./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c --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_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/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_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/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_c8f66c15-a8c1-433f-baa0-20a91bde219a/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 2d26d8e14d33b8c29eaf9ffa7603dd26966f962451e6c0726b154a73bf65f3d2 --- 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 15:33:11,657 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:33:11,659 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:33:11,677 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:33:11,678 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:33:11,679 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:33:11,680 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:33:11,682 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:33:11,683 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:33:11,684 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:33:11,685 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:33:11,686 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:33:11,686 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:33:11,687 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:33:11,688 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:33:11,689 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:33:11,690 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:33:11,691 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:33:11,693 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:33:11,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:33:11,696 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:33:11,697 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:33:11,698 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:33:11,699 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:33:11,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:33:11,703 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:33:11,703 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:33:11,704 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:33:11,705 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:33:11,706 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:33:11,706 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:33:11,707 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:33:11,707 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:33:11,708 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:33:11,709 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:33:11,709 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:33:11,710 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:33:11,710 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:33:11,710 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:33:11,711 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:33:11,712 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:33:11,713 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:33:11,735 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:33:11,735 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:33:11,735 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:33:11,735 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:33:11,736 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:33:11,736 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:33:11,736 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:33:11,737 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:33:11,737 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:33:11,737 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:33:11,737 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:33:11,737 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:33:11,738 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:33:11,738 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:33:11,738 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:33:11,738 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:33:11,738 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:33:11,739 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:33:11,739 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:33:11,740 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:33:11,740 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:33:11,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:33:11,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:33:11,740 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:33:11,741 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:33:11,741 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:33:11,741 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:33:11,741 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:33:11,741 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:33:11,741 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:33:11,742 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:33:11,742 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:33:11,742 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:33:11,742 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:33:11,743 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:33:11,743 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:33:11,743 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:33:11,743 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:33:11,743 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:33:11,743 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:33:11,744 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:33:11,744 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_c8f66c15-a8c1-433f-baa0-20a91bde219a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2d26d8e14d33b8c29eaf9ffa7603dd26966f962451e6c0726b154a73bf65f3d2 [2022-12-14 15:33:11,937 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:33:11,955 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:33:11,957 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:33:11,958 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:33:11,959 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:33:11,960 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2022-12-14 15:33:14,484 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:33:14,605 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:33:14,605 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2022-12-14 15:33:14,611 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/data/c6b4c3955/7477f7bc238f4389b803a33308fcf54a/FLAGf157dc46a [2022-12-14 15:33:14,623 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/data/c6b4c3955/7477f7bc238f4389b803a33308fcf54a [2022-12-14 15:33:14,626 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:33:14,627 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:33:14,628 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:33:14,628 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:33:14,631 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:33:14,632 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,633 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@89c72ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14, skipping insertion in model container [2022-12-14 15:33:14,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,641 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:33:14,655 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:33:14,782 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_c8f66c15-a8c1-433f-baa0-20a91bde219a/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2022-12-14 15:33:14,800 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:33:14,809 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:33:14,821 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_c8f66c15-a8c1-433f-baa0-20a91bde219a/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2022-12-14 15:33:14,828 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:33:14,842 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:33:14,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14 WrapperNode [2022-12-14 15:33:14,842 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:33:14,843 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:33:14,844 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:33:14,844 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:33:14,851 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,857 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,872 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 59 [2022-12-14 15:33:14,873 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:33:14,873 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:33:14,874 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:33:14,874 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:33:14,893 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,895 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,895 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,900 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,901 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,902 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,904 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:33:14,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:33:14,905 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:33:14,905 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:33:14,906 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (1/1) ... [2022-12-14 15:33:14,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:33:14,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:14,933 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:33:14,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:33:14,965 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:33:14,965 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 15:33:14,965 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 15:33:14,965 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:33:14,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:33:14,965 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:33:14,965 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 15:33:14,966 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 15:33:15,022 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:33:15,023 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:33:15,130 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:33:15,160 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:33:15,160 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 15:33:15,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:33:15 BoogieIcfgContainer [2022-12-14 15:33:15,163 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:33:15,165 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:33:15,165 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:33:15,169 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:33:15,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:33:14" (1/3) ... [2022-12-14 15:33:15,169 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@274071d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:33:15, skipping insertion in model container [2022-12-14 15:33:15,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:33:14" (2/3) ... [2022-12-14 15:33:15,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@274071d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:33:15, skipping insertion in model container [2022-12-14 15:33:15,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:33:15" (3/3) ... [2022-12-14 15:33:15,171 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd-ll_unwindbound50.c [2022-12-14 15:33:15,190 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:33:15,190 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:33:15,226 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:33:15,231 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;@76bf7e99, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:33:15,231 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:33:15,234 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 15:33:15,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 15:33:15,240 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:15,240 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:15,240 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:15,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:15,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1798315609, now seen corresponding path program 1 times [2022-12-14 15:33:15,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:15,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813904589] [2022-12-14 15:33:15,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:15,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:15,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:15,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:33:15,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:15,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813904589] [2022-12-14 15:33:15,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813904589] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:15,358 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:33:15,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 15:33:15,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966266856] [2022-12-14 15:33:15,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:15,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 15:33:15,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:15,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 15:33:15,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 15:33:15,386 INFO L87 Difference]: Start difference. First operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 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) [2022-12-14 15:33:15,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:15,410 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2022-12-14 15:33:15,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 15:33:15,412 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 [2022-12-14 15:33:15,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:15,418 INFO L225 Difference]: With dead ends: 42 [2022-12-14 15:33:15,418 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 15:33:15,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 15:33:15,423 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:15,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:33:15,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 15:33:15,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-12-14 15:33:15,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 15:33:15,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2022-12-14 15:33:15,449 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2022-12-14 15:33:15,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:15,450 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2022-12-14 15:33:15,450 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) [2022-12-14 15:33:15,451 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2022-12-14 15:33:15,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 15:33:15,451 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:15,451 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:15,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:33:15,452 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:15,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:15,452 INFO L85 PathProgramCache]: Analyzing trace with hash -740021117, now seen corresponding path program 1 times [2022-12-14 15:33:15,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:15,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152533924] [2022-12-14 15:33:15,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:15,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:15,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:15,546 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:33:15,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:15,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152533924] [2022-12-14 15:33:15,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152533924] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:15,546 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:33:15,546 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 15:33:15,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234523488] [2022-12-14 15:33:15,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:15,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:33:15,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:15,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:33:15,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:33:15,549 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2022-12-14 15:33:15,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:15,579 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2022-12-14 15:33:15,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:33:15,580 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 14 [2022-12-14 15:33:15,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:15,580 INFO L225 Difference]: With dead ends: 34 [2022-12-14 15:33:15,581 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 15:33:15,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:33:15,583 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:15,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 69 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:33:15,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 15:33:15,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-12-14 15:33:15,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 15:33:15,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-12-14 15:33:15,590 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 14 [2022-12-14 15:33:15,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:15,590 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-12-14 15:33:15,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2022-12-14 15:33:15,590 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-12-14 15:33:15,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 15:33:15,591 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:15,591 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:15,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 15:33:15,591 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:15,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:15,591 INFO L85 PathProgramCache]: Analyzing trace with hash -738352821, now seen corresponding path program 1 times [2022-12-14 15:33:15,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:15,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081498803] [2022-12-14 15:33:15,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:15,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:15,603 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:15,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1835340415] [2022-12-14 15:33:15,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:15,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:15,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:15,605 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:15,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:33:15,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:15,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 15:33:15,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:15,749 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:33:15,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:33:15,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:15,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081498803] [2022-12-14 15:33:15,750 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:15,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835340415] [2022-12-14 15:33:15,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835340415] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:15,750 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:33:15,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 15:33:15,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188066964] [2022-12-14 15:33:15,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:15,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 15:33:15,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:15,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 15:33:15,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 15:33:15,752 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 15:33:15,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:15,825 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2022-12-14 15:33:15,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 15:33:15,826 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-12-14 15:33:15,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:15,826 INFO L225 Difference]: With dead ends: 38 [2022-12-14 15:33:15,827 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 15:33:15,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-12-14 15:33:15,828 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 6 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:15,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 109 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:33:15,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 15:33:15,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-12-14 15:33:15,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 15 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-12-14 15:33:15,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 49 transitions. [2022-12-14 15:33:15,838 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 49 transitions. Word has length 14 [2022-12-14 15:33:15,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:15,839 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 49 transitions. [2022-12-14 15:33:15,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 15:33:15,839 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 49 transitions. [2022-12-14 15:33:15,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 15:33:15,840 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:15,840 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:15,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:33:16,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:16,042 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:16,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:16,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1930727335, now seen corresponding path program 1 times [2022-12-14 15:33:16,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:16,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684448227] [2022-12-14 15:33:16,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:16,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:16,091 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:16,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [990384045] [2022-12-14 15:33:16,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:16,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:16,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:16,097 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:16,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:33:16,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:16,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:33:16,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:16,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:33:16,319 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:33:16,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:16,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684448227] [2022-12-14 15:33:16,320 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:16,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990384045] [2022-12-14 15:33:16,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990384045] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:16,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:33:16,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 15:33:16,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497398094] [2022-12-14 15:33:16,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:16,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 15:33:16,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:16,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 15:33:16,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-12-14 15:33:16,322 INFO L87 Difference]: Start difference. First operand 35 states and 49 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, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 15:33:16,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:16,415 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2022-12-14 15:33:16,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:33:16,415 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, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2022-12-14 15:33:16,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:16,416 INFO L225 Difference]: With dead ends: 42 [2022-12-14 15:33:16,417 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 15:33:16,417 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-12-14 15:33:16,418 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 13 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:16,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 102 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:33:16,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 15:33:16,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-12-14 15:33:16,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 15 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-12-14 15:33:16,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 52 transitions. [2022-12-14 15:33:16,425 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 52 transitions. Word has length 19 [2022-12-14 15:33:16,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:16,425 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 52 transitions. [2022-12-14 15:33:16,425 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, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 15:33:16,425 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 52 transitions. [2022-12-14 15:33:16,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:33:16,426 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:16,426 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:16,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 15:33:16,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:16,628 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:16,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:16,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1875029365, now seen corresponding path program 1 times [2022-12-14 15:33:16,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:16,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437035834] [2022-12-14 15:33:16,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:16,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:16,666 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:16,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870386006] [2022-12-14 15:33:16,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:16,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:16,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:16,671 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:16,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:33:16,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:16,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 15:33:16,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:16,950 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:33:16,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:17,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:17,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437035834] [2022-12-14 15:33:17,044 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:17,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870386006] [2022-12-14 15:33:17,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870386006] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:17,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677652575] [2022-12-14 15:33:17,058 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 15:33:17,058 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:17,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:17,064 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:17,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:17,451 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 15:33:17,460 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:17,502 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:18,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [677652575] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:18,452 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 15:33:18,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [10] total 20 [2022-12-14 15:33:18,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270698604] [2022-12-14 15:33:18,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:18,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 15:33:18,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:18,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 15:33:18,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:33:18,454 INFO L87 Difference]: Start difference. First operand 39 states and 52 transitions. Second operand has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 15:33:18,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:18,611 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-12-14 15:33:18,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 15:33:18,611 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2022-12-14 15:33:18,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:18,612 INFO L225 Difference]: With dead ends: 46 [2022-12-14 15:33:18,612 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 15:33:18,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:33:18,613 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:18,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 82 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:33:18,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 15:33:18,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-12-14 15:33:18,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-12-14 15:33:18,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2022-12-14 15:33:18,620 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 24 [2022-12-14 15:33:18,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:18,620 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2022-12-14 15:33:18,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 15:33:18,620 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2022-12-14 15:33:18,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 15:33:18,621 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:18,621 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:18,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 15:33:18,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:18,822 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:18,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:18,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1385830456, now seen corresponding path program 1 times [2022-12-14 15:33:18,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:18,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45783222] [2022-12-14 15:33:18,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:18,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:18,849 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:18,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [808930347] [2022-12-14 15:33:18,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:18,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:18,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:18,850 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:18,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 15:33:18,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:18,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 15:33:18,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:18,898 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:33:18,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:33:18,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:18,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45783222] [2022-12-14 15:33:18,899 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:18,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808930347] [2022-12-14 15:33:18,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808930347] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:18,899 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:33:18,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 15:33:18,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214778161] [2022-12-14 15:33:18,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:18,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 15:33:18,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:18,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 15:33:18,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 15:33:18,901 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-12-14 15:33:18,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:18,935 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2022-12-14 15:33:18,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 15:33:18,935 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 30 [2022-12-14 15:33:18,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:18,936 INFO L225 Difference]: With dead ends: 52 [2022-12-14 15:33:18,936 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 15:33:18,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 15:33:18,937 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 5 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:18,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 100 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:33:18,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 15:33:18,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2022-12-14 15:33:18,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 25 states have (on average 1.16) internal successors, (29), 28 states have internal predecessors, (29), 15 states have call successors, (15), 6 states have call predecessors, (15), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-12-14 15:33:18,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2022-12-14 15:33:18,948 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 30 [2022-12-14 15:33:18,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:18,948 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2022-12-14 15:33:18,949 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-12-14 15:33:18,949 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2022-12-14 15:33:18,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:33:18,949 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:18,950 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:18,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 15:33:19,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 15:33:19,152 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:19,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:19,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1128008437, now seen corresponding path program 1 times [2022-12-14 15:33:19,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:19,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211357699] [2022-12-14 15:33:19,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:19,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:19,189 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:19,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2093265079] [2022-12-14 15:33:19,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:19,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:19,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:19,192 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:19,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 15:33:19,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:19,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 15:33:19,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:19,266 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:33:19,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:19,298 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:33:19,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:19,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211357699] [2022-12-14 15:33:19,299 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:19,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093265079] [2022-12-14 15:33:19,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093265079] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:19,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495152569] [2022-12-14 15:33:19,301 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 15:33:19,301 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:19,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:19,302 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:19,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:20,897 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2022-12-14 15:33:20,933 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:20,951 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:22,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1260#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:22,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:22,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:33:22,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-12-14 15:33:22,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111434479] [2022-12-14 15:33:22,101 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:22,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 15:33:22,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:22,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 15:33:22,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:33:22,103 INFO L87 Difference]: Start difference. First operand 47 states and 57 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-12-14 15:33:22,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:22,201 INFO L93 Difference]: Finished difference Result 109 states and 132 transitions. [2022-12-14 15:33:22,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 15:33:22,202 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 32 [2022-12-14 15:33:22,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:22,204 INFO L225 Difference]: With dead ends: 109 [2022-12-14 15:33:22,204 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 15:33:22,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2022-12-14 15:33:22,205 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 51 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:22,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 167 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:33:22,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 15:33:22,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 91. [2022-12-14 15:33:22,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 50 states have (on average 1.16) internal successors, (58), 54 states have internal predecessors, (58), 29 states have call successors, (29), 12 states have call predecessors, (29), 11 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-12-14 15:33:22,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2022-12-14 15:33:22,222 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 32 [2022-12-14 15:33:22,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:22,222 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2022-12-14 15:33:22,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-12-14 15:33:22,223 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2022-12-14 15:33:22,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:33:22,223 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:22,223 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:22,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 15:33:22,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:22,425 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:22,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:22,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1126340141, now seen corresponding path program 1 times [2022-12-14 15:33:22,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:22,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167318176] [2022-12-14 15:33:22,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:22,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:22,459 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:22,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [789175760] [2022-12-14 15:33:22,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:22,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:22,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:22,463 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:22,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 15:33:22,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:22,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:33:22,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:22,621 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:33:22,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:22,725 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 15:33:22,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:22,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167318176] [2022-12-14 15:33:22,726 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:22,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789175760] [2022-12-14 15:33:22,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789175760] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:22,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 15:33:22,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 10 [2022-12-14 15:33:22,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137378662] [2022-12-14 15:33:22,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:22,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 15:33:22,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:22,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 15:33:22,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-12-14 15:33:22,728 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-12-14 15:33:22,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:22,781 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2022-12-14 15:33:22,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 15:33:22,781 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-12-14 15:33:22,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:22,783 INFO L225 Difference]: With dead ends: 105 [2022-12-14 15:33:22,783 INFO L226 Difference]: Without dead ends: 103 [2022-12-14 15:33:22,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-12-14 15:33:22,784 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 8 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:22,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 63 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:33:22,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-12-14 15:33:22,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-12-14 15:33:22,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 63 states have internal predecessors, (67), 29 states have call successors, (29), 15 states have call predecessors, (29), 14 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-12-14 15:33:22,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 121 transitions. [2022-12-14 15:33:22,797 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 121 transitions. Word has length 32 [2022-12-14 15:33:22,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:22,798 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 121 transitions. [2022-12-14 15:33:22,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-12-14 15:33:22,798 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 121 transitions. [2022-12-14 15:33:22,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:33:22,799 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:22,799 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:22,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 15:33:23,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:23,001 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:23,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:23,002 INFO L85 PathProgramCache]: Analyzing trace with hash -2087905654, now seen corresponding path program 1 times [2022-12-14 15:33:23,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:23,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168977824] [2022-12-14 15:33:23,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:23,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:23,024 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:23,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1173561329] [2022-12-14 15:33:23,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:23,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:23,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:23,028 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:23,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 15:33:23,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:23,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:33:23,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:23,240 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:33:23,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:23,335 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:33:23,336 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:23,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168977824] [2022-12-14 15:33:23,336 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:23,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173561329] [2022-12-14 15:33:23,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173561329] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:23,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1396659302] [2022-12-14 15:33:23,338 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-12-14 15:33:23,338 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:23,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:23,339 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:23,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:23,635 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 15:33:23,642 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:23,657 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:24,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1396659302] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:33:24,797 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:33:24,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [9, 8] total 23 [2022-12-14 15:33:24,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481670674] [2022-12-14 15:33:24,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:33:24,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:33:24,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:24,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:33:24,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:33:24,798 INFO L87 Difference]: Start difference. First operand 103 states and 121 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 15:33:25,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:25,029 INFO L93 Difference]: Finished difference Result 105 states and 122 transitions. [2022-12-14 15:33:25,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 15:33:25,029 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 35 [2022-12-14 15:33:25,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:25,030 INFO L225 Difference]: With dead ends: 105 [2022-12-14 15:33:25,030 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 15:33:25,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:33:25,031 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:25,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 116 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:33:25,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 15:33:25,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-12-14 15:33:25,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 58 states have internal predecessors, (61), 27 states have call successors, (27), 13 states have call predecessors, (27), 13 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-12-14 15:33:25,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2022-12-14 15:33:25,049 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 35 [2022-12-14 15:33:25,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:25,049 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2022-12-14 15:33:25,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 15:33:25,049 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2022-12-14 15:33:25,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:33:25,050 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:25,050 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:25,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 15:33:25,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 15:33:25,252 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:25,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:25,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1860492319, now seen corresponding path program 2 times [2022-12-14 15:33:25,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:25,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826856547] [2022-12-14 15:33:25,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:25,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:25,274 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:25,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [689391975] [2022-12-14 15:33:25,275 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:33:25,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:25,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:25,278 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:25,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 15:33:25,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:33:25,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:25,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:33:25,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:25,566 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 15:33:25,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:25,841 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 15:33:25,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:25,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826856547] [2022-12-14 15:33:25,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:25,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689391975] [2022-12-14 15:33:25,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689391975] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:25,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118073575] [2022-12-14 15:33:25,843 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 15:33:25,843 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:25,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:25,843 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:25,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:27,219 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:33:27,223 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:27,238 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:28,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2832#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:28,743 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:28,743 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:33:28,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2022-12-14 15:33:28,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5501273] [2022-12-14 15:33:28,743 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:28,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:33:28,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:28,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:33:28,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=658, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:33:28,745 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 15:33:31,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:31,308 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2022-12-14 15:33:31,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 15:33:31,309 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) Word has length 37 [2022-12-14 15:33:31,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:31,310 INFO L225 Difference]: With dead ends: 108 [2022-12-14 15:33:31,310 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 15:33:31,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:33:31,310 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 32 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:31,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 175 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:33:31,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 15:33:31,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2022-12-14 15:33:31,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 64 states have internal predecessors, (67), 27 states have call successors, (27), 15 states have call predecessors, (27), 15 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-12-14 15:33:31,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2022-12-14 15:33:31,331 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 37 [2022-12-14 15:33:31,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:31,331 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2022-12-14 15:33:31,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 15:33:31,332 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2022-12-14 15:33:31,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 15:33:31,332 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:31,333 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:31,338 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 15:33:31,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 15:33:31,535 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:31,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:31,536 INFO L85 PathProgramCache]: Analyzing trace with hash -209579757, now seen corresponding path program 3 times [2022-12-14 15:33:31,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:31,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417931422] [2022-12-14 15:33:31,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:31,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:31,557 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:31,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [522518511] [2022-12-14 15:33:31,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:33:31,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:31,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:31,561 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:31,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 15:33:31,621 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:33:31,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:31,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 39 conjunts are in the unsatisfiable core [2022-12-14 15:33:31,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:31,937 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-12-14 15:33:31,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:32,402 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-12-14 15:33:32,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:32,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417931422] [2022-12-14 15:33:32,403 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:32,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522518511] [2022-12-14 15:33:32,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522518511] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:32,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [186464615] [2022-12-14 15:33:32,405 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 15:33:32,405 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:32,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:32,405 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:32,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:33,790 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:33:33,794 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:33,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:35,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3428#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:35,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:35,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:33:35,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2022-12-14 15:33:35,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799649521] [2022-12-14 15:33:35,297 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:35,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 15:33:35,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:35,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 15:33:35,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=870, Unknown=0, NotChecked=0, Total=992 [2022-12-14 15:33:35,298 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 7 states have call predecessors, (14), 8 states have call successors, (14) [2022-12-14 15:33:36,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:36,213 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2022-12-14 15:33:36,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 15:33:36,213 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 7 states have call predecessors, (14), 8 states have call successors, (14) Word has length 42 [2022-12-14 15:33:36,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:36,214 INFO L225 Difference]: With dead ends: 120 [2022-12-14 15:33:36,214 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 15:33:36,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=176, Invalid=1230, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 15:33:36,216 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:36,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 92 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:33:36,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 15:33:36,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 97. [2022-12-14 15:33:36,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 64 states have internal predecessors, (67), 19 states have call successors, (19), 16 states have call predecessors, (19), 15 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-12-14 15:33:36,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2022-12-14 15:33:36,227 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 42 [2022-12-14 15:33:36,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:36,227 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2022-12-14 15:33:36,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 7 states have call predecessors, (14), 8 states have call successors, (14) [2022-12-14 15:33:36,227 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2022-12-14 15:33:36,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 15:33:36,228 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:36,228 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] [2022-12-14 15:33:36,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 15:33:36,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:36,430 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:36,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:36,431 INFO L85 PathProgramCache]: Analyzing trace with hash 484799234, now seen corresponding path program 1 times [2022-12-14 15:33:36,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:36,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565178172] [2022-12-14 15:33:36,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:36,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:36,438 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:36,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1307215054] [2022-12-14 15:33:36,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:36,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:36,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:36,439 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:36,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 15:33:36,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:36,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:33:36,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:36,541 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 15:33:36,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:36,627 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 15:33:36,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:36,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565178172] [2022-12-14 15:33:36,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:36,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307215054] [2022-12-14 15:33:36,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307215054] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:36,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209846241] [2022-12-14 15:33:36,629 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-12-14 15:33:36,630 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:36,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:36,630 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:36,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:38,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:33:38,345 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:38,365 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:49,901 WARN L233 SmtUtils]: Spent 9.65s on a formula simplification. DAG size of input: 61 DAG size of output: 54 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 15:33:50,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4092#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:50,117 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:50,117 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:33:50,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2022-12-14 15:33:50,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138259646] [2022-12-14 15:33:50,117 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:50,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 15:33:50,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:50,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 15:33:50,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:33:50,118 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2022-12-14 15:33:50,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:50,262 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2022-12-14 15:33:50,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:33:50,262 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) Word has length 53 [2022-12-14 15:33:50,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:50,263 INFO L225 Difference]: With dead ends: 104 [2022-12-14 15:33:50,263 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 15:33:50,264 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=127, Invalid=743, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:33:50,264 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 14 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:50,265 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 76 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:33:50,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 15:33:50,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-12-14 15:33:50,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 54 states have (on average 1.037037037037037) internal successors, (56), 55 states have internal predecessors, (56), 16 states have call successors, (16), 13 states have call predecessors, (16), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-12-14 15:33:50,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2022-12-14 15:33:50,273 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 53 [2022-12-14 15:33:50,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:50,274 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2022-12-14 15:33:50,274 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2022-12-14 15:33:50,274 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2022-12-14 15:33:50,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-12-14 15:33:50,274 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:50,274 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:50,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 15:33:50,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:50,476 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:50,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:50,477 INFO L85 PathProgramCache]: Analyzing trace with hash 1893559055, now seen corresponding path program 4 times [2022-12-14 15:33:50,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:50,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102563229] [2022-12-14 15:33:50,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:50,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:50,500 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:50,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1820562364] [2022-12-14 15:33:50,501 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:33:50,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:50,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:50,504 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:50,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 15:33:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:50,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 15:33:50,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:52,548 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 66 proven. 48 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2022-12-14 15:33:52,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:52,896 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2022-12-14 15:33:52,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:52,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102563229] [2022-12-14 15:33:52,897 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:52,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820562364] [2022-12-14 15:33:52,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820562364] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:52,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1374738115] [2022-12-14 15:33:52,898 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 15:33:52,898 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:52,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:52,899 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:52,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:54,208 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:33:54,211 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:33:54,225 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:56,131 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4825#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:56,131 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:56,131 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:33:56,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2022-12-14 15:33:56,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570743042] [2022-12-14 15:33:56,132 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:56,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 15:33:56,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:56,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 15:33:56,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2022-12-14 15:33:56,133 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) [2022-12-14 15:33:58,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:58,387 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2022-12-14 15:33:58,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 15:33:58,388 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) Word has length 73 [2022-12-14 15:33:58,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:58,388 INFO L225 Difference]: With dead ends: 94 [2022-12-14 15:33:58,388 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 15:33:58,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 186 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=168, Invalid=1164, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 15:33:58,389 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 24 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:58,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 110 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 15:33:58,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 15:33:58,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2022-12-14 15:33:58,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 16 states have call successors, (16), 14 states have call predecessors, (16), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-12-14 15:33:58,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2022-12-14 15:33:58,402 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 73 [2022-12-14 15:33:58,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:58,402 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2022-12-14 15:33:58,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) [2022-12-14 15:33:58,402 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2022-12-14 15:33:58,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 15:33:58,403 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:58,403 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:58,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 15:33:58,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 15:33:58,605 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:58,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:58,606 INFO L85 PathProgramCache]: Analyzing trace with hash -510598493, now seen corresponding path program 2 times [2022-12-14 15:33:58,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:58,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910654465] [2022-12-14 15:33:58,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:58,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:58,629 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:33:58,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1576967342] [2022-12-14 15:33:58,630 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:33:58,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:58,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:58,634 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:58,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 15:33:58,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 15:33:58,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:58,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 15:33:58,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:59,052 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 15:33:59,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:59,108 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-12-14 15:33:59,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:59,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910654465] [2022-12-14 15:33:59,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:33:59,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576967342] [2022-12-14 15:33:59,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576967342] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:59,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [30003784] [2022-12-14 15:33:59,110 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 15:33:59,110 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:59,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:59,111 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:59,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:00,581 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:34:00,584 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:34:00,603 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:02,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5631#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:02,042 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:02,042 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:34:02,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-12-14 15:34:02,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776007098] [2022-12-14 15:34:02,043 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:02,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 15:34:02,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:02,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 15:34:02,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=688, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:34:02,045 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) [2022-12-14 15:34:02,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:34:02,276 INFO L93 Difference]: Finished difference Result 204 states and 212 transitions. [2022-12-14 15:34:02,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:34:02,276 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) Word has length 86 [2022-12-14 15:34:02,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:34:02,277 INFO L225 Difference]: With dead ends: 204 [2022-12-14 15:34:02,277 INFO L226 Difference]: Without dead ends: 196 [2022-12-14 15:34:02,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=295, Invalid=1187, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:34:02,278 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 56 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:34:02,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 144 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:34:02,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-12-14 15:34:02,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2022-12-14 15:34:02,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 130 states have internal predecessors, (131), 34 states have call successors, (34), 32 states have call predecessors, (34), 32 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2022-12-14 15:34:02,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2022-12-14 15:34:02,306 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 86 [2022-12-14 15:34:02,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:34:02,306 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2022-12-14 15:34:02,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) [2022-12-14 15:34:02,306 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2022-12-14 15:34:02,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-12-14 15:34:02,307 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:34:02,307 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 11, 10, 10, 10, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:34:02,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-12-14 15:34:02,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 15:34:02,509 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:34:02,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:34:02,510 INFO L85 PathProgramCache]: Analyzing trace with hash 1184159699, now seen corresponding path program 3 times [2022-12-14 15:34:02,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:34:02,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784531218] [2022-12-14 15:34:02,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:34:02,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:34:02,544 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:34:02,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1730431749] [2022-12-14 15:34:02,544 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:34:02,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:02,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:34:02,546 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:34:02,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 15:34:02,690 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:34:02,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:34:02,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 15:34:02,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:34:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 1910 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-12-14 15:34:02,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:34:03,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 290 refuted. 0 times theorem prover too weak. 1742 trivial. 0 not checked. [2022-12-14 15:34:03,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:34:03,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784531218] [2022-12-14 15:34:03,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:34:03,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730431749] [2022-12-14 15:34:03,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730431749] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:34:03,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1390933921] [2022-12-14 15:34:03,094 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 15:34:03,094 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:34:03,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:34:03,094 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:34:03,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:04,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:34:04,451 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:34:04,470 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:06,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7406#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:06,062 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:06,062 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:34:06,062 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-12-14 15:34:06,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714013402] [2022-12-14 15:34:06,063 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:06,063 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 15:34:06,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:06,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 15:34:06,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=1270, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 15:34:06,066 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) [2022-12-14 15:34:06,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:34:06,705 INFO L93 Difference]: Finished difference Result 420 states and 434 transitions. [2022-12-14 15:34:06,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 15:34:06,706 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) Word has length 194 [2022-12-14 15:34:06,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:34:06,707 INFO L225 Difference]: With dead ends: 420 [2022-12-14 15:34:06,707 INFO L226 Difference]: Without dead ends: 412 [2022-12-14 15:34:06,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1211 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=967, Invalid=2939, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 15:34:06,708 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 116 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:34:06,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 343 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:34:06,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-12-14 15:34:06,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 412. [2022-12-14 15:34:06,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 273 states have (on average 1.0073260073260073) internal successors, (275), 274 states have internal predecessors, (275), 70 states have call successors, (70), 68 states have call predecessors, (70), 68 states have return successors, (69), 69 states have call predecessors, (69), 69 states have call successors, (69) [2022-12-14 15:34:06,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 414 transitions. [2022-12-14 15:34:06,766 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 414 transitions. Word has length 194 [2022-12-14 15:34:06,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:34:06,767 INFO L495 AbstractCegarLoop]: Abstraction has 412 states and 414 transitions. [2022-12-14 15:34:06,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) [2022-12-14 15:34:06,767 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 414 transitions. [2022-12-14 15:34:06,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 411 [2022-12-14 15:34:06,771 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:34:06,771 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 23, 22, 22, 22, 22, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:34:06,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 15:34:06,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:06,973 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:34:06,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:34:06,974 INFO L85 PathProgramCache]: Analyzing trace with hash 115288627, now seen corresponding path program 4 times [2022-12-14 15:34:06,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:34:06,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082268020] [2022-12-14 15:34:06,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:34:06,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:34:07,010 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:34:07,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [757712506] [2022-12-14 15:34:07,010 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:34:07,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:07,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:34:07,011 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:34:07,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 15:34:07,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:34:07,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 15:34:07,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:34:07,569 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 9746 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-12-14 15:34:07,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:34:08,240 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 1430 refuted. 0 times theorem prover too weak. 8582 trivial. 0 not checked. [2022-12-14 15:34:08,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:34:08,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082268020] [2022-12-14 15:34:08,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 15:34:08,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757712506] [2022-12-14 15:34:08,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757712506] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:34:08,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533333209] [2022-12-14 15:34:08,243 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 15:34:08,243 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:34:08,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:34:08,243 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:34:08,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:09,570 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 15:34:09,573 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 15:34:09,589 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:11,027 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11125#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:11,027 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:11,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 15:34:11,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-12-14 15:34:11,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116736361] [2022-12-14 15:34:11,028 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:11,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 15:34:11,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:11,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 15:34:11,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1424, Invalid=2866, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 15:34:11,030 INFO L87 Difference]: Start difference. First operand 412 states and 414 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) [2022-12-14 15:34:12,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:34:12,592 INFO L93 Difference]: Finished difference Result 852 states and 878 transitions. [2022-12-14 15:34:12,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-12-14 15:34:12,593 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) Word has length 410 [2022-12-14 15:34:12,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:34:12,595 INFO L225 Difference]: With dead ends: 852 [2022-12-14 15:34:12,595 INFO L226 Difference]: Without dead ends: 844 [2022-12-14 15:34:12,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1164 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3161 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3607, Invalid=8603, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 15:34:12,597 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 329 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 908 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 1095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:34:12,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [329 Valid, 622 Invalid, 1095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 908 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:34:12,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 844 states. [2022-12-14 15:34:12,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 844 to 844. [2022-12-14 15:34:12,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 844 states, 561 states have (on average 1.0035650623885919) internal successors, (563), 562 states have internal predecessors, (563), 142 states have call successors, (142), 140 states have call predecessors, (142), 140 states have return successors, (141), 141 states have call predecessors, (141), 141 states have call successors, (141) [2022-12-14 15:34:12,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 844 states to 844 states and 846 transitions. [2022-12-14 15:34:12,720 INFO L78 Accepts]: Start accepts. Automaton has 844 states and 846 transitions. Word has length 410 [2022-12-14 15:34:12,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:34:12,720 INFO L495 AbstractCegarLoop]: Abstraction has 844 states and 846 transitions. [2022-12-14 15:34:12,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) [2022-12-14 15:34:12,721 INFO L276 IsEmpty]: Start isEmpty. Operand 844 states and 846 transitions. [2022-12-14 15:34:12,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 843 [2022-12-14 15:34:12,738 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:34:12,738 INFO L195 NwaCegarLoop]: trace histogram [139, 138, 138, 47, 46, 46, 46, 46, 46, 46, 46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:34:12,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 15:34:12,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 15:34:12,940 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:34:12,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:34:12,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1269993741, now seen corresponding path program 5 times [2022-12-14 15:34:12,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:34:12,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25200337] [2022-12-14 15:34:12,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:34:12,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:34:13,001 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 15:34:13,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1233275485] [2022-12-14 15:34:13,002 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:34:13,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:13,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:34:13,003 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:34:13,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c8f66c15-a8c1-433f-baa0-20a91bde219a/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process