./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba --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 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 01:41:02,537 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 01:41:02,539 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 01:41:02,571 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 01:41:02,572 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 01:41:02,574 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 01:41:02,578 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 01:41:02,593 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 01:41:02,596 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 01:41:02,598 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 01:41:02,601 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 01:41:02,605 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 01:41:02,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 01:41:02,610 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 01:41:02,615 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 01:41:02,618 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 01:41:02,620 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 01:41:02,626 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 01:41:02,628 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 01:41:02,630 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 01:41:02,634 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 01:41:02,636 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 01:41:02,638 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 01:41:02,640 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 01:41:02,645 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 01:41:02,651 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 01:41:02,652 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 01:41:02,653 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 01:41:02,654 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 01:41:02,656 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 01:41:02,657 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 01:41:02,658 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 01:41:02,660 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 01:41:02,661 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 01:41:02,663 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 01:41:02,664 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 01:41:02,665 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 01:41:02,666 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 01:41:02,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 01:41:02,668 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 01:41:02,669 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 01:41:02,670 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 01:41:02,693 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 01:41:02,694 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 01:41:02,694 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 01:41:02,694 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 01:41:02,695 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 01:41:02,695 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 01:41:02,696 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 01:41:02,696 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 01:41:02,696 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 01:41:02,696 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 01:41:02,697 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 01:41:02,697 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 01:41:02,697 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 01:41:02,697 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 01:41:02,697 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 01:41:02,698 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 01:41:02,698 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 01:41:02,698 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 01:41:02,699 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 01:41:02,699 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 01:41:02,699 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 01:41:02,700 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 01:41:02,700 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 01:41:02,700 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 01:41:02,700 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 01:41:02,700 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 01:41:02,701 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 01:41:02,701 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 01:41:02,701 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 01:41:02,701 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 01:41:02,702 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 01:41:02,702 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 01:41:02,702 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:41:02,702 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 01:41:02,703 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 01:41:02,703 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 01:41:02,703 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 01:41:02,703 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 01:41:02,703 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 01:41:02,704 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 01:41:02,704 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 01:41:02,704 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be [2022-11-22 01:41:03,050 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 01:41:03,086 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 01:41:03,088 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 01:41:03,090 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 01:41:03,091 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 01:41:03,092 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench/egcd3-ll.c [2022-11-22 01:41:06,384 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 01:41:06,586 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 01:41:06,586 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/sv-benchmarks/c/nla-digbench/egcd3-ll.c [2022-11-22 01:41:06,596 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/data/f79a323b2/3641b7441518474c8572156d73b17554/FLAGbf244b5d8 [2022-11-22 01:41:06,609 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/data/f79a323b2/3641b7441518474c8572156d73b17554 [2022-11-22 01:41:06,612 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 01:41:06,613 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 01:41:06,615 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 01:41:06,615 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 01:41:06,619 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 01:41:06,620 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,621 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e135de2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06, skipping insertion in model container [2022-11-22 01:41:06,621 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,629 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 01:41:06,644 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 01:41:06,843 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2022-11-22 01:41:06,867 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:41:06,879 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 01:41:06,891 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2022-11-22 01:41:06,905 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:41:06,922 INFO L208 MainTranslator]: Completed translation [2022-11-22 01:41:06,923 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06 WrapperNode [2022-11-22 01:41:06,923 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 01:41:06,925 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 01:41:06,925 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 01:41:06,925 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 01:41:06,932 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,940 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,962 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 78 [2022-11-22 01:41:06,962 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 01:41:06,963 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 01:41:06,963 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 01:41:06,963 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 01:41:06,974 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,975 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,976 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,980 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,986 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,988 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,988 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:06,991 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 01:41:06,992 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 01:41:06,992 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 01:41:06,992 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 01:41:06,993 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (1/1) ... [2022-11-22 01:41:07,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:41:07,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:07,045 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 01:41:07,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 01:41:07,104 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 01:41:07,104 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 01:41:07,104 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 01:41:07,105 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 01:41:07,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 01:41:07,105 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 01:41:07,106 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 01:41:07,106 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 01:41:07,191 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 01:41:07,196 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 01:41:07,524 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 01:41:07,551 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 01:41:07,551 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-22 01:41:07,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:41:07 BoogieIcfgContainer [2022-11-22 01:41:07,554 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 01:41:07,557 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 01:41:07,558 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 01:41:07,561 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 01:41:07,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:41:06" (1/3) ... [2022-11-22 01:41:07,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12987afb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:41:07, skipping insertion in model container [2022-11-22 01:41:07,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:41:06" (2/3) ... [2022-11-22 01:41:07,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12987afb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:41:07, skipping insertion in model container [2022-11-22 01:41:07,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:41:07" (3/3) ... [2022-11-22 01:41:07,565 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll.c [2022-11-22 01:41:07,587 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 01:41:07,587 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 01:41:07,651 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 01:41:07,658 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@59d00b5b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 01:41:07,659 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 01:41:07,664 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-22 01:41:07,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 01:41:07,680 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:07,681 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:41:07,682 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:07,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:07,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1524023292, now seen corresponding path program 1 times [2022-11-22 01:41:07,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:07,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109473328] [2022-11-22 01:41:07,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:07,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:07,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:07,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:07,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109473328] [2022-11-22 01:41:07,955 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 01:41:07,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623823683] [2022-11-22 01:41:07,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:07,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:07,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:07,962 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:07,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 01:41:08,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:08,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 01:41:08,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:08,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:41:08,147 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:41:08,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623823683] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:41:08,148 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:41:08,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 01:41:08,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461014104] [2022-11-22 01:41:08,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:41:08,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 01:41:08,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:08,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 01:41:08,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 01:41:08,210 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 01:41:08,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:41:08,269 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2022-11-22 01:41:08,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 01:41:08,272 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-22 01:41:08,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:41:08,282 INFO L225 Difference]: With dead ends: 48 [2022-11-22 01:41:08,283 INFO L226 Difference]: Without dead ends: 25 [2022-11-22 01:41:08,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 01:41:08,291 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:41:08,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:41:08,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-22 01:41:08,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-22 01:41:08,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 01:41:08,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2022-11-22 01:41:08,354 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 13 [2022-11-22 01:41:08,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:41:08,358 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2022-11-22 01:41:08,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 01:41:08,360 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2022-11-22 01:41:08,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 01:41:08,370 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:08,379 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:41:08,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 01:41:08,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 01:41:08,580 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:08,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:08,582 INFO L85 PathProgramCache]: Analyzing trace with hash 1500233354, now seen corresponding path program 1 times [2022-11-22 01:41:08,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:08,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79994239] [2022-11-22 01:41:08,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:08,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:08,606 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:41:08,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [839957683] [2022-11-22 01:41:08,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:08,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:08,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:08,620 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:08,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 01:41:08,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:08,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 01:41:08,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:08,794 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:41:08,794 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:41:08,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:08,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79994239] [2022-11-22 01:41:08,795 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:41:08,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839957683] [2022-11-22 01:41:08,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839957683] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:41:08,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:41:08,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 01:41:08,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507972013] [2022-11-22 01:41:08,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:41:08,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:41:08,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:08,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:41:08,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:41:08,800 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 01:41:08,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:41:08,929 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2022-11-22 01:41:08,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 01:41:08,930 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-22 01:41:08,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:41:08,932 INFO L225 Difference]: With dead ends: 44 [2022-11-22 01:41:08,932 INFO L226 Difference]: Without dead ends: 37 [2022-11-22 01:41:08,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 01:41:08,934 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:41:08,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 70 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:41:08,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-22 01:41:08,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 27. [2022-11-22 01:41:08,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 01:41:08,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-11-22 01:41:08,947 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 14 [2022-11-22 01:41:08,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:41:08,948 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-11-22 01:41:08,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 01:41:08,948 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-11-22 01:41:08,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-22 01:41:08,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:08,949 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:41:08,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-22 01:41:09,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:09,156 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:09,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:09,157 INFO L85 PathProgramCache]: Analyzing trace with hash -640281993, now seen corresponding path program 1 times [2022-11-22 01:41:09,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:09,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478401338] [2022-11-22 01:41:09,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:09,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:09,181 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:41:09,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1889639697] [2022-11-22 01:41:09,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:09,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:09,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:09,189 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:09,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 01:41:09,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:09,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:41:09,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:09,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:41:09,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:41:09,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:09,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478401338] [2022-11-22 01:41:09,497 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:41:09,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889639697] [2022-11-22 01:41:09,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889639697] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:41:09,498 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:41:09,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-22 01:41:09,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840997081] [2022-11-22 01:41:09,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:41:09,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 01:41:09,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:09,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 01:41:09,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-22 01:41:09,500 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 01:41:09,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:41:09,695 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2022-11-22 01:41:09,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 01:41:09,697 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-11-22 01:41:09,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:41:09,699 INFO L225 Difference]: With dead ends: 43 [2022-11-22 01:41:09,699 INFO L226 Difference]: Without dead ends: 41 [2022-11-22 01:41:09,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-22 01:41:09,701 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 53 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:41:09,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 101 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:41:09,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-22 01:41:09,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2022-11-22 01:41:09,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.24) internal successors, (31), 26 states have internal predecessors, (31), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 01:41:09,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2022-11-22 01:41:09,731 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 17 [2022-11-22 01:41:09,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:41:09,731 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2022-11-22 01:41:09,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 01:41:09,732 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2022-11-22 01:41:09,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 01:41:09,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:09,734 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:41:09,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 01:41:09,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:09,940 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:09,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:09,941 INFO L85 PathProgramCache]: Analyzing trace with hash -377003451, now seen corresponding path program 1 times [2022-11-22 01:41:09,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:09,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868476194] [2022-11-22 01:41:09,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:09,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:09,961 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:41:09,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1087544666] [2022-11-22 01:41:09,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:09,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:09,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:09,966 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:09,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 01:41:10,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:10,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 01:41:10,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:10,126 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:41:10,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:41:10,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:41:10,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:10,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868476194] [2022-11-22 01:41:10,261 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:41:10,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087544666] [2022-11-22 01:41:10,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087544666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:41:10,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097529243] [2022-11-22 01:41:10,285 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-22 01:41:10,285 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:41:10,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:41:10,295 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:41:10,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:41:11,124 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:41:11,175 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:41:13,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1097529243] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:41:13,054 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:41:13,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 15 [2022-11-22 01:41:13,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301172855] [2022-11-22 01:41:13,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:41:13,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-22 01:41:13,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:13,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-22 01:41:13,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-11-22 01:41:13,057 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:41:13,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:41:13,411 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2022-11-22 01:41:13,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 01:41:13,412 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-11-22 01:41:13,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:41:13,416 INFO L225 Difference]: With dead ends: 68 [2022-11-22 01:41:13,416 INFO L226 Difference]: Without dead ends: 61 [2022-11-22 01:41:13,417 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-11-22 01:41:13,418 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 50 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 01:41:13,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 56 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 01:41:13,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-22 01:41:13,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 47. [2022-11-22 01:41:13,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 01:41:13,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2022-11-22 01:41:13,449 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 19 [2022-11-22 01:41:13,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:41:13,449 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2022-11-22 01:41:13,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:41:13,450 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2022-11-22 01:41:13,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-22 01:41:13,451 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:13,451 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:41:13,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 01:41:13,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:13,657 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:13,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:13,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1954095958, now seen corresponding path program 1 times [2022-11-22 01:41:13,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:13,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330597269] [2022-11-22 01:41:13,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:13,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:13,688 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:41:13,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [440838579] [2022-11-22 01:41:13,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:13,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:13,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:13,695 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:13,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 01:41:13,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:13,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 01:41:13,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:14,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:41:14,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:41:14,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:14,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330597269] [2022-11-22 01:41:14,221 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:41:14,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440838579] [2022-11-22 01:41:14,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440838579] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:41:14,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1323637122] [2022-11-22 01:41:14,224 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-22 01:41:14,224 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:41:14,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:41:14,225 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:41:14,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:41:14,548 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-22 01:41:14,560 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:41:14,593 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:41:16,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1323637122] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:41:16,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:41:16,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [13] total 23 [2022-11-22 01:41:16,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950189591] [2022-11-22 01:41:16,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:41:16,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 01:41:16,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:16,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 01:41:16,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:41:16,060 INFO L87 Difference]: Start difference. First operand 47 states and 61 transitions. Second operand has 12 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 01:41:16,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:41:16,505 INFO L93 Difference]: Finished difference Result 69 states and 92 transitions. [2022-11-22 01:41:16,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 01:41:16,507 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2022-11-22 01:41:16,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:41:16,508 INFO L225 Difference]: With dead ends: 69 [2022-11-22 01:41:16,508 INFO L226 Difference]: Without dead ends: 67 [2022-11-22 01:41:16,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:41:16,510 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 45 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 01:41:16,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 58 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 01:41:16,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-22 01:41:16,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2022-11-22 01:41:16,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.236842105263158) internal successors, (47), 40 states have internal predecessors, (47), 19 states have call successors, (19), 4 states have call predecessors, (19), 4 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-22 01:41:16,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 84 transitions. [2022-11-22 01:41:16,569 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 84 transitions. Word has length 22 [2022-11-22 01:41:16,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:41:16,570 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 84 transitions. [2022-11-22 01:41:16,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 01:41:16,571 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 84 transitions. [2022-11-22 01:41:16,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-22 01:41:16,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:16,572 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:41:16,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 01:41:16,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:16,780 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:16,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:16,781 INFO L85 PathProgramCache]: Analyzing trace with hash -632778532, now seen corresponding path program 1 times [2022-11-22 01:41:16,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:16,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450316793] [2022-11-22 01:41:16,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:16,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:16,800 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:41:16,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [188908293] [2022-11-22 01:41:16,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:16,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:16,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:16,822 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:16,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 01:41:16,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:16,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 01:41:16,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:17,090 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:41:17,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:41:17,287 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:41:17,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:17,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450316793] [2022-11-22 01:41:17,287 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:41:17,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188908293] [2022-11-22 01:41:17,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188908293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:41:17,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1554022182] [2022-11-22 01:41:17,291 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 01:41:17,291 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:41:17,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:41:17,292 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:41:17,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:41:18,261 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-22 01:41:18,268 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:41:18,296 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:41:20,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1554022182] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:41:20,303 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:41:20,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 6] total 23 [2022-11-22 01:41:20,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043922384] [2022-11-22 01:41:20,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:41:20,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 01:41:20,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:20,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 01:41:20,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2022-11-22 01:41:20,305 INFO L87 Difference]: Start difference. First operand 62 states and 84 transitions. Second operand has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:41:21,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:41:21,082 INFO L93 Difference]: Finished difference Result 93 states and 123 transitions. [2022-11-22 01:41:21,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 01:41:21,084 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-11-22 01:41:21,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:41:21,086 INFO L225 Difference]: With dead ends: 93 [2022-11-22 01:41:21,086 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 01:41:21,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2022-11-22 01:41:21,087 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 42 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:41:21,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 74 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 01:41:21,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 01:41:21,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2022-11-22 01:41:21,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 50 states have (on average 1.2) internal successors, (60), 53 states have internal predecessors, (60), 27 states have call successors, (27), 7 states have call predecessors, (27), 7 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2022-11-22 01:41:21,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 113 transitions. [2022-11-22 01:41:21,166 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 113 transitions. Word has length 22 [2022-11-22 01:41:21,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:41:21,167 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 113 transitions. [2022-11-22 01:41:21,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:41:21,167 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 113 transitions. [2022-11-22 01:41:21,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:41:21,176 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:41:21,177 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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] [2022-11-22 01:41:21,189 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-22 01:41:21,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:21,384 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:41:21,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:41:21,385 INFO L85 PathProgramCache]: Analyzing trace with hash -143636076, now seen corresponding path program 1 times [2022-11-22 01:41:21,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:41:21,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064719642] [2022-11-22 01:41:21,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:21,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:41:21,409 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:41:21,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674718080] [2022-11-22 01:41:21,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:41:21,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:41:21,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:41:21,411 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:41:21,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 01:41:21,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:41:21,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-22 01:41:21,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:41:22,279 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 01:41:22,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:41:23,193 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 01:41:23,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:41:23,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064719642] [2022-11-22 01:41:23,194 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:41:23,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674718080] [2022-11-22 01:41:23,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674718080] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:41:23,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1297330804] [2022-11-22 01:41:23,199 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 01:41:23,199 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:41:23,199 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:41:23,200 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:41:23,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:41:30,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:41:30,168 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:41:30,190 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:41:49,123 WARN L233 SmtUtils]: Spent 5.00s on a formula simplification. DAG size of input: 73 DAG size of output: 63 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:41:50,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1813#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:41:50,390 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:41:50,390 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:41:50,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-11-22 01:41:50,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888210310] [2022-11-22 01:41:50,391 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:41:50,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 01:41:50,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:41:50,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 01:41:50,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1674, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 01:41:50,393 INFO L87 Difference]: Start difference. First operand 85 states and 113 transitions. Second operand has 25 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 01:42:06,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:42:06,701 INFO L93 Difference]: Finished difference Result 237 states and 341 transitions. [2022-11-22 01:42:06,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 01:42:06,702 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 44 [2022-11-22 01:42:06,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:42:06,705 INFO L225 Difference]: With dead ends: 237 [2022-11-22 01:42:06,706 INFO L226 Difference]: Without dead ends: 199 [2022-11-22 01:42:06,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1477 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=646, Invalid=4466, Unknown=0, NotChecked=0, Total=5112 [2022-11-22 01:42:06,709 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 179 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 1319 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 1563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 1319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-11-22 01:42:06,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 187 Invalid, 1563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 1319 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-11-22 01:42:06,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-11-22 01:42:06,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 150. [2022-11-22 01:42:06,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 98 states have (on average 1.2346938775510203) internal successors, (121), 100 states have internal predecessors, (121), 43 states have call successors, (43), 8 states have call predecessors, (43), 8 states have return successors, (42), 41 states have call predecessors, (42), 42 states have call successors, (42) [2022-11-22 01:42:06,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 206 transitions. [2022-11-22 01:42:06,818 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 206 transitions. Word has length 44 [2022-11-22 01:42:06,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:42:06,819 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 206 transitions. [2022-11-22 01:42:06,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 01:42:06,820 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 206 transitions. [2022-11-22 01:42:06,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-22 01:42:06,821 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:42:06,822 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 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] [2022-11-22 01:42:06,834 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-22 01:42:07,029 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:07,029 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:42:07,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:42:07,029 INFO L85 PathProgramCache]: Analyzing trace with hash 227774145, now seen corresponding path program 1 times [2022-11-22 01:42:07,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:42:07,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890252881] [2022-11-22 01:42:07,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:42:07,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:42:07,057 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:42:07,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1572451577] [2022-11-22 01:42:07,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:42:07,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:07,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:42:07,065 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:42:07,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 01:42:07,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:42:07,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 01:42:07,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:42:07,211 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 01:42:07,211 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:42:07,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:42:07,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890252881] [2022-11-22 01:42:07,211 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:42:07,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572451577] [2022-11-22 01:42:07,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1572451577] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:42:07,212 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:42:07,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 01:42:07,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464013437] [2022-11-22 01:42:07,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:42:07,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:42:07,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:42:07,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:42:07,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:42:07,218 INFO L87 Difference]: Start difference. First operand 150 states and 206 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 01:42:07,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:42:07,434 INFO L93 Difference]: Finished difference Result 247 states and 345 transitions. [2022-11-22 01:42:07,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:42:07,435 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 47 [2022-11-22 01:42:07,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:42:07,436 INFO L225 Difference]: With dead ends: 247 [2022-11-22 01:42:07,437 INFO L226 Difference]: Without dead ends: 181 [2022-11-22 01:42:07,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-22 01:42:07,439 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:42:07,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 69 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:42:07,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-11-22 01:42:07,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 175. [2022-11-22 01:42:07,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 111 states have (on average 1.2252252252252251) internal successors, (136), 112 states have internal predecessors, (136), 55 states have call successors, (55), 8 states have call predecessors, (55), 8 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2022-11-22 01:42:07,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 245 transitions. [2022-11-22 01:42:07,558 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 245 transitions. Word has length 47 [2022-11-22 01:42:07,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:42:07,559 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 245 transitions. [2022-11-22 01:42:07,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 01:42:07,559 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 245 transitions. [2022-11-22 01:42:07,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-22 01:42:07,561 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:42:07,562 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:42:07,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 01:42:07,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-22 01:42:07,769 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:42:07,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:42:07,770 INFO L85 PathProgramCache]: Analyzing trace with hash 583515831, now seen corresponding path program 1 times [2022-11-22 01:42:07,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:42:07,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032600002] [2022-11-22 01:42:07,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:42:07,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:42:07,790 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:42:07,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [322076135] [2022-11-22 01:42:07,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:42:07,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:07,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:42:07,796 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:42:07,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 01:42:07,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:42:07,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:42:07,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:42:08,077 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 23 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2022-11-22 01:42:08,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:42:08,244 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2022-11-22 01:42:08,244 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:42:08,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032600002] [2022-11-22 01:42:08,245 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:42:08,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322076135] [2022-11-22 01:42:08,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322076135] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:42:08,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1121530126] [2022-11-22 01:42:08,248 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-22 01:42:08,248 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:42:08,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:42:08,249 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:42:08,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:42:12,528 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-22 01:42:12,580 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:42:12,605 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:42:16,755 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3625#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:42:16,755 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:42:16,755 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:42:16,755 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-22 01:42:16,755 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633236793] [2022-11-22 01:42:16,755 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:42:16,756 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 01:42:16,756 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:42:16,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 01:42:16,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-22 01:42:16,757 INFO L87 Difference]: Start difference. First operand 175 states and 245 transitions. Second operand has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2022-11-22 01:42:17,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:42:17,455 INFO L93 Difference]: Finished difference Result 219 states and 299 transitions. [2022-11-22 01:42:17,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 01:42:17,456 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) Word has length 54 [2022-11-22 01:42:17,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:42:17,458 INFO L225 Difference]: With dead ends: 219 [2022-11-22 01:42:17,458 INFO L226 Difference]: Without dead ends: 217 [2022-11-22 01:42:17,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=183, Invalid=1223, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:42:17,460 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 59 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 01:42:17,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 104 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 01:42:17,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-11-22 01:42:17,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 187. [2022-11-22 01:42:17,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 120 states have (on average 1.2083333333333333) internal successors, (145), 121 states have internal predecessors, (145), 55 states have call successors, (55), 11 states have call predecessors, (55), 11 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2022-11-22 01:42:17,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 254 transitions. [2022-11-22 01:42:17,588 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 254 transitions. Word has length 54 [2022-11-22 01:42:17,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:42:17,589 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 254 transitions. [2022-11-22 01:42:17,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2022-11-22 01:42:17,590 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 254 transitions. [2022-11-22 01:42:17,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:42:17,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:42:17,591 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:42:17,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 01:42:17,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:17,792 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:42:17,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:42:17,793 INFO L85 PathProgramCache]: Analyzing trace with hash 658403814, now seen corresponding path program 2 times [2022-11-22 01:42:17,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:42:17,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208996108] [2022-11-22 01:42:17,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:42:17,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:42:17,804 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:42:17,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [648285979] [2022-11-22 01:42:17,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:42:17,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:17,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:42:17,806 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:42:17,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 01:42:17,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:42:17,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:42:17,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 01:42:17,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:42:17,921 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 01:42:17,921 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:42:17,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:42:17,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208996108] [2022-11-22 01:42:17,922 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:42:17,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648285979] [2022-11-22 01:42:17,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648285979] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:42:17,923 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:42:17,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 01:42:17,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046659210] [2022-11-22 01:42:17,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:42:17,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:42:17,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:42:17,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:42:17,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:42:17,928 INFO L87 Difference]: Start difference. First operand 187 states and 254 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 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) [2022-11-22 01:42:18,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:42:18,258 INFO L93 Difference]: Finished difference Result 278 states and 380 transitions. [2022-11-22 01:42:18,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:42:18,259 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 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 52 [2022-11-22 01:42:18,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:42:18,261 INFO L225 Difference]: With dead ends: 278 [2022-11-22 01:42:18,261 INFO L226 Difference]: Without dead ends: 204 [2022-11-22 01:42:18,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-22 01:42:18,263 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 19 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:42:18,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 102 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:42:18,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-11-22 01:42:18,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 178. [2022-11-22 01:42:18,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 115 states have (on average 1.173913043478261) internal successors, (135), 116 states have internal predecessors, (135), 51 states have call successors, (51), 11 states have call predecessors, (51), 11 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2022-11-22 01:42:18,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 236 transitions. [2022-11-22 01:42:18,382 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 236 transitions. Word has length 52 [2022-11-22 01:42:18,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:42:18,383 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 236 transitions. [2022-11-22 01:42:18,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 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) [2022-11-22 01:42:18,383 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 236 transitions. [2022-11-22 01:42:18,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:42:18,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:42:18,385 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:42:18,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 01:42:18,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:18,592 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:42:18,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:42:18,593 INFO L85 PathProgramCache]: Analyzing trace with hash -1948306734, now seen corresponding path program 3 times [2022-11-22 01:42:18,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:42:18,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149857924] [2022-11-22 01:42:18,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:42:18,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:42:18,603 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:42:18,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1941709920] [2022-11-22 01:42:18,604 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:42:18,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:42:18,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:42:18,606 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:42:18,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 01:42:18,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:42:18,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:42:18,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 01:42:18,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:42:22,405 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 01:42:22,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:42:23,220 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 01:42:23,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:42:23,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149857924] [2022-11-22 01:42:23,221 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:42:23,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941709920] [2022-11-22 01:42:23,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941709920] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:42:23,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [213216847] [2022-11-22 01:42:23,224 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 01:42:23,224 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:42:23,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:42:23,225 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:42:23,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:42:29,103 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:42:29,107 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:42:29,129 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:42:41,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5475#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:42:41,600 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:42:41,600 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:42:41,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-11-22 01:42:41,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814546474] [2022-11-22 01:42:41,600 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:42:41,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 01:42:41,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:42:41,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 01:42:41,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1382, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:42:41,603 INFO L87 Difference]: Start difference. First operand 178 states and 236 transitions. Second operand has 22 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 01:43:01,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:43:01,191 INFO L93 Difference]: Finished difference Result 254 states and 334 transitions. [2022-11-22 01:43:01,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 01:43:01,192 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 52 [2022-11-22 01:43:01,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:43:01,194 INFO L225 Difference]: With dead ends: 254 [2022-11-22 01:43:01,194 INFO L226 Difference]: Without dead ends: 252 [2022-11-22 01:43:01,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 853 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=344, Invalid=2736, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 01:43:01,197 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 110 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 1008 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 1137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 1008 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2022-11-22 01:43:01,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 269 Invalid, 1137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 1008 Invalid, 0 Unknown, 0 Unchecked, 8.6s Time] [2022-11-22 01:43:01,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2022-11-22 01:43:01,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 197. [2022-11-22 01:43:01,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 128 states have (on average 1.15625) internal successors, (148), 130 states have internal predecessors, (148), 53 states have call successors, (53), 15 states have call predecessors, (53), 15 states have return successors, (52), 51 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-22 01:43:01,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 253 transitions. [2022-11-22 01:43:01,318 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 253 transitions. Word has length 52 [2022-11-22 01:43:01,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:43:01,319 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 253 transitions. [2022-11-22 01:43:01,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 01:43:01,319 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 253 transitions. [2022-11-22 01:43:01,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-22 01:43:01,320 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:43:01,320 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 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] [2022-11-22 01:43:01,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 01:43:01,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:01,527 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:43:01,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:43:01,528 INFO L85 PathProgramCache]: Analyzing trace with hash 1501893325, now seen corresponding path program 4 times [2022-11-22 01:43:01,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:43:01,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578758507] [2022-11-22 01:43:01,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:01,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:43:01,539 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:43:01,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1987351700] [2022-11-22 01:43:01,540 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:43:01,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:01,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:43:01,545 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:43:01,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 01:43:01,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:43:01,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 01:43:01,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:43:01,800 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-22 01:43:01,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:43:01,894 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-22 01:43:01,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:43:01,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578758507] [2022-11-22 01:43:01,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:43:01,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987351700] [2022-11-22 01:43:01,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987351700] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 01:43:01,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:43:01,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-22 01:43:01,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571847820] [2022-11-22 01:43:01,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:43:01,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:43:01,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:43:01,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:43:01,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-22 01:43:01,896 INFO L87 Difference]: Start difference. First operand 197 states and 253 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-22 01:43:02,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:43:02,108 INFO L93 Difference]: Finished difference Result 225 states and 292 transitions. [2022-11-22 01:43:02,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:43:02,110 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 57 [2022-11-22 01:43:02,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:43:02,112 INFO L225 Difference]: With dead ends: 225 [2022-11-22 01:43:02,112 INFO L226 Difference]: Without dead ends: 223 [2022-11-22 01:43:02,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-22 01:43:02,113 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 7 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:43:02,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 85 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:43:02,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-11-22 01:43:02,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 220. [2022-11-22 01:43:02,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 139 states have (on average 1.1654676258992807) internal successors, (162), 140 states have internal predecessors, (162), 63 states have call successors, (63), 17 states have call predecessors, (63), 17 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2022-11-22 01:43:02,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 287 transitions. [2022-11-22 01:43:02,241 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 287 transitions. Word has length 57 [2022-11-22 01:43:02,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:43:02,241 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 287 transitions. [2022-11-22 01:43:02,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-22 01:43:02,242 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 287 transitions. [2022-11-22 01:43:02,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-22 01:43:02,243 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:43:02,243 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:43:02,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 01:43:02,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 01:43:02,444 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:43:02,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:43:02,444 INFO L85 PathProgramCache]: Analyzing trace with hash -697498661, now seen corresponding path program 5 times [2022-11-22 01:43:02,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:43:02,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368025799] [2022-11-22 01:43:02,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:02,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:43:02,455 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:43:02,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [762943328] [2022-11-22 01:43:02,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:43:02,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:02,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:43:02,457 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:43:02,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 01:43:02,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:43:02,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:43:02,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-22 01:43:02,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:43:03,454 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 01:43:03,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:43:05,016 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 01:43:05,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:43:05,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368025799] [2022-11-22 01:43:05,017 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:43:05,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762943328] [2022-11-22 01:43:05,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762943328] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:43:05,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [613679542] [2022-11-22 01:43:05,020 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 01:43:05,020 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:43:05,020 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:43:05,020 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:43:05,021 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:43:10,195 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:43:10,200 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:43:10,221 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:43:31,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7612#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:43:31,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:43:31,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:43:31,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 28 [2022-11-22 01:43:31,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525220301] [2022-11-22 01:43:31,234 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:43:31,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 01:43:31,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:43:31,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 01:43:31,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=1795, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 01:43:31,236 INFO L87 Difference]: Start difference. First operand 220 states and 287 transitions. Second operand has 28 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 7 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 01:43:51,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:43:51,749 INFO L93 Difference]: Finished difference Result 328 states and 433 transitions. [2022-11-22 01:43:51,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 01:43:51,750 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 7 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 57 [2022-11-22 01:43:51,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:43:51,752 INFO L225 Difference]: With dead ends: 328 [2022-11-22 01:43:51,752 INFO L226 Difference]: Without dead ends: 326 [2022-11-22 01:43:51,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1545 ImplicationChecksByTransitivity, 35.5s TimeCoverageRelationStatistics Valid=826, Invalid=4724, Unknown=0, NotChecked=0, Total=5550 [2022-11-22 01:43:51,755 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 248 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 1460 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 1801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 1460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-11-22 01:43:51,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 255 Invalid, 1801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 1460 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2022-11-22 01:43:51,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-11-22 01:43:51,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 293. [2022-11-22 01:43:51,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 188 states have (on average 1.1595744680851063) internal successors, (218), 191 states have internal predecessors, (218), 83 states have call successors, (83), 21 states have call predecessors, (83), 21 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2022-11-22 01:43:51,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 383 transitions. [2022-11-22 01:43:51,993 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 383 transitions. Word has length 57 [2022-11-22 01:43:51,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:43:51,993 INFO L495 AbstractCegarLoop]: Abstraction has 293 states and 383 transitions. [2022-11-22 01:43:51,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 7 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 01:43:51,993 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 383 transitions. [2022-11-22 01:43:51,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-22 01:43:51,994 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:43:51,995 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:43:52,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 01:43:52,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 01:43:52,201 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:43:52,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:43:52,202 INFO L85 PathProgramCache]: Analyzing trace with hash -712450224, now seen corresponding path program 1 times [2022-11-22 01:43:52,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:43:52,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068404485] [2022-11-22 01:43:52,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:52,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:43:52,222 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:43:52,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [475540707] [2022-11-22 01:43:52,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:43:52,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:43:52,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:43:52,224 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:43:52,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 01:43:52,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:43:52,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-22 01:43:52,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:43:53,714 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 30 proven. 27 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-22 01:43:53,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:43:59,415 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 30 proven. 26 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-11-22 01:43:59,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:43:59,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068404485] [2022-11-22 01:43:59,416 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:43:59,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475540707] [2022-11-22 01:43:59,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475540707] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:43:59,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265344976] [2022-11-22 01:43:59,419 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 01:43:59,419 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:43:59,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:43:59,420 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:43:59,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:44:05,384 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:44:05,388 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:44:05,406 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:44:37,502 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9093#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:44:37,503 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:44:37,503 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:44:37,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 33 [2022-11-22 01:44:37,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297707430] [2022-11-22 01:44:37,503 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:44:37,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 01:44:37,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:44:37,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 01:44:37,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=2151, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:44:37,505 INFO L87 Difference]: Start difference. First operand 293 states and 383 transitions. Second operand has 33 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 31 states have internal predecessors, (57), 10 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2022-11-22 01:45:34,152 WARN L233 SmtUtils]: Spent 7.56s on a formula simplification that was a NOOP. DAG size: 102 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:45:43,134 WARN L233 SmtUtils]: Spent 6.43s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:46:11,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:46:11,520 INFO L93 Difference]: Finished difference Result 499 states and 686 transitions. [2022-11-22 01:46:11,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-22 01:46:11,520 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 31 states have internal predecessors, (57), 10 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) Word has length 71 [2022-11-22 01:46:11,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:46:11,524 INFO L225 Difference]: With dead ends: 499 [2022-11-22 01:46:11,524 INFO L226 Difference]: Without dead ends: 495 [2022-11-22 01:46:11,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 153 SyntacticMatches, 10 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3855 ImplicationChecksByTransitivity, 102.5s TimeCoverageRelationStatistics Valid=1647, Invalid=9909, Unknown=0, NotChecked=0, Total=11556 [2022-11-22 01:46:11,529 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 388 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 2205 mSolverCounterSat, 707 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 2912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 707 IncrementalHoareTripleChecker+Valid, 2205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.6s IncrementalHoareTripleChecker+Time [2022-11-22 01:46:11,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 323 Invalid, 2912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [707 Valid, 2205 Invalid, 0 Unknown, 0 Unchecked, 25.6s Time] [2022-11-22 01:46:11,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2022-11-22 01:46:12,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 471. [2022-11-22 01:46:12,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 299 states have (on average 1.1839464882943145) internal successors, (354), 303 states have internal predecessors, (354), 145 states have call successors, (145), 26 states have call predecessors, (145), 26 states have return successors, (144), 141 states have call predecessors, (144), 144 states have call successors, (144) [2022-11-22 01:46:12,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 643 transitions. [2022-11-22 01:46:12,107 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 643 transitions. Word has length 71 [2022-11-22 01:46:12,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:46:12,108 INFO L495 AbstractCegarLoop]: Abstraction has 471 states and 643 transitions. [2022-11-22 01:46:12,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 31 states have internal predecessors, (57), 10 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2022-11-22 01:46:12,108 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 643 transitions. [2022-11-22 01:46:12,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-22 01:46:12,110 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:46:12,110 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:46:12,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 01:46:12,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:46:12,316 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:46:12,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:46:12,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1599192679, now seen corresponding path program 1 times [2022-11-22 01:46:12,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:46:12,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131107580] [2022-11-22 01:46:12,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:46:12,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:46:12,326 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:46:12,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1397971139] [2022-11-22 01:46:12,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:46:12,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:46:12,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:46:12,328 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:46:12,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 01:46:12,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:46:12,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-22 01:46:12,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:46:12,777 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 20 proven. 17 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2022-11-22 01:46:12,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:46:13,607 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-22 01:46:13,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:46:13,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131107580] [2022-11-22 01:46:13,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:46:13,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397971139] [2022-11-22 01:46:13,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397971139] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:46:13,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1753847128] [2022-11-22 01:46:13,609 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 01:46:13,609 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:46:13,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:46:13,610 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:46:13,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:46:18,760 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-22 01:46:18,802 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:46:18,821 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:46:25,225 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11192#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:46:25,225 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:46:25,225 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:46:25,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-22 01:46:25,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857693276] [2022-11-22 01:46:25,225 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:46:25,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 01:46:25,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:46:25,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 01:46:25,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1155, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 01:46:25,227 INFO L87 Difference]: Start difference. First operand 471 states and 643 transitions. Second operand has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-22 01:46:29,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:46:29,221 INFO L93 Difference]: Finished difference Result 925 states and 1379 transitions. [2022-11-22 01:46:29,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 01:46:29,221 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 74 [2022-11-22 01:46:29,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:46:29,226 INFO L225 Difference]: With dead ends: 925 [2022-11-22 01:46:29,226 INFO L226 Difference]: Without dead ends: 923 [2022-11-22 01:46:29,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 183 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 978 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=484, Invalid=2822, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 01:46:29,228 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 207 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 923 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-22 01:46:29,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 440 Invalid, 923 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-22 01:46:29,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 923 states. [2022-11-22 01:46:30,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 923 to 841. [2022-11-22 01:46:30,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 841 states, 449 states have (on average 1.265033407572383) internal successors, (568), 453 states have internal predecessors, (568), 361 states have call successors, (361), 30 states have call predecessors, (361), 30 states have return successors, (360), 357 states have call predecessors, (360), 360 states have call successors, (360) [2022-11-22 01:46:30,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 841 states to 841 states and 1289 transitions. [2022-11-22 01:46:30,316 INFO L78 Accepts]: Start accepts. Automaton has 841 states and 1289 transitions. Word has length 74 [2022-11-22 01:46:30,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:46:30,316 INFO L495 AbstractCegarLoop]: Abstraction has 841 states and 1289 transitions. [2022-11-22 01:46:30,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-22 01:46:30,317 INFO L276 IsEmpty]: Start isEmpty. Operand 841 states and 1289 transitions. [2022-11-22 01:46:30,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-22 01:46:30,319 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:46:30,319 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:46:30,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 01:46:30,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 01:46:30,527 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:46:30,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:46:30,527 INFO L85 PathProgramCache]: Analyzing trace with hash 50382937, now seen corresponding path program 2 times [2022-11-22 01:46:30,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:46:30,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901231097] [2022-11-22 01:46:30,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:46:30,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:46:30,546 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:46:30,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1410117055] [2022-11-22 01:46:30,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:46:30,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:46:30,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:46:30,549 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:46:30,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 01:46:30,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:46:30,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:46:30,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 01:46:30,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:46:30,665 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-11-22 01:46:30,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:46:30,739 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-11-22 01:46:30,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:46:30,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901231097] [2022-11-22 01:46:30,739 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:46:30,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410117055] [2022-11-22 01:46:30,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410117055] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:46:30,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [607456511] [2022-11-22 01:46:30,742 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 01:46:30,742 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:46:30,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:46:30,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:46:30,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:46:36,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:46:36,373 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:46:36,399 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:46:47,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14599#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:46:47,444 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:46:47,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:46:47,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-11-22 01:46:47,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225964932] [2022-11-22 01:46:47,444 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:46:47,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 01:46:47,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:46:47,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 01:46:47,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2022-11-22 01:46:47,446 INFO L87 Difference]: Start difference. First operand 841 states and 1289 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-22 01:46:50,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:46:50,052 INFO L93 Difference]: Finished difference Result 1000 states and 1536 transitions. [2022-11-22 01:46:50,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 01:46:50,053 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 79 [2022-11-22 01:46:50,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:46:50,060 INFO L225 Difference]: With dead ends: 1000 [2022-11-22 01:46:50,060 INFO L226 Difference]: Without dead ends: 993 [2022-11-22 01:46:50,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 205 SyntacticMatches, 8 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=187, Invalid=1219, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:46:50,062 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 58 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 01:46:50,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 215 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 01:46:50,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 993 states. [2022-11-22 01:46:51,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 993 to 796. [2022-11-22 01:46:51,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 414 states have (on average 1.2777777777777777) internal successors, (529), 417 states have internal predecessors, (529), 351 states have call successors, (351), 30 states have call predecessors, (351), 30 states have return successors, (350), 348 states have call predecessors, (350), 350 states have call successors, (350) [2022-11-22 01:46:51,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 1230 transitions. [2022-11-22 01:46:51,679 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 1230 transitions. Word has length 79 [2022-11-22 01:46:51,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:46:51,679 INFO L495 AbstractCegarLoop]: Abstraction has 796 states and 1230 transitions. [2022-11-22 01:46:51,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-22 01:46:51,680 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 1230 transitions. [2022-11-22 01:46:51,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-22 01:46:51,682 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:46:51,682 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:46:51,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 01:46:51,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 01:46:51,888 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:46:51,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:46:51,888 INFO L85 PathProgramCache]: Analyzing trace with hash -372759868, now seen corresponding path program 2 times [2022-11-22 01:46:51,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:46:51,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051214450] [2022-11-22 01:46:51,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:46:51,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:46:51,899 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:46:51,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1901221004] [2022-11-22 01:46:51,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:46:51,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:46:51,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:46:51,901 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:46:51,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 01:46:51,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 01:46:51,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:46:51,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-22 01:46:51,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:46:53,571 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 24 proven. 28 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-11-22 01:46:53,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:46:57,783 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-22 01:46:57,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:46:57,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051214450] [2022-11-22 01:46:57,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:46:57,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901221004] [2022-11-22 01:46:57,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901221004] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:46:57,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184703422] [2022-11-22 01:46:57,786 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 01:46:57,787 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:46:57,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:46:57,787 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:46:57,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:47:04,512 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:47:04,518 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:47:04,543 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:47:44,432 WARN L233 SmtUtils]: Spent 6.23s on a formula simplification. DAG size of input: 68 DAG size of output: 62 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:47:52,013 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18175#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:47:52,014 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:47:52,014 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:47:52,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 30 [2022-11-22 01:47:52,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99776612] [2022-11-22 01:47:52,014 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:47:52,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 01:47:52,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:47:52,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 01:47:52,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1893, Unknown=4, NotChecked=0, Total=2162 [2022-11-22 01:47:52,016 INFO L87 Difference]: Start difference. First operand 796 states and 1230 transitions. Second operand has 30 states, 26 states have (on average 2.0) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 8 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-22 01:48:11,079 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:48:13,716 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:48:29,714 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:48:52,309 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:49:11,519 WARN L233 SmtUtils]: Spent 5.07s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:50:17,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:50:17,138 INFO L93 Difference]: Finished difference Result 1367 states and 2095 transitions. [2022-11-22 01:50:17,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-22 01:50:17,139 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 26 states have (on average 2.0) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 8 states have call predecessors, (28), 9 states have call successors, (28) Word has length 91 [2022-11-22 01:50:17,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:50:17,144 INFO L225 Difference]: With dead ends: 1367 [2022-11-22 01:50:17,144 INFO L226 Difference]: Without dead ends: 1128 [2022-11-22 01:50:17,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 213 SyntacticMatches, 13 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5276 ImplicationChecksByTransitivity, 151.7s TimeCoverageRelationStatistics Valid=2283, Invalid=12719, Unknown=4, NotChecked=0, Total=15006 [2022-11-22 01:50:17,150 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 333 mSDsluCounter, 624 mSDsCounter, 0 mSdLazyCounter, 2480 mSolverCounterSat, 628 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 724 SdHoareTripleChecker+Invalid, 3111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 628 IncrementalHoareTripleChecker+Valid, 2480 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 42.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:50:17,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [342 Valid, 724 Invalid, 3111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [628 Valid, 2480 Invalid, 3 Unknown, 0 Unchecked, 42.5s Time] [2022-11-22 01:50:17,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1128 states. [2022-11-22 01:50:18,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1128 to 953. [2022-11-22 01:50:18,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 953 states, 497 states have (on average 1.2736418511066399) internal successors, (633), 500 states have internal predecessors, (633), 419 states have call successors, (419), 36 states have call predecessors, (419), 36 states have return successors, (418), 416 states have call predecessors, (418), 418 states have call successors, (418) [2022-11-22 01:50:18,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 953 states to 953 states and 1470 transitions. [2022-11-22 01:50:18,532 INFO L78 Accepts]: Start accepts. Automaton has 953 states and 1470 transitions. Word has length 91 [2022-11-22 01:50:18,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:50:18,532 INFO L495 AbstractCegarLoop]: Abstraction has 953 states and 1470 transitions. [2022-11-22 01:50:18,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 26 states have (on average 2.0) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 8 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-22 01:50:18,533 INFO L276 IsEmpty]: Start isEmpty. Operand 953 states and 1470 transitions. [2022-11-22 01:50:18,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-22 01:50:18,537 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:50:18,537 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:50:18,544 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-22 01:50:18,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 01:50:18,743 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:50:18,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:50:18,743 INFO L85 PathProgramCache]: Analyzing trace with hash 1852640491, now seen corresponding path program 1 times [2022-11-22 01:50:18,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:50:18,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420077933] [2022-11-22 01:50:18,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:50:18,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:50:18,766 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:50:18,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [627421595] [2022-11-22 01:50:18,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:50:18,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:50:18,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:50:18,770 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:50:18,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 01:50:18,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:50:18,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-22 01:50:18,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:50:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 61 proven. 57 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2022-11-22 01:50:20,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:50:23,518 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 62 proven. 55 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2022-11-22 01:50:23,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:50:23,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420077933] [2022-11-22 01:50:23,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:50:23,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627421595] [2022-11-22 01:50:23,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627421595] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:50:23,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [808906149] [2022-11-22 01:50:23,521 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 01:50:23,521 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:50:23,521 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:50:23,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:50:23,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:50:29,866 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:50:29,870 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:50:29,888 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:51:14,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22820#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:51:14,093 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:51:14,093 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:51:14,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 36 [2022-11-22 01:51:14,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936439389] [2022-11-22 01:51:14,094 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:51:14,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 01:51:14,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:51:14,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 01:51:14,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=2292, Unknown=4, NotChecked=0, Total=2652 [2022-11-22 01:51:14,096 INFO L87 Difference]: Start difference. First operand 953 states and 1470 transitions. Second operand has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 12 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 01:51:23,080 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:51:25,381 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:51:27,867 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:51:54,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:51:54,216 INFO L93 Difference]: Finished difference Result 1165 states and 1755 transitions. [2022-11-22 01:51:54,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-22 01:51:54,217 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 12 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) Word has length 104 [2022-11-22 01:51:54,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:51:54,223 INFO L225 Difference]: With dead ends: 1165 [2022-11-22 01:51:54,223 INFO L226 Difference]: Without dead ends: 1163 [2022-11-22 01:51:54,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 243 SyntacticMatches, 18 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3413 ImplicationChecksByTransitivity, 64.4s TimeCoverageRelationStatistics Valid=1372, Invalid=7366, Unknown=4, NotChecked=0, Total=8742 [2022-11-22 01:51:54,225 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 350 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 2039 mSolverCounterSat, 660 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 2701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 660 IncrementalHoareTripleChecker+Valid, 2039 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:51:54,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [350 Valid, 297 Invalid, 2701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [660 Valid, 2039 Invalid, 2 Unknown, 0 Unchecked, 20.0s Time] [2022-11-22 01:51:54,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1163 states. [2022-11-22 01:51:56,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1163 to 1132. [2022-11-22 01:51:56,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1132 states, 602 states have (on average 1.2574750830564785) internal successors, (757), 609 states have internal predecessors, (757), 483 states have call successors, (483), 46 states have call predecessors, (483), 46 states have return successors, (482), 476 states have call predecessors, (482), 482 states have call successors, (482) [2022-11-22 01:51:56,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1722 transitions. [2022-11-22 01:51:56,132 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1722 transitions. Word has length 104 [2022-11-22 01:51:56,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:51:56,133 INFO L495 AbstractCegarLoop]: Abstraction has 1132 states and 1722 transitions. [2022-11-22 01:51:56,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 12 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 01:51:56,133 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1722 transitions. [2022-11-22 01:51:56,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-22 01:51:56,136 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:51:56,137 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:51:56,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 01:51:56,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 01:51:56,348 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:51:56,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:51:56,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1040462752, now seen corresponding path program 3 times [2022-11-22 01:51:56,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:51:56,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417469336] [2022-11-22 01:51:56,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:51:56,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:51:56,359 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:51:56,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1234227870] [2022-11-22 01:51:56,359 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:51:56,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:51:56,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:51:56,361 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:51:56,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2257e40-36f2-4de6-adc9-0726d9e8f959/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 01:51:56,440 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:51:56,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:51:56,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-22 01:51:56,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:51:58,025 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 70 proven. 64 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2022-11-22 01:51:58,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:52:13,029 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 437 trivial. 0 not checked. [2022-11-22 01:52:13,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:52:13,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417469336] [2022-11-22 01:52:13,029 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:52:13,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234227870] [2022-11-22 01:52:13,029 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234227870] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:52:13,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1187412273] [2022-11-22 01:52:13,031 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 01:52:13,031 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:52:13,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:52:13,032 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:52:13,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:52:21,599 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2022-11-22 01:52:21,604 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-22 01:52:21,625 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:52:55,170 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27426#(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 [2022-11-22 01:52:55,170 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:52:55,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:52:55,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-22 01:52:55,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923545048] [2022-11-22 01:52:55,170 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:52:55,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 01:52:55,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:52:55,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 01:52:55,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=2725, Unknown=2, NotChecked=0, Total=3080 [2022-11-22 01:52:55,172 INFO L87 Difference]: Start difference. First operand 1132 states and 1722 transitions. Second operand has 37 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 35 states have internal predecessors, (70), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-11-22 01:53:02,577 WARN L233 SmtUtils]: Spent 5.15s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:53:12,691 WARN L233 SmtUtils]: Spent 7.87s on a formula simplification that was a NOOP. DAG size: 112 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:53:28,525 WARN L233 SmtUtils]: Spent 10.64s on a formula simplification that was a NOOP. DAG size: 121 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:53:34,594 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:53:36,613 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:53:38,617 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:53:40,641 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:53:42,643 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:53:48,170 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:53:59,210 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:06,375 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:11,815 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:13,855 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:15,859 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:22,128 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:29,861 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:32,968 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:35,761 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:39,653 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:54:55,769 WARN L233 SmtUtils]: Spent 5.34s on a formula simplification that was a NOOP. DAG size: 122 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:55:00,101 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:55:10,896 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:55:37,525 WARN L233 SmtUtils]: Spent 15.92s on a formula simplification. DAG size of input: 117 DAG size of output: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)