./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+newton_2_3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh --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 9a3e0b52eabe0a038e4774a376f7ed1eb95ce84c8d3569b2d9d7df15f27e8bd7 --- 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-2329fc7 [2022-12-14 14:16:58,501 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 14:16:58,503 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 14:16:58,516 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 14:16:58,517 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 14:16:58,518 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 14:16:58,518 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 14:16:58,520 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 14:16:58,521 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 14:16:58,521 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 14:16:58,522 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 14:16:58,523 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 14:16:58,523 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 14:16:58,524 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 14:16:58,525 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 14:16:58,525 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 14:16:58,526 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 14:16:58,527 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 14:16:58,528 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 14:16:58,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 14:16:58,530 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 14:16:58,532 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 14:16:58,533 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 14:16:58,535 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 14:16:58,541 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 14:16:58,542 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 14:16:58,542 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 14:16:58,544 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 14:16:58,544 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 14:16:58,546 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 14:16:58,546 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 14:16:58,547 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 14:16:58,548 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 14:16:58,549 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 14:16:58,550 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 14:16:58,550 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 14:16:58,551 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 14:16:58,551 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 14:16:58,552 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 14:16:58,553 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 14:16:58,553 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 14:16:58,554 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 14:16:58,575 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 14:16:58,575 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 14:16:58,575 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 14:16:58,576 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 14:16:58,576 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 14:16:58,576 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 14:16:58,577 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 14:16:58,577 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 14:16:58,577 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 14:16:58,577 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 14:16:58,577 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 14:16:58,578 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 14:16:58,578 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 14:16:58,578 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 14:16:58,578 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 14:16:58,578 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 14:16:58,579 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 14:16:58,579 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 14:16:58,579 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 14:16:58,580 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 14:16:58,580 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 14:16:58,580 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 14:16:58,580 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 14:16:58,580 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 14:16:58,580 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 14:16:58,581 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 14:16:58,581 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 14:16:58,581 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 14:16:58,581 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 14:16:58,581 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 14:16:58,582 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 14:16:58,582 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 14:16:58,582 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:16:58,582 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 14:16:58,582 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 14:16:58,582 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 14:16:58,583 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 14:16:58,583 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 14:16:58,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 14:16:58,588 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 14:16:58,588 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 14:16:58,588 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_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9a3e0b52eabe0a038e4774a376f7ed1eb95ce84c8d3569b2d9d7df15f27e8bd7 [2022-12-14 14:16:58,777 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 14:16:58,796 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 14:16:58,797 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 14:16:58,798 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 14:16:58,799 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 14:16:58,799 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/combinations/gcd_1+newton_2_3.i [2022-12-14 14:17:01,421 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 14:17:01,567 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 14:17:01,567 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/sv-benchmarks/c/combinations/gcd_1+newton_2_3.i [2022-12-14 14:17:01,572 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/data/ed131597c/2bcf07a7999b46dc94b72d78f30289cc/FLAGf1a6eccb1 [2022-12-14 14:17:01,586 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/data/ed131597c/2bcf07a7999b46dc94b72d78f30289cc [2022-12-14 14:17:01,588 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 14:17:01,589 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 14:17:01,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 14:17:01,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 14:17:01,593 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 14:17:01,593 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,594 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f9922de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01, skipping insertion in model container [2022-12-14 14:17:01,594 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,600 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 14:17:01,613 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 14:17:01,718 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_92e81396-ff29-4e05-8a74-ac421728d21a/sv-benchmarks/c/combinations/gcd_1+newton_2_3.i[1226,1239] [2022-12-14 14:17:01,735 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_92e81396-ff29-4e05-8a74-ac421728d21a/sv-benchmarks/c/combinations/gcd_1+newton_2_3.i[2807,2820] [2022-12-14 14:17:01,736 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:17:01,743 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 14:17:01,752 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_92e81396-ff29-4e05-8a74-ac421728d21a/sv-benchmarks/c/combinations/gcd_1+newton_2_3.i[1226,1239] [2022-12-14 14:17:01,759 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_92e81396-ff29-4e05-8a74-ac421728d21a/sv-benchmarks/c/combinations/gcd_1+newton_2_3.i[2807,2820] [2022-12-14 14:17:01,760 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:17:01,770 INFO L208 MainTranslator]: Completed translation [2022-12-14 14:17:01,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01 WrapperNode [2022-12-14 14:17:01,771 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 14:17:01,772 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 14:17:01,772 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 14:17:01,772 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 14:17:01,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,783 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,798 INFO L138 Inliner]: procedures = 27, calls = 24, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 85 [2022-12-14 14:17:01,799 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 14:17:01,799 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 14:17:01,799 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 14:17:01,799 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 14:17:01,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,812 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,814 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,815 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,816 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,817 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 14:17:01,818 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 14:17:01,818 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 14:17:01,818 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 14:17:01,819 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (1/1) ... [2022-12-14 14:17:01,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:17:01,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:17:01,843 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 14:17:01,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 14:17:01,891 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 14:17:01,891 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2022-12-14 14:17:01,892 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2022-12-14 14:17:01,892 INFO L130 BoogieDeclarations]: Found specification of procedure f [2022-12-14 14:17:01,892 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2022-12-14 14:17:01,892 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 14:17:01,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 14:17:01,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 14:17:01,968 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 14:17:01,970 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 14:17:02,101 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 14:17:02,154 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 14:17:02,154 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 14:17:02,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:17:02 BoogieIcfgContainer [2022-12-14 14:17:02,156 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 14:17:02,159 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 14:17:02,159 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 14:17:02,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 14:17:02,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 02:17:01" (1/3) ... [2022-12-14 14:17:02,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79756de3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:17:02, skipping insertion in model container [2022-12-14 14:17:02,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:17:01" (2/3) ... [2022-12-14 14:17:02,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79756de3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:17:02, skipping insertion in model container [2022-12-14 14:17:02,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:17:02" (3/3) ... [2022-12-14 14:17:02,165 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_3.i [2022-12-14 14:17:02,181 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 14:17:02,181 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-12-14 14:17:02,213 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 14:17:02,218 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;@1673fe16, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 14:17:02,218 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-12-14 14:17:02,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 14:17:02,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 14:17:02,227 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:17:02,227 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 14:17:02,228 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:17:02,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:17:02,233 INFO L85 PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times [2022-12-14 14:17:02,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:17:02,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98206995] [2022-12-14 14:17:02,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:17:02,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:17:02,317 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:17:02,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1695501580] [2022-12-14 14:17:02,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:17:02,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:17:02,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:17:02,319 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:17:02,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 14:17:02,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:17:02,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 14:17:02,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:17:02,456 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:17:02,456 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:17:02,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:17:02,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98206995] [2022-12-14 14:17:02,457 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:17:02,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695501580] [2022-12-14 14:17:02,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695501580] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:17:02,458 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:17:02,458 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:17:02,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463964695] [2022-12-14 14:17:02,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:17:02,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:17:02,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:17:02,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:17:02,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:17:02,485 INFO L87 Difference]: Start difference. First operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:17:02,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:17:02,522 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2022-12-14 14:17:02,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:17:02,524 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 14:17:02,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:17:02,528 INFO L225 Difference]: With dead ends: 34 [2022-12-14 14:17:02,528 INFO L226 Difference]: Without dead ends: 21 [2022-12-14 14:17:02,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:17:02,532 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:17:02,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:17:02,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-12-14 14:17:02,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-12-14 14:17:02,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 14:17:02,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-12-14 14:17:02,557 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2022-12-14 14:17:02,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:17:02,557 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-12-14 14:17:02,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:17:02,557 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-12-14 14:17:02,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 14:17:02,558 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:17:02,558 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:17:02,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 14:17:02,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-12-14 14:17:02,760 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:17:02,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:17:02,762 INFO L85 PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times [2022-12-14 14:17:02,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:17:02,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020108910] [2022-12-14 14:17:02,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:17:02,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:17:02,796 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:17:02,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [794302018] [2022-12-14 14:17:02,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:17:02,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:17:02,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:17:02,801 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:17:02,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 14:17:02,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:17:02,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 14:17:02,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:17:03,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:17:03,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:17:03,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:17:03,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:17:03,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020108910] [2022-12-14 14:17:03,102 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:17:03,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794302018] [2022-12-14 14:17:03,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794302018] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:17:03,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238523491] [2022-12-14 14:17:03,122 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 14:17:03,122 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:17:03,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:17:03,131 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:17:03,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:17:03,348 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:17:03,595 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '167#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:17:03,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:17:03,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:17:03,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-12-14 14:17:03,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280363253] [2022-12-14 14:17:03,596 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:17:03,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 14:17:03,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:17:03,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 14:17:03,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-12-14 14:17:03,597 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:17:03,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:17:03,641 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-12-14 14:17:03,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 14:17:03,641 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 14:17:03,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:17:03,642 INFO L225 Difference]: With dead ends: 25 [2022-12-14 14:17:03,642 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 14:17:03,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-12-14 14:17:03,644 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:17:03,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 57 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:17:03,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 14:17:03,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-12-14 14:17:03,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 14:17:03,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-12-14 14:17:03,648 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2022-12-14 14:17:03,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:17:03,649 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-12-14 14:17:03,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:17:03,649 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-12-14 14:17:03,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 14:17:03,649 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:17:03,650 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2022-12-14 14:17:03,654 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 14:17:03,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-12-14 14:17:03,851 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:17:03,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:17:03,852 INFO L85 PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times [2022-12-14 14:17:03,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:17:03,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861992181] [2022-12-14 14:17:03,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:17:03,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:17:03,878 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:17:03,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [790387377] [2022-12-14 14:17:03,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:17:03,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:17:03,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:17:03,884 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:17:03,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 14:17:16,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 14:17:16,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:17:16,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 14:17:16,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:17:37,721 WARN L233 SmtUtils]: Spent 7.00s on a formula simplification that was a NOOP. DAG size: 35 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:17:56,218 WARN L233 SmtUtils]: Spent 9.39s on a formula simplification. DAG size of input: 47 DAG size of output: 25 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:18:18,032 WARN L837 $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse0) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= 0 .cse0)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0))))) is different from false [2022-12-14 14:18:50,822 WARN L837 $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |ULTIMATE.start_main1_~y~0#1|) 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (not (= .cse0 0))))) (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0)) is different from false [2022-12-14 14:19:10,538 WARN L837 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |ULTIMATE.start_main1_~y~0#1|) 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (not (= .cse0 0))))) is different from false [2022-12-14 14:19:12,541 WARN L859 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |ULTIMATE.start_main1_~y~0#1|) 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (not (= .cse0 0))))) is different from true [2022-12-14 14:19:12,541 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-12-14 14:19:12,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:23:20,938 WARN L233 SmtUtils]: Spent 2.93m on a formula simplification that was a NOOP. DAG size: 124 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:25:20,386 WARN L233 SmtUtils]: Spent 1.17m on a formula simplification. DAG size of input: 45 DAG size of output: 41 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:25:40,289 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:25:40,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:25:40,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861992181] [2022-12-14 14:25:40,290 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:25:40,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790387377] [2022-12-14 14:25:40,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790387377] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:25:40,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [175923385] [2022-12-14 14:25:40,291 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 14:25:40,291 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:25:40,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:25:40,291 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:25:40,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:25:44,349 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:26:01,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '294#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|))' at error location [2022-12-14 14:26:01,957 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:26:01,957 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:26:01,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2022-12-14 14:26:01,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331459792] [2022-12-14 14:26:01,958 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:26:01,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 14:26:01,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:26:01,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 14:26:01,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=135, Unknown=19, NotChecked=78, Total=272 [2022-12-14 14:26:01,959 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:26:03,746 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:27:00,340 WARN L233 SmtUtils]: Spent 50.46s on a formula simplification. DAG size of input: 46 DAG size of output: 30 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:27:02,455 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 [] [2022-12-14 14:27:04,513 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (< 0 |c_ULTIMATE.start_main1_~y~0#1|))) (and (<= |c_ULTIMATE.start_main1_~x~0#1| 127) .cse0 (<= 0 (+ 128 |c_ULTIMATE.start_main1_~x~0#1|)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (= |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~b#1|) (or (not (= (mod |c_ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (let ((.cse3 (mod (* 255 |c_ULTIMATE.start_main1_~x~0#1|) 256))) (let ((.cse2 (<= .cse3 127))) (and (let ((.cse1 (mod (+ .cse3 (- 256)) |c_ULTIMATE.start_main1_~y~0#1|))) (or (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| (+ (- 256) (mod (+ .cse1 (* |c_ULTIMATE.start_main1_~y~0#1| 255)) 256))) 256) 0)) .cse2 (= .cse1 0))) (let ((.cse4 (mod (mod .cse3 |c_ULTIMATE.start_main1_~y~0#1|) 256))) (or (not .cse2) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse4) 256) 0)) (= .cse4 0)))))) (not .cse0) (not (< |c_ULTIMATE.start_main1_~x~0#1| 0))) (or (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse5 (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (<= .cse5 127)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse5)))) (and (<= |c_ULTIMATE.start_gcd_test_~a#1| 127) (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|) (= (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse6 (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= .cse6 127) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse6))))) (or (let ((.cse39 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse26 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse40 (mod (+ .cse39 |c_ULTIMATE.start_gcd_test_~b#1|) 256)) (.cse41 (mod (+ .cse39 (* |c_ULTIMATE.start_gcd_test_~b#1| 255)) 256))) (let ((.cse25 (mod .cse39 256)) (.cse12 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse16 (<= .cse41 127)) (.cse7 (<= .cse40 127)) (.cse32 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse40) 256) 0))) (.cse34 (= .cse40 0)) (.cse35 (= |c_ULTIMATE.start_main1_~y~0#1| .cse40)) (.cse36 (= .cse41 0)) (.cse37 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse41) 256) 0))) (.cse20 (not .cse26)) (.cse38 (= |c_ULTIMATE.start_main1_~y~0#1| .cse41)) (.cse27 (+ |c_ULTIMATE.start_main1_~y~0#1| 256))) (let ((.cse18 (= .cse41 .cse27)) (.cse19 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse41)) 256) 0))) (.cse13 (or .cse36 .cse37 .cse20 .cse38)) (.cse24 (or .cse32 .cse20 .cse34 .cse35)) (.cse10 (not .cse7)) (.cse15 (not .cse16)) (.cse21 (not .cse12)) (.cse22 (= .cse40 .cse27)) (.cse23 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse40)) 256) 0))) (.cse28 (<= .cse25 127))) (and (or (let ((.cse14 (or (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse25)) 256) 0)) .cse26 (= .cse25 .cse27)))) (let ((.cse11 (or .cse21 (and .cse24 .cse14))) (.cse8 (or .cse21 (and .cse14 (or .cse22 .cse23 .cse20))))) (and (or (let ((.cse9 (or .cse12 (and .cse13 .cse14)))) (and (or .cse7 (and .cse8 .cse9)) (or .cse10 (and .cse11 .cse9)))) .cse15) (or .cse16 (let ((.cse17 (or (and .cse14 (or .cse18 .cse19 .cse20)) .cse12))) (and (or .cse10 (and .cse17 .cse11)) (or .cse7 (and .cse17 .cse8)))))))) .cse28) (or (let ((.cse31 (or .cse26 (= |c_ULTIMATE.start_main1_~y~0#1| .cse25) (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse25) 256) 0)) (= .cse25 0))) (.cse33 (= .cse39 0))) (let ((.cse29 (or .cse21 (and .cse31 (or .cse33 .cse22 .cse23 .cse20))))) (and (or .cse16 (let ((.cse30 (or (and .cse31 (or .cse33 .cse18 .cse19 .cse20)) .cse12))) (and (or (and .cse29 .cse30) .cse7) (or (and (or .cse21 (and .cse31 (or .cse32 .cse33 .cse20 .cse34 .cse35))) .cse30) .cse10)))) (or (and (or (and (or (and .cse13 .cse31) .cse12) (or .cse21 (and .cse31 .cse24))) .cse10) (or .cse7 (and (or (and .cse31 (or .cse33 .cse36 .cse37 .cse20 .cse38)) .cse12) .cse29))) .cse15)))) (not .cse28))))))) (= |c_ULTIMATE.start_gcd_test_~b#1| 0)))) is different from false [2022-12-14 14:27:06,518 WARN L859 $PredicateComparison]: unable to prove that (let ((.cse0 (< 0 |c_ULTIMATE.start_main1_~y~0#1|))) (and (<= |c_ULTIMATE.start_main1_~x~0#1| 127) .cse0 (<= 0 (+ 128 |c_ULTIMATE.start_main1_~x~0#1|)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (= |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~b#1|) (or (not (= (mod |c_ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (let ((.cse3 (mod (* 255 |c_ULTIMATE.start_main1_~x~0#1|) 256))) (let ((.cse2 (<= .cse3 127))) (and (let ((.cse1 (mod (+ .cse3 (- 256)) |c_ULTIMATE.start_main1_~y~0#1|))) (or (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| (+ (- 256) (mod (+ .cse1 (* |c_ULTIMATE.start_main1_~y~0#1| 255)) 256))) 256) 0)) .cse2 (= .cse1 0))) (let ((.cse4 (mod (mod .cse3 |c_ULTIMATE.start_main1_~y~0#1|) 256))) (or (not .cse2) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse4) 256) 0)) (= .cse4 0)))))) (not .cse0) (not (< |c_ULTIMATE.start_main1_~x~0#1| 0))) (or (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse5 (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (<= .cse5 127)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse5)))) (and (<= |c_ULTIMATE.start_gcd_test_~a#1| 127) (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|) (= (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse6 (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= .cse6 127) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse6))))) (or (let ((.cse39 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse26 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse40 (mod (+ .cse39 |c_ULTIMATE.start_gcd_test_~b#1|) 256)) (.cse41 (mod (+ .cse39 (* |c_ULTIMATE.start_gcd_test_~b#1| 255)) 256))) (let ((.cse25 (mod .cse39 256)) (.cse12 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse16 (<= .cse41 127)) (.cse7 (<= .cse40 127)) (.cse32 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse40) 256) 0))) (.cse34 (= .cse40 0)) (.cse35 (= |c_ULTIMATE.start_main1_~y~0#1| .cse40)) (.cse36 (= .cse41 0)) (.cse37 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse41) 256) 0))) (.cse20 (not .cse26)) (.cse38 (= |c_ULTIMATE.start_main1_~y~0#1| .cse41)) (.cse27 (+ |c_ULTIMATE.start_main1_~y~0#1| 256))) (let ((.cse18 (= .cse41 .cse27)) (.cse19 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse41)) 256) 0))) (.cse13 (or .cse36 .cse37 .cse20 .cse38)) (.cse24 (or .cse32 .cse20 .cse34 .cse35)) (.cse10 (not .cse7)) (.cse15 (not .cse16)) (.cse21 (not .cse12)) (.cse22 (= .cse40 .cse27)) (.cse23 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse40)) 256) 0))) (.cse28 (<= .cse25 127))) (and (or (let ((.cse14 (or (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse25)) 256) 0)) .cse26 (= .cse25 .cse27)))) (let ((.cse11 (or .cse21 (and .cse24 .cse14))) (.cse8 (or .cse21 (and .cse14 (or .cse22 .cse23 .cse20))))) (and (or (let ((.cse9 (or .cse12 (and .cse13 .cse14)))) (and (or .cse7 (and .cse8 .cse9)) (or .cse10 (and .cse11 .cse9)))) .cse15) (or .cse16 (let ((.cse17 (or (and .cse14 (or .cse18 .cse19 .cse20)) .cse12))) (and (or .cse10 (and .cse17 .cse11)) (or .cse7 (and .cse17 .cse8)))))))) .cse28) (or (let ((.cse31 (or .cse26 (= |c_ULTIMATE.start_main1_~y~0#1| .cse25) (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse25) 256) 0)) (= .cse25 0))) (.cse33 (= .cse39 0))) (let ((.cse29 (or .cse21 (and .cse31 (or .cse33 .cse22 .cse23 .cse20))))) (and (or .cse16 (let ((.cse30 (or (and .cse31 (or .cse33 .cse18 .cse19 .cse20)) .cse12))) (and (or (and .cse29 .cse30) .cse7) (or (and (or .cse21 (and .cse31 (or .cse32 .cse33 .cse20 .cse34 .cse35))) .cse30) .cse10)))) (or (and (or (and (or (and .cse13 .cse31) .cse12) (or .cse21 (and .cse31 .cse24))) .cse10) (or .cse7 (and (or (and .cse31 (or .cse33 .cse36 .cse37 .cse20 .cse38)) .cse12) .cse29))) .cse15)))) (not .cse28))))))) (= |c_ULTIMATE.start_gcd_test_~b#1| 0)))) is different from true [2022-12-14 14:27:40,499 WARN L233 SmtUtils]: Spent 24.68s on a formula simplification. DAG size of input: 37 DAG size of output: 31 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:27:42,505 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:27:44,510 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:27:46,516 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-12-14 14:27:48,522 WARN L837 $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse0) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= 0 .cse0)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0)))) (or (not (= |c_ULTIMATE.start_gcd_test_~b#1| 0)) (not (<= |c_ULTIMATE.start_gcd_test_~a#1| 127)) (= |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) (not (<= 0 (+ |c_ULTIMATE.start_gcd_test_~a#1| 128))))) is different from false [2022-12-14 14:27:50,531 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:31:08,014 WARN L233 SmtUtils]: Spent 3.22m on a formula simplification that was a NOOP. DAG size: 134 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:31:10,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:31:12,617 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:31:14,626 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 [] [2022-12-14 14:31:14,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:31:14,628 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-12-14 14:31:14,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 14:31:14,631 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 14:31:14,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:31:14,632 INFO L225 Difference]: With dead ends: 26 [2022-12-14 14:31:14,632 INFO L226 Difference]: Without dead ends: 23 [2022-12-14 14:31:14,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 611.8s TimeCoverageRelationStatistics Valid=59, Invalid=203, Unknown=30, NotChecked=170, Total=462 [2022-12-14 14:31:14,633 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 18.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:31:14,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 118 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 8 Unknown, 41 Unchecked, 18.6s Time] [2022-12-14 14:31:14,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-12-14 14:31:14,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-12-14 14:31:14,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 14:31:14,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-12-14 14:31:14,638 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8 [2022-12-14 14:31:14,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:31:14,638 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-12-14 14:31:14,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:31:14,638 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-12-14 14:31:14,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 14:31:14,638 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:31:14,638 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-12-14 14:31:14,645 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 14:31:14,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:31:14,840 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:31:14,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:31:14,841 INFO L85 PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times [2022-12-14 14:31:14,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:31:14,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020627171] [2022-12-14 14:31:14,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:31:14,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:31:14,852 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:31:14,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1382613096] [2022-12-14 14:31:14,852 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:31:14,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:31:14,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:31:14,853 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:31:14,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92e81396-ff29-4e05-8a74-ac421728d21a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 14:31:21,855 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:31:21,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:31:21,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 14:31:21,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:31:34,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 14:31:34,133 INFO L328 TraceCheckSpWp]: Computing backward predicates...