./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/hard-ll.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_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/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_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/hard-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/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_7225f968-21a0-40af-bc93-4a7ae418ba54/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 8c31bebbbf1ab8c6e57b91fec88eba145fb9c1b52fce25f48cae26620a3d8ba6 --- 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 07:26:21,677 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 07:26:21,679 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 07:26:21,691 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 07:26:21,692 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 07:26:21,692 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 07:26:21,693 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 07:26:21,694 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 07:26:21,695 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 07:26:21,696 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 07:26:21,696 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 07:26:21,697 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 07:26:21,697 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 07:26:21,698 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 07:26:21,699 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 07:26:21,699 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 07:26:21,700 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 07:26:21,701 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 07:26:21,702 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 07:26:21,703 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 07:26:21,704 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 07:26:21,705 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 07:26:21,706 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 07:26:21,707 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 07:26:21,710 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 07:26:21,711 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 07:26:21,711 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 07:26:21,712 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 07:26:21,712 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 07:26:21,713 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 07:26:21,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 07:26:21,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 07:26:21,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 07:26:21,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 07:26:21,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 07:26:21,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 07:26:21,717 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 07:26:21,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 07:26:21,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 07:26:21,719 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 07:26:21,719 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 07:26:21,720 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 07:26:21,742 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 07:26:21,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 07:26:21,742 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 07:26:21,747 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 07:26:21,748 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 07:26:21,748 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 07:26:21,748 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 07:26:21,748 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 07:26:21,748 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 07:26:21,748 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 07:26:21,748 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 07:26:21,749 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 07:26:21,749 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 07:26:21,749 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 07:26:21,749 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 07:26:21,749 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 07:26:21,749 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 07:26:21,749 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 07:26:21,750 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 07:26:21,750 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 07:26:21,750 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 07:26:21,750 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 07:26:21,750 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 07:26:21,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 07:26:21,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 07:26:21,751 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 07:26:21,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 07:26:21,752 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 07:26:21,753 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_7225f968-21a0-40af-bc93-4a7ae418ba54/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8c31bebbbf1ab8c6e57b91fec88eba145fb9c1b52fce25f48cae26620a3d8ba6 [2022-12-14 07:26:21,938 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 07:26:21,958 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 07:26:21,961 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 07:26:21,962 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 07:26:21,962 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 07:26:21,963 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench/hard-ll.c [2022-12-14 07:26:24,526 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 07:26:24,684 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 07:26:24,685 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/sv-benchmarks/c/nla-digbench/hard-ll.c [2022-12-14 07:26:24,690 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/data/f8238975a/1ee68ec8e30748e49de3ab16d7ac4b51/FLAG450e9ba75 [2022-12-14 07:26:25,105 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/data/f8238975a/1ee68ec8e30748e49de3ab16d7ac4b51 [2022-12-14 07:26:25,107 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 07:26:25,108 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 07:26:25,109 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 07:26:25,109 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 07:26:25,112 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 07:26:25,113 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,113 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b0f7f52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25, skipping insertion in model container [2022-12-14 07:26:25,113 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,119 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 07:26:25,129 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 07:26:25,229 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_7225f968-21a0-40af-bc93-4a7ae418ba54/sv-benchmarks/c/nla-digbench/hard-ll.c[538,551] [2022-12-14 07:26:25,240 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 07:26:25,247 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 07:26:25,256 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_7225f968-21a0-40af-bc93-4a7ae418ba54/sv-benchmarks/c/nla-digbench/hard-ll.c[538,551] [2022-12-14 07:26:25,260 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 07:26:25,270 INFO L208 MainTranslator]: Completed translation [2022-12-14 07:26:25,270 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25 WrapperNode [2022-12-14 07:26:25,270 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 07:26:25,271 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 07:26:25,271 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 07:26:25,271 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 07:26:25,277 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,281 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,293 INFO L138 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 56 [2022-12-14 07:26:25,294 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 07:26:25,294 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 07:26:25,294 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 07:26:25,294 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 07:26:25,301 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,301 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,302 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,302 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,304 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,307 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,307 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,308 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 07:26:25,310 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 07:26:25,310 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 07:26:25,310 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 07:26:25,310 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (1/1) ... [2022-12-14 07:26:25,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 07:26:25,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:25,335 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 07:26:25,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 07:26:25,369 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 07:26:25,370 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 07:26:25,370 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 07:26:25,370 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 07:26:25,370 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 07:26:25,370 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 07:26:25,432 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 07:26:25,434 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 07:26:25,549 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 07:26:25,578 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 07:26:25,579 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 07:26:25,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 07:26:25 BoogieIcfgContainer [2022-12-14 07:26:25,581 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 07:26:25,583 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 07:26:25,583 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 07:26:25,587 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 07:26:25,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 07:26:25" (1/3) ... [2022-12-14 07:26:25,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28ca037d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 07:26:25, skipping insertion in model container [2022-12-14 07:26:25,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:26:25" (2/3) ... [2022-12-14 07:26:25,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28ca037d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 07:26:25, skipping insertion in model container [2022-12-14 07:26:25,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 07:26:25" (3/3) ... [2022-12-14 07:26:25,590 INFO L112 eAbstractionObserver]: Analyzing ICFG hard-ll.c [2022-12-14 07:26:25,609 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 07:26:25,609 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 07:26:25,650 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 07:26:25,656 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;@337b9083, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 07:26:25,656 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 07:26:25,659 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-12-14 07:26:25,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 07:26:25,666 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:25,667 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 07:26:25,667 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:25,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:25,672 INFO L85 PathProgramCache]: Analyzing trace with hash -697525204, now seen corresponding path program 1 times [2022-12-14 07:26:25,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:25,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060052281] [2022-12-14 07:26:25,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:25,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:25,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:25,884 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:26:25,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:25,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060052281] [2022-12-14 07:26:25,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060052281] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:26:25,886 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:26:25,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 07:26:25,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58903880] [2022-12-14 07:26:25,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:26:25,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:26:25,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:25,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:26:25,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:26:25,913 INFO L87 Difference]: Start difference. First operand has 20 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 07:26:25,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:25,999 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2022-12-14 07:26:26,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 07:26:26,001 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 07:26:26,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:26,008 INFO L225 Difference]: With dead ends: 51 [2022-12-14 07:26:26,008 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 07:26:26,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 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 07:26:26,013 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 11 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:26,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 77 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:26:26,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 07:26:26,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2022-12-14 07:26:26,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 07:26:26,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2022-12-14 07:26:26,044 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 6 [2022-12-14 07:26:26,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:26,044 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2022-12-14 07:26:26,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 07:26:26,045 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2022-12-14 07:26:26,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 07:26:26,046 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:26,046 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:26,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 07:26:26,046 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:26,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:26,047 INFO L85 PathProgramCache]: Analyzing trace with hash -515229903, now seen corresponding path program 1 times [2022-12-14 07:26:26,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:26,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177919106] [2022-12-14 07:26:26,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:26,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:26,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:26,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:26:26,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:26,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177919106] [2022-12-14 07:26:26,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177919106] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:26:26,143 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:26:26,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 07:26:26,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940496551] [2022-12-14 07:26:26,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:26:26,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:26:26,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:26,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:26:26,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:26:26,145 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 07:26:26,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:26,209 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-12-14 07:26:26,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 07:26:26,210 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-12-14 07:26:26,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:26,211 INFO L225 Difference]: With dead ends: 34 [2022-12-14 07:26:26,211 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 07:26:26,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 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 07:26:26,213 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 8 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:26,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 70 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:26:26,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 07:26:26,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2022-12-14 07:26:26,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 07:26:26,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2022-12-14 07:26:26,223 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 11 [2022-12-14 07:26:26,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:26,224 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2022-12-14 07:26:26,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 07:26:26,224 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2022-12-14 07:26:26,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 07:26:26,224 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:26,225 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:26,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 07:26:26,225 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:26,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:26,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1604661492, now seen corresponding path program 1 times [2022-12-14 07:26:26,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:26,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670093357] [2022-12-14 07:26:26,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:26,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:26,239 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:26,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1860296503] [2022-12-14 07:26:26,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:26,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:26,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:26,241 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:26,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 07:26:26,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:26,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2022-12-14 07:26:26,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:26,410 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 07:26:26,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:26,515 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 07:26:26,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:26,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670093357] [2022-12-14 07:26:26,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:26,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860296503] [2022-12-14 07:26:26,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860296503] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:26,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533849875] [2022-12-14 07:26:26,531 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 07:26:26,531 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:26,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:26,537 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:26,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:26,729 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-12-14 07:26:26,737 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:26,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1533849875] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:26:26,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:26:26,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8, 7] total 15 [2022-12-14 07:26:26,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762929798] [2022-12-14 07:26:26,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:26:26,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:26:26,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:26,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:26:26,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2022-12-14 07:26:26,981 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 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 07:26:27,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:27,102 INFO L93 Difference]: Finished difference Result 61 states and 75 transitions. [2022-12-14 07:26:27,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:26:27,102 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 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 16 [2022-12-14 07:26:27,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:27,103 INFO L225 Difference]: With dead ends: 61 [2022-12-14 07:26:27,103 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 07:26:27,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2022-12-14 07:26:27,104 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 3 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:27,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 51 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:26:27,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 07:26:27,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-12-14 07:26:27,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 27 states have internal predecessors, (29), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 07:26:27,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2022-12-14 07:26:27,113 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 16 [2022-12-14 07:26:27,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:27,113 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2022-12-14 07:26:27,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 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 07:26:27,114 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2022-12-14 07:26:27,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 07:26:27,114 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:27,114 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 07:26:27,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 07:26:27,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:27,315 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:27,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:27,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1042343919, now seen corresponding path program 1 times [2022-12-14 07:26:27,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:27,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254289905] [2022-12-14 07:26:27,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:27,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:27,323 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:27,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2049586425] [2022-12-14 07:26:27,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:27,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:27,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:27,325 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:27,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 07:26:27,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:27,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 07:26:27,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:27,529 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 9 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 07:26:27,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:27,648 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 11 proven. 13 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 07:26:27,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:27,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254289905] [2022-12-14 07:26:27,648 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:27,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049586425] [2022-12-14 07:26:27,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049586425] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:27,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [694808108] [2022-12-14 07:26:27,651 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 07:26:27,651 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:27,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:27,652 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:27,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:28,836 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:26:28,844 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:29,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '702#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:29,336 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:29,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:26:29,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2022-12-14 07:26:29,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050027201] [2022-12-14 07:26:29,336 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:29,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 07:26:29,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:29,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 07:26:29,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-12-14 07:26:29,338 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) [2022-12-14 07:26:29,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:29,540 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2022-12-14 07:26:29,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 07:26:29,541 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) Word has length 33 [2022-12-14 07:26:29,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:29,543 INFO L225 Difference]: With dead ends: 77 [2022-12-14 07:26:29,543 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 07:26:29,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2022-12-14 07:26:29,545 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 31 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:29,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 52 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:26:29,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 07:26:29,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-12-14 07:26:29,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 39 states have internal predecessors, (40), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-12-14 07:26:29,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2022-12-14 07:26:29,562 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 33 [2022-12-14 07:26:29,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:29,563 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2022-12-14 07:26:29,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) [2022-12-14 07:26:29,563 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2022-12-14 07:26:29,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 07:26:29,564 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:29,564 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:29,569 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 07:26:29,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:29,765 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:29,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:29,766 INFO L85 PathProgramCache]: Analyzing trace with hash -1798480357, now seen corresponding path program 1 times [2022-12-14 07:26:29,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:29,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251581498] [2022-12-14 07:26:29,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:29,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:29,777 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:29,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [469775105] [2022-12-14 07:26:29,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:29,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:29,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:29,778 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:29,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 07:26:29,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:29,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 19 conjunts are in the unsatisfiable core [2022-12-14 07:26:29,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:30,082 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 07:26:30,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:30,232 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 07:26:30,232 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:30,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251581498] [2022-12-14 07:26:30,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:30,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469775105] [2022-12-14 07:26:30,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469775105] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:30,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3227169] [2022-12-14 07:26:30,233 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:26:30,234 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:30,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:30,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:30,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:31,146 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-12-14 07:26:31,157 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:33,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1176#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:33,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:33,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:26:33,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-12-14 07:26:33,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661635500] [2022-12-14 07:26:33,959 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:33,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 07:26:33,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:33,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 07:26:33,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=335, Unknown=1, NotChecked=0, Total=420 [2022-12-14 07:26:33,960 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 07:26:34,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:34,308 INFO L93 Difference]: Finished difference Result 81 states and 94 transitions. [2022-12-14 07:26:34,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 07:26:34,308 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 40 [2022-12-14 07:26:34,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:34,309 INFO L225 Difference]: With dead ends: 81 [2022-12-14 07:26:34,309 INFO L226 Difference]: Without dead ends: 79 [2022-12-14 07:26:34,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=97, Invalid=408, Unknown=1, NotChecked=0, Total=506 [2022-12-14 07:26:34,310 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 18 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:34,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 121 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:26:34,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-12-14 07:26:34,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2022-12-14 07:26:34,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 48 states have internal predecessors, (49), 20 states have call successors, (20), 10 states have call predecessors, (20), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-12-14 07:26:34,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2022-12-14 07:26:34,321 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 40 [2022-12-14 07:26:34,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:34,321 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2022-12-14 07:26:34,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 07:26:34,321 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2022-12-14 07:26:34,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 07:26:34,322 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:34,322 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:34,326 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 07:26:34,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:34,524 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:34,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:34,525 INFO L85 PathProgramCache]: Analyzing trace with hash -1731990838, now seen corresponding path program 1 times [2022-12-14 07:26:34,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:34,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945226633] [2022-12-14 07:26:34,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:34,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:34,551 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:34,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [717687484] [2022-12-14 07:26:34,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:34,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:34,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:34,555 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:34,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 07:26:34,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:34,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 07:26:34,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:34,974 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-12-14 07:26:34,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:39,391 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-12-14 07:26:39,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:39,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945226633] [2022-12-14 07:26:39,391 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:39,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717687484] [2022-12-14 07:26:39,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717687484] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:39,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151937791] [2022-12-14 07:26:39,394 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:26:39,394 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:39,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:39,394 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:39,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:42,628 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:26:42,636 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:46,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1742#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:46,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:46,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:26:46,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-12-14 07:26:46,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012833737] [2022-12-14 07:26:46,235 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:46,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 07:26:46,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:46,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 07:26:46,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2022-12-14 07:26:46,237 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 12 states have internal predecessors, (24), 8 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-12-14 07:26:52,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:52,182 INFO L93 Difference]: Finished difference Result 108 states and 133 transitions. [2022-12-14 07:26:52,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 07:26:52,183 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 12 states have internal predecessors, (24), 8 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 52 [2022-12-14 07:26:52,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:52,183 INFO L225 Difference]: With dead ends: 108 [2022-12-14 07:26:52,183 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 07:26:52,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=128, Invalid=684, Unknown=0, NotChecked=0, Total=812 [2022-12-14 07:26:52,184 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 28 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:52,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 186 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 07:26:52,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 07:26:52,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 100. [2022-12-14 07:26:52,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 62 states have internal predecessors, (65), 29 states have call successors, (29), 12 states have call predecessors, (29), 12 states have return successors, (27), 25 states have call predecessors, (27), 27 states have call successors, (27) [2022-12-14 07:26:52,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 121 transitions. [2022-12-14 07:26:52,206 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 121 transitions. Word has length 52 [2022-12-14 07:26:52,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:52,206 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 121 transitions. [2022-12-14 07:26:52,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 12 states have internal predecessors, (24), 8 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-12-14 07:26:52,207 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 121 transitions. [2022-12-14 07:26:52,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 07:26:52,208 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:52,208 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:52,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-12-14 07:26:52,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:52,410 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:52,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:52,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1143375622, now seen corresponding path program 1 times [2022-12-14 07:26:52,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:52,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912725000] [2022-12-14 07:26:52,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:52,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:52,421 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:52,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1789392144] [2022-12-14 07:26:52,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:52,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:52,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:52,423 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:52,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 07:26:52,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:52,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 07:26:52,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:52,673 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-12-14 07:26:52,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:52,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:52,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912725000] [2022-12-14 07:26:52,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:52,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789392144] [2022-12-14 07:26:52,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789392144] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:26:52,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715981627] [2022-12-14 07:26:52,961 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 07:26:52,961 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:52,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:52,962 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:52,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:54,950 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:26:54,955 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:55,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2333#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:55,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:55,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-12-14 07:26:55,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-12-14 07:26:55,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464455523] [2022-12-14 07:26:55,580 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:55,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 07:26:55,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:55,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 07:26:55,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-12-14 07:26:55,581 INFO L87 Difference]: Start difference. First operand 100 states and 121 transitions. Second operand has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-12-14 07:26:55,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:55,774 INFO L93 Difference]: Finished difference Result 115 states and 141 transitions. [2022-12-14 07:26:55,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 07:26:55,774 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 63 [2022-12-14 07:26:55,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:55,775 INFO L225 Difference]: With dead ends: 115 [2022-12-14 07:26:55,775 INFO L226 Difference]: Without dead ends: 104 [2022-12-14 07:26:55,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 116 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2022-12-14 07:26:55,776 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 8 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:55,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 101 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:26:55,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-12-14 07:26:55,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2022-12-14 07:26:55,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 60 states have (on average 1.1333333333333333) internal successors, (68), 63 states have internal predecessors, (68), 27 states have call successors, (27), 13 states have call predecessors, (27), 13 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2022-12-14 07:26:55,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 121 transitions. [2022-12-14 07:26:55,800 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 121 transitions. Word has length 63 [2022-12-14 07:26:55,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:55,800 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 121 transitions. [2022-12-14 07:26:55,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-12-14 07:26:55,800 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 121 transitions. [2022-12-14 07:26:55,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-12-14 07:26:55,801 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:55,801 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:55,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-14 07:26:56,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 07:26:56,003 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:56,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:56,004 INFO L85 PathProgramCache]: Analyzing trace with hash 2113244439, now seen corresponding path program 1 times [2022-12-14 07:26:56,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:56,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155178832] [2022-12-14 07:26:56,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:56,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:56,026 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:56,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [290759590] [2022-12-14 07:26:56,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:56,027 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:56,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:56,030 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:56,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 07:26:56,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:56,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 07:26:56,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:56,111 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2022-12-14 07:26:56,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 07:26:56,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:56,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155178832] [2022-12-14 07:26:56,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:56,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290759590] [2022-12-14 07:26:56,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290759590] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:26:56,112 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:26:56,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 07:26:56,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16444968] [2022-12-14 07:26:56,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:26:56,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 07:26:56,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:56,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 07:26:56,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:26:56,113 INFO L87 Difference]: Start difference. First operand 101 states and 121 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 07:26:56,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:56,202 INFO L93 Difference]: Finished difference Result 108 states and 127 transitions. [2022-12-14 07:26:56,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:26:56,203 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2022-12-14 07:26:56,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:56,204 INFO L225 Difference]: With dead ends: 108 [2022-12-14 07:26:56,204 INFO L226 Difference]: Without dead ends: 96 [2022-12-14 07:26:56,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-12-14 07:26:56,205 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 3 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:56,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 86 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:26:56,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-12-14 07:26:56,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2022-12-14 07:26:56,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 57 states have (on average 1.087719298245614) internal successors, (62), 59 states have internal predecessors, (62), 26 states have call successors, (26), 12 states have call predecessors, (26), 12 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-12-14 07:26:56,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 113 transitions. [2022-12-14 07:26:56,235 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 113 transitions. Word has length 73 [2022-12-14 07:26:56,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:56,236 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 113 transitions. [2022-12-14 07:26:56,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 07:26:56,236 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 113 transitions. [2022-12-14 07:26:56,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 07:26:56,237 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:56,237 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:56,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 07:26:56,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 07:26:56,439 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:56,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:56,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1241228560, now seen corresponding path program 2 times [2022-12-14 07:26:56,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:56,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815278157] [2022-12-14 07:26:56,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:56,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:56,467 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:26:56,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2015676522] [2022-12-14 07:26:56,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:26:56,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:56,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:56,471 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:56,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 07:26:56,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 07:26:56,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:26:56,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 07:26:56,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:56,762 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-12-14 07:26:56,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:57,407 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 24 proven. 13 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2022-12-14 07:26:57,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:57,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815278157] [2022-12-14 07:26:57,408 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:26:57,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015676522] [2022-12-14 07:26:57,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015676522] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:57,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205023596] [2022-12-14 07:26:57,410 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:26:57,410 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:57,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:57,410 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:57,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:27:02,560 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-12-14 07:27:02,570 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:27:03,207 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3649#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:27:03,207 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:27:03,207 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:27:03,207 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2022-12-14 07:27:03,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634616941] [2022-12-14 07:27:03,207 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:27:03,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 07:27:03,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:27:03,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 07:27:03,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2022-12-14 07:27:03,209 INFO L87 Difference]: Start difference. First operand 96 states and 113 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 6 states have call successors, (23), 3 states have call predecessors, (23), 1 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-12-14 07:27:04,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:27:04,255 INFO L93 Difference]: Finished difference Result 120 states and 143 transitions. [2022-12-14 07:27:04,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 07:27:04,256 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 6 states have call successors, (23), 3 states have call predecessors, (23), 1 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 74 [2022-12-14 07:27:04,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:27:04,257 INFO L225 Difference]: With dead ends: 120 [2022-12-14 07:27:04,257 INFO L226 Difference]: Without dead ends: 118 [2022-12-14 07:27:04,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 196 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2022-12-14 07:27:04,258 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 8 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 07:27:04,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 161 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 07:27:04,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-12-14 07:27:04,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 115. [2022-12-14 07:27:04,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 71 states have internal predecessors, (73), 32 states have call successors, (32), 14 states have call predecessors, (32), 14 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2022-12-14 07:27:04,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 136 transitions. [2022-12-14 07:27:04,289 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 136 transitions. Word has length 74 [2022-12-14 07:27:04,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:27:04,289 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 136 transitions. [2022-12-14 07:27:04,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 6 states have call successors, (23), 3 states have call predecessors, (23), 1 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-12-14 07:27:04,290 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 136 transitions. [2022-12-14 07:27:04,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-12-14 07:27:04,291 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:27:04,291 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-12-14 07:27:04,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 07:27:04,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:27:04,493 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:27:04,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:27:04,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1175687132, now seen corresponding path program 3 times [2022-12-14 07:27:04,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:27:04,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778602347] [2022-12-14 07:27:04,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:27:04,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:27:04,503 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:27:04,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1572533485] [2022-12-14 07:27:04,503 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:27:04,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:27:04,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:27:04,504 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:27:04,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 07:27:04,567 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:27:04,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:27:04,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 45 conjunts are in the unsatisfiable core [2022-12-14 07:27:04,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:27:05,252 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 57 proven. 58 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2022-12-14 07:27:05,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:28:20,551 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 57 proven. 58 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2022-12-14 07:28:20,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:28:20,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778602347] [2022-12-14 07:28:20,551 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:28:20,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572533485] [2022-12-14 07:28:20,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1572533485] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:28:20,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [772002938] [2022-12-14 07:28:20,553 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:28:20,553 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:28:20,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:28:20,554 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:28:20,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:28:21,806 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-12-14 07:28:21,816 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:28:29,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4520#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:28:29,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:28:29,844 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:28:29,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 22 [2022-12-14 07:28:29,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499483172] [2022-12-14 07:28:29,844 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:28:29,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 07:28:29,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:28:29,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 07:28:29,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=831, Unknown=0, NotChecked=0, Total=992 [2022-12-14 07:28:29,845 INFO L87 Difference]: Start difference. First operand 115 states and 136 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 14 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 11 states have call predecessors, (26), 12 states have call successors, (26) [2022-12-14 07:29:26,940 WARN L233 SmtUtils]: Spent 53.88s on a formula simplification. DAG size of input: 205 DAG size of output: 139 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:29:29,610 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:29:41,237 WARN L233 SmtUtils]: Spent 10.81s on a formula simplification. DAG size of input: 146 DAG size of output: 101 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:29:43,310 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.59s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:29:44,959 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:29:54,480 WARN L233 SmtUtils]: Spent 7.86s on a formula simplification. DAG size of input: 115 DAG size of output: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:30:00,596 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:30:07,650 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:30:09,115 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:30:16,401 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.95s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:31:02,893 WARN L233 SmtUtils]: Spent 42.48s on a formula simplification. DAG size of input: 185 DAG size of output: 146 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:31:05,914 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 07:31:10,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:31:10,089 INFO L93 Difference]: Finished difference Result 142 states and 165 transitions. [2022-12-14 07:31:10,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 07:31:10,090 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 14 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 11 states have call predecessors, (26), 12 states have call successors, (26) Word has length 81 [2022-12-14 07:31:10,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:31:10,090 INFO L225 Difference]: With dead ends: 142 [2022-12-14 07:31:10,091 INFO L226 Difference]: Without dead ends: 140 [2022-12-14 07:31:10,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 207 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 157.2s TimeCoverageRelationStatistics Valid=293, Invalid=1429, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 07:31:10,091 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 52 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 123 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:31:10,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 93 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 527 Invalid, 2 Unknown, 0 Unchecked, 24.1s Time] [2022-12-14 07:31:10,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-12-14 07:31:10,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 134. [2022-12-14 07:31:10,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 85 states have internal predecessors, (88), 33 states have call successors, (33), 18 states have call predecessors, (33), 18 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2022-12-14 07:31:10,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 153 transitions. [2022-12-14 07:31:10,133 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 153 transitions. Word has length 81 [2022-12-14 07:31:10,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:31:10,134 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 153 transitions. [2022-12-14 07:31:10,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 14 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 11 states have call predecessors, (26), 12 states have call successors, (26) [2022-12-14 07:31:10,134 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 153 transitions. [2022-12-14 07:31:10,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 07:31:10,135 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:31:10,135 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 07:31:10,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 07:31:10,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:10,336 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:31:10,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:31:10,338 INFO L85 PathProgramCache]: Analyzing trace with hash 20862120, now seen corresponding path program 2 times [2022-12-14 07:31:10,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:31:10,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172352124] [2022-12-14 07:31:10,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:31:10,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:31:10,357 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:31:10,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1383440152] [2022-12-14 07:31:10,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:31:10,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:10,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:31:10,358 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:31:10,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 07:31:10,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 07:31:10,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:31:10,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 07:31:10,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:31:11,342 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 112 proven. 14 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2022-12-14 07:31:11,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:31:11,902 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 110 proven. 2 refuted. 0 times theorem prover too weak. 365 trivial. 0 not checked. [2022-12-14 07:31:11,902 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:31:11,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172352124] [2022-12-14 07:31:11,902 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:31:11,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383440152] [2022-12-14 07:31:11,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383440152] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:31:11,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306425766] [2022-12-14 07:31:11,903 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 07:31:11,903 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:31:11,903 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:31:11,903 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:31:11,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:31:13,103 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 07:31:13,106 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:31:19,124 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5525#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:31:19,124 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:31:19,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:31:19,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2022-12-14 07:31:19,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050188402] [2022-12-14 07:31:19,125 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:31:19,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 07:31:19,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:31:19,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 07:31:19,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=639, Unknown=1, NotChecked=0, Total=756 [2022-12-14 07:31:19,126 INFO L87 Difference]: Start difference. First operand 134 states and 153 transitions. Second operand has 17 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2022-12-14 07:31:26,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:31:26,112 INFO L93 Difference]: Finished difference Result 140 states and 158 transitions. [2022-12-14 07:31:26,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 07:31:26,112 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) Word has length 92 [2022-12-14 07:31:26,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:31:26,113 INFO L225 Difference]: With dead ends: 140 [2022-12-14 07:31:26,113 INFO L226 Difference]: Without dead ends: 138 [2022-12-14 07:31:26,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 242 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=210, Invalid=1121, Unknown=1, NotChecked=0, Total=1332 [2022-12-14 07:31:26,114 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 27 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:31:26,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 56 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-12-14 07:31:26,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-12-14 07:31:26,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-12-14 07:31:26,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 85 states have (on average 1.0705882352941176) internal successors, (91), 88 states have internal predecessors, (91), 33 states have call successors, (33), 19 states have call predecessors, (33), 19 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2022-12-14 07:31:26,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 156 transitions. [2022-12-14 07:31:26,175 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 156 transitions. Word has length 92 [2022-12-14 07:31:26,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:31:26,175 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 156 transitions. [2022-12-14 07:31:26,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2022-12-14 07:31:26,175 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 156 transitions. [2022-12-14 07:31:26,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-12-14 07:31:26,176 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:31:26,176 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:31:26,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 07:31:26,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:26,378 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:31:26,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:31:26,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1594498315, now seen corresponding path program 1 times [2022-12-14 07:31:26,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:31:26,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277651569] [2022-12-14 07:31:26,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:31:26,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:31:26,400 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:31:26,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [340307975] [2022-12-14 07:31:26,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:31:26,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:26,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:31:26,404 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:31:26,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 07:31:26,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:31:26,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 07:31:26,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:31:26,740 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 31 proven. 73 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2022-12-14 07:31:26,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:31:27,502 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 31 proven. 73 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2022-12-14 07:31:27,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:31:27,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277651569] [2022-12-14 07:31:27,502 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:31:27,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340307975] [2022-12-14 07:31:27,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340307975] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:31:27,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [723583412] [2022-12-14 07:31:27,503 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 07:31:27,503 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:31:27,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:31:27,503 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:31:27,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:31:28,619 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-12-14 07:31:28,630 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:31:30,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6562#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:31:30,386 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:31:30,386 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:31:30,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2022-12-14 07:31:30,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793031869] [2022-12-14 07:31:30,386 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:31:30,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 07:31:30,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:31:30,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 07:31:30,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 07:31:30,388 INFO L87 Difference]: Start difference. First operand 138 states and 156 transitions. Second operand has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 19 states have internal predecessors, (39), 14 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (32), 12 states have call predecessors, (32), 14 states have call successors, (32) [2022-12-14 07:31:31,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:31:31,447 INFO L93 Difference]: Finished difference Result 146 states and 164 transitions. [2022-12-14 07:31:31,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 07:31:31,448 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 19 states have internal predecessors, (39), 14 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (32), 12 states have call predecessors, (32), 14 states have call successors, (32) Word has length 97 [2022-12-14 07:31:31,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:31:31,449 INFO L225 Difference]: With dead ends: 146 [2022-12-14 07:31:31,449 INFO L226 Difference]: Without dead ends: 138 [2022-12-14 07:31:31,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 251 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=185, Invalid=1375, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 07:31:31,449 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 25 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 591 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 591 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 07:31:31,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 131 Invalid, 633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 591 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 07:31:31,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-12-14 07:31:31,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2022-12-14 07:31:31,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 88 states have internal predecessors, (89), 32 states have call successors, (32), 19 states have call predecessors, (32), 19 states have return successors, (31), 28 states have call predecessors, (31), 31 states have call successors, (31) [2022-12-14 07:31:31,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 152 transitions. [2022-12-14 07:31:31,503 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 152 transitions. Word has length 97 [2022-12-14 07:31:31,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:31:31,503 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 152 transitions. [2022-12-14 07:31:31,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 19 states have internal predecessors, (39), 14 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (32), 12 states have call predecessors, (32), 14 states have call successors, (32) [2022-12-14 07:31:31,503 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 152 transitions. [2022-12-14 07:31:31,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-12-14 07:31:31,504 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:31:31,504 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2022-12-14 07:31:31,508 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 07:31:31,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 07:31:31,706 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:31:31,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:31:31,707 INFO L85 PathProgramCache]: Analyzing trace with hash -2029647118, now seen corresponding path program 4 times [2022-12-14 07:31:31,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:31:31,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587277595] [2022-12-14 07:31:31,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:31:31,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:31:31,724 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:31:31,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [869100691] [2022-12-14 07:31:31,724 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:31:31,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:31,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:31:31,725 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:31:31,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 07:31:31,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:31:31,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 07:31:31,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:31:31,821 INFO L134 CoverageAnalysis]: Checked inductivity of 548 backedges. 99 proven. 27 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2022-12-14 07:31:31,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:31:31,938 INFO L134 CoverageAnalysis]: Checked inductivity of 548 backedges. 41 proven. 27 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2022-12-14 07:31:31,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:31:31,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587277595] [2022-12-14 07:31:31,938 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:31:31,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869100691] [2022-12-14 07:31:31,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869100691] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:31:31,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202813981] [2022-12-14 07:31:31,939 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:31:31,939 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:31:31,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:31:31,939 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:31:31,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:31:34,934 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:31:34,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:31:39,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7591#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:31:39,361 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:31:39,361 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:31:39,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2022-12-14 07:31:39,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987578749] [2022-12-14 07:31:39,362 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:31:39,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 07:31:39,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:31:39,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 07:31:39,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2022-12-14 07:31:39,363 INFO L87 Difference]: Start difference. First operand 136 states and 152 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 6 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 6 states have call predecessors, (27), 6 states have call successors, (27) [2022-12-14 07:31:39,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:31:39,455 INFO L93 Difference]: Finished difference Result 160 states and 179 transitions. [2022-12-14 07:31:39,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:31:39,456 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 6 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 6 states have call predecessors, (27), 6 states have call successors, (27) Word has length 98 [2022-12-14 07:31:39,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:31:39,457 INFO L225 Difference]: With dead ends: 160 [2022-12-14 07:31:39,457 INFO L226 Difference]: Without dead ends: 122 [2022-12-14 07:31:39,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 269 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2022-12-14 07:31:39,458 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 0 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:31:39,458 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 130 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:31:39,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-12-14 07:31:39,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-12-14 07:31:39,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 79 states have internal predecessors, (80), 27 states have call successors, (27), 18 states have call predecessors, (27), 18 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2022-12-14 07:31:39,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 133 transitions. [2022-12-14 07:31:39,502 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 133 transitions. Word has length 98 [2022-12-14 07:31:39,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:31:39,503 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 133 transitions. [2022-12-14 07:31:39,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 6 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 6 states have call predecessors, (27), 6 states have call successors, (27) [2022-12-14 07:31:39,503 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 133 transitions. [2022-12-14 07:31:39,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 07:31:39,503 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:31:39,503 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2022-12-14 07:31:39,507 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 07:31:39,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 07:31:39,705 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:31:39,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:31:39,706 INFO L85 PathProgramCache]: Analyzing trace with hash 696476516, now seen corresponding path program 5 times [2022-12-14 07:31:39,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:31:39,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251174497] [2022-12-14 07:31:39,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:31:39,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:31:39,724 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:31:39,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6265985] [2022-12-14 07:31:39,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:31:39,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:39,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:31:39,726 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:31:39,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 07:31:39,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 07:31:39,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:31:39,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 07:31:39,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:31:40,341 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 78 proven. 44 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2022-12-14 07:31:40,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:31:49,914 WARN L233 SmtUtils]: Spent 6.48s on a formula simplification. DAG size of input: 60 DAG size of output: 60 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:31:50,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:31:50,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251174497] [2022-12-14 07:31:50,548 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:31:50,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6265985] [2022-12-14 07:31:50,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6265985] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:31:50,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1048540390] [2022-12-14 07:31:50,549 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:31:50,549 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:31:50,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:31:50,549 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:31:50,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:31:51,856 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:31:51,865 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:31:53,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8411#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:31:53,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:31:53,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-12-14 07:31:53,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-12-14 07:31:53,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770045346] [2022-12-14 07:31:53,859 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-12-14 07:31:53,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 07:31:53,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:31:53,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 07:31:53,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2022-12-14 07:31:53,860 INFO L87 Difference]: Start difference. First operand 122 states and 133 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-12-14 07:31:54,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:31:54,789 INFO L93 Difference]: Finished difference Result 156 states and 167 transitions. [2022-12-14 07:31:54,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 07:31:54,790 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 103 [2022-12-14 07:31:54,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:31:54,791 INFO L225 Difference]: With dead ends: 156 [2022-12-14 07:31:54,791 INFO L226 Difference]: Without dead ends: 144 [2022-12-14 07:31:54,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 195 SyntacticMatches, 8 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=130, Invalid=740, Unknown=0, NotChecked=0, Total=870 [2022-12-14 07:31:54,792 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 12 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 07:31:54,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 107 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 07:31:54,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-12-14 07:31:54,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2022-12-14 07:31:54,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 91 states have (on average 1.043956043956044) internal successors, (95), 93 states have internal predecessors, (95), 30 states have call successors, (30), 22 states have call predecessors, (30), 22 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2022-12-14 07:31:54,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2022-12-14 07:31:54,842 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 103 [2022-12-14 07:31:54,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:31:54,842 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2022-12-14 07:31:54,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-12-14 07:31:54,843 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2022-12-14 07:31:54,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 07:31:54,843 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:31:54,844 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 5, 5, 5, 5, 5, 5, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:31:54,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-12-14 07:31:55,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 07:31:55,044 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:31:55,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:31:55,045 INFO L85 PathProgramCache]: Analyzing trace with hash -1422080051, now seen corresponding path program 6 times [2022-12-14 07:31:55,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:31:55,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808016005] [2022-12-14 07:31:55,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:31:55,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:31:55,058 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:31:55,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [445132240] [2022-12-14 07:31:55,058 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:31:55,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:31:55,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:31:55,060 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:31:55,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 07:31:55,141 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:31:55,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:31:55,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 43 conjunts are in the unsatisfiable core [2022-12-14 07:31:55,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:31:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 69 proven. 65 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2022-12-14 07:31:55,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:32:01,275 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 69 proven. 65 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2022-12-14 07:32:01,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:32:01,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808016005] [2022-12-14 07:32:01,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:32:01,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445132240] [2022-12-14 07:32:01,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445132240] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:32:01,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [31600774] [2022-12-14 07:32:01,277 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:32:01,277 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:32:01,277 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:32:01,277 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:32:01,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:32:02,320 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:32:02,326 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:32:05,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9492#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:32:05,947 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:32:05,947 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:32:05,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2022-12-14 07:32:05,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603764677] [2022-12-14 07:32:05,947 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:32:05,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 07:32:05,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:32:05,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 07:32:05,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=890, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 07:32:05,949 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 21 states have internal predecessors, (41), 15 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 12 states have call predecessors, (34), 13 states have call successors, (34) [2022-12-14 07:32:20,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:32:20,909 INFO L93 Difference]: Finished difference Result 190 states and 211 transitions. [2022-12-14 07:32:20,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 07:32:20,910 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 21 states have internal predecessors, (41), 15 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 12 states have call predecessors, (34), 13 states have call successors, (34) Word has length 103 [2022-12-14 07:32:20,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:32:20,911 INFO L225 Difference]: With dead ends: 190 [2022-12-14 07:32:20,911 INFO L226 Difference]: Without dead ends: 188 [2022-12-14 07:32:20,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 270 SyntacticMatches, 6 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=296, Invalid=1426, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 07:32:20,912 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 52 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 772 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 772 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:32:20,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 134 Invalid, 887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 772 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-12-14 07:32:20,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-12-14 07:32:20,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 179. [2022-12-14 07:32:20,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 113 states have (on average 1.0442477876106195) internal successors, (118), 116 states have internal predecessors, (118), 38 states have call successors, (38), 27 states have call predecessors, (38), 27 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2022-12-14 07:32:20,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 193 transitions. [2022-12-14 07:32:20,986 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 193 transitions. Word has length 103 [2022-12-14 07:32:20,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:32:20,986 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 193 transitions. [2022-12-14 07:32:20,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 21 states have internal predecessors, (41), 15 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 12 states have call predecessors, (34), 13 states have call successors, (34) [2022-12-14 07:32:20,986 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 193 transitions. [2022-12-14 07:32:20,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-12-14 07:32:20,987 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:32:20,987 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-12-14 07:32:20,991 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 07:32:21,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 07:32:21,188 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:32:21,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:32:21,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1708968712, now seen corresponding path program 7 times [2022-12-14 07:32:21,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:32:21,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376535456] [2022-12-14 07:32:21,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:32:21,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:32:21,215 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 07:32:21,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1205820784] [2022-12-14 07:32:21,216 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:32:21,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:32:21,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:32:21,220 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:32:21,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7225f968-21a0-40af-bc93-4a7ae418ba54/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 07:32:21,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:32:21,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 07:32:21,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:32:22,443 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 78 proven. 141 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2022-12-14 07:32:22,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:35:08,746 WARN L233 SmtUtils]: Spent 48.17s on a formula simplification that was a NOOP. DAG size: 546 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:38:29,009 WARN L233 SmtUtils]: Spent 37.71s on a formula simplification. DAG size of input: 256 DAG size of output: 255 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 07:39:57,784 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 97 proven. 83 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2022-12-14 07:39:57,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:39:57,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376535456] [2022-12-14 07:39:57,785 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 07:39:57,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205820784] [2022-12-14 07:39:57,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205820784] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:39:57,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [424239177] [2022-12-14 07:39:57,786 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 07:39:57,786 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:39:57,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:39:57,787 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:39:57,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:39:58,854 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-12-14 07:39:58,860 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:40:13,849 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10737#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:40:13,850 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:40:13,850 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 07:40:13,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2022-12-14 07:40:13,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453470638] [2022-12-14 07:40:13,850 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 07:40:13,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 07:40:13,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:40:13,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 07:40:13,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1025, Unknown=2, NotChecked=0, Total=1190 [2022-12-14 07:40:13,851 INFO L87 Difference]: Start difference. First operand 179 states and 193 transitions. Second operand has 25 states, 25 states have (on average 1.8) internal successors, (45), 22 states have internal predecessors, (45), 17 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 15 states have call predecessors, (36), 15 states have call successors, (36)