,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2678 states. [2021-11-25 19:11:12,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2678 to 2650. [2021-11-25 19:11:12,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2650 states, 2018 states have (on average 1.1694747274529236) internal successors, (2360), 2019 states have internal predecessors, (2360), 608 states have call successors, (608), 24 states have call predecessors, (608), 23 states have return successors, (607), 606 states have call predecessors, (607), 607 states have call successors, (607) [2021-11-25 19:11:12,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2650 states to 2650 states and 3575 transitions. [2021-11-25 19:11:12,928 INFO L78 Accepts]: Start accepts. Automaton has 2650 states and 3575 transitions. Word has length 170 [2021-11-25 19:11:12,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:11:12,929 INFO L470 AbstractCegarLoop]: Abstraction has 2650 states and 3575 transitions. [2021-11-25 19:11:12,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 5.6521739130434785) internal successors, (130), 23 states have internal predecessors, (130), 21 states have call successors, (43), 22 states have call predecessors, (43), 21 states have return successors, (42), 20 states have call predecessors, (42), 20 states have call successors, (42) [2021-11-25 19:11:12,930 INFO L276 IsEmpty]: Start isEmpty. Operand 2650 states and 3575 transitions. [2021-11-25 19:11:12,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-25 19:11:12,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:11:12,946 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 8, 8, 8, 8, 8, 8, 8, 8, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:11:12,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 19:11:13,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:11:13,171 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:11:13,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:11:13,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1221781800, now seen corresponding path program 2 times [2021-11-25 19:11:13,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:11:13,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362923917] [2021-11-25 19:11:13,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:11:13,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:11:13,201 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:11:13,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [401930741] [2021-11-25 19:11:13,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:11:13,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:11:13,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:11:13,208 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:11:13,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 19:11:13,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-25 19:11:13,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:11:13,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 19:11:13,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:11:34,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 202 proven. 263 refuted. 0 times theorem prover too weak. 593 trivial. 0 not checked. [2021-11-25 19:11:34,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:11:59,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:11:59,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362923917] [2021-11-25 19:11:59,257 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:11:59,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401930741] [2021-11-25 19:11:59,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401930741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:11:59,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [477993617] [2021-11-25 19:11:59,259 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:11:59,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:11:59,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:11:59,260 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:11:59,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:12:03,214 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-25 19:12:03,455 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:12:03,493 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:12:42,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50370#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:12:42,863 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:12:42,863 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:12:42,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-25 19:12:42,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74020881] [2021-11-25 19:12:42,863 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 19:12:42,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 19:12:42,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:12:42,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 19:12:42,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1969, Unknown=7, NotChecked=0, Total=2162 [2021-11-25 19:12:42,866 INFO L87 Difference]: Start difference. First operand 2650 states and 3575 transitions. Second operand has 17 states, 15 states have (on average 4.8) internal successors, (72), 13 states have internal predecessors, (72), 11 states have call successors, (21), 2 states have call predecessors, (21), 4 states have return successors, (21), 13 states have call predecessors, (21), 11 states have call successors, (21) [2021-11-25 19:12:43,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:12:43,729 INFO L93 Difference]: Finished difference Result 3862 states and 5278 transitions. [2021-11-25 19:12:43,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:12:43,733 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 4.8) internal successors, (72), 13 states have internal predecessors, (72), 11 states have call successors, (21), 2 states have call predecessors, (21), 4 states have return successors, (21), 13 states have call predecessors, (21), 11 states have call successors, (21) Word has length 174 [2021-11-25 19:12:43,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:12:43,758 INFO L225 Difference]: With dead ends: 3862 [2021-11-25 19:12:43,758 INFO L226 Difference]: Without dead ends: 3068 [2021-11-25 19:12:43,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 414 SyntacticMatches, 8 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 63.3s TimeCoverageRelationStatistics Valid=203, Invalid=2142, Unknown=7, NotChecked=0, Total=2352 [2021-11-25 19:12:43,765 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 40 mSDsluCounter, 1147 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 1222 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 231 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:12:43,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 1222 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 0 Unknown, 231 Unchecked, 0.1s Time] [2021-11-25 19:12:43,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3068 states. [2021-11-25 19:12:44,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3068 to 2938. [2021-11-25 19:12:44,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2938 states, 2240 states have (on average 1.1669642857142857) internal successors, (2614), 2241 states have internal predecessors, (2614), 674 states have call successors, (674), 24 states have call predecessors, (674), 23 states have return successors, (673), 672 states have call predecessors, (673), 673 states have call successors, (673) [2021-11-25 19:12:44,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2938 states to 2938 states and 3961 transitions. [2021-11-25 19:12:44,210 INFO L78 Accepts]: Start accepts. Automaton has 2938 states and 3961 transitions. Word has length 174 [2021-11-25 19:12:44,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:12:44,210 INFO L470 AbstractCegarLoop]: Abstraction has 2938 states and 3961 transitions. [2021-11-25 19:12:44,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 4.8) internal successors, (72), 13 states have internal predecessors, (72), 11 states have call successors, (21), 2 states have call predecessors, (21), 4 states have return successors, (21), 13 states have call predecessors, (21), 11 states have call successors, (21) [2021-11-25 19:12:44,211 INFO L276 IsEmpty]: Start isEmpty. Operand 2938 states and 3961 transitions. [2021-11-25 19:12:44,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-25 19:12:44,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:12:44,227 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 9, 9, 9, 9, 7, 7, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:12:44,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:12:44,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:12:44,434 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:12:44,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:12:44,435 INFO L85 PathProgramCache]: Analyzing trace with hash 2024537482, now seen corresponding path program 3 times [2021-11-25 19:12:44,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:12:44,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608863451] [2021-11-25 19:12:44,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:12:44,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:12:44,453 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:12:44,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764624080] [2021-11-25 19:12:44,453 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:12:44,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:12:44,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:12:44,454 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:12:44,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 19:12:44,549 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:12:44,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:12:44,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:12:44,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:12:45,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 133 proven. 4 refuted. 0 times theorem prover too weak. 925 trivial. 0 not checked. [2021-11-25 19:12:45,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:12:46,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 133 proven. 4 refuted. 0 times theorem prover too weak. 925 trivial. 0 not checked. [2021-11-25 19:12:46,122 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:12:46,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608863451] [2021-11-25 19:12:46,122 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:12:46,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764624080] [2021-11-25 19:12:46,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764624080] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:12:46,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561854027] [2021-11-25 19:12:46,124 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:12:46,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:12:46,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:12:46,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:12:46,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:12:52,981 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 136 for LOIs [2021-11-25 19:12:54,459 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:12:54,504 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:13:15,167 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60978#(and (<= 0 |#NULL.base|) (<= ~counter~0 22) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:13:15,167 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:13:15,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:13:15,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-11-25 19:13:15,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599685892] [2021-11-25 19:13:15,168 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:13:15,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:13:15,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:13:15,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:13:15,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=818, Unknown=1, NotChecked=0, Total=930 [2021-11-25 19:13:15,170 INFO L87 Difference]: Start difference. First operand 2938 states and 3961 transitions. Second operand has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 9 states have internal predecessors, (35), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 19:13:18,269 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:13:18,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:13:18,723 INFO L93 Difference]: Finished difference Result 2966 states and 3993 transitions. [2021-11-25 19:13:18,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:13:18,724 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 9 states have internal predecessors, (35), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 174 [2021-11-25 19:13:18,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:13:18,747 INFO L225 Difference]: With dead ends: 2966 [2021-11-25 19:13:18,748 INFO L226 Difference]: Without dead ends: 2932 [2021-11-25 19:13:18,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 479 SyntacticMatches, 13 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=125, Invalid=930, Unknown=1, NotChecked=0, Total=1056 [2021-11-25 19:13:18,751 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 65 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 29 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:13:18,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 133 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 100 Invalid, 1 Unknown, 0 Unchecked, 3.1s Time] [2021-11-25 19:13:18,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2932 states. [2021-11-25 19:13:19,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2932 to 2717. [2021-11-25 19:13:19,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2717 states, 2069 states have (on average 1.153697438376027) internal successors, (2387), 2069 states have internal predecessors, (2387), 624 states have call successors, (624), 24 states have call predecessors, (624), 23 states have return successors, (623), 623 states have call predecessors, (623), 623 states have call successors, (623) [2021-11-25 19:13:19,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2717 states to 2717 states and 3634 transitions. [2021-11-25 19:13:19,210 INFO L78 Accepts]: Start accepts. Automaton has 2717 states and 3634 transitions. Word has length 174 [2021-11-25 19:13:19,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:13:19,211 INFO L470 AbstractCegarLoop]: Abstraction has 2717 states and 3634 transitions. [2021-11-25 19:13:19,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 9 states have internal predecessors, (35), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 19:13:19,211 INFO L276 IsEmpty]: Start isEmpty. Operand 2717 states and 3634 transitions. [2021-11-25 19:13:19,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-25 19:13:19,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:19,226 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:19,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:13:19,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:19,447 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:19,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:19,447 INFO L85 PathProgramCache]: Analyzing trace with hash -334500248, now seen corresponding path program 4 times [2021-11-25 19:13:19,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:19,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114686737] [2021-11-25 19:13:19,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:19,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:19,456 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:13:19,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2145416560] [2021-11-25 19:13:19,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:13:19,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:19,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:19,457 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:13:19,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 19:13:19,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:13:19,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 19:13:19,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:13:20,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1076 backedges. 286 proven. 164 refuted. 0 times theorem prover too weak. 626 trivial. 0 not checked. [2021-11-25 19:13:20,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:13:21,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1076 backedges. 94 proven. 216 refuted. 0 times theorem prover too weak. 766 trivial. 0 not checked. [2021-11-25 19:13:21,499 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:13:21,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114686737] [2021-11-25 19:13:21,499 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:13:21,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145416560] [2021-11-25 19:13:21,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145416560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:13:21,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608167703] [2021-11-25 19:13:21,501 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:13:21,501 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:13:21,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:13:21,502 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:13:21,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:13:30,307 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 127 for LOIs [2021-11-25 19:13:31,292 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-25 19:13:31,335 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:13:43,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70034#(and (<= 0 |#NULL.base|) (<= ~counter~0 22) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:13:43,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:13:43,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:13:43,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-11-25 19:13:43,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73446406] [2021-11-25 19:13:43,059 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:13:43,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:13:43,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:13:43,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:13:43,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1481, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 19:13:43,060 INFO L87 Difference]: Start difference. First operand 2717 states and 3634 transitions. Second operand has 22 states, 22 states have (on average 5.7272727272727275) internal successors, (126), 22 states have internal predecessors, (126), 22 states have call successors, (41), 2 states have call predecessors, (41), 2 states have return successors, (40), 22 states have call predecessors, (40), 22 states have call successors, (40) [2021-11-25 19:13:47,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:13:47,078 INFO L93 Difference]: Finished difference Result 4677 states and 6378 transitions. [2021-11-25 19:13:47,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 19:13:47,079 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.7272727272727275) internal successors, (126), 22 states have internal predecessors, (126), 22 states have call successors, (41), 2 states have call predecessors, (41), 2 states have return successors, (40), 22 states have call predecessors, (40), 22 states have call successors, (40) Word has length 174 [2021-11-25 19:13:47,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:13:47,107 INFO L225 Difference]: With dead ends: 4677 [2021-11-25 19:13:47,108 INFO L226 Difference]: Without dead ends: 3934 [2021-11-25 19:13:47,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 470 SyntacticMatches, 11 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=514, Invalid=2908, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:13:47,113 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 303 mSDsluCounter, 1305 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 1486 SdHoareTripleChecker+Invalid, 983 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:13:47,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 1486 Invalid, 983 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-25 19:13:47,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3934 states. [2021-11-25 19:13:47,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3934 to 3029. [2021-11-25 19:13:47,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3029 states, 2309 states have (on average 1.15937635339974) internal successors, (2677), 2309 states have internal predecessors, (2677), 696 states have call successors, (696), 24 states have call predecessors, (696), 23 states have return successors, (695), 695 states have call predecessors, (695), 695 states have call successors, (695) [2021-11-25 19:13:47,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3029 states to 3029 states and 4068 transitions. [2021-11-25 19:13:47,557 INFO L78 Accepts]: Start accepts. Automaton has 3029 states and 4068 transitions. Word has length 174 [2021-11-25 19:13:47,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:13:47,557 INFO L470 AbstractCegarLoop]: Abstraction has 3029 states and 4068 transitions. [2021-11-25 19:13:47,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.7272727272727275) internal successors, (126), 22 states have internal predecessors, (126), 22 states have call successors, (41), 2 states have call predecessors, (41), 2 states have return successors, (40), 22 states have call predecessors, (40), 22 states have call successors, (40) [2021-11-25 19:13:47,558 INFO L276 IsEmpty]: Start isEmpty. Operand 3029 states and 4068 transitions. [2021-11-25 19:13:47,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-25 19:13:47,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:13:47,574 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 11, 11, 11, 11, 8, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:47,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 19:13:47,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 19:13:47,799 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:13:47,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:13:47,800 INFO L85 PathProgramCache]: Analyzing trace with hash 972139980, now seen corresponding path program 5 times [2021-11-25 19:13:47,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:13:47,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059686932] [2021-11-25 19:13:47,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:13:47,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:13:47,807 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:13:47,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [690847388] [2021-11-25 19:13:47,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:13:47,808 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:13:47,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:13:47,809 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:13:47,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 19:13:50,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 19:13:50,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-11-25 19:13:50,453 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 19:13:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 19:13:50,748 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 19:13:50,749 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 19:13:50,750 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 19:13:50,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 19:13:50,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 19:13:50,955 INFO L732 BasicCegarLoop]: Path program histogram: [7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:13:50,958 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 19:13:51,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 07:13:51 BoogieIcfgContainer [2021-11-25 19:13:51,061 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 19:13:51,062 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 19:13:51,062 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 19:13:51,062 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 19:13:51,063 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:06:15" (3/4) ... [2021-11-25 19:13:51,064 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-25 19:13:51,215 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/witness.graphml [2021-11-25 19:13:51,215 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 19:13:51,217 INFO L158 Benchmark]: Toolchain (without parser) took 456339.29ms. Allocated memory was 98.6MB in the beginning and 664.8MB in the end (delta: 566.2MB). Free memory was 69.3MB in the beginning and 291.7MB in the end (delta: -222.3MB). Peak memory consumption was 344.5MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,219 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 98.6MB. Free memory is still 51.5MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:13:51,222 INFO L158 Benchmark]: CACSL2BoogieTranslator took 262.12ms. Allocated memory was 98.6MB in the beginning and 146.8MB in the end (delta: 48.2MB). Free memory was 69.1MB in the beginning and 122.7MB in the end (delta: -53.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,222 INFO L158 Benchmark]: Boogie Procedure Inliner took 34.31ms. Allocated memory is still 146.8MB. Free memory was 122.7MB in the beginning and 120.6MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,223 INFO L158 Benchmark]: Boogie Preprocessor took 21.73ms. Allocated memory is still 146.8MB. Free memory was 120.6MB in the beginning and 119.7MB in the end (delta: 889.1kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,224 INFO L158 Benchmark]: RCFGBuilder took 326.91ms. Allocated memory is still 146.8MB. Free memory was 119.7MB in the beginning and 108.6MB in the end (delta: 11.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,224 INFO L158 Benchmark]: TraceAbstraction took 455521.44ms. Allocated memory was 146.8MB in the beginning and 664.8MB in the end (delta: 518.0MB). Free memory was 108.6MB in the beginning and 300.0MB in the end (delta: -191.4MB). Peak memory consumption was 328.8MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,225 INFO L158 Benchmark]: Witness Printer took 153.63ms. Allocated memory is still 664.8MB. Free memory was 300.0MB in the beginning and 291.7MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-25 19:13:51,231 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23ms. Allocated memory is still 98.6MB. Free memory is still 51.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 262.12ms. Allocated memory was 98.6MB in the beginning and 146.8MB in the end (delta: 48.2MB). Free memory was 69.1MB in the beginning and 122.7MB in the end (delta: -53.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 34.31ms. Allocated memory is still 146.8MB. Free memory was 122.7MB in the beginning and 120.6MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 21.73ms. Allocated memory is still 146.8MB. Free memory was 120.6MB in the beginning and 119.7MB in the end (delta: 889.1kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 326.91ms. Allocated memory is still 146.8MB. Free memory was 119.7MB in the beginning and 108.6MB in the end (delta: 11.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 455521.44ms. Allocated memory was 146.8MB in the beginning and 664.8MB in the end (delta: 518.0MB). Free memory was 108.6MB in the beginning and 300.0MB in the end (delta: -191.4MB). Peak memory consumption was 328.8MB. Max. memory is 16.1GB. * Witness Printer took 153.63ms. Allocated memory is still 664.8MB. Free memory was 300.0MB in the beginning and 291.7MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 14]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L19] int counter = 0; [L21] int A, R; [L22] long long u, v, r; [L23] A = __VERIFIER_nondet_int() [L24] R = __VERIFIER_nondet_int() [L25] CALL assume_abort_if_not((((long long) R - 1) * ((long long) R - 1)) < A) VAL [\old(cond)=1, counter=0] [L9] COND FALSE !(!cond) [L25] RET assume_abort_if_not((((long long) R - 1) * ((long long) R - 1)) < A) VAL [A=623, counter=0, R=24] [L27] CALL assume_abort_if_not(A % 2 == 1) VAL [\old(cond)=1, counter=0] [L9] COND FALSE !(!cond) [L27] RET assume_abort_if_not(A % 2 == 1) VAL [A=623, counter=0, R=24] [L29] u = ((long long) 2 * R) + 1 [L30] v = 1 [L31] r = ((long long) R * R) - A VAL [A=623, counter=0, R=24, r=-47, u=49, v=1] [L34] EXPR counter++ VAL [A=623, counter=1, counter++=0, r=-47, R=24, u=49, v=1] [L34] COND TRUE counter++<20 [L35] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=1] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L35] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=1, R=24, r=-47, u=49, v=1] [L36] COND FALSE !(!(r != 0)) VAL [A=623, counter=1, R=24, r=-47, u=49, v=1] [L39] EXPR counter++ VAL [A=623, counter=2, counter++=1, r=-47, R=24, u=49, v=1] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=2] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=2, R=24, r=-47, u=49, v=1] [L41] COND TRUE !(r > 0) VAL [A=623, counter=2, r=-47, R=24, u=49, v=1] [L47] EXPR counter++ VAL [A=623, counter=3, counter++=2, R=24, r=-47, u=49, v=1] [L47] COND TRUE counter++<20 [L48] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=3] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L48] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=3, R=24, r=-47, u=49, v=1] [L49] COND FALSE !(!(r < 0)) [L51] r = r + u [L52] u = u + 2 VAL [A=623, counter=3, R=24, r=2, u=51, v=1] [L47] EXPR counter++ VAL [A=623, counter=4, counter++=3, R=24, r=2, u=51, v=1] [L47] COND TRUE counter++<20 [L48] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=4] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L48] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=4, R=24, r=2, u=51, v=1] [L49] COND TRUE !(r < 0) VAL [A=623, counter=4, r=2, R=24, u=51, v=1] [L34] EXPR counter++ VAL [A=623, counter=5, counter++=4, R=24, r=2, u=51, v=1] [L34] COND TRUE counter++<20 [L35] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=5] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L35] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=5, r=2, R=24, u=51, v=1] [L36] COND FALSE !(!(r != 0)) VAL [A=623, counter=5, r=2, R=24, u=51, v=1] [L39] EXPR counter++ VAL [A=623, counter=6, counter++=5, R=24, r=2, u=51, v=1] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=6] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=6] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=6, r=2, R=24, u=51, v=1] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=6, R=24, r=1, u=51, v=3] [L39] EXPR counter++ VAL [A=623, counter=7, counter++=6, R=24, r=1, u=51, v=3] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=7] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=7] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=7, R=24, r=1, u=51, v=3] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=7, r=-2, R=24, u=51, v=5] [L39] EXPR counter++ VAL [A=623, counter=8, counter++=7, R=24, r=-2, u=51, v=5] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=8] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=8] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=8, r=-2, R=24, u=51, v=5] [L41] COND TRUE !(r > 0) VAL [A=623, counter=8, r=-2, R=24, u=51, v=5] [L47] EXPR counter++ VAL [A=623, counter=9, counter++=8, r=-2, R=24, u=51, v=5] [L47] COND TRUE counter++<20 [L48] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=9] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=9] [L48] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=9, r=-2, R=24, u=51, v=5] [L49] COND FALSE !(!(r < 0)) [L51] r = r + u [L52] u = u + 2 VAL [A=623, counter=9, r=49, R=24, u=53, v=5] [L47] EXPR counter++ VAL [A=623, counter=10, counter++=9, r=49, R=24, u=53, v=5] [L47] COND TRUE counter++<20 [L48] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=10] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=10] [L48] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=10, r=49, R=24, u=53, v=5] [L49] COND TRUE !(r < 0) VAL [A=623, counter=10, r=49, R=24, u=53, v=5] [L34] EXPR counter++ VAL [A=623, counter=11, counter++=10, r=49, R=24, u=53, v=5] [L34] COND TRUE counter++<20 [L35] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=11] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=11] [L35] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=11, r=49, R=24, u=53, v=5] [L36] COND FALSE !(!(r != 0)) VAL [A=623, counter=11, R=24, r=49, u=53, v=5] [L39] EXPR counter++ VAL [A=623, counter=12, counter++=11, r=49, R=24, u=53, v=5] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=12] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=12] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=12, r=49, R=24, u=53, v=5] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=12, r=44, R=24, u=53, v=7] [L39] EXPR counter++ VAL [A=623, counter=13, counter++=12, r=44, R=24, u=53, v=7] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=13] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=13] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=13, r=44, R=24, u=53, v=7] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=13, r=37, R=24, u=53, v=9] [L39] EXPR counter++ VAL [A=623, counter=14, counter++=13, r=37, R=24, u=53, v=9] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=14] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=14] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=14, r=37, R=24, u=53, v=9] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=14, r=28, R=24, u=53, v=11] [L39] EXPR counter++ VAL [A=623, counter=15, counter++=14, R=24, r=28, u=53, v=11] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=15] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=15] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=15, r=28, R=24, u=53, v=11] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=15, r=17, R=24, u=53, v=13] [L39] EXPR counter++ VAL [A=623, counter=16, counter++=15, r=17, R=24, u=53, v=13] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=16] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=16] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=16, r=17, R=24, u=53, v=13] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=16, r=4, R=24, u=53, v=15] [L39] EXPR counter++ VAL [A=623, counter=17, counter++=16, R=24, r=4, u=53, v=15] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=17] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=17] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=17, R=24, r=4, u=53, v=15] [L41] COND FALSE !(!(r > 0)) [L43] r = r - v [L44] v = v + 2 VAL [A=623, counter=17, R=24, r=-11, u=53, v=17] [L39] EXPR counter++ VAL [A=623, counter=18, counter++=17, r=-11, R=24, u=53, v=17] [L39] COND TRUE counter++<20 [L40] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=18] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=18] [L40] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=18, r=-11, R=24, u=53, v=17] [L41] COND TRUE !(r > 0) VAL [A=623, counter=18, r=-11, R=24, u=53, v=17] [L47] EXPR counter++ VAL [A=623, counter=19, counter++=18, r=-11, R=24, u=53, v=17] [L47] COND TRUE counter++<20 [L48] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=19] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=19] [L48] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=19, R=24, r=-11, u=53, v=17] [L49] COND FALSE !(!(r < 0)) [L51] r = r + u [L52] u = u + 2 VAL [A=623, counter=19, r=42, R=24, u=55, v=17] [L47] EXPR counter++ VAL [A=623, counter=20, counter++=19, r=42, R=24, u=55, v=17] [L47] COND TRUE counter++<20 [L48] CALL __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=1, counter=20] [L12] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=20] [L48] RET __VERIFIER_assert(4*(A+r) == u*u - v*v - 2*u + 2*v) VAL [A=623, counter=20, r=42, R=24, u=55, v=17] [L49] COND TRUE !(r < 0) VAL [A=623, counter=20, R=24, r=42, u=55, v=17] [L34] EXPR counter++ VAL [A=623, counter=21, counter++=20, r=42, R=24, u=55, v=17] [L34] COND FALSE !(counter++<20) [L56] CALL __VERIFIER_assert(((long long) 4*A) == u*u - v*v - 2*u + 2*v) VAL [\old(cond)=0, counter=21] [L12] COND TRUE !(cond) VAL [\old(cond)=0, cond=0, counter=21] [L14] reach_error() VAL [\old(cond)=0, cond=0, counter=21] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 455.3s, OverallIterations: 25, TraceHistogramMax: 21, PathProgramHistogramMax: 7, EmptinessCheckTime: 0.1s, AutomataDifference: 39.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 6 mSolverCounterUnknown, 3484 SdHoareTripleChecker+Valid, 30.9s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 3450 mSDsluCounter, 9193 SdHoareTripleChecker+Invalid, 29.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 337 IncrementalHoareTripleChecker+Unchecked, 7725 mSDsCounter, 2059 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 4544 IncrementalHoareTripleChecker+Invalid, 6946 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2059 mSolverCounterUnsat, 1568 mSDtfsCounter, 4544 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 5389 GetRequests, 4579 SyntacticMatches, 77 SemanticMatches, 733 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11848 ImplicationChecksByTransitivity, 281.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3029occurred in iteration=24, InterpolantAutomatonStates: 400, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 3.2s AutomataMinimizationTime, 24 MinimizatonAttempts, 2724 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 4.4s SatisfiabilityAnalysisTime, 56.9s InterpolantComputationTime, 2159 NumberOfCodeBlocks, 2002 NumberOfCodeBlocksAsserted, 52 NumberOfCheckSat, 3424 ConstructedInterpolants, 76 QuantifiedInterpolants, 15701 SizeOfPredicates, 101 NumberOfNonLiveVariables, 4730 ConjunctsInSsa, 312 ConjunctsInUnsatCore, 41 InterpolantComputations, 7 PerfectInterpolantSequences, 11448/14444 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 2.0s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 6, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 36, DAG_INTERPRETER_EARLY_EXITS: 2, TOOLS_POST_APPLICATIONS: 30, TOOLS_POST_TIME: 0.8s, TOOLS_POST_CALL_APPLICATIONS: 20, TOOLS_POST_CALL_TIME: 0.6s, TOOLS_POST_RETURN_APPLICATIONS: 12, TOOLS_POST_RETURN_TIME: 0.1s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 62, TOOLS_QUANTIFIERELIM_TIME: 1.4s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.1s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 96, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 20, DOMAIN_JOIN_TIME: 0.2s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 36, DOMAIN_ISBOTTOM_TIME: 0.2s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 12, CALL_SUMMARIZER_CACHE_MISSES: 4, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 327, DAG_COMPRESSION_RETAINED_NODES: 104, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-11-25 19:13:51,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd13424a-a726-4517-960e-dbeadd447466/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE