./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ab50d4c44616d850baf388e04d7eb1063c3cea27d21c9cbb628b158ef2bdff42 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:48:50,679 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:48:50,681 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:48:50,710 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:48:50,711 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:48:50,713 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:48:50,714 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:48:50,717 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:48:50,719 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:48:50,720 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:48:50,721 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:48:50,723 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:48:50,723 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:48:50,724 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:48:50,726 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:48:50,727 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:48:50,729 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:48:50,730 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:48:50,732 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:48:50,734 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:48:50,736 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:48:50,737 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:48:50,739 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:48:50,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:48:50,743 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:48:50,744 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:48:50,744 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:48:50,745 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:48:50,746 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:48:50,747 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:48:50,748 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:48:50,749 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:48:50,750 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:48:50,751 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:48:50,752 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:48:50,752 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:48:50,753 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:48:50,753 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:48:50,754 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:48:50,755 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:48:50,755 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:48:50,756 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:48:50,784 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:48:50,786 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:48:50,787 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:48:50,787 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:48:50,788 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:48:50,794 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:48:50,795 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:48:50,795 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:48:50,795 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:48:50,795 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:48:50,796 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:48:50,797 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:48:50,797 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:48:50,797 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:48:50,797 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:48:50,798 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:48:50,798 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:48:50,798 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:48:50,799 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:48:50,799 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:48:50,799 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:48:50,800 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:48:50,800 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:48:50,800 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:48:50,800 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:48:50,801 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:48:50,801 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:48:50,801 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:48:50,801 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:48:50,802 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:48:50,802 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:48:50,802 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:48:50,802 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:48:50,803 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:48:50,803 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:48:50,803 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:48:50,803 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:48:50,804 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:48:50,804 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:48:50,804 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:48:50,804 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:48:50,805 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_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ab50d4c44616d850baf388e04d7eb1063c3cea27d21c9cbb628b158ef2bdff42 [2021-11-25 17:48:51,058 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:48:51,079 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:48:51,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:48:51,083 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:48:51,083 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:48:51,085 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c [2021-11-25 17:48:51,151 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/data/a72fd5ac1/cfb38a0980b84d9c8605f4456d9aafa4/FLAGbbed2f4da [2021-11-25 17:48:51,667 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:48:51,671 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c [2021-11-25 17:48:51,683 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/data/a72fd5ac1/cfb38a0980b84d9c8605f4456d9aafa4/FLAGbbed2f4da [2021-11-25 17:48:52,030 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/data/a72fd5ac1/cfb38a0980b84d9c8605f4456d9aafa4 [2021-11-25 17:48:52,035 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:48:52,038 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:48:52,043 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:48:52,044 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:48:52,049 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:48:52,049 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,052 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bf7b79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52, skipping insertion in model container [2021-11-25 17:48:52,053 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,060 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:48:52,080 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:48:52,264 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_3ccf175b-2169-4c4e-87ff-77256aae5d28/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c[490,503] [2021-11-25 17:48:52,285 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:48:52,293 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:48:52,305 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_3ccf175b-2169-4c4e-87ff-77256aae5d28/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c[490,503] [2021-11-25 17:48:52,324 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:48:52,336 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:48:52,336 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52 WrapperNode [2021-11-25 17:48:52,336 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:48:52,338 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:48:52,338 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:48:52,338 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:48:52,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,352 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,373 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-25 17:48:52,374 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:48:52,375 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:48:52,375 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:48:52,375 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:48:52,385 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,386 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,392 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,392 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,410 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,417 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,420 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,422 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:48:52,429 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:48:52,429 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:48:52,429 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:48:52,430 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (1/1) ... [2021-11-25 17:48:52,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:48:52,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:52,467 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:48:52,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:48:52,503 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:48:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 17:48:52,508 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 17:48:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:48:52,508 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:48:52,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:48:52,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:48:52,509 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:48:52,584 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:48:52,587 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:48:52,809 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:48:52,830 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:48:52,830 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 17:48:52,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:48:52 BoogieIcfgContainer [2021-11-25 17:48:52,833 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:48:52,835 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:48:52,835 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:48:52,839 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:48:52,839 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:48:52" (1/3) ... [2021-11-25 17:48:52,840 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d0bf12f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:48:52, skipping insertion in model container [2021-11-25 17:48:52,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:52" (2/3) ... [2021-11-25 17:48:52,841 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d0bf12f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:48:52, skipping insertion in model container [2021-11-25 17:48:52,841 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:48:52" (3/3) ... [2021-11-25 17:48:52,842 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound5.c [2021-11-25 17:48:52,847 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:48:52,848 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:48:52,914 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:48:52,924 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:48:52,936 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:48:52,956 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:48:52,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 17:48:52,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:52,963 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:52,964 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:52,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:52,977 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-25 17:48:52,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:52,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341844792] [2021-11-25 17:48:52,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:52,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:53,129 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:53,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1256750544] [2021-11-25 17:48:53,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:53,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:53,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:53,134 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:53,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:48:53,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:53,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 17:48:53,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 17:48:53,369 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:48:53,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:53,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341844792] [2021-11-25 17:48:53,370 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:48:53,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256750544] [2021-11-25 17:48:53,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256750544] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:53,371 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:48:53,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:48:53,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860319500] [2021-11-25 17:48:53,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:53,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 17:48:53,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:53,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 17:48:53,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 17:48:53,432 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 17:48:53,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:53,464 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-25 17:48:53,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 17:48:53,466 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2021-11-25 17:48:53,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:53,474 INFO L225 Difference]: With dead ends: 49 [2021-11-25 17:48:53,475 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 17:48:53,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 17:48:53,482 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:53,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:48:53,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 17:48:53,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 17:48:53,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:48:53,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-25 17:48:53,524 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-25 17:48:53,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:53,525 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-25 17:48:53,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 17:48:53,526 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-25 17:48:53,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 17:48:53,528 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:53,528 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:53,560 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 17:48:53,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 17:48:53,753 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:53,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:53,754 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-25 17:48:53,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:53,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383136755] [2021-11-25 17:48:53,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:53,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:53,773 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:53,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1321498845] [2021-11-25 17:48:53,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:53,774 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:53,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:53,775 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:53,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:48:53,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:53,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:48:53,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:53,972 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:48:53,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:48:54,127 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:48:54,127 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:54,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383136755] [2021-11-25 17:48:54,128 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:48:54,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321498845] [2021-11-25 17:48:54,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321498845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:48:54,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425316410] [2021-11-25 17:48:54,169 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 17:48:54,169 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:48:54,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:48:54,179 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:48:54,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:48:55,475 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:48:55,498 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:48:56,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [425316410] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:56,431 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:48:56,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-25 17:48:56,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588606241] [2021-11-25 17:48:56,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:56,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:48:56,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:56,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:48:56,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:48:56,434 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 17:48:56,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:56,661 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-25 17:48:56,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 17:48:56,662 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2021-11-25 17:48:56,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:56,664 INFO L225 Difference]: With dead ends: 38 [2021-11-25 17:48:56,665 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 17:48:56,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:48:56,670 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:56,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 48 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:48:56,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 17:48:56,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 17:48:56,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:48:56,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-25 17:48:56,700 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-25 17:48:56,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:56,700 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-25 17:48:56,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 17:48:56,701 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-25 17:48:56,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 17:48:56,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:56,703 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:56,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:56,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:56,925 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:56,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:56,926 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-25 17:48:56,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:56,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963946712] [2021-11-25 17:48:56,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:56,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:56,945 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:56,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [805329518] [2021-11-25 17:48:56,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:56,946 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:56,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:56,949 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:56,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:48:57,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:57,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:48:57,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:57,175 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:48:57,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:48:57,271 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 17:48:57,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:57,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963946712] [2021-11-25 17:48:57,271 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:48:57,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805329518] [2021-11-25 17:48:57,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805329518] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:48:57,272 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:48:57,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 17:48:57,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437635541] [2021-11-25 17:48:57,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:57,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:48:57,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:57,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:48:57,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:48:57,274 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 17:48:57,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:57,374 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-25 17:48:57,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:48:57,375 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2021-11-25 17:48:57,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:57,376 INFO L225 Difference]: With dead ends: 36 [2021-11-25 17:48:57,376 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 17:48:57,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:48:57,378 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:57,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:48:57,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 17:48:57,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-25 17:48:57,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:48:57,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-25 17:48:57,390 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-25 17:48:57,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:57,391 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-25 17:48:57,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 17:48:57,391 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-25 17:48:57,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 17:48:57,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:57,393 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:57,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:57,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:57,609 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:57,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:57,610 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-25 17:48:57,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:57,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076897032] [2021-11-25 17:48:57,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:57,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:57,648 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:57,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1143561909] [2021-11-25 17:48:57,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:57,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:57,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:57,653 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:57,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:48:57,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:57,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 17:48:57,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:57,937 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 17:48:57,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:48:58,057 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 17:48:58,058 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:58,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076897032] [2021-11-25 17:48:58,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:48:58,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143561909] [2021-11-25 17:48:58,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143561909] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:48:58,059 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:48:58,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 17:48:58,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617685418] [2021-11-25 17:48:58,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:58,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:48:58,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:58,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:48:58,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:48:58,061 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:48:58,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:58,110 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-25 17:48:58,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:48:58,111 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2021-11-25 17:48:58,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:58,112 INFO L225 Difference]: With dead ends: 47 [2021-11-25 17:48:58,113 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 17:48:58,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:48:58,114 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:58,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:48:58,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 17:48:58,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-25 17:48:58,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 17:48:58,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-25 17:48:58,129 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-25 17:48:58,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:58,129 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-25 17:48:58,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:48:58,130 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-25 17:48:58,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 17:48:58,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:58,131 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:58,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:58,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:58,349 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:58,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:58,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-25 17:48:58,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:58,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612028534] [2021-11-25 17:48:58,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:58,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:58,363 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:58,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [64085654] [2021-11-25 17:48:58,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:58,364 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:58,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:58,365 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:58,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:48:58,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:58,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:48:58,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:58,590 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 17:48:58,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:48:58,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:58,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612028534] [2021-11-25 17:48:58,643 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:48:58,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64085654] [2021-11-25 17:48:58,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64085654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:48:58,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1161176319] [2021-11-25 17:48:58,646 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 17:48:58,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:48:58,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:48:58,648 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:48:58,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:48:59,808 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 17:48:59,824 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:48:59,846 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:49:01,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1161176319] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:49:01,176 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:49:01,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-25 17:49:01,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819954485] [2021-11-25 17:49:01,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:49:01,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 17:49:01,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:49:01,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 17:49:01,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:49:01,179 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 17:49:01,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:49:01,519 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-25 17:49:01,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 17:49:01,520 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2021-11-25 17:49:01,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:49:01,522 INFO L225 Difference]: With dead ends: 65 [2021-11-25 17:49:01,522 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 17:49:01,523 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:49:01,524 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 42 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:49:01,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 47 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 17:49:01,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 17:49:01,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-25 17:49:01,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 17:49:01,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-25 17:49:01,543 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-25 17:49:01,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:49:01,544 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-25 17:49:01,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 17:49:01,544 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-25 17:49:01,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 17:49:01,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:49:01,546 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:49:01,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 17:49:01,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:49:01,749 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:49:01,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:49:01,750 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-25 17:49:01,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:49:01,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34574641] [2021-11-25 17:49:01,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:01,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:49:01,769 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:49:01,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1221896823] [2021-11-25 17:49:01,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:01,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:49:01,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:49:01,770 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:49:01,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 17:49:01,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:49:01,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:49:01,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:49:01,945 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 17:49:01,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:49:02,067 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 17:49:02,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:49:02,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34574641] [2021-11-25 17:49:02,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:49:02,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221896823] [2021-11-25 17:49:02,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221896823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:49:02,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419336324] [2021-11-25 17:49:02,082 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 17:49:02,082 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:49:02,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:49:02,083 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:49:02,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:49:18,468 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 17:49:18,473 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:49:18,486 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:49:21,066 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1775#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:49:21,067 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:49:21,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:49:21,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-11-25 17:49:21,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618961290] [2021-11-25 17:49:21,067 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:49:21,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:49:21,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:49:21,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:49:21,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-25 17:49:21,069 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 17:49:21,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:49:21,262 INFO L93 Difference]: Finished difference Result 103 states and 142 transitions. [2021-11-25 17:49:21,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:49:21,262 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2021-11-25 17:49:21,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:49:21,264 INFO L225 Difference]: With dead ends: 103 [2021-11-25 17:49:21,264 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 17:49:21,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2021-11-25 17:49:21,266 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 28 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:49:21,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 239 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:49:21,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 17:49:21,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 86. [2021-11-25 17:49:21,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 47 states have internal predecessors, (55), 32 states have call successors, (32), 7 states have call predecessors, (32), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-25 17:49:21,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2021-11-25 17:49:21,289 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 52 [2021-11-25 17:49:21,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:49:21,289 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2021-11-25 17:49:21,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 17:49:21,290 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2021-11-25 17:49:21,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 17:49:21,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:49:21,291 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:49:21,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 17:49:21,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 17:49:21,493 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:49:21,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:49:21,494 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2021-11-25 17:49:21,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:49:21,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739931136] [2021-11-25 17:49:21,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:21,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:49:21,507 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:49:21,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1356719387] [2021-11-25 17:49:21,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:21,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:49:21,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:49:21,509 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:49:21,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 17:49:21,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:49:21,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:49:21,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:49:21,671 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 17:49:21,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:49:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 17:49:21,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:49:21,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739931136] [2021-11-25 17:49:21,856 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:49:21,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356719387] [2021-11-25 17:49:21,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356719387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:49:21,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906841861] [2021-11-25 17:49:21,861 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 17:49:21,861 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:49:21,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:49:21,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:49:21,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:49:34,802 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 17:49:34,815 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:49:34,827 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:49:38,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1906841861] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:49:38,716 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:49:38,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [8, 8] total 24 [2021-11-25 17:49:38,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354124946] [2021-11-25 17:49:38,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:49:38,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 17:49:38,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:49:38,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 17:49:38,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-25 17:49:38,718 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 17:49:39,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:49:39,955 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2021-11-25 17:49:39,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 17:49:39,956 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 58 [2021-11-25 17:49:39,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:49:39,958 INFO L225 Difference]: With dead ends: 105 [2021-11-25 17:49:39,958 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 17:49:39,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 133 SyntacticMatches, 17 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=162, Invalid=540, Unknown=0, NotChecked=0, Total=702 [2021-11-25 17:49:39,960 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 74 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:49:39,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 50 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:49:39,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 17:49:39,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-25 17:49:39,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 57 states have (on average 1.1754385964912282) internal successors, (67), 58 states have internal predecessors, (67), 36 states have call successors, (36), 9 states have call predecessors, (36), 9 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 17:49:39,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 138 transitions. [2021-11-25 17:49:39,985 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 138 transitions. Word has length 58 [2021-11-25 17:49:39,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:49:39,986 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 138 transitions. [2021-11-25 17:49:39,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 17:49:39,986 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 138 transitions. [2021-11-25 17:49:39,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 17:49:39,988 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:49:39,988 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:49:40,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 17:49:40,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 17:49:40,192 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:49:40,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:49:40,192 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-25 17:49:40,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:49:40,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202345605] [2021-11-25 17:49:40,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:40,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:49:40,200 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:49:40,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [886767664] [2021-11-25 17:49:40,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:40,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:49:40,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:49:40,207 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:49:40,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 17:49:40,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:49:40,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:49:40,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:49:40,360 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 17:49:40,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:49:40,497 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 17:49:40,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:49:40,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202345605] [2021-11-25 17:49:40,497 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:49:40,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886767664] [2021-11-25 17:49:40,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886767664] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:49:40,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317742611] [2021-11-25 17:49:40,500 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 17:49:40,500 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:49:40,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:49:40,500 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:49:40,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:49:46,613 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-25 17:49:46,695 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:49:46,707 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:49:49,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3154#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:49:49,957 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:49:49,957 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:49:49,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 17:49:49,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630575516] [2021-11-25 17:49:49,957 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:49:49,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:49:49,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:49:49,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:49:49,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2021-11-25 17:49:49,959 INFO L87 Difference]: Start difference. First operand 103 states and 138 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 17:49:50,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:49:50,138 INFO L93 Difference]: Finished difference Result 117 states and 153 transitions. [2021-11-25 17:49:50,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:49:50,138 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 60 [2021-11-25 17:49:50,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:49:50,151 INFO L225 Difference]: With dead ends: 117 [2021-11-25 17:49:50,151 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 17:49:50,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 143 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=140, Invalid=672, Unknown=0, NotChecked=0, Total=812 [2021-11-25 17:49:50,153 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:49:50,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 93 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:49:50,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 17:49:50,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-25 17:49:50,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 64 states have (on average 1.15625) internal successors, (74), 66 states have internal predecessors, (74), 39 states have call successors, (39), 11 states have call predecessors, (39), 11 states have return successors, (38), 37 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-25 17:49:50,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 151 transitions. [2021-11-25 17:49:50,204 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 151 transitions. Word has length 60 [2021-11-25 17:49:50,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:49:50,204 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 151 transitions. [2021-11-25 17:49:50,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 17:49:50,205 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 151 transitions. [2021-11-25 17:49:50,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:49:50,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:49:50,213 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:49:50,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 17:49:50,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:49:50,429 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:49:50,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:49:50,429 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-25 17:49:50,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:49:50,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233974487] [2021-11-25 17:49:50,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:49:50,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:49:50,443 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:49:50,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [180843497] [2021-11-25 17:49:50,444 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:49:50,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:49:50,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:49:50,449 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:49:50,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 17:49:50,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 17:49:50,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:49:50,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:49:50,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:49:50,674 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 17:49:50,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:49:50,822 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 17:49:50,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:49:50,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233974487] [2021-11-25 17:49:50,822 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:49:50,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180843497] [2021-11-25 17:49:50,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180843497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:49:50,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057284973] [2021-11-25 17:49:50,825 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 17:49:50,825 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:49:50,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:49:50,825 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:49:50,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:49:56,494 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-25 17:49:56,577 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:49:56,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:50:01,500 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3927#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:50:01,500 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:50:01,500 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:50:01,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 17:50:01,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312485630] [2021-11-25 17:50:01,500 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:50:01,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:50:01,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:01,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:50:01,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2021-11-25 17:50:01,502 INFO L87 Difference]: Start difference. First operand 115 states and 151 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-25 17:50:01,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:01,616 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2021-11-25 17:50:01,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:50:01,621 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2021-11-25 17:50:01,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:01,622 INFO L225 Difference]: With dead ends: 122 [2021-11-25 17:50:01,623 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 17:50:01,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 157 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2021-11-25 17:50:01,624 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:01,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 128 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:01,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 17:50:01,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-11-25 17:50:01,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 67 states have (on average 1.1492537313432836) internal successors, (77), 69 states have internal predecessors, (77), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-25 17:50:01,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2021-11-25 17:50:01,651 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 65 [2021-11-25 17:50:01,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:01,652 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2021-11-25 17:50:01,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-25 17:50:01,652 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2021-11-25 17:50:01,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 17:50:01,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:01,654 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:01,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 17:50:01,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:01,871 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:01,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:01,871 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-25 17:50:01,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:01,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964737282] [2021-11-25 17:50:01,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:01,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:01,882 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:50:01,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1616039953] [2021-11-25 17:50:01,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:01,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:01,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:01,888 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:01,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 17:50:01,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:01,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 17:50:01,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:02,505 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-25 17:50:02,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:50:03,190 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-25 17:50:03,190 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:03,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964737282] [2021-11-25 17:50:03,190 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:50:03,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616039953] [2021-11-25 17:50:03,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616039953] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:50:03,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [411624476] [2021-11-25 17:50:03,193 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 17:50:03,193 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:50:03,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:50:03,194 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:50:03,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:50:10,196 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 17:50:10,199 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:50:10,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:50:37,663 WARN L227 SmtUtils]: Spent 24.49s on a formula simplification. DAG size of input: 183 DAG size of output: 150 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:51:01,144 WARN L227 SmtUtils]: Spent 12.61s on a formula simplification. DAG size of input: 84 DAG size of output: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:51:28,023 WARN L227 SmtUtils]: Spent 23.80s on a formula simplification. DAG size of input: 181 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:51:28,024 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4775#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 17:51:28,024 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:51:28,024 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:51:28,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-25 17:51:28,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225413968] [2021-11-25 17:51:28,025 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:51:28,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 17:51:28,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:28,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 17:51:28,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 17:51:28,027 INFO L87 Difference]: Start difference. First operand 120 states and 156 transitions. Second operand has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 17:51:36,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:36,739 INFO L93 Difference]: Finished difference Result 203 states and 282 transitions. [2021-11-25 17:51:36,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 17:51:36,739 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 74 [2021-11-25 17:51:36,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:36,741 INFO L225 Difference]: With dead ends: 203 [2021-11-25 17:51:36,742 INFO L226 Difference]: Without dead ends: 201 [2021-11-25 17:51:36,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 182 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 82.9s TimeCoverageRelationStatistics Valid=407, Invalid=2563, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 17:51:36,744 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 65 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:36,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 426 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-25 17:51:36,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-25 17:51:36,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 191. [2021-11-25 17:51:36,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 104 states have internal predecessors, (124), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 71 states have call predecessors, (72), 72 states have call successors, (72) [2021-11-25 17:51:36,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 269 transitions. [2021-11-25 17:51:36,795 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 269 transitions. Word has length 74 [2021-11-25 17:51:36,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:36,795 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 269 transitions. [2021-11-25 17:51:36,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 17:51:36,796 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 269 transitions. [2021-11-25 17:51:36,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 17:51:36,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:36,797 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:36,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 17:51:37,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 17:51:37,001 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:37,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:37,002 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-25 17:51:37,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:37,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060418277] [2021-11-25 17:51:37,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:37,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:37,013 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:51:37,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1177774614] [2021-11-25 17:51:37,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:37,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:51:37,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:51:37,014 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:51:37,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 17:51:37,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:37,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 17:51:37,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:51:37,415 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-25 17:51:37,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:51:37,622 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-25 17:51:37,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:37,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060418277] [2021-11-25 17:51:37,622 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:51:37,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177774614] [2021-11-25 17:51:37,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177774614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:51:37,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140636825] [2021-11-25 17:51:37,625 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 17:51:37,625 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:51:37,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:51:37,625 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:51:37,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:51:45,859 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 17:51:45,862 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:51:45,875 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:52:13,434 WARN L227 SmtUtils]: Spent 23.21s on a formula simplification. DAG size of input: 183 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:52:32,894 WARN L227 SmtUtils]: Spent 12.39s on a formula simplification. DAG size of input: 84 DAG size of output: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:52:56,202 WARN L227 SmtUtils]: Spent 21.62s on a formula simplification. DAG size of input: 181 DAG size of output: 89 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:52:56,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5938#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 17:52:56,498 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:52:56,498 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:52:56,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-25 17:52:56,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646284282] [2021-11-25 17:52:56,499 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:52:56,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 17:52:56,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:52:56,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 17:52:56,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1025, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 17:52:56,501 INFO L87 Difference]: Start difference. First operand 191 states and 269 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 17:52:58,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:52:58,249 INFO L93 Difference]: Finished difference Result 224 states and 306 transitions. [2021-11-25 17:52:58,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 17:52:58,249 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 79 [2021-11-25 17:52:58,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:52:58,251 INFO L225 Difference]: With dead ends: 224 [2021-11-25 17:52:58,252 INFO L226 Difference]: Without dead ends: 218 [2021-11-25 17:52:58,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 202 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 71.1s TimeCoverageRelationStatistics Valid=233, Invalid=1573, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 17:52:58,254 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 42 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 395 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:52:58,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 262 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 395 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 17:52:58,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-11-25 17:52:58,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 216. [2021-11-25 17:52:58,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 122 states have (on average 1.1639344262295082) internal successors, (142), 125 states have internal predecessors, (142), 75 states have call successors, (75), 18 states have call predecessors, (75), 18 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-25 17:52:58,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 291 transitions. [2021-11-25 17:52:58,317 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 291 transitions. Word has length 79 [2021-11-25 17:52:58,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:52:58,317 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 291 transitions. [2021-11-25 17:52:58,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 17:52:58,318 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 291 transitions. [2021-11-25 17:52:58,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 17:52:58,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:52:58,320 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:52:58,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 17:52:58,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 17:52:58,537 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:52:58,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:52:58,537 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-25 17:52:58,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:52:58,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577473185] [2021-11-25 17:52:58,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:52:58,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:52:58,549 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:52:58,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [723144776] [2021-11-25 17:52:58,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:52:58,549 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:52:58,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:52:58,565 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:52:58,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 17:52:58,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:52:58,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 17:52:58,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:52:59,436 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 17:52:59,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:53:04,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:53:04,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577473185] [2021-11-25 17:53:04,657 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:53:04,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723144776] [2021-11-25 17:53:04,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723144776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:53:04,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1987583983] [2021-11-25 17:53:04,659 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 17:53:04,659 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:53:04,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:53:04,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:53:04,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:53:09,909 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-25 17:53:09,917 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:53:09,930 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:53:31,415 WARN L227 SmtUtils]: Spent 15.67s on a formula simplification. DAG size of input: 179 DAG size of output: 152 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:53:46,833 WARN L227 SmtUtils]: Spent 11.11s on a formula simplification. DAG size of input: 77 DAG size of output: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:54:06,927 WARN L227 SmtUtils]: Spent 18.33s on a formula simplification. DAG size of input: 78 DAG size of output: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:54:07,355 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7071#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 17:54:07,355 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:54:07,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:54:07,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-25 17:54:07,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930118586] [2021-11-25 17:54:07,356 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 17:54:07,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 17:54:07,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:54:07,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 17:54:07,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1021, Unknown=2, NotChecked=0, Total=1190 [2021-11-25 17:54:07,358 INFO L87 Difference]: Start difference. First operand 216 states and 291 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-25 17:54:07,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:07,909 INFO L93 Difference]: Finished difference Result 228 states and 301 transitions. [2021-11-25 17:54:07,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 17:54:07,909 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 90 [2021-11-25 17:54:07,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:07,912 INFO L225 Difference]: With dead ends: 228 [2021-11-25 17:54:07,912 INFO L226 Difference]: Without dead ends: 226 [2021-11-25 17:54:07,913 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 169 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 62.5s TimeCoverageRelationStatistics Valid=190, Invalid=1214, Unknown=2, NotChecked=0, Total=1406 [2021-11-25 17:54:07,914 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 21 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:07,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 233 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:54:07,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-25 17:54:07,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 224. [2021-11-25 17:54:07,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 128 states have (on average 1.15625) internal successors, (148), 131 states have internal predecessors, (148), 75 states have call successors, (75), 20 states have call predecessors, (75), 20 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-25 17:54:07,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 297 transitions. [2021-11-25 17:54:07,968 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 297 transitions. Word has length 90 [2021-11-25 17:54:07,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:07,969 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 297 transitions. [2021-11-25 17:54:07,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-25 17:54:07,969 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 297 transitions. [2021-11-25 17:54:07,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 17:54:07,971 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:07,971 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:07,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:08,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:08,185 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:08,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:08,186 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-25 17:54:08,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:54:08,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999809126] [2021-11-25 17:54:08,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:08,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:54:08,199 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:54:08,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [125390973] [2021-11-25 17:54:08,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:54:08,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:08,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:08,201 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:08,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 17:54:08,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 17:54:08,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:08,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 17:54:08,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:08,381 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-25 17:54:08,382 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:54:08,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:54:08,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999809126] [2021-11-25 17:54:08,382 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:54:08,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125390973] [2021-11-25 17:54:08,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125390973] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:54:08,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:54:08,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:54:08,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598729308] [2021-11-25 17:54:08,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:54:08,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:54:08,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:54:08,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:54:08,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:54:08,383 INFO L87 Difference]: Start difference. First operand 224 states and 297 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-25 17:54:08,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:54:08,512 INFO L93 Difference]: Finished difference Result 306 states and 407 transitions. [2021-11-25 17:54:08,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:54:08,513 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2021-11-25 17:54:08,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:54:08,515 INFO L225 Difference]: With dead ends: 306 [2021-11-25 17:54:08,515 INFO L226 Difference]: Without dead ends: 209 [2021-11-25 17:54:08,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:54:08,517 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:54:08,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:54:08,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-25 17:54:08,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 184. [2021-11-25 17:54:08,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 106 states have (on average 1.1132075471698113) internal successors, (118), 109 states have internal predecessors, (118), 57 states have call successors, (57), 20 states have call predecessors, (57), 20 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-25 17:54:08,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-25 17:54:08,563 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 99 [2021-11-25 17:54:08,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:54:08,564 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-25 17:54:08,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-25 17:54:08,564 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-25 17:54:08,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-25 17:54:08,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:54:08,566 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:54:08,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 17:54:08,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 17:54:08,773 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:54:08,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:54:08,773 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-25 17:54:08,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:54:08,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317756735] [2021-11-25 17:54:08,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:54:08,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:54:08,783 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:54:08,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [172515682] [2021-11-25 17:54:08,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:54:08,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:54:08,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:54:08,796 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:54:08,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 17:54:08,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 17:54:08,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:54:08,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 17:54:08,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:54:09,160 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 57 proven. 35 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2021-11-25 17:54:09,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:54:09,416 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-25 17:54:09,416 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:54:09,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317756735] [2021-11-25 17:54:09,416 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:54:09,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172515682] [2021-11-25 17:54:09,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172515682] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:54:09,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306966137] [2021-11-25 17:54:09,418 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 17:54:09,418 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:54:09,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:54:09,418 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:54:09,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:54:11,363 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-25 17:54:11,436 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:54:11,450 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:54:50,092 WARN L227 SmtUtils]: Spent 34.87s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:55:16,529 WARN L227 SmtUtils]: Spent 19.80s on a formula simplification. DAG size of input: 76 DAG size of output: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:55:16,767 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9492#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 17:55:16,767 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:55:16,767 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:55:16,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-25 17:55:16,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087192008] [2021-11-25 17:55:16,768 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:55:16,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 17:55:16,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:16,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 17:55:16,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=907, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 17:55:16,770 INFO L87 Difference]: Start difference. First operand 184 states and 231 transitions. Second operand has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-25 17:55:18,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:18,814 INFO L93 Difference]: Finished difference Result 230 states and 301 transitions. [2021-11-25 17:55:18,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 17:55:18,815 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 105 [2021-11-25 17:55:18,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:18,817 INFO L225 Difference]: With dead ends: 230 [2021-11-25 17:55:18,817 INFO L226 Difference]: Without dead ends: 228 [2021-11-25 17:55:18,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 266 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 883 ImplicationChecksByTransitivity, 66.9s TimeCoverageRelationStatistics Valid=210, Invalid=1430, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 17:55:18,819 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 40 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:18,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 321 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:55:18,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-25 17:55:18,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 188. [2021-11-25 17:55:18,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 109 states have (on average 1.110091743119266) internal successors, (121), 112 states have internal predecessors, (121), 57 states have call successors, (57), 21 states have call predecessors, (57), 21 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-25 17:55:18,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 234 transitions. [2021-11-25 17:55:18,873 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 234 transitions. Word has length 105 [2021-11-25 17:55:18,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:18,874 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 234 transitions. [2021-11-25 17:55:18,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-25 17:55:18,875 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 234 transitions. [2021-11-25 17:55:18,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-25 17:55:18,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:18,877 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:18,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 17:55:19,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 17:55:19,093 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:19,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:19,094 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-25 17:55:19,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:19,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721105978] [2021-11-25 17:55:19,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:19,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:19,106 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:55:19,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1080664399] [2021-11-25 17:55:19,106 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:55:19,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:19,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:19,115 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:19,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 17:55:19,178 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:55:19,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:55:19,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 17:55:19,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:19,801 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 59 proven. 73 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-25 17:55:19,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:55:20,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:20,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721105978] [2021-11-25 17:55:20,010 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:55:20,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080664399] [2021-11-25 17:55:20,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080664399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:20,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1380678902] [2021-11-25 17:55:20,012 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 17:55:20,012 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:55:20,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:55:20,013 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:55:20,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:55:23,512 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-25 17:55:23,520 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:55:23,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:56:03,945 WARN L227 SmtUtils]: Spent 36.44s on a formula simplification. DAG size of input: 181 DAG size of output: 152 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:56:12,235 WARN L227 SmtUtils]: Spent 7.92s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:56:27,903 WARN L227 SmtUtils]: Spent 7.14s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:56:27,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10607#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 17:56:27,966 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:56:27,966 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:56:27,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-25 17:56:27,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668961164] [2021-11-25 17:56:27,967 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 17:56:27,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 17:56:27,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:56:27,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 17:56:27,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1029, Unknown=1, NotChecked=0, Total=1190 [2021-11-25 17:56:27,968 INFO L87 Difference]: Start difference. First operand 188 states and 234 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2021-11-25 17:56:28,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:56:28,450 INFO L93 Difference]: Finished difference Result 221 states and 279 transitions. [2021-11-25 17:56:28,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 17:56:28,451 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) Word has length 107 [2021-11-25 17:56:28,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:56:28,452 INFO L225 Difference]: With dead ends: 221 [2021-11-25 17:56:28,452 INFO L226 Difference]: Without dead ends: 219 [2021-11-25 17:56:28,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 198 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 64.7s TimeCoverageRelationStatistics Valid=180, Invalid=1225, Unknown=1, NotChecked=0, Total=1406 [2021-11-25 17:56:28,454 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 24 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:56:28,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 265 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:56:28,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-25 17:56:28,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 199. [2021-11-25 17:56:28,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 116 states have (on average 1.103448275862069) internal successors, (128), 120 states have internal predecessors, (128), 60 states have call successors, (60), 22 states have call predecessors, (60), 22 states have return successors, (59), 56 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-25 17:56:28,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 247 transitions. [2021-11-25 17:56:28,507 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 247 transitions. Word has length 107 [2021-11-25 17:56:28,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:56:28,508 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 247 transitions. [2021-11-25 17:56:28,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2021-11-25 17:56:28,508 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 247 transitions. [2021-11-25 17:56:28,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-25 17:56:28,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:56:28,511 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:56:28,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 17:56:28,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:28,725 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:56:28,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:56:28,726 INFO L85 PathProgramCache]: Analyzing trace with hash -743497349, now seen corresponding path program 4 times [2021-11-25 17:56:28,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:56:28,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507207362] [2021-11-25 17:56:28,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:56:28,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:56:28,736 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:56:28,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [760602053] [2021-11-25 17:56:28,737 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 17:56:28,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:56:28,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:56:28,739 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:56:28,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 17:56:28,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:56:28,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-25 17:56:28,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:56:29,620 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 90 proven. 95 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 17:56:29,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:30,248 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 120 proven. 32 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-25 17:56:30,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:56:30,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507207362] [2021-11-25 17:56:30,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:56:30,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760602053] [2021-11-25 17:56:30,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760602053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:30,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [892656479] [2021-11-25 17:56:30,252 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 17:56:30,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:30,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:30,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:30,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:32,155 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-25 17:56:32,224 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:56:32,237 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:57:04,488 WARN L227 SmtUtils]: Spent 27.82s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:57:16,000 WARN L227 SmtUtils]: Spent 7.88s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:57:32,074 WARN L227 SmtUtils]: Spent 14.83s on a formula simplification. DAG size of input: 76 DAG size of output: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:57:32,445 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11948#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 17:57:32,445 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:57:32,445 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 17:57:32,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 21 [2021-11-25 17:57:32,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145396871] [2021-11-25 17:57:32,446 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 17:57:32,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 17:57:32,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:57:32,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 17:57:32,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1359, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 17:57:32,448 INFO L87 Difference]: Start difference. First operand 199 states and 247 transitions. Second operand has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-25 17:57:34,623 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 17:57:35,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:35,977 INFO L93 Difference]: Finished difference Result 254 states and 322 transitions. [2021-11-25 17:57:35,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 17:57:35,978 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) Word has length 110 [2021-11-25 17:57:35,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:35,980 INFO L225 Difference]: With dead ends: 254 [2021-11-25 17:57:35,980 INFO L226 Difference]: Without dead ends: 252 [2021-11-25 17:57:35,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 273 SyntacticMatches, 17 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 61.2s TimeCoverageRelationStatistics Valid=287, Invalid=2065, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 17:57:35,981 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 49 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:35,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 240 Invalid, 682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-25 17:57:35,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-25 17:57:36,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 217. [2021-11-25 17:57:36,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 126 states have (on average 1.1111111111111112) internal successors, (140), 128 states have internal predecessors, (140), 65 states have call successors, (65), 25 states have call predecessors, (65), 25 states have return successors, (64), 63 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-25 17:57:36,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 269 transitions. [2021-11-25 17:57:36,037 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 269 transitions. Word has length 110 [2021-11-25 17:57:36,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:36,038 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 269 transitions. [2021-11-25 17:57:36,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-25 17:57:36,038 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 269 transitions. [2021-11-25 17:57:36,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-25 17:57:36,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:36,040 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:36,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:36,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 17:57:36,269 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:36,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:36,270 INFO L85 PathProgramCache]: Analyzing trace with hash 1680324149, now seen corresponding path program 5 times [2021-11-25 17:57:36,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:57:36,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58138323] [2021-11-25 17:57:36,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:36,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:57:36,286 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:57:36,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1214964214] [2021-11-25 17:57:36,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 17:57:36,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:57:36,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:57:36,291 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:57:36,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 17:57:36,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 17:57:36,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:57:36,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-25 17:57:36,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:37,990 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 123 proven. 55 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2021-11-25 17:57:37,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:02,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:02,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58138323] [2021-11-25 17:58:02,873 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:58:02,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214964214] [2021-11-25 17:58:02,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214964214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:02,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268437591] [2021-11-25 17:58:02,876 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 17:58:02,876 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:58:02,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:58:02,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:58:02,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:58:09,462 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-25 17:58:09,471 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 17:58:09,484 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:58:43,965 WARN L227 SmtUtils]: Spent 24.71s on a formula simplification. DAG size of input: 179 DAG size of output: 146 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:19,319 WARN L227 SmtUtils]: Spent 15.79s on a formula simplification. DAG size of input: 77 DAG size of output: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:38,728 WARN L227 SmtUtils]: Spent 12.86s on a formula simplification. DAG size of input: 78 DAG size of output: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 17:59:41,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13201#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 17:59:41,082 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:59:41,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:59:41,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-25 17:59:41,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245744806] [2021-11-25 17:59:41,083 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 17:59:41,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 17:59:41,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:59:41,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 17:59:41,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1626, Unknown=3, NotChecked=0, Total=1892 [2021-11-25 17:59:41,085 INFO L87 Difference]: Start difference. First operand 217 states and 269 transitions. Second operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-25 17:59:42,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:59:42,677 INFO L93 Difference]: Finished difference Result 258 states and 320 transitions. [2021-11-25 17:59:42,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 17:59:42,678 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) Word has length 112 [2021-11-25 17:59:42,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:59:42,680 INFO L225 Difference]: With dead ends: 258 [2021-11-25 17:59:42,681 INFO L226 Difference]: Without dead ends: 256 [2021-11-25 17:59:42,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 204 SyntacticMatches, 24 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1634 ImplicationChecksByTransitivity, 97.0s TimeCoverageRelationStatistics Valid=331, Invalid=2116, Unknown=3, NotChecked=0, Total=2450 [2021-11-25 17:59:42,683 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 43 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 764 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:59:42,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 255 Invalid, 764 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 701 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 17:59:42,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-25 17:59:42,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 228. [2021-11-25 17:59:42,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 133 states have (on average 1.105263157894737) internal successors, (147), 136 states have internal predecessors, (147), 68 states have call successors, (68), 26 states have call predecessors, (68), 26 states have return successors, (67), 65 states have call predecessors, (67), 67 states have call successors, (67) [2021-11-25 17:59:42,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 282 transitions. [2021-11-25 17:59:42,751 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 282 transitions. Word has length 112 [2021-11-25 17:59:42,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:59:42,751 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 282 transitions. [2021-11-25 17:59:42,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-25 17:59:42,752 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 282 transitions. [2021-11-25 17:59:42,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 17:59:42,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:59:42,754 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:59:42,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 17:59:42,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 17:59:42,981 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:59:42,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:59:42,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1506060358, now seen corresponding path program 6 times [2021-11-25 17:59:42,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:59:42,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452366671] [2021-11-25 17:59:42,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:42,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:59:42,992 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:59:42,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [514327664] [2021-11-25 17:59:42,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 17:59:42,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:59:42,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:59:42,994 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:59:42,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ccf175b-2169-4c4e-87ff-77256aae5d28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 17:59:43,077 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 17:59:43,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 17:59:43,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-25 17:59:43,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:45,735 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 145 proven. 92 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-25 17:59:45,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:07,367 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 124 proven. 78 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-25 18:00:07,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:00:07,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452366671] [2021-11-25 18:00:07,367 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:00:07,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514327664] [2021-11-25 18:00:07,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514327664] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:00:07,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1644634816] [2021-11-25 18:00:07,369 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 18:00:07,369 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:00:07,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:00:07,370 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:00:07,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:00:12,665 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2021-11-25 18:00:12,672 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:00:12,685 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:41,711 WARN L227 SmtUtils]: Spent 18.71s on a formula simplification. DAG size of input: 183 DAG size of output: 150 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:01:07,255 WARN L227 SmtUtils]: Spent 6.80s on a formula simplification. DAG size of input: 83 DAG size of output: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:01:33,600 WARN L227 SmtUtils]: Spent 17.20s on a formula simplification. DAG size of input: 84 DAG size of output: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:01:41,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14684#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:01:41,404 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:01:41,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:01:41,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 32 [2021-11-25 18:01:41,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536820777] [2021-11-25 18:01:41,404 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:41,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 18:01:41,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:01:41,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 18:01:41,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=2183, Unknown=7, NotChecked=0, Total=2550 [2021-11-25 18:01:41,406 INFO L87 Difference]: Start difference. First operand 228 states and 282 transitions. Second operand has 32 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 23 states have internal predecessors, (47), 19 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (41), 19 states have call predecessors, (41), 18 states have call successors, (41) [2021-11-25 18:02:14,775 WARN L227 SmtUtils]: Spent 30.24s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:02:32,904 WARN L227 SmtUtils]: Spent 11.81s on a formula simplification that was a NOOP. DAG size: 78 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:02:34,187 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:02:36,245 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []