./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/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_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/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_991a676e-e0f6-445e-8f8f-0c8ad89f1583/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 cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 --- 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 13:52:13,552 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 13:52:13,555 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 13:52:13,585 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 13:52:13,586 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 13:52:13,587 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 13:52:13,588 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 13:52:13,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 13:52:13,595 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 13:52:13,601 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 13:52:13,603 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 13:52:13,606 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 13:52:13,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 13:52:13,611 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 13:52:13,614 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 13:52:13,616 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 13:52:13,618 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 13:52:13,619 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 13:52:13,620 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 13:52:13,626 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 13:52:13,628 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 13:52:13,630 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 13:52:13,632 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 13:52:13,633 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 13:52:13,640 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 13:52:13,641 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 13:52:13,641 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 13:52:13,642 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 13:52:13,642 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 13:52:13,643 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 13:52:13,643 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 13:52:13,644 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 13:52:13,645 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 13:52:13,645 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 13:52:13,646 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 13:52:13,647 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 13:52:13,648 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 13:52:13,648 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 13:52:13,648 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 13:52:13,649 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 13:52:13,650 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 13:52:13,654 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 13:52:13,687 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 13:52:13,688 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 13:52:13,688 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 13:52:13,688 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 13:52:13,689 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 13:52:13,689 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 13:52:13,690 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 13:52:13,690 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 13:52:13,690 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 13:52:13,690 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 13:52:13,691 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 13:52:13,691 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 13:52:13,691 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 13:52:13,692 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 13:52:13,692 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 13:52:13,692 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 13:52:13,692 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 13:52:13,692 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 13:52:13,693 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 13:52:13,693 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 13:52:13,693 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 13:52:13,693 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 13:52:13,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 13:52:13,694 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 13:52:13,694 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 13:52:13,694 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 13:52:13,695 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 13:52:13,695 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 13:52:13,695 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 13:52:13,695 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 13:52:13,696 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 13:52:13,696 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 13:52:13,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:52:13,696 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 13:52:13,696 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 13:52:13,697 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 13:52:13,697 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 13:52:13,697 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 13:52:13,697 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 13:52:13,697 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 13:52:13,698 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 13:52:13,698 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_991a676e-e0f6-445e-8f8f-0c8ad89f1583/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 [2022-11-23 13:52:14,007 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 13:52:14,032 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 13:52:14,034 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 13:52:14,035 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 13:52:14,036 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 13:52:14,037 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/list-simple/sll2c_remove_all.i [2022-11-23 13:52:17,092 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 13:52:17,417 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 13:52:17,418 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/sv-benchmarks/c/list-simple/sll2c_remove_all.i [2022-11-23 13:52:17,430 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/data/a7e3fd779/12a157abb97a45a2be59e9e6d472257c/FLAGab233ff95 [2022-11-23 13:52:17,444 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/data/a7e3fd779/12a157abb97a45a2be59e9e6d472257c [2022-11-23 13:52:17,447 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 13:52:17,448 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 13:52:17,450 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 13:52:17,450 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 13:52:17,455 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 13:52:17,457 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,458 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a007196 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17, skipping insertion in model container [2022-11-23 13:52:17,459 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,466 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 13:52:17,518 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 13:52:17,855 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_991a676e-e0f6-445e-8f8f-0c8ad89f1583/sv-benchmarks/c/list-simple/sll2c_remove_all.i[24082,24095] [2022-11-23 13:52:17,862 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:52:17,874 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 13:52:17,913 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_991a676e-e0f6-445e-8f8f-0c8ad89f1583/sv-benchmarks/c/list-simple/sll2c_remove_all.i[24082,24095] [2022-11-23 13:52:17,914 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:52:17,938 INFO L208 MainTranslator]: Completed translation [2022-11-23 13:52:17,938 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17 WrapperNode [2022-11-23 13:52:17,939 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 13:52:17,940 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 13:52:17,940 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 13:52:17,940 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 13:52:17,948 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,963 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,982 INFO L138 Inliner]: procedures = 126, calls = 36, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 111 [2022-11-23 13:52:17,983 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 13:52:17,984 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 13:52:17,984 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 13:52:17,984 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 13:52:17,992 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,992 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,996 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:17,996 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:18,004 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:18,008 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:18,010 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:18,011 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:18,014 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 13:52:18,015 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 13:52:18,015 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 13:52:18,015 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 13:52:18,016 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (1/1) ... [2022-11-23 13:52:18,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:52:18,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:52:18,056 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 13:52:18,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2022-11-23 13:52:18,095 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-23 13:52:18,095 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-23 13:52:18,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 13:52:18,096 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-23 13:52:18,096 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 13:52:18,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 13:52:18,096 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 13:52:18,312 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 13:52:18,314 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 13:52:18,554 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 13:52:18,600 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 13:52:18,600 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-23 13:52:18,603 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:52:18 BoogieIcfgContainer [2022-11-23 13:52:18,610 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 13:52:18,613 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 13:52:18,613 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 13:52:18,619 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 13:52:18,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:52:17" (1/3) ... [2022-11-23 13:52:18,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@479f7ae5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:52:18, skipping insertion in model container [2022-11-23 13:52:18,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:17" (2/3) ... [2022-11-23 13:52:18,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@479f7ae5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:52:18, skipping insertion in model container [2022-11-23 13:52:18,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:52:18" (3/3) ... [2022-11-23 13:52:18,624 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_remove_all.i [2022-11-23 13:52:18,643 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 13:52:18,644 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 13:52:18,709 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 13:52:18,716 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;@865bfce, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 13:52:18,717 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 13:52:18,723 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:18,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 13:52:18,731 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:18,731 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:18,732 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:18,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:18,740 INFO L85 PathProgramCache]: Analyzing trace with hash -946009662, now seen corresponding path program 1 times [2022-11-23 13:52:18,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:18,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761673381] [2022-11-23 13:52:18,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:18,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:18,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:19,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:52:19,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:19,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761673381] [2022-11-23 13:52:19,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761673381] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:52:19,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:52:19,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:52:19,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918413656] [2022-11-23 13:52:19,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:52:19,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:52:19,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:19,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:52:19,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:52:19,229 INFO L87 Difference]: Start difference. First operand has 21 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 13:52:19,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:19,309 INFO L93 Difference]: Finished difference Result 35 states and 48 transitions. [2022-11-23 13:52:19,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:52:19,311 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-11-23 13:52:19,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:19,319 INFO L225 Difference]: With dead ends: 35 [2022-11-23 13:52:19,319 INFO L226 Difference]: Without dead ends: 21 [2022-11-23 13:52:19,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:52:19,327 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:19,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 37 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:52:19,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-23 13:52:19,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-11-23 13:52:19,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:19,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2022-11-23 13:52:19,378 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 10 [2022-11-23 13:52:19,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:19,380 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2022-11-23 13:52:19,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 13:52:19,380 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2022-11-23 13:52:19,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 13:52:19,382 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:19,383 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:19,383 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 13:52:19,384 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:19,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:19,385 INFO L85 PathProgramCache]: Analyzing trace with hash 2033469427, now seen corresponding path program 1 times [2022-11-23 13:52:19,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:19,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337784729] [2022-11-23 13:52:19,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:19,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:19,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:19,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:19,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:19,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337784729] [2022-11-23 13:52:19,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337784729] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:52:19,585 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:52:19,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 13:52:19,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472157361] [2022-11-23 13:52:19,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:52:19,586 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:52:19,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:19,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:52:19,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:52:19,588 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 13:52:19,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:19,667 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2022-11-23 13:52:19,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:52:19,668 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2022-11-23 13:52:19,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:19,669 INFO L225 Difference]: With dead ends: 28 [2022-11-23 13:52:19,673 INFO L226 Difference]: Without dead ends: 25 [2022-11-23 13:52:19,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:52:19,675 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:19,675 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 30 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 13:52:19,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-23 13:52:19,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2022-11-23 13:52:19,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:19,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-11-23 13:52:19,693 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2022-11-23 13:52:19,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:19,693 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-11-23 13:52:19,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 13:52:19,694 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-11-23 13:52:19,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-23 13:52:19,695 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:19,695 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:19,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 13:52:19,696 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:19,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:19,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1185136917, now seen corresponding path program 1 times [2022-11-23 13:52:19,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:19,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283649193] [2022-11-23 13:52:19,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:19,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:19,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:19,933 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:19,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:19,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283649193] [2022-11-23 13:52:19,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283649193] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:52:19,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079602631] [2022-11-23 13:52:19,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:19,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:19,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:52:19,939 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:52:19,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 13:52:20,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:20,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 13:52:20,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:52:20,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:20,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 13:52:20,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:20,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079602631] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 13:52:20,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [833605448] [2022-11-23 13:52:20,332 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 13:52:20,333 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 13:52:20,336 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 13:52:20,342 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 13:52:20,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 13:52:20,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,442 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 13:52:20,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-23 13:52:20,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,477 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-23 13:52:20,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-23 13:52:20,531 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 13:52:20,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:20,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,551 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2022-11-23 13:52:20,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2022-11-23 13:52:20,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2022-11-23 13:52:20,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-11-23 13:52:20,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,635 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2022-11-23 13:52:20,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2022-11-23 13:52:20,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:20,780 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-11-23 13:52:21,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2022-11-23 13:52:21,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:21,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:21,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:21,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:21,444 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,446 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,451 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,453 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,455 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:21,822 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:21,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:21,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2022-11-23 13:52:21,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:21,879 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,881 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,883 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,893 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,896 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:21,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-23 13:52:21,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-23 13:52:21,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:21,994 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-11-23 13:52:22,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:22,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 124 [2022-11-23 13:52:22,264 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 124 [2022-11-23 13:52:22,276 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 116 [2022-11-23 13:52:22,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:22,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:22,577 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:22,634 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,635 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,664 INFO L321 Elim1Store]: treesize reduction 52, result has 34.2 percent of original size [2022-11-23 13:52:22,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 73 treesize of output 66 [2022-11-23 13:52:22,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:22,690 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,717 INFO L321 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2022-11-23 13:52:22,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 59 treesize of output 48 [2022-11-23 13:52:22,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:22,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:22,867 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,872 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,873 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,934 INFO L321 Elim1Store]: treesize reduction 100, result has 20.6 percent of original size [2022-11-23 13:52:22,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 88 treesize of output 76 [2022-11-23 13:52:22,955 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:22,956 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:23,003 INFO L321 Elim1Store]: treesize reduction 116, result has 15.9 percent of original size [2022-11-23 13:52:23,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 62 treesize of output 54 [2022-11-23 13:52:23,033 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-23 13:52:23,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2022-11-23 13:52:23,152 INFO L321 Elim1Store]: treesize reduction 41, result has 35.9 percent of original size [2022-11-23 13:52:23,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 57 [2022-11-23 13:52:23,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:23,191 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-23 13:52:23,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 53 treesize of output 39 [2022-11-23 13:52:23,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:23,301 INFO L321 Elim1Store]: treesize reduction 41, result has 35.9 percent of original size [2022-11-23 13:52:23,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 57 [2022-11-23 13:52:23,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:23,334 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-23 13:52:23,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 53 treesize of output 39 [2022-11-23 13:52:23,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:23,459 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 67 for LOIs [2022-11-23 13:52:23,655 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 13:52:26,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '294#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0))) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~len~0#1|)) (<= 0 |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-23 13:52:26,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 13:52:26,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 13:52:26,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-11-23 13:52:26,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336481654] [2022-11-23 13:52:26,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 13:52:26,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 13:52:26,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:26,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 13:52:26,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2022-11-23 13:52:26,075 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-23 13:52:26,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:26,132 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2022-11-23 13:52:26,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 13:52:26,133 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 19 [2022-11-23 13:52:26,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:26,134 INFO L225 Difference]: With dead ends: 29 [2022-11-23 13:52:26,134 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 13:52:26,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2022-11-23 13:52:26,137 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 42 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:26,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 47 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 13:52:26,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 13:52:26,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-23 13:52:26,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:26,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-11-23 13:52:26,152 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2022-11-23 13:52:26,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:26,153 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-11-23 13:52:26,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-23 13:52:26,154 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-11-23 13:52:26,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-23 13:52:26,156 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:26,156 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:26,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 13:52:26,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:26,362 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:26,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:26,362 INFO L85 PathProgramCache]: Analyzing trace with hash 98901171, now seen corresponding path program 2 times [2022-11-23 13:52:26,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:26,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686473480] [2022-11-23 13:52:26,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:26,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:26,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:26,800 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 13:52:26,801 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:26,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686473480] [2022-11-23 13:52:26,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686473480] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:52:26,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:52:26,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 13:52:26,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625905689] [2022-11-23 13:52:26,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:52:26,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 13:52:26,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:26,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 13:52:26,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 13:52:26,805 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 13:52:26,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:26,909 INFO L93 Difference]: Finished difference Result 37 states and 45 transitions. [2022-11-23 13:52:26,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 13:52:26,910 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2022-11-23 13:52:26,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:26,912 INFO L225 Difference]: With dead ends: 37 [2022-11-23 13:52:26,912 INFO L226 Difference]: Without dead ends: 34 [2022-11-23 13:52:26,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-23 13:52:26,916 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 18 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:26,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 48 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:52:26,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-23 13:52:26,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2022-11-23 13:52:26,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:26,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-11-23 13:52:26,921 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2022-11-23 13:52:26,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:26,922 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-11-23 13:52:26,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 13:52:26,922 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-11-23 13:52:26,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 13:52:26,924 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:26,924 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:26,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 13:52:26,924 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:26,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:26,926 INFO L85 PathProgramCache]: Analyzing trace with hash 1033370219, now seen corresponding path program 1 times [2022-11-23 13:52:26,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:26,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65296833] [2022-11-23 13:52:26,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:26,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:26,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:27,330 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 13:52:27,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:27,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65296833] [2022-11-23 13:52:27,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65296833] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:52:27,331 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:52:27,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 13:52:27,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213859422] [2022-11-23 13:52:27,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:52:27,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 13:52:27,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:27,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 13:52:27,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 13:52:27,333 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 13:52:27,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:27,435 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2022-11-23 13:52:27,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 13:52:27,436 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2022-11-23 13:52:27,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:27,437 INFO L225 Difference]: With dead ends: 42 [2022-11-23 13:52:27,437 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 13:52:27,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 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 13:52:27,438 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:27,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 46 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:52:27,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 13:52:27,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-23 13:52:27,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:27,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-23 13:52:27,444 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 25 [2022-11-23 13:52:27,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:27,444 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-23 13:52:27,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 13:52:27,445 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-23 13:52:27,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 13:52:27,445 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:27,445 INFO L195 NwaCegarLoop]: trace histogram [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 13:52:27,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 13:52:27,446 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:27,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:27,446 INFO L85 PathProgramCache]: Analyzing trace with hash 459157702, now seen corresponding path program 1 times [2022-11-23 13:52:27,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:27,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552787696] [2022-11-23 13:52:27,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:27,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:27,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:28,126 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:28,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:28,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552787696] [2022-11-23 13:52:28,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552787696] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:52:28,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [987594564] [2022-11-23 13:52:28,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:28,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:28,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:52:28,129 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:52:28,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 13:52:28,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:28,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-23 13:52:28,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:52:28,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:28,399 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-23 13:52:28,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-23 13:52:28,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:28,475 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-23 13:52:28,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2022-11-23 13:52:28,520 INFO L321 Elim1Store]: treesize reduction 3, result has 81.3 percent of original size [2022-11-23 13:52:28,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 27 [2022-11-23 13:52:28,525 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2022-11-23 13:52:28,545 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:28,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 13:52:28,574 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2022-11-23 13:52:28,641 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 13:52:28,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 45 [2022-11-23 13:52:28,694 INFO L321 Elim1Store]: treesize reduction 21, result has 67.2 percent of original size [2022-11-23 13:52:28,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 121 treesize of output 129 [2022-11-23 13:52:28,710 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 13:52:28,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 102 treesize of output 92 [2022-11-23 13:52:29,242 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 13:52:29,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [987594564] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 13:52:29,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1043475458] [2022-11-23 13:52:29,245 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 13:52:29,245 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 13:52:29,245 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 13:52:29,246 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 13:52:29,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 13:52:29,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,293 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-23 13:52:29,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-23 13:52:29,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-23 13:52:29,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 13:52:29,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:29,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2022-11-23 13:52:29,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2022-11-23 13:52:29,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2022-11-23 13:52:29,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2022-11-23 13:52:29,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,440 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-11-23 13:52:29,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-11-23 13:52:29,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:29,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2022-11-23 13:52:29,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:29,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:29,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2022-11-23 13:52:29,858 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:29,867 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:29,879 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:29,882 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:29,883 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:29,886 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:29,888 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:30,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:30,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:30,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:30,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2022-11-23 13:52:30,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:30,220 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:30,223 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:30,225 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:30,226 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:30,228 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:30,321 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:30,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:30,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 221 treesize of output 205 [2022-11-23 13:52:30,340 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:30,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 219 treesize of output 207 [2022-11-23 13:52:30,356 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:30,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 227 treesize of output 110 [2022-11-23 13:52:30,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:30,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 124 [2022-11-23 13:52:30,547 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:30,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 124 [2022-11-23 13:52:30,557 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:30,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 116 [2022-11-23 13:52:30,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:30,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:30,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:30,927 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:30,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:30,957 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:30,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:30,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:30,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,018 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:31,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:31,055 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:31,056 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:31,088 INFO L321 Elim1Store]: treesize reduction 52, result has 34.2 percent of original size [2022-11-23 13:52:31,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 73 treesize of output 66 [2022-11-23 13:52:31,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,118 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 13:52:31,145 INFO L321 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2022-11-23 13:52:31,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 59 treesize of output 48 [2022-11-23 13:52:31,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:31,308 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:31,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:31,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,356 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:31,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:31,419 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:31,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:31,467 INFO L321 Elim1Store]: treesize reduction 41, result has 35.9 percent of original size [2022-11-23 13:52:31,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 57 [2022-11-23 13:52:31,477 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,497 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-23 13:52:31,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 53 treesize of output 39 [2022-11-23 13:52:31,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:31,714 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:31,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:31,735 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:31,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:31,744 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,774 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:31,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:31,830 INFO L321 Elim1Store]: treesize reduction 41, result has 35.9 percent of original size [2022-11-23 13:52:31,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 57 [2022-11-23 13:52:31,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:31,860 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-23 13:52:31,860 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 53 treesize of output 39 [2022-11-23 13:52:31,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:32,090 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:32,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:32,117 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:32,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:32,128 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:32,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:32,182 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:32,182 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:32,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 13:52:32,251 INFO L321 Elim1Store]: treesize reduction 41, result has 35.9 percent of original size [2022-11-23 13:52:32,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 57 [2022-11-23 13:52:32,277 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-23 13:52:32,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 53 treesize of output 39 [2022-11-23 13:52:32,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:32,543 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 67 for LOIs [2022-11-23 13:52:32,663 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 13:52:35,725 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '775#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0))) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~len~0#1|)) (<= 0 |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-23 13:52:35,725 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 13:52:35,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 13:52:35,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13] total 26 [2022-11-23 13:52:35,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991528829] [2022-11-23 13:52:35,726 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 13:52:35,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 13:52:35,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:35,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 13:52:35,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1415, Unknown=4, NotChecked=0, Total=1560 [2022-11-23 13:52:35,728 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 26 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 19 states have internal predecessors, (36), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 13:52:36,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:36,287 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2022-11-23 13:52:36,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 13:52:36,288 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 19 states have internal predecessors, (36), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2022-11-23 13:52:36,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:36,290 INFO L225 Difference]: With dead ends: 54 [2022-11-23 13:52:36,291 INFO L226 Difference]: Without dead ends: 41 [2022-11-23 13:52:36,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=185, Invalid=1791, Unknown=4, NotChecked=0, Total=1980 [2022-11-23 13:52:36,293 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 32 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:36,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 159 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 13:52:36,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-23 13:52:36,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2022-11-23 13:52:36,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 13:52:36,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2022-11-23 13:52:36,301 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 27 [2022-11-23 13:52:36,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:36,301 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2022-11-23 13:52:36,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 19 states have internal predecessors, (36), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 13:52:36,302 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2022-11-23 13:52:36,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-23 13:52:36,303 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:36,303 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:36,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-23 13:52:36,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:36,516 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:36,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:36,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1247974827, now seen corresponding path program 1 times [2022-11-23 13:52:36,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:36,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790086165] [2022-11-23 13:52:36,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:36,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:36,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:38,329 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 13:52:38,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:38,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790086165] [2022-11-23 13:52:38,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790086165] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:52:38,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882657768] [2022-11-23 13:52:38,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:38,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:38,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:52:38,331 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:52:38,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 13:52:38,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:38,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-23 13:52:38,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:52:38,881 INFO L321 Elim1Store]: treesize reduction 106, result has 24.8 percent of original size [2022-11-23 13:52:38,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 271 treesize of output 126 [2022-11-23 13:52:38,923 INFO L321 Elim1Store]: treesize reduction 78, result has 25.7 percent of original size [2022-11-23 13:52:38,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 170 treesize of output 89 [2022-11-23 13:52:39,289 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 13:52:39,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 13:52:39,643 INFO L321 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2022-11-23 13:52:39,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 175 treesize of output 1 [2022-11-23 13:52:39,652 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 13:52:39,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882657768] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 13:52:39,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [945059522] [2022-11-23 13:52:39,655 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 13:52:39,655 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 13:52:39,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 13:52:39,655 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 13:52:39,656 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 13:52:39,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,689 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-23 13:52:39,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-23 13:52:39,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-23 13:52:39,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:39,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 13:52:39,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,738 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2022-11-23 13:52:39,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2022-11-23 13:52:39,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2022-11-23 13:52:39,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-11-23 13:52:39,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2022-11-23 13:52:39,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-11-23 13:52:39,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:39,833 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2022-11-23 13:52:39,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:39,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:39,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:39,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:39,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:39,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:39,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:39,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:39,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,006 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:40,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-11-23 13:52:40,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-23 13:52:40,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-23 13:52:40,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:40,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:40,345 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,347 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,348 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,350 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,353 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:40,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,575 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:40,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:40,596 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,598 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,600 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,601 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,604 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:40,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-23 13:52:40,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:52:40,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-11-23 13:52:40,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-23 13:52:41,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:41,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:41,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:41,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:41,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:41,187 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,189 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,191 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,193 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,195 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,391 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,393 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,395 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,397 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,398 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-23 13:52:41,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:41,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:41,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:41,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 13:52:41,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 13:52:41,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-11-23 13:52:41,526 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-23 13:52:41,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2022-11-23 13:52:41,552 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-23 13:52:41,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2022-11-23 13:52:41,734 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:41,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:41,767 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:41,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:41,795 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:41,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:41,809 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:41,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:42,260 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:42,260 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:42,283 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:42,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:42,311 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:42,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:42,321 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:42,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:42,461 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:42,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 45 [2022-11-23 13:52:42,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:42,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:42,503 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-23 13:52:42,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-23 13:52:42,538 INFO L321 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2022-11-23 13:52:42,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 15 [2022-11-23 13:52:43,267 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 87 for LOIs [2022-11-23 13:52:43,431 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 13:52:50,091 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1144#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~new_head~0#1.offset|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 0))) (<= 0 |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset|) (<= |ULTIMATE.start_main_~data~0#1| 1) (<= 0 |#NULL.base|) (<= 2 |ULTIMATE.start_main_~len~0#1|) (<= 0 |ULTIMATE.start_sll_circular_remove_first_~head#1.offset|) (<= 0 |ULTIMATE.start_sll_circular_remove_first_~head#1.base|) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= 1 |ULTIMATE.start_sll_circular_create_~len#1|) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~len~0#1| 2) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_~new_head~0#1.offset| 0) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (<= 0 |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base|) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |#NULL.base| 0) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~len~0#1|)) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_sll_circular_remove_first_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= 1 |ULTIMATE.start_main_~data~0#1|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|))' at error location [2022-11-23 13:52:50,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 13:52:50,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 13:52:50,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8, 7] total 30 [2022-11-23 13:52:50,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314062469] [2022-11-23 13:52:50,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 13:52:50,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-23 13:52:50,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:50,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-23 13:52:50,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1745, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 13:52:50,094 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 30 states, 27 states have (on average 2.2222222222222223) internal successors, (60), 27 states have internal predecessors, (60), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-23 13:52:52,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:52,071 INFO L93 Difference]: Finished difference Result 89 states and 109 transitions. [2022-11-23 13:52:52,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-23 13:52:52,072 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.2222222222222223) internal successors, (60), 27 states have internal predecessors, (60), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 32 [2022-11-23 13:52:52,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:52,073 INFO L225 Difference]: With dead ends: 89 [2022-11-23 13:52:52,073 INFO L226 Difference]: Without dead ends: 76 [2022-11-23 13:52:52,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=345, Invalid=3561, Unknown=0, NotChecked=0, Total=3906 [2022-11-23 13:52:52,075 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 199 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:52,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 169 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 13:52:52,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-23 13:52:52,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 46. [2022-11-23 13:52:52,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 41 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 13:52:52,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2022-11-23 13:52:52,098 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 32 [2022-11-23 13:52:52,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:52,100 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2022-11-23 13:52:52,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.2222222222222223) internal successors, (60), 27 states have internal predecessors, (60), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-23 13:52:52,101 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2022-11-23 13:52:52,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-23 13:52:52,102 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:52,103 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:52,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-23 13:52:52,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:52,308 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:52,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:52,309 INFO L85 PathProgramCache]: Analyzing trace with hash -547947851, now seen corresponding path program 2 times [2022-11-23 13:52:52,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:52,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206840119] [2022-11-23 13:52:52,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:52,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:52,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:52,465 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-23 13:52:52,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:52,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206840119] [2022-11-23 13:52:52,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206840119] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:52:52,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140670928] [2022-11-23 13:52:52,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 13:52:52,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:52,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:52:52,467 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:52:52,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 13:52:52,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 13:52:52,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 13:52:52,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 13:52:52,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:52:52,663 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 13:52:52,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:52:52,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140670928] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:52:52,664 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:52:52,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 5 [2022-11-23 13:52:52,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462758431] [2022-11-23 13:52:52,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:52:52,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:52:52,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:52:52,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:52:52,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 13:52:52,666 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 13:52:52,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:52:52,699 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2022-11-23 13:52:52,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:52:52,700 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 33 [2022-11-23 13:52:52,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:52:52,700 INFO L225 Difference]: With dead ends: 78 [2022-11-23 13:52:52,701 INFO L226 Difference]: Without dead ends: 41 [2022-11-23 13:52:52,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 13:52:52,702 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 12 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 13:52:52,703 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 13:52:52,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-23 13:52:52,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-23 13:52:52,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 13:52:52,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2022-11-23 13:52:52,717 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 33 [2022-11-23 13:52:52,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:52:52,718 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2022-11-23 13:52:52,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 13:52:52,718 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2022-11-23 13:52:52,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 13:52:52,719 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:52:52,719 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:52:52,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 13:52:52,925 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:52,925 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:52:52,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:52:52,925 INFO L85 PathProgramCache]: Analyzing trace with hash 105671536, now seen corresponding path program 2 times [2022-11-23 13:52:52,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:52:52,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437973421] [2022-11-23 13:52:52,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:52:52,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:52:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:52:54,086 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 13:52:54,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:52:54,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437973421] [2022-11-23 13:52:54,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437973421] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:52:54,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149808647] [2022-11-23 13:52:54,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 13:52:54,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:52:54,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:52:54,088 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:52:54,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_991a676e-e0f6-445e-8f8f-0c8ad89f1583/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 13:52:55,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 13:52:55,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 13:52:55,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 103 conjunts are in the unsatisfiable core [2022-11-23 13:52:55,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:52:55,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 13:52:55,279 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-23 13:52:55,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-23 13:52:55,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:55,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 13:52:55,407 INFO L321 Elim1Store]: treesize reduction 33, result has 25.0 percent of original size [2022-11-23 13:52:55,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 45 [2022-11-23 13:52:55,418 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 13:52:55,822 INFO L321 Elim1Store]: treesize reduction 36, result has 18.2 percent of original size [2022-11-23 13:52:55,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 99 treesize of output 52 [2022-11-23 13:52:55,835 INFO L321 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2022-11-23 13:52:55,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 22 [2022-11-23 13:52:55,876 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 13:52:55,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 13:52:56,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 13:55:41,490 WARN L233 SmtUtils]: Spent 2.75m on a formula simplification. DAG size of input: 2031 DAG size of output: 957 (called from [L 318] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-11-23 13:55:41,495 INFO L321 Elim1Store]: treesize reduction 31822, result has 35.4 percent of original size [2022-11-23 13:55:41,497 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 35 select indices, 35 select index equivalence classes, 0 disjoint index pairs (out of 595 index pairs), introduced 51 new quantified variables, introduced 595 case distinctions, treesize of input 204941 treesize of output 163485 [2022-11-23 13:56:02,075 INFO L217 Elim1Store]: Index analysis took 130 ms