./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound50.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_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/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_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/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_5cbcf92a-fa0f-4890-8f70-412664ae11bc/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 05dbf98a57cbdf117305bcdd9c3dde8d1b2284b890adec5d1f5924f0e5e4bbbb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:01:25,685 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:01:25,688 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:01:25,742 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:01:25,743 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:01:25,747 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:01:25,749 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:01:25,753 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:01:25,756 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:01:25,761 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:01:25,762 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:01:25,768 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:01:25,768 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:01:25,771 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:01:25,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:01:25,777 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:01:25,779 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:01:25,780 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:01:25,782 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:01:25,787 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:01:25,793 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:01:25,794 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:01:25,798 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:01:25,799 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:01:25,807 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:01:25,808 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:01:25,808 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:01:25,810 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:01:25,811 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:01:25,812 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:01:25,813 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:01:25,813 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:01:25,815 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:01:25,816 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:01:25,818 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:01:25,818 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:01:25,819 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:01:25,819 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:01:25,819 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:01:25,820 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:01:25,821 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:01:25,821 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:01:25,865 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:01:25,865 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:01:25,866 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:01:25,866 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:01:25,867 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:01:25,873 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:01:25,873 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:01:25,874 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:01:25,874 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:01:25,874 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:01:25,875 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:01:25,875 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:01:25,875 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:01:25,876 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:01:25,876 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:01:25,876 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:01:25,876 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:01:25,876 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:01:25,877 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:01:25,877 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:01:25,878 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:01:25,878 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:01:25,878 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:01:25,878 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:01:25,878 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:01:25,878 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:01:25,880 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:01:25,880 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:01:25,880 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:01:25,881 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:01:25,881 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:01:25,881 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:01:25,881 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:01:25,882 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:01:25,882 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:01:25,882 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:01:25,882 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:01:25,882 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:01:25,883 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:01:25,883 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:01:25,883 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:01:25,883 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_5cbcf92a-fa0f-4890-8f70-412664ae11bc/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 05dbf98a57cbdf117305bcdd9c3dde8d1b2284b890adec5d1f5924f0e5e4bbbb [2021-11-21 00:01:26,209 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:01:26,231 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:01:26,233 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:01:26,235 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:01:26,235 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:01:26,237 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound50.c [2021-11-21 00:01:26,307 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/data/f270dcd4e/cad931293bdc44278e300ab875e7437f/FLAG872846d10 [2021-11-21 00:01:26,772 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:01:26,776 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound50.c [2021-11-21 00:01:26,789 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/data/f270dcd4e/cad931293bdc44278e300ab875e7437f/FLAG872846d10 [2021-11-21 00:01:27,152 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/data/f270dcd4e/cad931293bdc44278e300ab875e7437f [2021-11-21 00:01:27,154 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:01:27,155 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:01:27,159 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:01:27,159 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:01:27,163 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:01:27,164 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,165 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f7c8beb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27, skipping insertion in model container [2021-11-21 00:01:27,165 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,172 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:01:27,189 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:01:27,383 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_5cbcf92a-fa0f-4890-8f70-412664ae11bc/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound50.c[490,503] [2021-11-21 00:01:27,414 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:01:27,422 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:01:27,434 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_5cbcf92a-fa0f-4890-8f70-412664ae11bc/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound50.c[490,503] [2021-11-21 00:01:27,443 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:01:27,456 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:01:27,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27 WrapperNode [2021-11-21 00:01:27,457 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:01:27,458 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:01:27,458 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:01:27,459 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:01:27,466 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,472 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,492 INFO L137 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2021-11-21 00:01:27,493 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:01:27,494 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:01:27,494 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:01:27,494 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:01:27,503 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,513 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,514 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,516 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:01:27,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:01:27,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:01:27,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:01:27,518 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (1/1) ... [2021-11-21 00:01:27,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:01:27,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:27,553 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:01:27,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:01:27,591 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:01:27,591 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 00:01:27,591 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 00:01:27,592 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:01:27,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:01:27,592 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:01:27,592 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 00:01:27,592 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 00:01:27,653 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:01:27,655 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:01:27,868 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:01:27,903 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:01:27,903 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 00:01:27,905 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:01:27 BoogieIcfgContainer [2021-11-21 00:01:27,906 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:01:27,907 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:01:27,923 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:01:27,927 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:01:27,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:01:27" (1/3) ... [2021-11-21 00:01:27,928 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44aa2ebd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:01:27, skipping insertion in model container [2021-11-21 00:01:27,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:01:27" (2/3) ... [2021-11-21 00:01:27,928 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44aa2ebd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:01:27, skipping insertion in model container [2021-11-21 00:01:27,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:01:27" (3/3) ... [2021-11-21 00:01:27,929 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound50.c [2021-11-21 00:01:27,934 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:01:27,935 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:01:28,020 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:01:28,032 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 00:01:28,033 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:01:28,060 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 00:01:28,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:01:28,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:28,066 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:28,067 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:28,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:28,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2021-11-21 00:01:28,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:28,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172107538] [2021-11-21 00:01:28,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:28,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:28,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:28,294 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:01:28,295 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:28,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172107538] [2021-11-21 00:01:28,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172107538] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:28,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:28,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:01:28,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556272314] [2021-11-21 00:01:28,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:28,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 00:01:28,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:28,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 00:01:28,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:01:28,349 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:01:28,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:28,399 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2021-11-21 00:01:28,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:01:28,403 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2021-11-21 00:01:28,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:28,412 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:01:28,412 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 00:01:28,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 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 00:01:28,422 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:28,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:01:28,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 00:01:28,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 00:01:28,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:01:28,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2021-11-21 00:01:28,479 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2021-11-21 00:01:28,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:28,482 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2021-11-21 00:01:28,483 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:01:28,483 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2021-11-21 00:01:28,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:01:28,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:28,486 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:28,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:01:28,488 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:28,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:28,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2021-11-21 00:01:28,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:28,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56396062] [2021-11-21 00:01:28,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:28,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:28,520 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:01:28,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1487997139] [2021-11-21 00:01:28,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:28,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:28,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:28,524 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:28,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:01:28,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:28,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:01:28,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:28,819 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:01:28,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:01:28,820 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:28,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56396062] [2021-11-21 00:01:28,820 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:01:28,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487997139] [2021-11-21 00:01:28,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487997139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:28,821 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:28,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:01:28,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758483722] [2021-11-21 00:01:28,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:28,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:01:28,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:28,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:01:28,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:01:28,838 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:01:28,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:28,941 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-11-21 00:01:28,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:01:28,942 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2021-11-21 00:01:28,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:28,943 INFO L225 Difference]: With dead ends: 47 [2021-11-21 00:01:28,949 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:01:28,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:28,952 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 29 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:28,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 95 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:01:28,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:01:28,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2021-11-21 00:01:28,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:01:28,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-11-21 00:01:28,973 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2021-11-21 00:01:28,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:28,974 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-11-21 00:01:28,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:01:28,975 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-11-21 00:01:28,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:01:28,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:28,976 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:29,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:29,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:29,177 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:29,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:29,178 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2021-11-21 00:01:29,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:29,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469908312] [2021-11-21 00:01:29,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:29,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:29,195 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:01:29,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [737626239] [2021-11-21 00:01:29,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:29,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:29,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:29,198 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:29,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:01:29,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:29,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:01:29,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:29,456 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:01:29,457 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:01:29,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:29,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469908312] [2021-11-21 00:01:29,457 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:01:29,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737626239] [2021-11-21 00:01:29,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737626239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:29,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:29,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:01:29,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613603379] [2021-11-21 00:01:29,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:29,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:01:29,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:29,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:01:29,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:01:29,460 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:01:29,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:29,509 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-11-21 00:01:29,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:01:29,510 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2021-11-21 00:01:29,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:29,512 INFO L225 Difference]: With dead ends: 46 [2021-11-21 00:01:29,512 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 00:01:29,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:29,514 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 9 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:29,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 127 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:01:29,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 00:01:29,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-11-21 00:01:29,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:01:29,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2021-11-21 00:01:29,527 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2021-11-21 00:01:29,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:29,528 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2021-11-21 00:01:29,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 00:01:29,528 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2021-11-21 00:01:29,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:01:29,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:29,529 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:29,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:29,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:29,730 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:29,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:29,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2021-11-21 00:01:29,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:29,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825297935] [2021-11-21 00:01:29,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:29,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:29,749 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:01:29,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1267864887] [2021-11-21 00:01:29,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:29,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:29,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:29,751 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:29,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:01:29,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:29,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:01:29,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:29,905 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:01:29,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:30,019 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:01:30,020 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:30,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825297935] [2021-11-21 00:01:30,021 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:01:30,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267864887] [2021-11-21 00:01:30,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267864887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:01:30,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602965471] [2021-11-21 00:01:30,044 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:01:30,045 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:01:30,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:01:30,058 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:01:30,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:01:33,883 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:01:33,914 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:01:34,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [602965471] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:34,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:01:34,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2021-11-21 00:01:34,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379142709] [2021-11-21 00:01:34,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:34,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:01:34,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:34,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:01:34,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:01:34,906 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:01:35,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:35,196 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2021-11-21 00:01:35,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:01:35,197 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2021-11-21 00:01:35,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:35,199 INFO L225 Difference]: With dead ends: 71 [2021-11-21 00:01:35,199 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 00:01:35,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:01:35,201 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 45 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:35,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 49 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:01:35,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 00:01:35,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2021-11-21 00:01:35,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:01:35,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2021-11-21 00:01:35,244 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2021-11-21 00:01:35,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:35,244 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2021-11-21 00:01:35,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:01:35,245 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2021-11-21 00:01:35,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:01:35,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:35,248 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 00:01:35,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:35,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:35,476 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:35,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:35,476 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2021-11-21 00:01:35,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:35,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847532989] [2021-11-21 00:01:35,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:35,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:35,498 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:01:35,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1479502634] [2021-11-21 00:01:35,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:35,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:35,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:35,513 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:35,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:01:35,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:35,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:01:35,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:35,716 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:01:35,716 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:01:35,716 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:35,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847532989] [2021-11-21 00:01:35,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:01:35,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479502634] [2021-11-21 00:01:35,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479502634] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:35,717 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:01:35,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:01:35,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095511849] [2021-11-21 00:01:35,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:35,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:01:35,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:35,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:01:35,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:01:35,720 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:01:35,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:35,803 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2021-11-21 00:01:35,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:01:35,804 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 29 [2021-11-21 00:01:35,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:35,809 INFO L225 Difference]: With dead ends: 58 [2021-11-21 00:01:35,809 INFO L226 Difference]: Without dead ends: 56 [2021-11-21 00:01:35,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:01:35,816 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 9 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:35,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 123 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:01:35,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-21 00:01:35,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2021-11-21 00:01:35,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 37 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:01:35,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-21 00:01:35,843 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 29 [2021-11-21 00:01:35,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:35,844 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-21 00:01:35,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:01:35,844 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-21 00:01:35,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:01:35,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:35,849 INFO L514 BasicCegarLoop]: trace histogram [4, 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 00:01:35,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:36,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:36,062 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:36,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:36,063 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2021-11-21 00:01:36,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:36,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199525557] [2021-11-21 00:01:36,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:36,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:36,075 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:01:36,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [695691018] [2021-11-21 00:01:36,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:36,075 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:36,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:36,076 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:36,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:01:36,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:36,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 00:01:36,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:36,276 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:01:36,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:36,506 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:01:36,506 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:36,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199525557] [2021-11-21 00:01:36,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:01:36,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695691018] [2021-11-21 00:01:36,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695691018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:01:36,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647471516] [2021-11-21 00:01:36,509 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-21 00:01:36,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:01:36,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:01:36,510 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:01:36,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:01:40,746 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-21 00:01:40,811 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:01:40,840 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:01:41,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1647471516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:01:41,992 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:01:41,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [6, 6] total 22 [2021-11-21 00:01:41,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275946792] [2021-11-21 00:01:41,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:01:41,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:01:41,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:41,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:01:41,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:01:41,994 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:01:42,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:01:42,448 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2021-11-21 00:01:42,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:01:42,449 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2021-11-21 00:01:42,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:01:42,451 INFO L225 Difference]: With dead ends: 96 [2021-11-21 00:01:42,451 INFO L226 Difference]: Without dead ends: 94 [2021-11-21 00:01:42,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:01:42,453 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 45 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:01:42,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 70 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:01:42,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-21 00:01:42,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2021-11-21 00:01:42,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-21 00:01:42,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2021-11-21 00:01:42,489 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2021-11-21 00:01:42,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:01:42,489 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2021-11-21 00:01:42,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:01:42,490 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2021-11-21 00:01:42,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:01:42,492 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:01:42,492 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:01:42,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:01:42,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:01:42,716 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:01:42,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:01:42,716 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2021-11-21 00:01:42,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:01:42,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481761790] [2021-11-21 00:01:42,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:42,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:01:42,728 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:01:42,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [680162075] [2021-11-21 00:01:42,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:01:42,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:01:42,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:01:42,732 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:01:42,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:01:42,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:01:42,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-21 00:01:42,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:43,548 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:01:43,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:46,397 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:01:46,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:01:46,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481761790] [2021-11-21 00:01:46,397 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:01:46,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680162075] [2021-11-21 00:01:46,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680162075] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:01:46,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1339387667] [2021-11-21 00:01:46,401 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 00:01:46,401 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:01:46,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:01:46,401 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:01:46,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:06:03,833 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:06:03,882 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:06:03,905 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:06:10,238 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:06:10,238 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:06:10,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 23 [2021-11-21 00:06:10,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108930669] [2021-11-21 00:06:10,239 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:06:10,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:06:10,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:06:10,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:06:10,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1706, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 00:06:10,241 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 23 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 00:06:19,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:19,065 INFO L93 Difference]: Finished difference Result 229 states and 326 transitions. [2021-11-21 00:06:19,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:06:19,066 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 51 [2021-11-21 00:06:19,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:19,070 INFO L225 Difference]: With dead ends: 229 [2021-11-21 00:06:19,070 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 00:06:19,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=675, Invalid=4875, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 00:06:19,073 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 150 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 710 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 1056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:19,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 285 Invalid, 1056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 710 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-21 00:06:19,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 00:06:19,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 140. [2021-11-21 00:06:19,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 89 states have (on average 1.202247191011236) internal successors, (107), 91 states have internal predecessors, (107), 41 states have call successors, (41), 9 states have call predecessors, (41), 9 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-21 00:06:19,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 188 transitions. [2021-11-21 00:06:19,130 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 188 transitions. Word has length 51 [2021-11-21 00:06:19,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:19,130 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 188 transitions. [2021-11-21 00:06:19,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 00:06:19,131 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 188 transitions. [2021-11-21 00:06:19,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:06:19,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:19,133 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:19,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:19,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:06:19,348 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:19,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:19,349 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2021-11-21 00:06:19,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:06:19,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64271106] [2021-11-21 00:06:19,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:19,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:06:19,370 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:06:19,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1975719772] [2021-11-21 00:06:19,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:19,370 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:06:19,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:06:19,371 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:06:19,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:06:19,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:19,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:06:19,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:19,520 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:06:19,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:06:19,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:06:19,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64271106] [2021-11-21 00:06:19,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:06:19,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975719772] [2021-11-21 00:06:19,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975719772] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:06:19,520 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:06:19,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:06:19,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827052918] [2021-11-21 00:06:19,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:06:19,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:06:19,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:06:19,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:06:19,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:06:19,522 INFO L87 Difference]: Start difference. First operand 140 states and 188 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:06:19,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:19,606 INFO L93 Difference]: Finished difference Result 236 states and 325 transitions. [2021-11-21 00:06:19,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:06:19,606 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2021-11-21 00:06:19,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:19,609 INFO L225 Difference]: With dead ends: 236 [2021-11-21 00:06:19,609 INFO L226 Difference]: Without dead ends: 170 [2021-11-21 00:06:19,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:06:19,611 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:19,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 90 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:06:19,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-21 00:06:19,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 165. [2021-11-21 00:06:19,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 102 states have (on average 1.2058823529411764) internal successors, (123), 103 states have internal predecessors, (123), 53 states have call successors, (53), 9 states have call predecessors, (53), 9 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2021-11-21 00:06:19,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 228 transitions. [2021-11-21 00:06:19,665 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 228 transitions. Word has length 54 [2021-11-21 00:06:19,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:19,665 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 228 transitions. [2021-11-21 00:06:19,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:06:19,666 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 228 transitions. [2021-11-21 00:06:19,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 00:06:19,668 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:19,668 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 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] [2021-11-21 00:06:19,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:19,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:06:19,883 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:19,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:19,883 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2021-11-21 00:06:19,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:06:19,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980826739] [2021-11-21 00:06:19,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:19,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:06:19,892 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:06:19,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [860833444] [2021-11-21 00:06:19,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:19,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:06:19,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:06:19,894 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:06:19,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:06:19,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:06:19,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 00:06:19,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:20,112 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:06:20,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:20,272 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:06:20,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:06:20,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980826739] [2021-11-21 00:06:20,272 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:06:20,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860833444] [2021-11-21 00:06:20,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860833444] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:06:20,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704733293] [2021-11-21 00:06:20,275 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 00:06:20,275 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:06:20,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:06:20,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:06:20,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:06:50,253 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 00:06:50,343 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:06:50,373 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:06:51,369 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:06:51,369 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:06:51,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-11-21 00:06:51,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066546236] [2021-11-21 00:06:51,370 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:06:51,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:06:51,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:06:51,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:06:51,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:06:51,372 INFO L87 Difference]: Start difference. First operand 165 states and 228 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-21 00:06:51,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:06:51,571 INFO L93 Difference]: Finished difference Result 228 states and 318 transitions. [2021-11-21 00:06:51,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:06:51,572 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 61 [2021-11-21 00:06:51,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:06:51,574 INFO L225 Difference]: With dead ends: 228 [2021-11-21 00:06:51,574 INFO L226 Difference]: Without dead ends: 226 [2021-11-21 00:06:51,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:06:51,576 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 22 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:06:51,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 207 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:06:51,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-21 00:06:51,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 177. [2021-11-21 00:06:51,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 111 states have (on average 1.1891891891891893) internal successors, (132), 112 states have internal predecessors, (132), 53 states have call successors, (53), 12 states have call predecessors, (53), 12 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2021-11-21 00:06:51,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 237 transitions. [2021-11-21 00:06:51,627 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 237 transitions. Word has length 61 [2021-11-21 00:06:51,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:06:51,628 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 237 transitions. [2021-11-21 00:06:51,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-21 00:06:51,628 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 237 transitions. [2021-11-21 00:06:51,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 00:06:51,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:06:51,630 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:06:51,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:06:51,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:06:51,838 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:06:51,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:06:51,839 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2021-11-21 00:06:51,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:06:51,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168330788] [2021-11-21 00:06:51,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:06:51,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:06:51,845 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:06:51,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [875470751] [2021-11-21 00:06:51,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:06:51,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:06:51,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:06:51,863 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:06:51,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:06:51,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:06:51,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:06:51,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:06:51,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:06:52,487 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:06:52,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:06:53,204 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:06:53,204 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:06:53,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168330788] [2021-11-21 00:06:53,204 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:06:53,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875470751] [2021-11-21 00:06:53,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875470751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:06:53,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1144101393] [2021-11-21 00:06:53,207 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 00:06:53,207 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:06:53,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:06:53,208 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:06:53,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:07:22,137 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:07:22,186 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:07:22,209 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:07:23,862 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:07:23,862 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:07:23,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2021-11-21 00:07:23,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218559501] [2021-11-21 00:07:23,863 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:07:23,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 00:07:23,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:07:23,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 00:07:23,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1533, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:07:23,865 INFO L87 Difference]: Start difference. First operand 177 states and 237 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:07:33,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:33,303 INFO L93 Difference]: Finished difference Result 454 states and 640 transitions. [2021-11-21 00:07:33,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:07:33,304 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2021-11-21 00:07:33,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:33,306 INFO L225 Difference]: With dead ends: 454 [2021-11-21 00:07:33,307 INFO L226 Difference]: Without dead ends: 397 [2021-11-21 00:07:33,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=640, Invalid=4330, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 00:07:33,310 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 212 mSDsluCounter, 491 mSDsCounter, 0 mSdLazyCounter, 825 mSolverCounterSat, 349 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 557 SdHoareTripleChecker+Invalid, 1174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 349 IncrementalHoareTripleChecker+Valid, 825 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:33,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 557 Invalid, 1174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [349 Valid, 825 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-21 00:07:33,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-21 00:07:33,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 265. [2021-11-21 00:07:33,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 172 states have (on average 1.2093023255813953) internal successors, (208), 173 states have internal predecessors, (208), 77 states have call successors, (77), 15 states have call predecessors, (77), 15 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2021-11-21 00:07:33,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 361 transitions. [2021-11-21 00:07:33,400 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 361 transitions. Word has length 59 [2021-11-21 00:07:33,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:33,401 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 361 transitions. [2021-11-21 00:07:33,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:07:33,401 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 361 transitions. [2021-11-21 00:07:33,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 00:07:33,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:33,403 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:33,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:07:33,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:07:33,605 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:33,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:33,605 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2021-11-21 00:07:33,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:07:33,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349378455] [2021-11-21 00:07:33,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:33,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:07:33,611 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:07:33,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1867419837] [2021-11-21 00:07:33,612 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:07:33,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:07:33,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:07:33,615 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:07:33,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:07:33,656 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:07:33,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:07:33,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:07:33,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:07:33,797 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:07:33,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:07:33,985 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:07:33,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349378455] [2021-11-21 00:07:33,985 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:07:33,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867419837] [2021-11-21 00:07:33,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867419837] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:07:33,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398181537] [2021-11-21 00:07:33,987 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 00:07:33,987 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:07:33,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:07:33,988 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:07:33,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:07:56,246 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 00:07:56,333 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:07:56,363 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:07:58,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:07:58,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:07:58,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-21 00:07:58,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9780534] [2021-11-21 00:07:58,221 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:07:58,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:07:58,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:07:58,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:07:58,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=904, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:07:58,222 INFO L87 Difference]: Start difference. First operand 265 states and 361 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:07:58,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:58,756 INFO L93 Difference]: Finished difference Result 378 states and 527 transitions. [2021-11-21 00:07:58,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:07:58,757 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2021-11-21 00:07:58,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:58,760 INFO L225 Difference]: With dead ends: 378 [2021-11-21 00:07:58,760 INFO L226 Difference]: Without dead ends: 286 [2021-11-21 00:07:58,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=267, Invalid=1713, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:07:58,762 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 37 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:58,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 259 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:07:58,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-21 00:07:58,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 240. [2021-11-21 00:07:58,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 155 states have (on average 1.1612903225806452) internal successors, (180), 156 states have internal predecessors, (180), 69 states have call successors, (69), 15 states have call predecessors, (69), 15 states have return successors, (68), 68 states have call predecessors, (68), 68 states have call successors, (68) [2021-11-21 00:07:58,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 317 transitions. [2021-11-21 00:07:58,836 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 317 transitions. Word has length 59 [2021-11-21 00:07:58,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:58,836 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 317 transitions. [2021-11-21 00:07:58,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 00:07:58,837 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 317 transitions. [2021-11-21 00:07:58,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:07:58,838 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:58,838 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:58,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:07:59,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:07:59,038 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:59,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:59,039 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2021-11-21 00:07:59,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:07:59,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733280044] [2021-11-21 00:07:59,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:59,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:07:59,052 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:07:59,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1489714483] [2021-11-21 00:07:59,053 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:07:59,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:07:59,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:07:59,072 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:07:59,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:07:59,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:07:59,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:07:59,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:07:59,291 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-21 00:07:59,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:59,407 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:07:59,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:07:59,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733280044] [2021-11-21 00:07:59,408 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:07:59,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489714483] [2021-11-21 00:07:59,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489714483] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:07:59,408 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:07:59,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 00:07:59,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827691643] [2021-11-21 00:07:59,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:07:59,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:07:59,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:07:59,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:07:59,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:07:59,409 INFO L87 Difference]: Start difference. First operand 240 states and 317 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:07:59,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:59,527 INFO L93 Difference]: Finished difference Result 289 states and 395 transitions. [2021-11-21 00:07:59,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:07:59,527 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2021-11-21 00:07:59,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:59,529 INFO L225 Difference]: With dead ends: 289 [2021-11-21 00:07:59,530 INFO L226 Difference]: Without dead ends: 287 [2021-11-21 00:07:59,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 118 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 00:07:59,531 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:59,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 115 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:07:59,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-21 00:07:59,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 280. [2021-11-21 00:07:59,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 170 states have (on average 1.1823529411764706) internal successors, (201), 171 states have internal predecessors, (201), 93 states have call successors, (93), 16 states have call predecessors, (93), 16 states have return successors, (92), 92 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-21 00:07:59,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 386 transitions. [2021-11-21 00:07:59,651 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 386 transitions. Word has length 64 [2021-11-21 00:07:59,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:59,652 INFO L470 AbstractCegarLoop]: Abstraction has 280 states and 386 transitions. [2021-11-21 00:07:59,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:07:59,652 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 386 transitions. [2021-11-21 00:07:59,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:07:59,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:59,653 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:59,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:07:59,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:07:59,868 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:59,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:59,868 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2021-11-21 00:07:59,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:07:59,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514107202] [2021-11-21 00:07:59,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:59,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:07:59,877 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:07:59,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [839417221] [2021-11-21 00:07:59,877 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:07:59,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:07:59,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:07:59,878 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:07:59,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:07:59,923 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:07:59,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:07:59,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-21 00:07:59,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:08:00,521 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:08:00,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:08:04,398 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:08:04,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:08:04,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514107202] [2021-11-21 00:08:04,399 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:08:04,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839417221] [2021-11-21 00:08:04,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839417221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:08:04,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [199042747] [2021-11-21 00:08:04,402 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 00:08:04,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:08:04,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:08:04,403 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:08:04,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:29,634 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:13:29,680 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:13:29,702 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:34,364 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:34,364 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:13:34,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-21 00:13:34,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786183049] [2021-11-21 00:13:34,365 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:34,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 00:13:34,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:34,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 00:13:34,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1562, Unknown=1, NotChecked=0, Total=1722 [2021-11-21 00:13:34,367 INFO L87 Difference]: Start difference. First operand 280 states and 386 transitions. Second operand has 22 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-21 00:13:38,786 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 00:13:40,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:40,857 INFO L93 Difference]: Finished difference Result 321 states and 447 transitions. [2021-11-21 00:13:40,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:13:40,858 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 64 [2021-11-21 00:13:40,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:40,860 INFO L225 Difference]: With dead ends: 321 [2021-11-21 00:13:40,861 INFO L226 Difference]: Without dead ends: 317 [2021-11-21 00:13:40,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 874 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=399, Invalid=3260, Unknown=1, NotChecked=0, Total=3660 [2021-11-21 00:13:40,863 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 125 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 707 mSolverCounterSat, 235 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 707 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 357 Invalid, 943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 707 Invalid, 1 Unknown, 0 Unchecked, 5.2s Time] [2021-11-21 00:13:40,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-21 00:13:40,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 282. [2021-11-21 00:13:40,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 172 states have (on average 1.1744186046511629) internal successors, (202), 172 states have internal predecessors, (202), 93 states have call successors, (93), 17 states have call predecessors, (93), 16 states have return successors, (92), 92 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-21 00:13:40,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 387 transitions. [2021-11-21 00:13:40,977 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 387 transitions. Word has length 64 [2021-11-21 00:13:40,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,977 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 387 transitions. [2021-11-21 00:13:40,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-21 00:13:40,978 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 387 transitions. [2021-11-21 00:13:40,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-21 00:13:40,980 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,980 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:41,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:41,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:41,196 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:41,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:41,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2021-11-21 00:13:41,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:41,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402279664] [2021-11-21 00:13:41,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:41,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:41,205 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:13:41,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [230144538] [2021-11-21 00:13:41,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:41,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:41,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:41,220 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:41,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5cbcf92a-fa0f-4890-8f70-412664ae11bc/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:13:41,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:41,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-21 00:13:41,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:42,233 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 51 proven. 32 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-21 00:13:42,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:45,558 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 61 proven. 17 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 00:13:45,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:45,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402279664] [2021-11-21 00:13:45,558 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:13:45,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230144538] [2021-11-21 00:13:45,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230144538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:45,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833878490] [2021-11-21 00:13:45,560 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 00:13:45,561 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:45,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:45,561 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:45,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:11,450 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 00:14:11,514 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 00:14:11,537 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:15,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:15,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:14:15,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2021-11-21 00:14:15,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476538009] [2021-11-21 00:14:15,875 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:15,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:14:15,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:15,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:14:15,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 00:14:15,877 INFO L87 Difference]: Start difference. First operand 282 states and 387 transitions. Second operand has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-21 00:14:25,185 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:14:28,647 WARN L515 Checker$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 00:14:34,663 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 00:14:38,459 WARN L515 Checker$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 00:14:42,895 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []