./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/heavy-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/heavy-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7 --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 544ff1a31d34f1c818140bb31fb5c7091aef904c3b9f7e17a0cc8560e99eb61a --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:01:46,522 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:01:46,524 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:01:46,568 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:01:46,568 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:01:46,572 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:01:46,574 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:01:46,577 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:01:46,579 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:01:46,584 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:01:46,585 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:01:46,587 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:01:46,587 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:01:46,590 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:01:46,592 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:01:46,596 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:01:46,598 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:01:46,599 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:01:46,601 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:01:46,609 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:01:46,611 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:01:46,612 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:01:46,615 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:01:46,615 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:01:46,624 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:01:46,624 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:01:46,625 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:01:46,627 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:01:46,627 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:01:46,629 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:01:46,629 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:01:46,630 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:01:46,632 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:01:46,633 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:01:46,634 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:01:46,635 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:01:46,635 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:01:46,635 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:01:46,636 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:01:46,637 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:01:46,637 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:01:46,638 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:01:46,676 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:01:46,676 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:01:46,677 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:01:46,677 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:01:46,678 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:01:46,678 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:01:46,678 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:01:46,678 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:01:46,678 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:01:46,679 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:01:46,679 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:01:46,679 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:01:46,679 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:01:46,680 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:01:46,680 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:01:46,680 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:01:46,680 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:01:46,681 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:01:46,681 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:01:46,681 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:01:46,682 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:01:46,682 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:01:46,682 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:01:46,682 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:01:46,683 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:01:46,683 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:01:46,683 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:01:46,683 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:01:46,683 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:01:46,684 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:01:46,684 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:01:46,684 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:01:46,684 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:01:46,685 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:01:46,685 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:01:46,685 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:01:46,685 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:01:46,686 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:01:46,686 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:01:46,686 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:01:46,686 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:01:46,686 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 544ff1a31d34f1c818140bb31fb5c7091aef904c3b9f7e17a0cc8560e99eb61a [2021-11-25 20:01:46,927 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:01:46,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:01:46,954 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:01:46,955 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:01:46,957 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:01:46,958 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/loops/heavy-1.c [2021-11-25 20:01:47,032 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/data/1b523f7de/a9a2cd416a034fb585ec14e4a99ebadf/FLAGba7d11eae [2021-11-25 20:01:47,573 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:01:47,574 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/sv-benchmarks/c/loops/heavy-1.c [2021-11-25 20:01:47,584 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/data/1b523f7de/a9a2cd416a034fb585ec14e4a99ebadf/FLAGba7d11eae [2021-11-25 20:01:47,932 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/data/1b523f7de/a9a2cd416a034fb585ec14e4a99ebadf [2021-11-25 20:01:47,934 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:01:47,936 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:01:47,938 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:01:47,938 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:01:47,953 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:01:47,954 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:01:47" (1/1) ... [2021-11-25 20:01:47,955 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27bc5a5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:47, skipping insertion in model container [2021-11-25 20:01:47,955 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:01:47" (1/1) ... [2021-11-25 20:01:47,961 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:01:47,973 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:01:48,139 WARN L230 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_df67b0db-78eb-432f-adf1-055ed8fb4486/sv-benchmarks/c/loops/heavy-1.c[600,613] [2021-11-25 20:01:48,143 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:01:48,193 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:01:48,208 WARN L230 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_df67b0db-78eb-432f-adf1-055ed8fb4486/sv-benchmarks/c/loops/heavy-1.c[600,613] [2021-11-25 20:01:48,209 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:01:48,262 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:01:48,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48 WrapperNode [2021-11-25 20:01:48,263 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:01:48,264 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:01:48,265 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:01:48,265 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:01:48,272 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,280 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,300 INFO L137 Inliner]: procedures = 12, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 60 [2021-11-25 20:01:48,301 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:01:48,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:01:48,301 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:01:48,302 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:01:48,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,322 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,330 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,334 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,338 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,341 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:01:48,342 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:01:48,342 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:01:48,342 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:01:48,346 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (1/1) ... [2021-11-25 20:01:48,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:01:48,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:48,377 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:01:48,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:01:48,413 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:01:48,413 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:01:48,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:01:48,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:01:48,414 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:01:48,414 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:01:48,414 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-25 20:01:48,496 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:01:48,498 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:01:48,643 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:01:48,667 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:01:48,667 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 20:01:48,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:01:48 BoogieIcfgContainer [2021-11-25 20:01:48,670 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:01:48,671 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:01:48,672 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:01:48,675 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:01:48,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:01:47" (1/3) ... [2021-11-25 20:01:48,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24c6e70d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:01:48, skipping insertion in model container [2021-11-25 20:01:48,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:01:48" (2/3) ... [2021-11-25 20:01:48,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24c6e70d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:01:48, skipping insertion in model container [2021-11-25 20:01:48,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:01:48" (3/3) ... [2021-11-25 20:01:48,678 INFO L111 eAbstractionObserver]: Analyzing ICFG heavy-1.c [2021-11-25 20:01:48,683 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:01:48,683 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:01:48,730 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:01:48,737 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:01:48,737 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:01:48,751 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:48,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 20:01:48,756 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:48,757 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 20:01:48,757 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:01:48,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:48,762 INFO L85 PathProgramCache]: Analyzing trace with hash 2496104, now seen corresponding path program 1 times [2021-11-25 20:01:48,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:01:48,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071710133] [2021-11-25 20:01:48,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:48,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:01:48,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:48,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:48,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:01:48,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071710133] [2021-11-25 20:01:48,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071710133] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:01:48,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:01:48,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:01:48,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236953179] [2021-11-25 20:01:48,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:01:48,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:01:48,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:01:48,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:01:48,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:01:48,961 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:49,001 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-11-25 20:01:49,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:01:49,004 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 20:01:49,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:49,011 INFO L225 Difference]: With dead ends: 17 [2021-11-25 20:01:49,012 INFO L226 Difference]: Without dead ends: 10 [2021-11-25 20:01:49,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:01:49,018 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 8 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 [2021-11-25 20:01:49,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 8 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:01:49,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-25 20:01:49,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 8. [2021-11-25 20:01:49,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2021-11-25 20:01:49,049 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 4 [2021-11-25 20:01:49,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:49,049 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2021-11-25 20:01:49,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,073 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2021-11-25 20:01:49,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:01:49,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:49,074 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 20:01:49,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:01:49,075 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:01:49,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:49,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1936420166, now seen corresponding path program 1 times [2021-11-25 20:01:49,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:01:49,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534221751] [2021-11-25 20:01:49,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:49,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:01:49,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:49,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:49,119 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:01:49,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534221751] [2021-11-25 20:01:49,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534221751] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:01:49,119 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:01:49,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:01:49,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479235334] [2021-11-25 20:01:49,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:01:49,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:01:49,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:01:49,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:01:49,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:01:49,123 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:49,145 INFO L93 Difference]: Finished difference Result 16 states and 22 transitions. [2021-11-25 20:01:49,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:01:49,146 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 20:01:49,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:49,146 INFO L225 Difference]: With dead ends: 16 [2021-11-25 20:01:49,147 INFO L226 Difference]: Without dead ends: 10 [2021-11-25 20:01:49,147 INFO L932 BasicCegarLoop]: 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 [2021-11-25 20:01:49,149 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:01:49,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 5 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:01:49,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-25 20:01:49,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2021-11-25 20:01:49,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-11-25 20:01:49,153 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-11-25 20:01:49,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:49,153 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-11-25 20:01:49,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,154 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-11-25 20:01:49,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:01:49,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:49,155 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:01:49,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:01:49,155 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:01:49,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:49,156 INFO L85 PathProgramCache]: Analyzing trace with hash 2032239394, now seen corresponding path program 1 times [2021-11-25 20:01:49,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:01:49,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572463073] [2021-11-25 20:01:49,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:49,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:01:49,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:49,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:49,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:01:49,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572463073] [2021-11-25 20:01:49,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572463073] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:01:49,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:01:49,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:01:49,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656645480] [2021-11-25 20:01:49,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:01:49,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:01:49,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:01:49,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:01:49,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:01:49,246 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:49,274 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2021-11-25 20:01:49,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:01:49,276 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 20:01:49,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:49,276 INFO L225 Difference]: With dead ends: 17 [2021-11-25 20:01:49,277 INFO L226 Difference]: Without dead ends: 10 [2021-11-25 20:01:49,278 INFO L932 BasicCegarLoop]: 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 [2021-11-25 20:01:49,279 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:01:49,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:01:49,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-25 20:01:49,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-25 20:01:49,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-25 20:01:49,289 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2021-11-25 20:01:49,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:49,290 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-25 20:01:49,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:49,291 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-25 20:01:49,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:01:49,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:49,292 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:01:49,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:01:49,298 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:01:49,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:49,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1594945054, now seen corresponding path program 1 times [2021-11-25 20:01:49,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:01:49,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523758468] [2021-11-25 20:01:49,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:49,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:01:49,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:49,467 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:49,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:01:49,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523758468] [2021-11-25 20:01:49,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523758468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:01:49,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969915091] [2021-11-25 20:01:49,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:49,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:49,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:49,478 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:01:49,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:01:49,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:49,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:01:49,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:49,610 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:01:49,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:49,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:01:49,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969915091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:49,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1779364215] [2021-11-25 20:01:49,670 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:01:49,670 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:01:49,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:01:49,680 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:01:49,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:01:49,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:01:49,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 122 [2021-11-25 20:01:50,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:01:50,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 531 treesize of output 509 [2021-11-25 20:01:51,099 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:01:51,146 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:01:51,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:01:51,474 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:51,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:51,814 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:51,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:52,121 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:52,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:52,295 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:01:52,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '205#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:01:52,451 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:01:52,451 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:01:52,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2021-11-25 20:01:52,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759662420] [2021-11-25 20:01:52,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:01:52,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:01:52,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:01:52,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:01:52,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:01:52,454 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:52,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:52,642 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2021-11-25 20:01:52,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:01:52,643 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:01:52,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:52,644 INFO L225 Difference]: With dead ends: 31 [2021-11-25 20:01:52,644 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 20:01:52,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:01:52,646 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:01:52,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 13 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:01:52,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 20:01:52,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 20:01:52,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:52,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-11-25 20:01:52,653 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 9 [2021-11-25 20:01:52,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:52,653 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-11-25 20:01:52,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:52,654 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-11-25 20:01:52,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 20:01:52,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:52,655 INFO L514 BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-25 20:01:52,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:01:52,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-25 20:01:52,882 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:01:52,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:52,883 INFO L85 PathProgramCache]: Analyzing trace with hash 1215888474, now seen corresponding path program 2 times [2021-11-25 20:01:52,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:01:52,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551842052] [2021-11-25 20:01:52,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:52,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:01:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:53,012 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 32 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:01:53,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:01:53,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551842052] [2021-11-25 20:01:53,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551842052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:01:53,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919919728] [2021-11-25 20:01:53,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:01:53,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:53,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:53,014 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:01:53,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:01:53,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:01:53,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:01:53,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:01:53,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:53,147 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-25 20:01:53,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:53,222 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-25 20:01:53,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1919919728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:53,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170123494] [2021-11-25 20:01:53,235 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:01:53,235 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:01:53,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:01:53,235 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:01:53,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:01:53,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:01:53,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 201 treesize of output 185 [2021-11-25 20:01:53,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:01:53,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 619 treesize of output 597 [2021-11-25 20:01:54,026 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:01:54,056 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:01:54,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:01:54,317 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:54,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:54,639 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:54,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:54,854 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:54,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:55,006 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:01:55,340 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '461#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:01:55,340 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:01:55,340 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:01:55,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 9 [2021-11-25 20:01:55,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982704284] [2021-11-25 20:01:55,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:01:55,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:01:55,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:01:55,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:01:55,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:01:55,342 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:55,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:55,664 INFO L93 Difference]: Finished difference Result 114 states and 158 transitions. [2021-11-25 20:01:55,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 20:01:55,665 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 20:01:55,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:55,666 INFO L225 Difference]: With dead ends: 114 [2021-11-25 20:01:55,666 INFO L226 Difference]: Without dead ends: 93 [2021-11-25 20:01:55,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=151, Invalid=499, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:01:55,668 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:01:55,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 21 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:01:55,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-25 20:01:55,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-11-25 20:01:55,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2282608695652173) internal successors, (113), 92 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:55,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 113 transitions. [2021-11-25 20:01:55,697 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 113 transitions. Word has length 22 [2021-11-25 20:01:55,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:55,697 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 113 transitions. [2021-11-25 20:01:55,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:55,698 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 113 transitions. [2021-11-25 20:01:55,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 20:01:55,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:55,704 INFO L514 BasicCegarLoop]: trace histogram [48, 16, 16, 4, 4, 1, 1, 1, 1] [2021-11-25 20:01:55,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:01:55,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:55,918 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:01:55,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:55,918 INFO L85 PathProgramCache]: Analyzing trace with hash -419899728, now seen corresponding path program 3 times [2021-11-25 20:01:55,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:01:55,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884854500] [2021-11-25 20:01:55,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:55,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:01:56,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:56,382 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 263 proven. 6 refuted. 0 times theorem prover too weak. 1947 trivial. 0 not checked. [2021-11-25 20:01:56,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:01:56,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884854500] [2021-11-25 20:01:56,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884854500] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:01:56,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958604419] [2021-11-25 20:01:56,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:01:56,383 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:56,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:56,384 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:01:56,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:01:56,601 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:01:56,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:01:56,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:01:56,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:56,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 263 proven. 6 refuted. 0 times theorem prover too weak. 1947 trivial. 0 not checked. [2021-11-25 20:01:56,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:57,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 695 proven. 57 refuted. 0 times theorem prover too weak. 1464 trivial. 0 not checked. [2021-11-25 20:01:57,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958604419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:57,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247231284] [2021-11-25 20:01:57,150 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:01:57,151 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:01:57,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:01:57,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:01:57,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:01:57,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:01:57,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 122 [2021-11-25 20:01:57,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:01:57,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 531 treesize of output 509 [2021-11-25 20:01:57,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:01:57,890 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:01:57,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:01:58,102 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:58,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:58,342 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:58,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:58,578 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:01:58,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:01:58,751 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:01:59,421 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1462#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:01:59,421 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:01:59,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:01:59,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 9] total 18 [2021-11-25 20:01:59,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131931267] [2021-11-25 20:01:59,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:01:59,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 20:01:59,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:01:59,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 20:01:59,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:01:59,424 INFO L87 Difference]: Start difference. First operand 93 states and 113 transitions. Second operand has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:01,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:02:01,238 INFO L93 Difference]: Finished difference Result 417 states and 628 transitions. [2021-11-25 20:02:01,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 20:02:01,239 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-25 20:02:01,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:02:01,244 INFO L225 Difference]: With dead ends: 417 [2021-11-25 20:02:01,244 INFO L226 Difference]: Without dead ends: 331 [2021-11-25 20:02:01,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 241 SyntacticMatches, 20 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=443, Invalid=1719, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:02:01,247 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 29 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:02:01,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 22 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:02:01,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-11-25 20:02:01,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 257. [2021-11-25 20:02:01,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 256 states have (on average 1.34765625) internal successors, (345), 256 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:01,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 345 transitions. [2021-11-25 20:02:01,304 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 345 transitions. Word has length 92 [2021-11-25 20:02:01,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:02:01,305 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 345 transitions. [2021-11-25 20:02:01,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:01,305 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 345 transitions. [2021-11-25 20:02:01,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 20:02:01,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:02:01,309 INFO L514 BasicCegarLoop]: trace histogram [80, 16, 16, 4, 4, 1, 1, 1, 1] [2021-11-25 20:02:01,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:02:01,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:01,534 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:02:01,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:02:01,534 INFO L85 PathProgramCache]: Analyzing trace with hash -228308688, now seen corresponding path program 4 times [2021-11-25 20:02:01,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:02:01,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297911304] [2021-11-25 20:02:01,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:02:01,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:02:01,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:02:01,980 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 806 proven. 36 refuted. 0 times theorem prover too weak. 3918 trivial. 0 not checked. [2021-11-25 20:02:01,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:02:01,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297911304] [2021-11-25 20:02:01,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297911304] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:02:01,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809368548] [2021-11-25 20:02:01,981 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:02:01,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:01,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:02:01,982 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:02:02,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:02:02,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:02:02,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:02:02,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:02:02,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 1208 proven. 60 refuted. 0 times theorem prover too weak. 3492 trivial. 0 not checked. [2021-11-25 20:02:02,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:02:02,737 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 1233 proven. 10 refuted. 0 times theorem prover too weak. 3517 trivial. 0 not checked. [2021-11-25 20:02:02,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809368548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:02:02,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645111039] [2021-11-25 20:02:02,739 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:02:02,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:02:02,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:02:02,740 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:02:02,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:02:02,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:02:02,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 122 [2021-11-25 20:02:03,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:02:03,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 531 treesize of output 509 [2021-11-25 20:02:03,414 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:02:03,443 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:02:03,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:02:03,683 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:02:03,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:02:03,891 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:02:03,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:02:04,049 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:02:04,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3607#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:02:04,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:02:04,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:02:04,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 16 [2021-11-25 20:02:04,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847750822] [2021-11-25 20:02:04,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:02:04,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:02:04,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:02:04,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:02:04,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=252, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:02:04,569 INFO L87 Difference]: Start difference. First operand 257 states and 345 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:04,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:02:04,927 INFO L93 Difference]: Finished difference Result 514 states and 765 transitions. [2021-11-25 20:02:04,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:02:04,928 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2021-11-25 20:02:04,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:02:04,930 INFO L225 Difference]: With dead ends: 514 [2021-11-25 20:02:04,930 INFO L226 Difference]: Without dead ends: 269 [2021-11-25 20:02:04,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 342 SyntacticMatches, 22 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:02:04,933 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:02:04,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:02:04,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-25 20:02:04,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2021-11-25 20:02:04,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.078358208955224) internal successors, (289), 268 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:04,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 289 transitions. [2021-11-25 20:02:04,991 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 289 transitions. Word has length 124 [2021-11-25 20:02:04,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:02:04,991 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 289 transitions. [2021-11-25 20:02:04,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:04,992 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 289 transitions. [2021-11-25 20:02:04,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-25 20:02:04,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:02:04,998 INFO L514 BasicCegarLoop]: trace histogram [224, 16, 16, 4, 4, 1, 1, 1, 1] [2021-11-25 20:02:05,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:02:05,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:05,226 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:02:05,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:02:05,226 INFO L85 PathProgramCache]: Analyzing trace with hash 1070396208, now seen corresponding path program 5 times [2021-11-25 20:02:05,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:02:05,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409756401] [2021-11-25 20:02:05,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:02:05,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:02:06,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:02:06,731 INFO L134 CoverageAnalysis]: Checked inductivity of 28880 backedges. 3398 proven. 105 refuted. 0 times theorem prover too weak. 25377 trivial. 0 not checked. [2021-11-25 20:02:06,731 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:02:06,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409756401] [2021-11-25 20:02:06,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409756401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:02:06,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406851443] [2021-11-25 20:02:06,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:02:06,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:02:06,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:02:06,734 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:02:06,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:02:25,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-25 20:02:25,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:02:25,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 20:02:25,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:02:26,306 INFO L134 CoverageAnalysis]: Checked inductivity of 28880 backedges. 3398 proven. 105 refuted. 0 times theorem prover too weak. 25377 trivial. 0 not checked. [2021-11-25 20:02:26,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:02:28,015 INFO L134 CoverageAnalysis]: Checked inductivity of 28880 backedges. 3398 proven. 105 refuted. 0 times theorem prover too weak. 25377 trivial. 0 not checked. [2021-11-25 20:02:28,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406851443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:02:28,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495467063] [2021-11-25 20:02:28,018 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:02:28,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:02:28,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:02:28,019 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:02:28,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:02:28,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:02:28,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 201 treesize of output 185 [2021-11-25 20:02:28,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:02:28,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 619 treesize of output 597 [2021-11-25 20:02:28,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:02:28,666 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:02:28,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:02:28,846 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:02:28,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:02:29,051 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:02:29,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:02:29,201 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:02:29,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:02:29,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:02:29,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6811#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:02:29,904 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:02:29,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:02:29,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2021-11-25 20:02:29,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921800324] [2021-11-25 20:02:29,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:02:29,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:02:29,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:02:29,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:02:29,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=1003, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:02:29,907 INFO L87 Difference]: Start difference. First operand 269 states and 289 transitions. Second operand has 33 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:29,188 WARN L227 SmtUtils]: Spent 26.97s on a formula simplification that was a NOOP. DAG size: 89 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:03:31,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:03:31,156 INFO L93 Difference]: Finished difference Result 776 states and 1071 transitions. [2021-11-25 20:03:31,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-25 20:03:31,160 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2021-11-25 20:03:31,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:03:31,163 INFO L225 Difference]: With dead ends: 776 [2021-11-25 20:03:31,163 INFO L226 Difference]: Without dead ends: 525 [2021-11-25 20:03:31,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 784 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 60.9s TimeCoverageRelationStatistics Valid=824, Invalid=1828, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 20:03:31,166 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 70 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:03:31,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 60 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 20:03:31,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-11-25 20:03:31,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 525. [2021-11-25 20:03:31,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 524 states have (on average 1.0400763358778626) internal successors, (545), 524 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:31,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 545 transitions. [2021-11-25 20:03:31,217 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 545 transitions. Word has length 268 [2021-11-25 20:03:31,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:03:31,217 INFO L470 AbstractCegarLoop]: Abstraction has 525 states and 545 transitions. [2021-11-25 20:03:31,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:31,218 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 545 transitions. [2021-11-25 20:03:31,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 525 [2021-11-25 20:03:31,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:03:31,230 INFO L514 BasicCegarLoop]: trace histogram [480, 16, 16, 4, 4, 1, 1, 1, 1] [2021-11-25 20:03:31,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:03:31,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:03:31,437 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:03:31,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:03:31,437 INFO L85 PathProgramCache]: Analyzing trace with hash 2093093680, now seen corresponding path program 6 times [2021-11-25 20:03:31,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:03:31,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217518438] [2021-11-25 20:03:31,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:03:31,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:03:34,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:03:35,210 INFO L134 CoverageAnalysis]: Checked inductivity of 122960 backedges. 14438 proven. 465 refuted. 0 times theorem prover too weak. 108057 trivial. 0 not checked. [2021-11-25 20:03:35,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:03:35,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217518438] [2021-11-25 20:03:35,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217518438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:03:35,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400719964] [2021-11-25 20:03:35,211 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:03:35,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:03:35,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:03:35,213 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:03:35,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:03:36,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:03:36,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:03:36,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 3536 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:03:36,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:37,535 INFO L134 CoverageAnalysis]: Checked inductivity of 122960 backedges. 46207 proven. 5916 refuted. 0 times theorem prover too weak. 70837 trivial. 0 not checked. [2021-11-25 20:03:37,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:38,928 INFO L134 CoverageAnalysis]: Checked inductivity of 122960 backedges. 46337 proven. 5786 refuted. 0 times theorem prover too weak. 70837 trivial. 0 not checked. [2021-11-25 20:03:38,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400719964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:38,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96875601] [2021-11-25 20:03:38,931 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:03:38,932 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:03:38,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:03:38,932 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:03:38,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:03:38,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:03:39,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 122 [2021-11-25 20:03:39,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:03:39,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 531 treesize of output 509 [2021-11-25 20:03:39,552 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:03:39,577 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:03:39,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:03:39,830 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:03:39,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:03:40,033 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:03:40,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:03:40,174 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:03:41,761 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12631#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:03:41,761 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:03:41,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:03:41,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12, 12] total 53 [2021-11-25 20:03:41,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445312810] [2021-11-25 20:03:41,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:03:41,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 20:03:41,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:03:41,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 20:03:41,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=2819, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:03:41,766 INFO L87 Difference]: Start difference. First operand 525 states and 545 transitions. Second operand has 53 states, 53 states have (on average 1.509433962264151) internal successors, (80), 53 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:04:14,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:04:14,664 INFO L93 Difference]: Finished difference Result 1824 states and 1951 transitions. [2021-11-25 20:04:14,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 327 states. [2021-11-25 20:04:14,665 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.509433962264151) internal successors, (80), 53 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 524 [2021-11-25 20:04:14,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:04:14,673 INFO L225 Difference]: With dead ends: 1824 [2021-11-25 20:04:14,673 INFO L226 Difference]: Without dead ends: 1333 [2021-11-25 20:04:14,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1916 GetRequests, 1529 SyntacticMatches, 20 SemanticMatches, 367 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52675 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=7961, Invalid=127831, Unknown=0, NotChecked=0, Total=135792 [2021-11-25 20:04:14,696 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 39 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 5850 mSolverCounterSat, 831 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 6681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 831 IncrementalHoareTripleChecker+Valid, 5850 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:04:14,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 58 Invalid, 6681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [831 Valid, 5850 Invalid, 0 Unknown, 0 Unchecked, 7.6s Time] [2021-11-25 20:04:14,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1333 states. [2021-11-25 20:04:14,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1333 to 1333. [2021-11-25 20:04:14,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1333 states, 1332 states have (on average 1.0337837837837838) internal successors, (1377), 1332 states have internal predecessors, (1377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:04:14,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1333 states to 1333 states and 1377 transitions. [2021-11-25 20:04:14,814 INFO L78 Accepts]: Start accepts. Automaton has 1333 states and 1377 transitions. Word has length 524 [2021-11-25 20:04:14,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:04:14,816 INFO L470 AbstractCegarLoop]: Abstraction has 1333 states and 1377 transitions. [2021-11-25 20:04:14,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.509433962264151) internal successors, (80), 53 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:04:14,817 INFO L276 IsEmpty]: Start isEmpty. Operand 1333 states and 1377 transitions. [2021-11-25 20:04:14,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2021-11-25 20:04:14,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:04:14,901 INFO L514 BasicCegarLoop]: trace histogram [1240, 40, 40, 4, 4, 1, 1, 1, 1] [2021-11-25 20:04:14,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:04:15,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 20:04:15,126 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:04:15,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:04:15,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1380387248, now seen corresponding path program 7 times [2021-11-25 20:04:15,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:04:15,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665210029] [2021-11-25 20:04:15,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:04:15,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:04:24,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:04:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 819516 backedges. 39983 proven. 496 refuted. 0 times theorem prover too weak. 779037 trivial. 0 not checked. [2021-11-25 20:04:26,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:04:26,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665210029] [2021-11-25 20:04:26,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [665210029] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:04:26,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425724045] [2021-11-25 20:04:26,987 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:04:26,988 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:04:26,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:04:26,988 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:04:26,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:04:29,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:04:29,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 9000 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:04:29,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:32,290 INFO L134 CoverageAnalysis]: Checked inductivity of 819516 backedges. 0 proven. 616721 refuted. 0 times theorem prover too weak. 202795 trivial. 0 not checked. [2021-11-25 20:04:32,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 819516 backedges. 1575 proven. 615146 refuted. 0 times theorem prover too weak. 202795 trivial. 0 not checked. [2021-11-25 20:04:35,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425724045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:35,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184396160] [2021-11-25 20:04:35,405 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:04:35,405 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:04:35,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:04:35,406 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:04:35,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:04:35,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:04:35,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 122 [2021-11-25 20:04:35,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:04:35,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 531 treesize of output 509 [2021-11-25 20:04:36,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:04:36,059 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:04:36,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:04:36,311 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:04:36,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:04:36,510 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:04:36,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:04:36,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:04:39,762 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27606#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:04:39,762 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:04:39,762 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:04:39,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 11, 11] total 54 [2021-11-25 20:04:39,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146828681] [2021-11-25 20:04:39,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:04:39,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 20:04:39,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:04:39,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 20:04:39,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2928, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:04:39,768 INFO L87 Difference]: Start difference. First operand 1333 states and 1377 transitions. Second operand has 54 states, 54 states have (on average 1.8333333333333333) internal successors, (99), 54 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:05:14,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:05:14,200 INFO L93 Difference]: Finished difference Result 4723 states and 4982 transitions. [2021-11-25 20:05:14,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 336 states. [2021-11-25 20:05:14,200 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.8333333333333333) internal successors, (99), 54 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1332 [2021-11-25 20:05:14,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:05:14,218 INFO L225 Difference]: With dead ends: 4723 [2021-11-25 20:05:14,218 INFO L226 Difference]: Without dead ends: 3425 [2021-11-25 20:05:14,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4355 GetRequests, 3933 SyntacticMatches, 44 SemanticMatches, 378 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56364 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=8213, Invalid=135807, Unknown=0, NotChecked=0, Total=144020 [2021-11-25 20:05:14,234 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 115 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 6365 mSolverCounterSat, 819 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 7184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 819 IncrementalHoareTripleChecker+Valid, 6365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:05:14,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 83 Invalid, 7184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [819 Valid, 6365 Invalid, 0 Unknown, 0 Unchecked, 8.4s Time] [2021-11-25 20:05:14,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3425 states. [2021-11-25 20:05:14,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3425 to 3425. [2021-11-25 20:05:14,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3425 states, 3424 states have (on average 1.0324182242990654) internal successors, (3535), 3424 states have internal predecessors, (3535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:05:14,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3425 states to 3425 states and 3535 transitions. [2021-11-25 20:05:14,579 INFO L78 Accepts]: Start accepts. Automaton has 3425 states and 3535 transitions. Word has length 1332 [2021-11-25 20:05:14,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:05:14,579 INFO L470 AbstractCegarLoop]: Abstraction has 3425 states and 3535 transitions. [2021-11-25 20:05:14,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.8333333333333333) internal successors, (99), 54 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:05:14,580 INFO L276 IsEmpty]: Start isEmpty. Operand 3425 states and 3535 transitions. [2021-11-25 20:05:14,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3425 [2021-11-25 20:05:14,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:05:14,660 INFO L514 BasicCegarLoop]: trace histogram [3200, 100, 100, 10, 10, 1, 1, 1, 1] [2021-11-25 20:05:14,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:05:14,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:05:14,873 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:05:14,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:05:14,874 INFO L85 PathProgramCache]: Analyzing trace with hash -311980356, now seen corresponding path program 8 times [2021-11-25 20:05:14,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:05:14,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259203580] [2021-11-25 20:05:14,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:05:14,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:06:21,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:06:31,935 INFO L134 CoverageAnalysis]: Checked inductivity of 5449400 backedges. 107930 proven. 528 refuted. 0 times theorem prover too weak. 5340942 trivial. 0 not checked. [2021-11-25 20:06:31,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:06:31,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259203580] [2021-11-25 20:06:31,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259203580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:06:31,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580059192] [2021-11-25 20:06:31,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:06:31,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:06:31,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:06:31,942 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:06:31,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df67b0db-78eb-432f-adf1-055ed8fb4486/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:08:11,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-11-25 20:08:11,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:08:11,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-25 20:08:11,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:08:15,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5449400 backedges. 107930 proven. 528 refuted. 0 times theorem prover too weak. 5340942 trivial. 0 not checked. [2021-11-25 20:08:15,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:08:20,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5449400 backedges. 107930 proven. 528 refuted. 0 times theorem prover too weak. 5340942 trivial. 0 not checked. [2021-11-25 20:08:20,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580059192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:08:20,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668441616] [2021-11-25 20:08:20,718 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:08:20,718 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:08:20,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:08:20,718 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:08:20,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:08:20,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 25 [2021-11-25 20:08:20,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 122 [2021-11-25 20:08:21,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:08:21,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 531 treesize of output 509 [2021-11-25 20:08:21,293 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:08:21,315 INFO L354 Elim1Store]: treesize reduction 96, result has 52.2 percent of original size [2021-11-25 20:08:21,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 146 [2021-11-25 20:08:21,446 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:08:21,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:08:21,649 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:08:21,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:08:21,866 INFO L354 Elim1Store]: treesize reduction 176, result has 47.1 percent of original size [2021-11-25 20:08:21,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 177 treesize of output 198 [2021-11-25 20:08:21,987 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:08:30,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65154#(and (= |ULTIMATE.start_main_~a~0#1| 1) (<= 1048576 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |~#array~0.offset| 0) (= 4 |~#array~0.base|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:08:30,211 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:08:30,211 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:08:30,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2021-11-25 20:08:30,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18610247] [2021-11-25 20:08:30,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:08:30,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-25 20:08:30,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:08:30,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-25 20:08:30,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1298, Invalid=3814, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 20:08:30,220 INFO L87 Difference]: Start difference. First operand 3425 states and 3535 transitions. Second operand has 69 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:08:53,574 WARN L227 SmtUtils]: Spent 6.18s on a formula simplification. DAG size of input: 134 DAG size of output: 10 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:08:55,589 WARN L838 $PredicateComparison]: unable to prove that (and (< (mod (+ 7 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 4) 4294967296) 1048576) (< (mod (+ 9 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 1) 4294967296) 1048576) (< (mod (+ 3 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ 14 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 18) 4294967296) 1048576) (< (mod (+ 23 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ 19 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 28) 4294967296) 1048576) (< (mod (+ 30 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 15) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 17) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 12) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 25) 4294967296) 1048576) (< (mod (+ 2 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 13) 4294967296) 1048576) (< (mod (+ 21 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ 29 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 11) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 27) 4294967296) 1048576) (< (mod (+ 5 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ 6 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 24) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 10) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 8) 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 20) 4294967296) 1048576) (< (mod (+ 22 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod |c_ULTIMATE.start_main_~k~0#1| 4294967296) 1048576) (< (mod (+ |c_ULTIMATE.start_main_~k~0#1| 26) 4294967296) 1048576) (< (mod (+ 16 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576) (< (mod (+ 31 |c_ULTIMATE.start_main_~k~0#1|) 4294967296) 1048576)) is different from false