./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P --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 f5697d76d3e5ae232d0e056ee307ac88ca38e983a94c4765bc5d51f77e79d2f7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:58:13,556 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:58:13,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:58:13,612 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:58:13,613 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:58:13,618 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:58:13,621 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:58:13,625 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:58:13,629 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:58:13,638 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:58:13,639 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:58:13,640 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:58:13,641 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:58:13,644 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:58:13,647 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:58:13,653 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:58:13,655 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:58:13,656 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:58:13,659 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:58:13,667 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:58:13,670 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:58:13,671 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:58:13,675 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:58:13,676 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:58:13,683 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:58:13,683 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:58:13,684 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:58:13,686 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:58:13,687 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:58:13,689 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:58:13,690 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:58:13,692 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:58:13,694 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:58:13,695 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:58:13,697 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:58:13,697 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:58:13,698 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:58:13,699 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:58:13,699 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:58:13,700 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:58:13,701 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:58:13,702 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:58:13,759 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:58:13,759 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:58:13,760 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:58:13,760 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:58:13,767 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:58:13,768 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:58:13,768 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:58:13,768 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:58:13,769 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:58:13,769 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:58:13,770 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:58:13,771 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:58:13,771 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:58:13,771 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:58:13,771 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:58:13,772 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:58:13,772 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:58:13,772 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:58:13,773 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:58:13,773 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:58:13,774 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:58:13,774 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:58:13,774 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:58:13,775 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:58:13,775 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:58:13,775 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:58:13,775 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:58:13,776 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:58:13,776 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:58:13,776 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:58:13,777 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:58:13,777 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:58:13,777 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:13,778 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:58:13,778 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:58:13,778 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:58:13,779 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:58:13,779 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:58:13,779 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:58:13,779 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:58:13,780 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:58:13,780 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_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f5697d76d3e5ae232d0e056ee307ac88ca38e983a94c4765bc5d51f77e79d2f7 [2021-11-21 01:58:14,059 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:58:14,085 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:58:14,089 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:58:14,090 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:58:14,091 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:58:14,093 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c [2021-11-21 01:58:14,163 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/data/c0a8f4543/8c4ee8f306c34520a67be2da083ca08a/FLAG64cbe6a96 [2021-11-21 01:58:14,724 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:58:14,728 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c [2021-11-21 01:58:14,740 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/data/c0a8f4543/8c4ee8f306c34520a67be2da083ca08a/FLAG64cbe6a96 [2021-11-21 01:58:15,062 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/data/c0a8f4543/8c4ee8f306c34520a67be2da083ca08a [2021-11-21 01:58:15,065 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:58:15,067 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:58:15,069 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:15,078 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:58:15,080 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:58:15,081 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,082 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45d7c124 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15, skipping insertion in model container [2021-11-21 01:58:15,082 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,091 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:58:15,113 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:58:15,293 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_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c[490,503] [2021-11-21 01:58:15,317 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:15,326 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:58:15,338 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_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c[490,503] [2021-11-21 01:58:15,352 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:15,366 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:58:15,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15 WrapperNode [2021-11-21 01:58:15,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:15,369 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:15,369 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:58:15,369 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:58:15,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,384 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,405 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-21 01:58:15,406 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:15,407 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:58:15,407 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:58:15,407 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:58:15,415 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,418 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,423 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,427 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,429 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,431 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:58:15,432 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:58:15,433 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:58:15,433 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:58:15,434 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (1/1) ... [2021-11-21 01:58:15,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:15,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:15,481 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:58:15,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:58:15,522 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:58:15,523 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:58:15,523 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:58:15,523 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:58:15,524 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:58:15,524 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:58:15,524 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:58:15,524 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:58:15,589 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:58:15,591 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:58:15,774 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:58:15,805 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:58:15,805 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:58:15,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:15 BoogieIcfgContainer [2021-11-21 01:58:15,816 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:58:15,834 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:58:15,834 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:58:15,838 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:58:15,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:58:15" (1/3) ... [2021-11-21 01:58:15,839 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@596c8a76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:15, skipping insertion in model container [2021-11-21 01:58:15,839 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:15" (2/3) ... [2021-11-21 01:58:15,840 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@596c8a76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:15, skipping insertion in model container [2021-11-21 01:58:15,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:15" (3/3) ... [2021-11-21 01:58:15,842 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound100.c [2021-11-21 01:58:15,860 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:58:15,860 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:58:15,917 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:58:15,927 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 [2021-11-21 01:58:15,927 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:58:15,978 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 01:58:15,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:58:15,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:15,985 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:15,986 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:16,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:16,009 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-21 01:58:16,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:16,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527248552] [2021-11-21 01:58:16,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:16,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:16,154 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:16,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1917758370] [2021-11-21 01:58:16,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:16,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:16,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:16,159 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:16,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:58:16,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:16,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-21 01:58:16,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:16,415 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:58:16,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:16,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:16,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527248552] [2021-11-21 01:58:16,416 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:16,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917758370] [2021-11-21 01:58:16,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917758370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:16,418 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:16,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:58:16,420 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618613239] [2021-11-21 01:58:16,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:16,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:58:16,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:16,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:58:16,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:58:16,481 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:58:16,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:16,537 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-21 01:58:16,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:58:16,540 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2021-11-21 01:58:16,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:16,554 INFO L225 Difference]: With dead ends: 49 [2021-11-21 01:58:16,554 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:58:16,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:58:16,568 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:16,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:16,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:58:16,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 01:58:16,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:58:16,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-21 01:58:16,648 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-21 01:58:16,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:16,652 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-21 01:58:16,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:58:16,654 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-21 01:58:16,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:58:16,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:16,661 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:16,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:16,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-21 01:58:16,877 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:16,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:16,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-21 01:58:16,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:16,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206389294] [2021-11-21 01:58:16,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:16,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:16,908 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:16,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [528761213] [2021-11-21 01:58:16,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:16,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:16,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:16,920 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:16,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:58:17,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:17,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:58:17,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:17,245 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:58:17,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:17,458 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:58:17,459 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:17,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206389294] [2021-11-21 01:58:17,459 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:17,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528761213] [2021-11-21 01:58:17,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528761213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:17,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1675490258] [2021-11-21 01:58:17,494 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:58:17,495 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:17,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:17,507 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:17,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:20,713 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:58:20,726 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:21,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1675490258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:21,228 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:58:21,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-21 01:58:21,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418082560] [2021-11-21 01:58:21,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:21,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:58:21,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:21,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:58:21,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:58:21,231 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-21 01:58:21,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:21,392 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-21 01:58:21,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:58:21,393 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2021-11-21 01:58:21,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:21,394 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:58:21,395 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 01:58:21,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:58:21,397 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 39 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:21,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 53 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:58:21,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 01:58:21,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-21 01:58:21,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:58:21,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-21 01:58:21,413 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-21 01:58:21,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:21,413 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-21 01:58:21,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-21 01:58:21,414 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-21 01:58:21,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:58:21,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:21,416 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:21,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:21,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:21,633 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:21,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:21,634 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-21 01:58:21,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:21,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686916973] [2021-11-21 01:58:21,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:21,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:21,648 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:21,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1915434431] [2021-11-21 01:58:21,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:21,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:21,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:21,650 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:21,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:58:21,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:21,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:58:21,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:21,816 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:58:21,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:21,905 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:58:21,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:21,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686916973] [2021-11-21 01:58:21,906 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:21,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915434431] [2021-11-21 01:58:21,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915434431] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:21,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:58:21,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:58:21,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169007728] [2021-11-21 01:58:21,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:21,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:58:21,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:21,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:58:21,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:58:21,910 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:58:22,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:22,031 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-21 01:58:22,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:58:22,032 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2021-11-21 01:58:22,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:22,033 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:58:22,033 INFO L226 Difference]: Without dead ends: 34 [2021-11-21 01:58:22,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:58:22,035 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:22,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:58:22,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-21 01:58:22,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-21 01:58:22,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:58:22,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-21 01:58:22,047 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-21 01:58:22,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:22,047 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-21 01:58:22,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:58:22,048 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-21 01:58:22,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:58:22,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:22,049 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:22,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:22,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:22,266 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:22,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:22,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-21 01:58:22,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:22,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264482041] [2021-11-21 01:58:22,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:22,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:22,281 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:22,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [191021557] [2021-11-21 01:58:22,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:22,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:22,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:22,283 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:22,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:58:22,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:22,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:58:22,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:22,530 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:58:22,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:22,728 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:58:22,729 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:22,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264482041] [2021-11-21 01:58:22,729 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:22,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191021557] [2021-11-21 01:58:22,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191021557] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:22,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:58:22,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:58:22,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478754796] [2021-11-21 01:58:22,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:22,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:58:22,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:22,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:58:22,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:58:22,732 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:58:22,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:22,867 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-21 01:58:22,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:58:22,868 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2021-11-21 01:58:22,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:22,870 INFO L225 Difference]: With dead ends: 47 [2021-11-21 01:58:22,870 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:58:22,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:58:22,871 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:22,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:58:22,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:58:22,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-21 01:58:22,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 01:58:22,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-21 01:58:22,885 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-21 01:58:22,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:22,885 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-21 01:58:22,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:58:22,886 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-21 01:58:22,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 01:58:22,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:22,887 INFO L514 BasicCegarLoop]: trace histogram [6, 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, 1] [2021-11-21 01:58:22,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:23,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:23,088 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:23,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:23,088 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-21 01:58:23,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:23,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608599242] [2021-11-21 01:58:23,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:23,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:23,102 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:23,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [244945348] [2021-11-21 01:58:23,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:23,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:23,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:23,104 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:23,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:58:23,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:23,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:58:23,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:23,383 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-21 01:58:23,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:23,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:23,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608599242] [2021-11-21 01:58:23,458 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:23,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244945348] [2021-11-21 01:58:23,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244945348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:23,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [754943294] [2021-11-21 01:58:23,462 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-21 01:58:23,462 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:23,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:23,463 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:23,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:29,903 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-21 01:58:30,044 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:58:30,058 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:31,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [754943294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:31,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:58:31,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-21 01:58:31,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535549768] [2021-11-21 01:58:31,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:31,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:58:31,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:31,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:58:31,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:58:31,271 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-21 01:58:31,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:31,794 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-21 01:58:31,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:58:31,795 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2021-11-21 01:58:31,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:31,797 INFO L225 Difference]: With dead ends: 65 [2021-11-21 01:58:31,797 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 01:58:31,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:58:31,799 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 37 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:31,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 59 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:58:31,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 01:58:31,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-21 01:58:31,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 01:58:31,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-21 01:58:31,817 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-21 01:58:31,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:31,818 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-21 01:58:31,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-21 01:58:31,819 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-21 01:58:31,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:58:31,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:31,821 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:31,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:32,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:32,035 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:32,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:32,036 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-21 01:58:32,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:32,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083765689] [2021-11-21 01:58:32,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:32,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:32,050 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:32,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1534161531] [2021-11-21 01:58:32,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:32,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:32,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:32,066 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:32,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:58:32,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:32,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:58:32,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:32,288 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 01:58:32,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:32,461 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 01:58:32,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:32,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083765689] [2021-11-21 01:58:32,462 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:32,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534161531] [2021-11-21 01:58:32,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534161531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:32,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [761285981] [2021-11-21 01:58:32,465 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:58:32,466 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:32,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:32,467 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:32,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:35,162 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-21 01:59:35,341 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:59:35,355 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:38,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [761285981] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:38,620 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:38,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 7] total 21 [2021-11-21 01:59:38,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260381710] [2021-11-21 01:59:38,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:38,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 01:59:38,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:38,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 01:59:38,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:59:38,623 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-21 01:59:39,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:39,632 INFO L93 Difference]: Finished difference Result 87 states and 108 transitions. [2021-11-21 01:59:39,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:59:39,633 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 52 [2021-11-21 01:59:39,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:39,634 INFO L225 Difference]: With dead ends: 87 [2021-11-21 01:59:39,635 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 01:59:39,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 126 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:59:39,637 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:39,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 69 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:59:39,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 01:59:39,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-21 01:59:39,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 46 states have internal predecessors, (51), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-21 01:59:39,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-11-21 01:59:39,659 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 52 [2021-11-21 01:59:39,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:39,660 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-11-21 01:59:39,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-21 01:59:39,661 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-11-21 01:59:39,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 01:59:39,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:39,663 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:39,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:39,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:59:39,865 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:39,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:39,866 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-21 01:59:39,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:39,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241471070] [2021-11-21 01:59:39,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:39,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:39,891 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:39,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1002088195] [2021-11-21 01:59:39,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:39,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:39,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:39,900 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:39,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:59:39,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:39,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:59:39,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:40,110 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:59:40,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:40,306 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:59:40,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:40,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241471070] [2021-11-21 01:59:40,307 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:40,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002088195] [2021-11-21 01:59:40,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002088195] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:40,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1086008852] [2021-11-21 01:59:40,311 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:59:40,311 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:40,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:40,312 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:40,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:03,564 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:03,565 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:03,886 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:03,887 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:04,714 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:04,715 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:05,318 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:05,318 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:05,638 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:05,639 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:07,096 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:07,097 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:13,501 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 02:00:13,578 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:00:13,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:15,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:15,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:00:15,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-21 02:00:15,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181496821] [2021-11-21 02:00:15,567 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:15,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 02:00:15,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:15,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 02:00:15,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=592, Unknown=0, NotChecked=0, Total=702 [2021-11-21 02:00:15,569 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 02:00:15,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:15,775 INFO L93 Difference]: Finished difference Result 93 states and 113 transitions. [2021-11-21 02:00:15,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 02:00:15,776 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 60 [2021-11-21 02:00:15,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:15,783 INFO L225 Difference]: With dead ends: 93 [2021-11-21 02:00:15,783 INFO L226 Difference]: Without dead ends: 91 [2021-11-21 02:00:15,784 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 150 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2021-11-21 02:00:15,786 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:15,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 151 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 02:00:15,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-21 02:00:15,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-21 02:00:15,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 27 states have call successors, (27), 11 states have call predecessors, (27), 11 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-21 02:00:15,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 111 transitions. [2021-11-21 02:00:15,826 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 111 transitions. Word has length 60 [2021-11-21 02:00:15,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:15,827 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 111 transitions. [2021-11-21 02:00:15,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 02:00:15,827 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 111 transitions. [2021-11-21 02:00:15,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-21 02:00:15,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:15,829 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:15,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:16,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 02:00:16,057 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:00:16,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:16,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-21 02:00:16,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:16,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194299778] [2021-11-21 02:00:16,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:16,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:16,067 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:00:16,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [456708485] [2021-11-21 02:00:16,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:00:16,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:16,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:16,071 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:16,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 02:00:16,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 02:00:16,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:00:16,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 02:00:16,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:16,315 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 02:00:16,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:16,494 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 02:00:16,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:16,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194299778] [2021-11-21 02:00:16,495 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:00:16,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456708485] [2021-11-21 02:00:16,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456708485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:16,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318508782] [2021-11-21 02:00:16,499 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 02:00:16,499 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:16,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:16,500 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:16,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:38,063 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:38,064 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:38,308 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:38,309 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:38,972 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:38,973 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:39,498 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:39,498 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:39,740 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:39,741 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:41,005 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:41,006 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:47,295 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 02:00:47,369 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:00:47,382 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:49,608 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:49,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:00:49,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-21 02:00:49,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567693075] [2021-11-21 02:00:49,608 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:49,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 02:00:49,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:49,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 02:00:49,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=593, Unknown=0, NotChecked=0, Total=702 [2021-11-21 02:00:49,610 INFO L87 Difference]: Start difference. First operand 91 states and 111 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-21 02:00:49,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:49,765 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2021-11-21 02:00:49,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 02:00:49,765 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2021-11-21 02:00:49,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:49,768 INFO L225 Difference]: With dead ends: 98 [2021-11-21 02:00:49,768 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 02:00:49,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 165 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=126, Invalid=686, Unknown=0, NotChecked=0, Total=812 [2021-11-21 02:00:49,770 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:49,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 135 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 02:00:49,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 02:00:49,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-21 02:00:49,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 57 states have internal predecessors, (61), 28 states have call successors, (28), 12 states have call predecessors, (28), 12 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-21 02:00:49,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 116 transitions. [2021-11-21 02:00:49,798 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 116 transitions. Word has length 65 [2021-11-21 02:00:49,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:49,799 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 116 transitions. [2021-11-21 02:00:49,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-21 02:00:49,799 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 116 transitions. [2021-11-21 02:00:49,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 02:00:49,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:49,802 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:49,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:50,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:50,017 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:00:50,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:50,018 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-21 02:00:50,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:50,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024927824] [2021-11-21 02:00:50,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:50,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:50,030 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:00:50,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1276039903] [2021-11-21 02:00:50,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:50,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:50,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:50,032 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:50,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 02:00:50,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:50,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 02:00:50,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:50,713 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 02:00:50,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:51,559 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 02:00:51,559 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:51,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024927824] [2021-11-21 02:00:51,559 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:00:51,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276039903] [2021-11-21 02:00:51,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276039903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:51,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [406656914] [2021-11-21 02:00:51,563 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 02:00:51,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:51,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:51,564 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:51,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:35,893 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:01:36,004 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:01:36,023 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:49,961 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:49,961 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:01:49,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-21 02:01:49,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151385234] [2021-11-21 02:01:49,962 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:49,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 02:01:49,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:49,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 02:01:49,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1235, Unknown=1, NotChecked=0, Total=1406 [2021-11-21 02:01:49,964 INFO L87 Difference]: Start difference. First operand 96 states and 116 transitions. Second operand has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:01:54,760 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:02:00,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:02:00,762 INFO L93 Difference]: Finished difference Result 193 states and 265 transitions. [2021-11-21 02:02:00,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 02:02:00,763 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 74 [2021-11-21 02:02:00,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:02:00,766 INFO L225 Difference]: With dead ends: 193 [2021-11-21 02:02:00,766 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 02:02:00,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 180 SyntacticMatches, 4 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=427, Invalid=2878, Unknown=1, NotChecked=0, Total=3306 [2021-11-21 02:02:00,768 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 60 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 587 mSolverCounterSat, 161 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 587 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2021-11-21 02:02:00,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 448 Invalid, 749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 587 Invalid, 1 Unknown, 0 Unchecked, 7.4s Time] [2021-11-21 02:02:00,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 02:02:00,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 181. [2021-11-21 02:02:00,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 96 states have (on average 1.1979166666666667) internal successors, (115), 99 states have internal predecessors, (115), 69 states have call successors, (69), 15 states have call predecessors, (69), 15 states have return successors, (68), 66 states have call predecessors, (68), 68 states have call successors, (68) [2021-11-21 02:02:00,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 252 transitions. [2021-11-21 02:02:00,828 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 252 transitions. Word has length 74 [2021-11-21 02:02:00,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:02:00,828 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 252 transitions. [2021-11-21 02:02:00,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:02:00,829 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 252 transitions. [2021-11-21 02:02:00,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 02:02:00,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:02:00,831 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:02:00,857 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-21 02:02:01,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:01,045 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:02:01,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:02:01,046 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-21 02:02:01,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:02:01,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132358560] [2021-11-21 02:02:01,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:02:01,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:02:01,057 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:02:01,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [884914385] [2021-11-21 02:02:01,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:02:01,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:01,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:02:01,072 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:02:01,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 02:02:01,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:02:01,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 02:02:01,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:02:01,545 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-21 02:02:01,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:02:01,795 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-21 02:02:01,795 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:02:01,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132358560] [2021-11-21 02:02:01,796 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:02:01,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884914385] [2021-11-21 02:02:01,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884914385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:02:01,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583298776] [2021-11-21 02:02:01,799 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 02:02:01,799 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:02:01,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:02:01,800 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:02:01,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:02:18,089 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:02:18,168 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:02:18,179 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:02:24,449 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:02:24,449 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:02:24,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-21 02:02:24,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716520318] [2021-11-21 02:02:24,450 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:02:24,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 02:02:24,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:02:24,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 02:02:24,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 02:02:24,452 INFO L87 Difference]: Start difference. First operand 181 states and 252 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:02:26,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:02:26,481 INFO L93 Difference]: Finished difference Result 214 states and 289 transitions. [2021-11-21 02:02:26,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 02:02:26,482 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 79 [2021-11-21 02:02:26,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:02:26,491 INFO L225 Difference]: With dead ends: 214 [2021-11-21 02:02:26,491 INFO L226 Difference]: Without dead ends: 208 [2021-11-21 02:02:26,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 199 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=237, Invalid=1833, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 02:02:26,494 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 49 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 02:02:26,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 269 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 02:02:26,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-21 02:02:26,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2021-11-21 02:02:26,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 116 states have (on average 1.1551724137931034) internal successors, (134), 120 states have internal predecessors, (134), 71 states have call successors, (71), 18 states have call predecessors, (71), 18 states have return successors, (70), 67 states have call predecessors, (70), 70 states have call successors, (70) [2021-11-21 02:02:26,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 275 transitions. [2021-11-21 02:02:26,563 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 275 transitions. Word has length 79 [2021-11-21 02:02:26,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:02:26,563 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 275 transitions. [2021-11-21 02:02:26,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:02:26,564 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 275 transitions. [2021-11-21 02:02:26,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 02:02:26,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:02:26,566 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:02:26,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 02:02:26,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 02:02:26,773 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:02:26,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:02:26,773 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-21 02:02:26,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:02:26,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346035396] [2021-11-21 02:02:26,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:02:26,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:02:26,783 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:02:26,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [785905308] [2021-11-21 02:02:26,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:02:26,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:26,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:02:26,787 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:02:26,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 02:02:26,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:02:26,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 02:02:26,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:02:27,875 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 02:02:27,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:02:33,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:02:33,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346035396] [2021-11-21 02:02:33,192 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:02:33,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785905308] [2021-11-21 02:02:33,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785905308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:02:33,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1687976790] [2021-11-21 02:02:33,195 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:02:33,195 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:02:33,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:02:33,196 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:02:33,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:02:44,447 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:44,447 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:45,901 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:45,902 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:49,629 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:49,629 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:52,281 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:02:52,282 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:03:01,799 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 02:03:01,861 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:03:01,874 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:03:13,659 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:03:13,660 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 02:03:13,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-21 02:03:13,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57051114] [2021-11-21 02:03:13,660 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 02:03:13,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 02:03:13,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:03:13,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 02:03:13,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1101, Unknown=2, NotChecked=0, Total=1260 [2021-11-21 02:03:13,663 INFO L87 Difference]: Start difference. First operand 206 states and 275 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-21 02:03:14,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:03:14,467 INFO L93 Difference]: Finished difference Result 218 states and 285 transitions. [2021-11-21 02:03:14,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 02:03:14,468 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 90 [2021-11-21 02:03:14,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:03:14,470 INFO L225 Difference]: With dead ends: 218 [2021-11-21 02:03:14,471 INFO L226 Difference]: Without dead ends: 216 [2021-11-21 02:03:14,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 181 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=181, Invalid=1299, Unknown=2, NotChecked=0, Total=1482 [2021-11-21 02:03:14,473 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 20 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 02:03:14,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 270 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 02:03:14,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-21 02:03:14,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 214. [2021-11-21 02:03:14,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 122 states have (on average 1.1475409836065573) internal successors, (140), 126 states have internal predecessors, (140), 71 states have call successors, (71), 20 states have call predecessors, (71), 20 states have return successors, (70), 67 states have call predecessors, (70), 70 states have call successors, (70) [2021-11-21 02:03:14,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 281 transitions. [2021-11-21 02:03:14,531 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 281 transitions. Word has length 90 [2021-11-21 02:03:14,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:03:14,531 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 281 transitions. [2021-11-21 02:03:14,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-21 02:03:14,532 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 281 transitions. [2021-11-21 02:03:14,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 02:03:14,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:03:14,534 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:03:14,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 02:03:14,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 02:03:14,749 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:03:14,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:03:14,750 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-21 02:03:14,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:03:14,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088745197] [2021-11-21 02:03:14,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:03:14,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:03:14,764 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:03:14,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [149459573] [2021-11-21 02:03:14,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:03:14,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:03:14,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:03:14,770 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:03:14,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 02:03:14,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 02:03:14,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:03:14,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 02:03:14,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:03:14,984 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-21 02:03:14,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 02:03:14,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:03:14,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088745197] [2021-11-21 02:03:14,984 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:03:14,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149459573] [2021-11-21 02:03:14,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149459573] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 02:03:14,984 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 02:03:14,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 02:03:14,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078357722] [2021-11-21 02:03:14,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 02:03:14,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 02:03:14,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:03:14,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 02:03:14,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 02:03:14,986 INFO L87 Difference]: Start difference. First operand 214 states and 281 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 02:03:15,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:03:15,083 INFO L93 Difference]: Finished difference Result 287 states and 377 transitions. [2021-11-21 02:03:15,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 02:03:15,083 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2021-11-21 02:03:15,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:03:15,085 INFO L225 Difference]: With dead ends: 287 [2021-11-21 02:03:15,086 INFO L226 Difference]: Without dead ends: 200 [2021-11-21 02:03:15,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 02:03:15,088 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 02:03:15,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 02:03:15,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-21 02:03:15,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-11-21 02:03:15,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 113 states have (on average 1.1238938053097345) internal successors, (127), 116 states have internal predecessors, (127), 65 states have call successors, (65), 20 states have call predecessors, (65), 20 states have return successors, (64), 62 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-21 02:03:15,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 256 transitions. [2021-11-21 02:03:15,138 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 256 transitions. Word has length 99 [2021-11-21 02:03:15,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:03:15,138 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 256 transitions. [2021-11-21 02:03:15,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 02:03:15,139 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 256 transitions. [2021-11-21 02:03:15,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-21 02:03:15,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:03:15,141 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:03:15,177 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-21 02:03:15,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:03:15,357 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:03:15,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:03:15,358 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-21 02:03:15,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:03:15,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305206058] [2021-11-21 02:03:15,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:03:15,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:03:15,373 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:03:15,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1213040306] [2021-11-21 02:03:15,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:03:15,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:03:15,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:03:15,374 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:03:15,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 02:03:15,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 02:03:15,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:03:15,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 02:03:15,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:03:16,025 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 55 proven. 41 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2021-11-21 02:03:16,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:03:16,320 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-21 02:03:16,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:03:16,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305206058] [2021-11-21 02:03:16,321 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:03:16,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213040306] [2021-11-21 02:03:16,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213040306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:03:16,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [106817972] [2021-11-21 02:03:16,324 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:03:16,324 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:03:16,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:03:16,324 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:03:16,325 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:03:33,826 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 02:03:33,891 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:03:33,903 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:03:40,439 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:03:40,440 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:03:40,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 16 [2021-11-21 02:03:40,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247918839] [2021-11-21 02:03:40,440 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:03:40,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 02:03:40,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:03:40,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 02:03:40,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 02:03:40,442 INFO L87 Difference]: Start difference. First operand 199 states and 256 transitions. Second operand has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2021-11-21 02:03:41,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:03:41,936 INFO L93 Difference]: Finished difference Result 262 states and 351 transitions. [2021-11-21 02:03:41,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 02:03:41,937 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 105 [2021-11-21 02:03:41,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:03:41,942 INFO L225 Difference]: With dead ends: 262 [2021-11-21 02:03:41,943 INFO L226 Difference]: Without dead ends: 260 [2021-11-21 02:03:41,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 274 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=218, Invalid=1762, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 02:03:41,947 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 42 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 02:03:41,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 412 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 02:03:41,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-21 02:03:42,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 207. [2021-11-21 02:03:42,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 119 states have (on average 1.1176470588235294) internal successors, (133), 122 states have internal predecessors, (133), 65 states have call successors, (65), 22 states have call predecessors, (65), 22 states have return successors, (64), 62 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-21 02:03:42,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 262 transitions. [2021-11-21 02:03:42,013 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 262 transitions. Word has length 105 [2021-11-21 02:03:42,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:03:42,013 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 262 transitions. [2021-11-21 02:03:42,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2021-11-21 02:03:42,014 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 262 transitions. [2021-11-21 02:03:42,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-21 02:03:42,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:03:42,019 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:03:42,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 02:03:42,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:03:42,233 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:03:42,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:03:42,234 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-21 02:03:42,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:03:42,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465888987] [2021-11-21 02:03:42,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:03:42,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:03:42,244 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:03:42,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2101776917] [2021-11-21 02:03:42,248 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 02:03:42,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:03:42,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:03:42,250 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:03:42,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 02:03:42,321 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 02:03:42,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:03:42,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 02:03:42,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:03:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 02:03:43,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:03:47,779 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 02:03:47,779 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:03:47,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465888987] [2021-11-21 02:03:47,780 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:03:47,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101776917] [2021-11-21 02:03:47,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101776917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:03:47,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080105555] [2021-11-21 02:03:47,783 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:03:47,783 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:03:47,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:03:47,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:03:47,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:04:02,753 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:04:02,830 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:04:02,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:04:13,205 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:04:13,205 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:04:13,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-21 02:04:13,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001848500] [2021-11-21 02:04:13,206 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:04:13,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 02:04:13,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:04:13,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 02:04:13,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1588, Unknown=1, NotChecked=0, Total=1806 [2021-11-21 02:04:13,208 INFO L87 Difference]: Start difference. First operand 207 states and 262 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) [2021-11-21 02:04:16,143 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse8 (* |c_ULTIMATE.start_main_~c~0#1| (- 1))) (.cse5 (+ .cse2 .cse0 .cse1)) (.cse7 (* |c_ULTIMATE.start_main_~b~0#1| 2)) (.cse3 (* 3 |c_ULTIMATE.start_main_~b~0#1|))) (and (or (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (let ((.cse6 (+ .cse7 .cse8 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse4 (div .cse6 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse2) (<= .cse3 |c_ULTIMATE.start_main_~c~0#1|) (= (+ (* .cse4 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse4 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~c~0#1|) .cse5) (not (= (mod .cse6 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse4 (+ 2 |c_ULTIMATE.start_main_~k~0#1|))))) (let ((.cse9 (+ .cse8 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse10 (div .cse9 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse9 |c_ULTIMATE.start_main_~b~0#1|) 0)) (<= .cse2 |c_ULTIMATE.start_main_~c~0#1|) (< .cse10 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse10 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse10 |c_ULTIMATE.start_main_~s~0#1|)) (+ |c_ULTIMATE.start_main_~b~0#1| .cse0 .cse1))))) (= |c_ULTIMATE.start_main_~b~0#1| (+ (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|))) (or (= .cse5 (let ((.cse11 (div .cse7 |c_ULTIMATE.start_main_~b~0#1|))) (+ (* |c_ULTIMATE.start_main_~y~0#1| .cse11 |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| .cse11 |c_ULTIMATE.start_main_~q~0#1|) |c_ULTIMATE.start_main_~a~0#1|))) (<= .cse3 |c_ULTIMATE.start_main_~a~0#1|) (< |c_ULTIMATE.start_main_~a~0#1| .cse2))))) is different from true [2021-11-21 02:04:18,641 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:20,644 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:22,648 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:24,651 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:26,179 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:28,519 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse6 (* |c_ULTIMATE.start_main_~c~0#1| (- 1))) (.cse3 (+ .cse0 .cse9 .cse10)) (.cse5 (* |c_ULTIMATE.start_main_~b~0#1| 2)) (.cse1 (* 3 |c_ULTIMATE.start_main_~b~0#1|))) (and (let ((.cse4 (+ .cse5 .cse6 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse2 (div .cse4 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse0) (<= .cse1 |c_ULTIMATE.start_main_~c~0#1|) (= (+ (* .cse2 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse2 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~c~0#1|) .cse3) (not (= (mod .cse4 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse2 (+ 2 |c_ULTIMATE.start_main_~k~0#1|))))) (let ((.cse7 (+ .cse6 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse8 (div .cse7 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse7 |c_ULTIMATE.start_main_~b~0#1|) 0)) (<= .cse0 |c_ULTIMATE.start_main_~c~0#1|) (< .cse8 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse8 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse8 |c_ULTIMATE.start_main_~s~0#1|)) (+ |c_ULTIMATE.start_main_~b~0#1| .cse9 .cse10))))) (= |c_ULTIMATE.start_main_~b~0#1| (+ (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|))) (or (not (= (+ (* |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~c~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (= (+ .cse9 .cse10) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (or (= .cse3 (let ((.cse11 (div .cse5 |c_ULTIMATE.start_main_~b~0#1|))) (+ (* |c_ULTIMATE.start_main_~y~0#1| .cse11 |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| .cse11 |c_ULTIMATE.start_main_~q~0#1|) |c_ULTIMATE.start_main_~a~0#1|))) (<= .cse1 |c_ULTIMATE.start_main_~a~0#1|) (< |c_ULTIMATE.start_main_~a~0#1| .cse0))))) is different from true [2021-11-21 02:04:30,542 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse3 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse5 (* |c_ULTIMATE.start_main_~c~0#1| (- 1)))) (and (let ((.cse4 (+ (* |c_ULTIMATE.start_main_~b~0#1| 2) .cse5 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse1 (div .cse4 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse0) (<= (* 3 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~c~0#1|) (= (+ (* .cse1 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse1 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~c~0#1|) (+ .cse0 .cse2 .cse3)) (not (= (mod .cse4 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse1 (+ 2 |c_ULTIMATE.start_main_~k~0#1|))))) (let ((.cse6 (+ .cse5 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse7 (div .cse6 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse6 |c_ULTIMATE.start_main_~b~0#1|) 0)) (<= .cse0 |c_ULTIMATE.start_main_~c~0#1|) (< .cse7 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse7 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse7 |c_ULTIMATE.start_main_~s~0#1|)) (+ |c_ULTIMATE.start_main_~b~0#1| .cse2 .cse3))))))) is different from true [2021-11-21 02:04:37,141 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:39,384 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:41,412 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:43,881 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:05:24,616 WARN L227 SmtUtils]: Spent 40.18s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:05:26,620 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:05:28,623 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:05:31,334 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse5 (* |c_ULTIMATE.start_main_~c~0#1| (- 1)))) (and (or (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (let ((.cse4 (+ (* |c_ULTIMATE.start_main_~b~0#1| 2) .cse5 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse3 (div .cse4 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse2) (<= (* 3 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~c~0#1|) (= (+ (* .cse3 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse3 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~c~0#1|) (+ .cse2 .cse0 .cse1)) (not (= (mod .cse4 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse3 (+ 2 |c_ULTIMATE.start_main_~k~0#1|))))) (let ((.cse6 (+ .cse5 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse7 (div .cse6 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse6 |c_ULTIMATE.start_main_~b~0#1|) 0)) (<= .cse2 |c_ULTIMATE.start_main_~c~0#1|) (< .cse7 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse7 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse7 |c_ULTIMATE.start_main_~s~0#1|)) (+ |c_ULTIMATE.start_main_~b~0#1| .cse0 .cse1))))))) is different from true [2021-11-21 02:06:13,440 WARN L227 SmtUtils]: Spent 41.41s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:06:21,329 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:35,938 WARN L227 SmtUtils]: Spent 14.14s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:06:37,988 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse6 (* |c_ULTIMATE.start_main_~c~0#1| (- 1))) (.cse3 (+ .cse0 .cse9 .cse10)) (.cse5 (* |c_ULTIMATE.start_main_~b~0#1| 2)) (.cse1 (* 3 |c_ULTIMATE.start_main_~b~0#1|))) (and (let ((.cse4 (+ .cse5 .cse6 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse2 (div .cse4 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse0) (<= .cse1 |c_ULTIMATE.start_main_~c~0#1|) (= (+ (* .cse2 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse2 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~c~0#1|) .cse3) (not (= (mod .cse4 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse2 (+ 2 |c_ULTIMATE.start_main_~k~0#1|))))) (let ((.cse7 (+ .cse6 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse8 (div .cse7 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse7 |c_ULTIMATE.start_main_~b~0#1|) 0)) (<= .cse0 |c_ULTIMATE.start_main_~c~0#1|) (< .cse8 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse8 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse8 |c_ULTIMATE.start_main_~s~0#1|)) (+ |c_ULTIMATE.start_main_~b~0#1| .cse9 .cse10))))) (= |c_ULTIMATE.start_main_~b~0#1| (+ (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|))) (or (= .cse3 (let ((.cse11 (div .cse5 |c_ULTIMATE.start_main_~b~0#1|))) (+ (* |c_ULTIMATE.start_main_~y~0#1| .cse11 |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| .cse11 |c_ULTIMATE.start_main_~q~0#1|) |c_ULTIMATE.start_main_~a~0#1|))) (<= .cse1 |c_ULTIMATE.start_main_~a~0#1|) (< |c_ULTIMATE.start_main_~a~0#1| .cse0))))) is different from true [2021-11-21 02:06:40,118 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:46,846 WARN L227 SmtUtils]: Spent 5.79s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:07:26,239 WARN L227 SmtUtils]: Spent 35.52s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:07:27,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:07:27,348 INFO L93 Difference]: Finished difference Result 279 states and 365 transitions. [2021-11-21 02:07:27,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 02:07:27,349 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) Word has length 107 [2021-11-21 02:07:27,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:07:27,351 INFO L225 Difference]: With dead ends: 279 [2021-11-21 02:07:27,351 INFO L226 Difference]: Without dead ends: 277 [2021-11-21 02:07:27,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 275 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 1238 ImplicationChecksByTransitivity, 176.1s TimeCoverageRelationStatistics Valid=542, Invalid=3378, Unknown=6, NotChecked=630, Total=4556 [2021-11-21 02:07:27,353 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 72 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 162 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 32.0s IncrementalHoareTripleChecker+Time [2021-11-21 02:07:27,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 511 Invalid, 758 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 566 Invalid, 11 Unknown, 19 Unchecked, 32.0s Time] [2021-11-21 02:07:27,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-21 02:07:27,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 225. [2021-11-21 02:07:27,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 130 states have (on average 1.1153846153846154) internal successors, (145), 133 states have internal predecessors, (145), 69 states have call successors, (69), 25 states have call predecessors, (69), 25 states have return successors, (68), 66 states have call predecessors, (68), 68 states have call successors, (68) [2021-11-21 02:07:27,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 282 transitions. [2021-11-21 02:07:27,423 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 282 transitions. Word has length 107 [2021-11-21 02:07:27,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:07:27,424 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 282 transitions. [2021-11-21 02:07:27,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) [2021-11-21 02:07:27,424 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 282 transitions. [2021-11-21 02:07:27,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-21 02:07:27,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:07:27,426 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:07:27,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 02:07:27,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 02:07:27,653 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:07:27,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:07:27,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1680324149, now seen corresponding path program 4 times [2021-11-21 02:07:27,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:07:27,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743174987] [2021-11-21 02:07:27,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:07:27,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:07:27,662 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:07:27,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1059139640] [2021-11-21 02:07:27,662 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:07:27,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:07:27,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:07:27,664 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:07:27,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 02:07:27,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:07:27,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 02:07:27,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:07:30,072 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 137 proven. 95 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-21 02:07:30,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:08:00,697 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 146 proven. 51 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-21 02:08:00,697 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:08:00,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743174987] [2021-11-21 02:08:00,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:08:00,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059139640] [2021-11-21 02:08:00,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059139640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:08:00,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1632034105] [2021-11-21 02:08:00,702 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:08:00,703 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:08:00,703 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:08:00,703 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:08:00,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:08:11,312 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:11,312 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:12,521 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:12,522 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:16,110 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:16,110 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:18,758 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:18,758 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:08:34,834 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 02:08:34,895 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:08:34,907 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:08:57,367 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:08:57,367 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:08:57,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2021-11-21 02:08:57,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77439844] [2021-11-21 02:08:57,368 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:08:57,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 02:08:57,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:08:57,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 02:08:57,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=1871, Unknown=2, NotChecked=0, Total=2162 [2021-11-21 02:08:57,370 INFO L87 Difference]: Start difference. First operand 225 states and 282 transitions. Second operand has 27 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 17 states have call successors, (41), 2 states have call predecessors, (41), 3 states have return successors, (40), 16 states have call predecessors, (40), 16 states have call successors, (40) [2021-11-21 02:09:00,716 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:03,907 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:05,938 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:08,825 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:12,499 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:30,051 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:43,099 WARN L227 SmtUtils]: Spent 11.89s on a formula simplification that was a NOOP. DAG size: 85 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:09:45,286 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:09:53,856 WARN L227 SmtUtils]: Spent 6.37s on a formula simplification. DAG size of input: 70 DAG size of output: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:09:59,186 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:15,661 WARN L227 SmtUtils]: Spent 11.72s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:10:48,704 WARN L227 SmtUtils]: Spent 30.12s on a formula simplification. DAG size of input: 99 DAG size of output: 86 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:11:17,739 WARN L227 SmtUtils]: Spent 13.95s on a formula simplification. DAG size of input: 96 DAG size of output: 84 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:11:18,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:11:18,260 INFO L93 Difference]: Finished difference Result 322 states and 423 transitions. [2021-11-21 02:11:18,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-21 02:11:18,260 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 17 states have call successors, (41), 2 states have call predecessors, (41), 3 states have return successors, (40), 16 states have call predecessors, (40), 16 states have call successors, (40) Word has length 112 [2021-11-21 02:11:18,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:11:18,264 INFO L225 Difference]: With dead ends: 322 [2021-11-21 02:11:18,264 INFO L226 Difference]: Without dead ends: 320 [2021-11-21 02:11:18,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 281 SyntacticMatches, 8 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1478 ImplicationChecksByTransitivity, 137.9s TimeCoverageRelationStatistics Valid=651, Invalid=3506, Unknown=3, NotChecked=0, Total=4160 [2021-11-21 02:11:18,266 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 115 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 821 mSolverCounterSat, 262 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 1089 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 821 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 29.0s IncrementalHoareTripleChecker+Time [2021-11-21 02:11:18,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 384 Invalid, 1089 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 821 Invalid, 6 Unknown, 0 Unchecked, 29.0s Time] [2021-11-21 02:11:18,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-11-21 02:11:18,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 309. [2021-11-21 02:11:18,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 173 states have (on average 1.1329479768786128) internal successors, (196), 178 states have internal predecessors, (196), 105 states have call successors, (105), 30 states have call predecessors, (105), 30 states have return successors, (104), 100 states have call predecessors, (104), 104 states have call successors, (104) [2021-11-21 02:11:18,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 405 transitions. [2021-11-21 02:11:18,398 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 405 transitions. Word has length 112 [2021-11-21 02:11:18,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:11:18,399 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 405 transitions. [2021-11-21 02:11:18,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 17 states have call successors, (41), 2 states have call predecessors, (41), 3 states have return successors, (40), 16 states have call predecessors, (40), 16 states have call successors, (40) [2021-11-21 02:11:18,399 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 405 transitions. [2021-11-21 02:11:18,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-21 02:11:18,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:11:18,401 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:11:18,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 02:11:18,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 02:11:18,621 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:11:18,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:11:18,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1506060358, now seen corresponding path program 5 times [2021-11-21 02:11:18,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:11:18,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707161314] [2021-11-21 02:11:18,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:11:18,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:11:18,628 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:11:18,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [314095087] [2021-11-21 02:11:18,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:11:18,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:11:18,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:11:18,630 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:11:18,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c2e50c9-13c7-4042-8fe7-e9d0ee7be960/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 02:11:18,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 02:11:18,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:11:18,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-21 02:11:18,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:11:20,713 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 75 proven. 42 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-21 02:11:20,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:11:28,691 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 83 proven. 34 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-21 02:11:28,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:11:28,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707161314] [2021-11-21 02:11:28,691 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:11:28,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314095087] [2021-11-21 02:11:28,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314095087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:11:28,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1694302902] [2021-11-21 02:11:28,693 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:11:28,693 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:11:28,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:11:28,694 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:11:28,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs