./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW --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 6977cec8a403ff3f16926270da45a38f7b1f51a39c72ba3797fb74b9637fd796 --- 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-4e7fbc6 [2022-11-23 14:28:14,648 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:28:14,651 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:28:14,690 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:28:14,691 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:28:14,694 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:28:14,697 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:28:14,700 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:28:14,702 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:28:14,707 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:28:14,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:28:14,711 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:28:14,712 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:28:14,714 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:28:14,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:28:14,717 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:28:14,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:28:14,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:28:14,721 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:28:14,728 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:28:14,729 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:28:14,732 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:28:14,733 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:28:14,734 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:28:14,744 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:28:14,744 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:28:14,744 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:28:14,746 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:28:14,747 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:28:14,747 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:28:14,748 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:28:14,750 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:28:14,751 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:28:14,752 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:28:14,753 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:28:14,754 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:28:14,754 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:28:14,754 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:28:14,755 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:28:14,756 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:28:14,757 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:28:14,758 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:28:14,795 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:28:14,795 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:28:14,796 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:28:14,796 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:28:14,797 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:28:14,797 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:28:14,798 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:28:14,798 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:28:14,798 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:28:14,798 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:28:14,799 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:28:14,800 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:28:14,800 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:28:14,800 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:28:14,800 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:28:14,800 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:28:14,801 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:28:14,801 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:28:14,802 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:28:14,802 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:28:14,802 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:28:14,802 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:28:14,802 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:28:14,803 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:28:14,803 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:28:14,803 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:28:14,803 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:28:14,803 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:28:14,804 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:28:14,804 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:28:14,804 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:28:14,805 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:28:14,805 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:28:14,805 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:28:14,805 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:28:14,806 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:28:14,806 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:28:14,806 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:28:14,806 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:28:14,806 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:28:14,807 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:28:14,807 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_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6977cec8a403ff3f16926270da45a38f7b1f51a39c72ba3797fb74b9637fd796 [2022-11-23 14:28:15,120 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:28:15,150 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:28:15,152 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:28:15,154 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:28:15,154 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:28:15,155 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound20.c [2022-11-23 14:28:18,159 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:28:18,368 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:28:18,369 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound20.c [2022-11-23 14:28:18,376 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/data/6535d85cb/25f85af7b8004bf3a38fd8731e96c2a6/FLAG07a80ac70 [2022-11-23 14:28:18,392 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/data/6535d85cb/25f85af7b8004bf3a38fd8731e96c2a6 [2022-11-23 14:28:18,397 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:28:18,399 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:28:18,402 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:28:18,402 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:28:18,406 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:28:18,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,409 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bb86e51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18, skipping insertion in model container [2022-11-23 14:28:18,409 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,417 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:28:18,442 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:28:18,636 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_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound20.c[538,551] [2022-11-23 14:28:18,667 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:28:18,684 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:28:18,699 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_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound20.c[538,551] [2022-11-23 14:28:18,722 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:28:18,736 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:28:18,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18 WrapperNode [2022-11-23 14:28:18,737 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:28:18,739 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:28:18,739 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:28:18,739 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:28:18,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,754 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,779 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 55 [2022-11-23 14:28:18,780 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:28:18,781 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:28:18,781 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:28:18,781 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:28:18,791 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,792 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,802 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,803 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,810 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,823 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,824 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,826 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:28:18,831 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:28:18,831 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:28:18,831 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:28:18,832 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (1/1) ... [2022-11-23 14:28:18,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:28:18,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:28:18,868 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:28:18,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:28:18,921 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:28:18,921 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-23 14:28:18,921 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-23 14:28:18,921 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:28:18,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:28:18,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:28:18,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:28:18,922 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:28:18,996 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:28:18,998 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:28:19,165 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:28:19,209 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:28:19,218 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 14:28:19,221 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:28:19 BoogieIcfgContainer [2022-11-23 14:28:19,221 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:28:19,231 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:28:19,231 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:28:19,234 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:28:19,250 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:28:18" (1/3) ... [2022-11-23 14:28:19,251 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@137e4b1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:28:19, skipping insertion in model container [2022-11-23 14:28:19,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:28:18" (2/3) ... [2022-11-23 14:28:19,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@137e4b1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:28:19, skipping insertion in model container [2022-11-23 14:28:19,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:28:19" (3/3) ... [2022-11-23 14:28:19,253 INFO L112 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound20.c [2022-11-23 14:28:19,283 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:28:19,283 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:28:19,338 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:28:19,345 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;@223f5fa9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:28:19,345 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:28:19,350 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:28:19,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:28:19,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:28:19,359 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:28:19,361 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:28:19,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:28:19,369 INFO L85 PathProgramCache]: Analyzing trace with hash 763440750, now seen corresponding path program 1 times [2022-11-23 14:28:19,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:28:19,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773948349] [2022-11-23 14:28:19,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:19,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:28:19,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:28:19,900 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:28:19,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:28:19,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773948349] [2022-11-23 14:28:19,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773948349] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:28:19,902 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:28:19,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:28:19,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330601958] [2022-11-23 14:28:19,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:28:19,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:28:19,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:28:19,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:28:19,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:28:19,939 INFO L87 Difference]: Start difference. First operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:28:20,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:28:20,031 INFO L93 Difference]: Finished difference Result 58 states and 96 transitions. [2022-11-23 14:28:20,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:28:20,034 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), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17 [2022-11-23 14:28:20,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:28:20,042 INFO L225 Difference]: With dead ends: 58 [2022-11-23 14:28:20,042 INFO L226 Difference]: Without dead ends: 35 [2022-11-23 14:28:20,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:28:20,049 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:28:20,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 108 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:28:20,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-23 14:28:20,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2022-11-23 14:28:20,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:28:20,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2022-11-23 14:28:20,103 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 17 [2022-11-23 14:28:20,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:28:20,104 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2022-11-23 14:28:20,104 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), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:28:20,104 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2022-11-23 14:28:20,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-23 14:28:20,105 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:28:20,105 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:28:20,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:28:20,106 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:28:20,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:28:20,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1804559349, now seen corresponding path program 1 times [2022-11-23 14:28:20,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:28:20,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038857013] [2022-11-23 14:28:20,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:20,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:28:20,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:28:20,229 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:28:20,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:28:20,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038857013] [2022-11-23 14:28:20,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038857013] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:28:20,230 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:28:20,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:28:20,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903616805] [2022-11-23 14:28:20,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:28:20,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:28:20,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:28:20,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:28:20,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:28:20,234 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-23 14:28:20,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:28:20,307 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2022-11-23 14:28:20,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:28:20,307 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 22 [2022-11-23 14:28:20,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:28:20,309 INFO L225 Difference]: With dead ends: 41 [2022-11-23 14:28:20,309 INFO L226 Difference]: Without dead ends: 39 [2022-11-23 14:28:20,309 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 [2022-11-23 14:28:20,311 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 8 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:28:20,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 100 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:28:20,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-11-23 14:28:20,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2022-11-23 14:28:20,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:28:20,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2022-11-23 14:28:20,323 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 22 [2022-11-23 14:28:20,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:28:20,323 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2022-11-23 14:28:20,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-23 14:28:20,324 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2022-11-23 14:28:20,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 14:28:20,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:28:20,325 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:28:20,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:28:20,325 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:28:20,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:28:20,326 INFO L85 PathProgramCache]: Analyzing trace with hash 496345742, now seen corresponding path program 1 times [2022-11-23 14:28:20,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:28:20,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319307945] [2022-11-23 14:28:20,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:20,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:28:20,343 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:28:20,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1223135691] [2022-11-23 14:28:20,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:20,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:20,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:28:20,350 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:28:20,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:28:20,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:28:20,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:28:20,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:28:20,634 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-23 14:28:20,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:28:20,793 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-23 14:28:20,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:28:20,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319307945] [2022-11-23 14:28:20,794 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:28:20,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223135691] [2022-11-23 14:28:20,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223135691] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:28:20,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [476262589] [2022-11-23 14:28:20,814 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:28:20,815 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:28:20,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:28:20,823 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:28:20,824 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:28:21,485 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-23 14:28:21,503 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2022-11-23 14:28:21,505 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:28:22,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [476262589] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:28:22,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:28:22,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [8, 7] total 21 [2022-11-23 14:28:22,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534714884] [2022-11-23 14:28:22,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:28:22,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-23 14:28:22,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:28:22,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-23 14:28:22,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:28:22,267 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 11 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-23 14:28:22,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:28:22,716 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2022-11-23 14:28:22,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:28:22,717 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 27 [2022-11-23 14:28:22,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:28:22,721 INFO L225 Difference]: With dead ends: 68 [2022-11-23 14:28:22,721 INFO L226 Difference]: Without dead ends: 50 [2022-11-23 14:28:22,722 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:28:22,725 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 53 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:28:22,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 39 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:28:22,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-23 14:28:22,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-23 14:28:22,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.103448275862069) internal successors, (32), 30 states have internal predecessors, (32), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-23 14:28:22,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-11-23 14:28:22,790 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 27 [2022-11-23 14:28:22,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:28:22,792 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-11-23 14:28:22,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-23 14:28:22,793 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-11-23 14:28:22,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-23 14:28:22,794 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:28:22,794 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:28:22,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:28:22,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:23,000 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:28:23,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:28:23,001 INFO L85 PathProgramCache]: Analyzing trace with hash -202147981, now seen corresponding path program 1 times [2022-11-23 14:28:23,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:28:23,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144441264] [2022-11-23 14:28:23,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:23,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:28:23,020 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:28:23,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1246772623] [2022-11-23 14:28:23,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:23,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:23,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:28:23,031 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:28:23,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:28:23,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:28:23,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 14:28:23,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:28:23,406 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 11 proven. 17 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-23 14:28:23,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:28:23,600 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 11 proven. 13 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 14:28:23,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:28:23,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144441264] [2022-11-23 14:28:23,601 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:28:23,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246772623] [2022-11-23 14:28:23,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246772623] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:28:23,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001144999] [2022-11-23 14:28:23,604 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 14:28:23,605 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:28:23,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:28:23,605 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:28:23,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:28:26,193 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:28:26,198 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2022-11-23 14:28:26,199 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:28:26,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '917#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:28:26,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:28:26,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:28:26,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 15 [2022-11-23 14:28:26,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495624860] [2022-11-23 14:28:26,838 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:28:26,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:28:26,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:28:26,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:28:26,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-11-23 14:28:26,839 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 6 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2022-11-23 14:28:27,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:28:27,228 INFO L93 Difference]: Finished difference Result 82 states and 104 transitions. [2022-11-23 14:28:27,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:28:27,235 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 6 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) Word has length 44 [2022-11-23 14:28:27,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:28:27,237 INFO L225 Difference]: With dead ends: 82 [2022-11-23 14:28:27,237 INFO L226 Difference]: Without dead ends: 69 [2022-11-23 14:28:27,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:28:27,239 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 42 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:28:27,240 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 88 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:28:27,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-23 14:28:27,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-11-23 14:28:27,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 21 states have call successors, (21), 8 states have call predecessors, (21), 8 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-23 14:28:27,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 84 transitions. [2022-11-23 14:28:27,276 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 84 transitions. Word has length 44 [2022-11-23 14:28:27,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:28:27,276 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 84 transitions. [2022-11-23 14:28:27,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 6 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2022-11-23 14:28:27,277 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 84 transitions. [2022-11-23 14:28:27,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-23 14:28:27,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:28:27,281 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:28:27,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:28:27,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:27,487 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:28:27,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:28:27,488 INFO L85 PathProgramCache]: Analyzing trace with hash -567180131, now seen corresponding path program 1 times [2022-11-23 14:28:27,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:28:27,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654196990] [2022-11-23 14:28:27,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:27,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:28:27,507 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:28:27,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1187942860] [2022-11-23 14:28:27,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:27,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:27,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:28:27,515 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:28:27,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:28:27,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:28:27,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-23 14:28:27,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:28:28,009 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 13 proven. 6 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-23 14:28:28,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:28:28,240 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 14:28:28,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:28:28,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654196990] [2022-11-23 14:28:28,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:28:28,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187942860] [2022-11-23 14:28:28,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187942860] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:28:28,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1015074313] [2022-11-23 14:28:28,244 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-23 14:28:28,244 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:28:28,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:28:28,245 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:28:28,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:28:30,293 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:28:30,336 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2022-11-23 14:28:30,337 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:28:31,286 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1479#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:28:31,286 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:28:31,286 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:28:31,286 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2022-11-23 14:28:31,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996388811] [2022-11-23 14:28:31,287 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:28:31,287 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:28:31,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:28:31,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:28:31,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2022-11-23 14:28:31,288 INFO L87 Difference]: Start difference. First operand 69 states and 84 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 8 states have call successors, (19), 3 states have call predecessors, (19), 2 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-23 14:28:31,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:28:31,680 INFO L93 Difference]: Finished difference Result 85 states and 98 transitions. [2022-11-23 14:28:31,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:28:31,681 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 8 states have call successors, (19), 3 states have call predecessors, (19), 2 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) Word has length 51 [2022-11-23 14:28:31,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:28:31,682 INFO L225 Difference]: With dead ends: 85 [2022-11-23 14:28:31,683 INFO L226 Difference]: Without dead ends: 83 [2022-11-23 14:28:31,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:28:31,684 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 40 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:28:31,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 124 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:28:31,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-23 14:28:31,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 81. [2022-11-23 14:28:31,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 50 states have internal predecessors, (52), 21 states have call successors, (21), 11 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-23 14:28:31,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2022-11-23 14:28:31,729 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 51 [2022-11-23 14:28:31,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:28:31,730 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2022-11-23 14:28:31,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 8 states have call successors, (19), 3 states have call predecessors, (19), 2 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-23 14:28:31,730 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2022-11-23 14:28:31,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-23 14:28:31,737 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:28:31,737 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:28:31,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:28:31,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:31,943 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:28:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:28:31,943 INFO L85 PathProgramCache]: Analyzing trace with hash 166119996, now seen corresponding path program 1 times [2022-11-23 14:28:31,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:28:31,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118402545] [2022-11-23 14:28:31,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:31,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:28:31,960 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:28:31,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [897890069] [2022-11-23 14:28:31,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:28:31,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:28:31,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:28:31,963 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:28:31,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:28:32,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:28:32,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 14:28:32,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:28:32,662 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 38 proven. 8 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-23 14:28:32,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:29:05,842 WARN L233 SmtUtils]: Spent 14.98s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:29:40,254 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 8 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2022-11-23 14:29:40,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:29:40,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118402545] [2022-11-23 14:29:40,254 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:29:40,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897890069] [2022-11-23 14:29:40,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [897890069] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:29:40,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1234855447] [2022-11-23 14:29:40,257 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-23 14:29:40,257 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:29:40,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:29:40,258 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:29:40,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:29:43,011 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2022-11-23 14:29:43,038 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2022-11-23 14:29:43,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:29:46,273 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2134#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:29:46,273 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:29:46,274 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:29:46,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 20 [2022-11-23 14:29:46,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786241014] [2022-11-23 14:29:46,274 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:29:46,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 14:29:46,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:29:46,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 14:29:46,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:29:46,277 INFO L87 Difference]: Start difference. First operand 81 states and 93 transitions. Second operand has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 16 states have internal predecessors, (33), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 10 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:30:08,346 WARN L233 SmtUtils]: Spent 15.90s on a formula simplification. DAG size of input: 65 DAG size of output: 47 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:30:10,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:30:10,723 INFO L93 Difference]: Finished difference Result 100 states and 115 transitions. [2022-11-23 14:30:10,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:30:10,724 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 16 states have internal predecessors, (33), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 10 states have call predecessors, (20), 7 states have call successors, (20) Word has length 63 [2022-11-23 14:30:10,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:30:10,726 INFO L225 Difference]: With dead ends: 100 [2022-11-23 14:30:10,726 INFO L226 Difference]: Without dead ends: 98 [2022-11-23 14:30:10,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 147 SyntacticMatches, 10 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 40.8s TimeCoverageRelationStatistics Valid=201, Invalid=1281, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:30:10,729 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 62 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:30:10,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 125 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-11-23 14:30:10,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-23 14:30:10,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2022-11-23 14:30:10,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 58 states have internal predecessors, (61), 22 states have call successors, (22), 13 states have call predecessors, (22), 13 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-23 14:30:10,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2022-11-23 14:30:10,766 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 63 [2022-11-23 14:30:10,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:30:10,766 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2022-11-23 14:30:10,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 16 states have internal predecessors, (33), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 10 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:30:10,767 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2022-11-23 14:30:10,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-23 14:30:10,768 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:30:10,768 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:30:10,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:30:10,974 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:30:10,974 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:30:10,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:30:10,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1987386298, now seen corresponding path program 1 times [2022-11-23 14:30:10,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:30:10,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23106637] [2022-11-23 14:30:10,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:30:10,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:30:10,984 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:30:10,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1284070328] [2022-11-23 14:30:10,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:30:10,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:30:10,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:30:10,986 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:30:10,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:30:11,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:30:11,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:30:11,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:30:11,425 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 22 proven. 9 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2022-11-23 14:30:11,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:30:11,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:30:11,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23106637] [2022-11-23 14:30:11,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:30:11,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284070328] [2022-11-23 14:30:11,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284070328] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:30:11,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1135077] [2022-11-23 14:30:11,986 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 14:30:11,986 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:30:11,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:30:11,987 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:30:11,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:30:14,348 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:30:14,351 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2022-11-23 14:30:14,353 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:30:15,134 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2733#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:30:15,135 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:30:15,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:30:15,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-11-23 14:30:15,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599771764] [2022-11-23 14:30:15,135 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 14:30:15,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-23 14:30:15,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:30:15,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-23 14:30:15,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:30:15,137 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-23 14:30:15,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:30:15,814 INFO L93 Difference]: Finished difference Result 102 states and 115 transitions. [2022-11-23 14:30:15,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 14:30:15,814 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) Word has length 74 [2022-11-23 14:30:15,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:30:15,815 INFO L225 Difference]: With dead ends: 102 [2022-11-23 14:30:15,816 INFO L226 Difference]: Without dead ends: 82 [2022-11-23 14:30:15,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 14:30:15,822 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 25 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:30:15,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 136 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:30:15,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-23 14:30:15,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-11-23 14:30:15,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 50 states have (on average 1.06) internal successors, (53), 51 states have internal predecessors, (53), 19 states have call successors, (19), 12 states have call predecessors, (19), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:30:15,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 90 transitions. [2022-11-23 14:30:15,860 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 90 transitions. Word has length 74 [2022-11-23 14:30:15,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:30:15,861 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 90 transitions. [2022-11-23 14:30:15,861 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-23 14:30:15,861 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 90 transitions. [2022-11-23 14:30:15,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-23 14:30:15,862 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:30:15,862 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:30:15,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:30:16,068 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:30:16,068 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:30:16,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:30:16,069 INFO L85 PathProgramCache]: Analyzing trace with hash 152662242, now seen corresponding path program 2 times [2022-11-23 14:30:16,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:30:16,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513206591] [2022-11-23 14:30:16,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:30:16,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:30:16,085 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:30:16,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [531618224] [2022-11-23 14:30:16,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:30:16,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:30:16,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:30:16,095 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:30:16,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:30:16,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:30:16,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:30:16,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 14:30:16,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:30:16,589 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 43 proven. 34 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2022-11-23 14:30:16,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:30:18,007 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2022-11-23 14:30:18,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:30:18,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513206591] [2022-11-23 14:30:18,008 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:30:18,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531618224] [2022-11-23 14:30:18,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531618224] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:30:18,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1988685669] [2022-11-23 14:30:18,011 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-23 14:30:18,011 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:30:18,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:30:18,012 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:30:18,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:30:20,380 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2022-11-23 14:30:20,390 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2022-11-23 14:30:20,392 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:30:21,669 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3548#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:30:21,670 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:30:21,670 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:30:21,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 18 [2022-11-23 14:30:21,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931644162] [2022-11-23 14:30:21,670 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:30:21,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 14:30:21,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:30:21,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 14:30:21,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:30:21,672 INFO L87 Difference]: Start difference. First operand 82 states and 90 transitions. Second operand has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (25), 9 states have call predecessors, (25), 9 states have call successors, (25) [2022-11-23 14:30:24,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:30:24,869 INFO L93 Difference]: Finished difference Result 108 states and 124 transitions. [2022-11-23 14:30:24,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 14:30:24,870 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (25), 9 states have call predecessors, (25), 9 states have call successors, (25) Word has length 85 [2022-11-23 14:30:24,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:30:24,871 INFO L225 Difference]: With dead ends: 108 [2022-11-23 14:30:24,872 INFO L226 Difference]: Without dead ends: 106 [2022-11-23 14:30:24,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 210 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 14:30:24,873 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 53 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:30:24,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 119 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-23 14:30:24,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-23 14:30:24,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-11-23 14:30:24,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 65 states have internal predecessors, (67), 28 states have call successors, (28), 14 states have call predecessors, (28), 14 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2022-11-23 14:30:24,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 122 transitions. [2022-11-23 14:30:24,908 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 122 transitions. Word has length 85 [2022-11-23 14:30:24,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:30:24,909 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 122 transitions. [2022-11-23 14:30:24,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (25), 9 states have call predecessors, (25), 9 states have call successors, (25) [2022-11-23 14:30:24,909 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 122 transitions. [2022-11-23 14:30:24,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-23 14:30:24,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:30:24,911 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:30:24,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:30:25,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:30:25,115 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:30:25,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:30:25,115 INFO L85 PathProgramCache]: Analyzing trace with hash 339357760, now seen corresponding path program 3 times [2022-11-23 14:30:25,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:30:25,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360103608] [2022-11-23 14:30:25,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:30:25,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:30:25,125 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:30:25,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [822452013] [2022-11-23 14:30:25,125 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:30:25,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:30:25,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:30:25,126 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:30:25,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbbc5e81-7fe6-4d6f-b87b-775094c1bd7a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:30:25,245 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:30:25,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:30:25,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-23 14:30:25,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:30:26,114 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 72 proven. 43 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2022-11-23 14:30:26,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:34:56,809 WARN L233 SmtUtils]: Spent 5.31s on a formula simplification that was a NOOP. DAG size: 13 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)