./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m5.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_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/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_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/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_7fc944f4-fcd6-4970-9d60-c894977fa3bb/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 afdb8b285c2183da613babde617c7580c3aee6b3bc694b080468400e828cda16 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:20:38,507 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:20:38,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:20:38,562 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:20:38,563 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:20:38,567 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:20:38,569 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:20:38,573 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:20:38,575 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:20:38,580 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:20:38,581 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:20:38,583 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:20:38,584 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:20:38,586 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:20:38,588 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:20:38,592 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:20:38,594 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:20:38,595 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:20:38,600 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:20:38,608 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:20:38,610 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:20:38,611 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:20:38,614 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:20:38,615 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:20:38,624 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:20:38,625 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:20:38,625 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:20:38,627 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:20:38,627 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:20:38,629 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:20:38,629 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:20:38,630 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:20:38,632 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:20:38,633 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:20:38,634 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:20:38,634 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:20:38,635 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:20:38,635 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:20:38,636 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:20:38,636 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:20:38,637 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:20:38,638 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:20:38,679 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:20:38,679 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:20:38,679 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:20:38,679 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:20:38,680 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:20:38,680 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:20:38,681 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:20:38,681 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:20:38,681 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:20:38,681 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:20:38,682 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:20:38,682 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:20:38,682 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:20:38,682 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:20:38,683 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:20:38,683 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:20:38,683 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:20:38,683 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:20:38,684 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:20:38,684 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:20:38,684 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:20:38,685 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:20:38,685 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:20:38,685 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:20:38,685 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:20:38,686 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:20:38,686 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:20:38,686 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:20:38,686 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:20:38,687 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:20:38,687 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:20:38,687 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:20:38,687 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:20:38,688 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:20:38,688 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:20:38,688 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:20:38,688 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:20:38,688 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:20:38,689 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:20:38,689 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:20:38,689 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:20:38,689 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_7fc944f4-fcd6-4970-9d60-c894977fa3bb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afdb8b285c2183da613babde617c7580c3aee6b3bc694b080468400e828cda16 [2021-11-25 20:20:38,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:20:38,929 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:20:38,931 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:20:38,932 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:20:38,933 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:20:38,934 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-crafted/zero_sum_m5.c [2021-11-25 20:20:39,009 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/data/a77c9d53a/898c4f77c1244d9a9092213fb171cc82/FLAG09c1036ea [2021-11-25 20:20:39,493 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:20:39,494 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/sv-benchmarks/c/array-crafted/zero_sum_m5.c [2021-11-25 20:20:39,500 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/data/a77c9d53a/898c4f77c1244d9a9092213fb171cc82/FLAG09c1036ea [2021-11-25 20:20:39,955 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/data/a77c9d53a/898c4f77c1244d9a9092213fb171cc82 [2021-11-25 20:20:39,958 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:20:39,959 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:20:39,965 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:20:39,965 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:20:39,968 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:20:39,968 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:20:39" (1/1) ... [2021-11-25 20:20:39,969 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d12c44a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:39, skipping insertion in model container [2021-11-25 20:20:39,969 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:20:39" (1/1) ... [2021-11-25 20:20:39,976 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:20:39,991 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:20:40,164 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_7fc944f4-fcd6-4970-9d60-c894977fa3bb/sv-benchmarks/c/array-crafted/zero_sum_m5.c[402,415] [2021-11-25 20:20:40,213 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:20:40,220 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:20:40,232 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_7fc944f4-fcd6-4970-9d60-c894977fa3bb/sv-benchmarks/c/array-crafted/zero_sum_m5.c[402,415] [2021-11-25 20:20:40,243 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:20:40,255 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:20:40,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40 WrapperNode [2021-11-25 20:20:40,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:20:40,257 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:20:40,257 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:20:40,258 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:20:40,263 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,270 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,293 INFO L137 Inliner]: procedures = 15, calls = 21, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 149 [2021-11-25 20:20:40,294 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:20:40,296 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:20:40,303 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:20:40,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:20:40,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,311 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,316 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,316 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,323 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,329 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,331 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,333 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:20:40,334 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:20:40,334 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:20:40,335 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:20:40,335 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (1/1) ... [2021-11-25 20:20:40,343 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:20:40,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:40,364 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:20:40,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:20:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:20:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:20:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:20:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:20:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:20:40,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:20:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:20:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:20:40,459 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:20:40,460 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:20:40,629 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:20:40,691 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:20:40,691 INFO L301 CfgBuilder]: Removed 11 assume(true) statements. [2021-11-25 20:20:40,693 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:20:40 BoogieIcfgContainer [2021-11-25 20:20:40,693 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:20:40,695 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:20:40,695 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:20:40,698 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:20:40,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:20:39" (1/3) ... [2021-11-25 20:20:40,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71918c9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:20:40, skipping insertion in model container [2021-11-25 20:20:40,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:20:40" (2/3) ... [2021-11-25 20:20:40,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71918c9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:20:40, skipping insertion in model container [2021-11-25 20:20:40,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:20:40" (3/3) ... [2021-11-25 20:20:40,701 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_m5.c [2021-11-25 20:20:40,705 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:20:40,706 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:20:40,750 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:20:40,757 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 20:20:40,758 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:20:40,771 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 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 20:20:40,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:20:40,777 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:40,777 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:40,778 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:40,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:40,783 INFO L85 PathProgramCache]: Analyzing trace with hash 736515381, now seen corresponding path program 1 times [2021-11-25 20:20:40,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:40,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237133689] [2021-11-25 20:20:40,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:40,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:40,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:41,025 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 20:20:41,031 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:41,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237133689] [2021-11-25 20:20:41,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237133689] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:20:41,032 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:20:41,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:20:41,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256479716] [2021-11-25 20:20:41,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:20:41,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:20:41,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:41,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:20:41,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:20:41,085 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 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) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 20:20:41,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:41,192 INFO L93 Difference]: Finished difference Result 36 states and 59 transitions. [2021-11-25 20:20:41,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:20:41,195 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 15 [2021-11-25 20:20:41,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:41,203 INFO L225 Difference]: With dead ends: 36 [2021-11-25 20:20:41,203 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 20:20:41,207 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 20:20:41,211 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:41,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:20:41,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 20:20:41,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-25 20:20:41,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 20:20:41,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2021-11-25 20:20:41,249 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 15 [2021-11-25 20:20:41,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:41,250 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2021-11-25 20:20:41,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 20:20:41,252 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2021-11-25 20:20:41,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 20:20:41,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:41,253 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:41,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:20:41,255 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:41,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:41,259 INFO L85 PathProgramCache]: Analyzing trace with hash -1473336354, now seen corresponding path program 1 times [2021-11-25 20:20:41,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:41,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213240590] [2021-11-25 20:20:41,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:41,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:41,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:41,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:20:41,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:41,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213240590] [2021-11-25 20:20:41,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213240590] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:20:41,380 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:20:41,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:20:41,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093843899] [2021-11-25 20:20:41,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:20:41,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:20:41,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:41,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:20:41,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:20:41,386 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 20:20:41,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:41,505 INFO L93 Difference]: Finished difference Result 39 states and 67 transitions. [2021-11-25 20:20:41,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:20:41,506 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 16 [2021-11-25 20:20:41,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:41,507 INFO L225 Difference]: With dead ends: 39 [2021-11-25 20:20:41,507 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 20:20:41,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:20:41,509 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:41,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 5 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:20:41,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 20:20:41,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-25 20:20:41,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 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 20:20:41,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-25 20:20:41,519 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 16 [2021-11-25 20:20:41,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:41,519 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-25 20:20:41,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 20:20:41,520 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-25 20:20:41,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:20:41,521 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:41,521 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:41,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:20:41,521 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:41,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:41,522 INFO L85 PathProgramCache]: Analyzing trace with hash 479326558, now seen corresponding path program 1 times [2021-11-25 20:20:41,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:41,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045858170] [2021-11-25 20:20:41,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:41,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:41,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:41,634 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:20:41,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:41,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045858170] [2021-11-25 20:20:41,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045858170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:41,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028762116] [2021-11-25 20:20:41,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:41,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:41,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:41,638 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:41,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:20:41,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:41,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:20:41,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:41,847 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:20:41,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:41,921 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:20:41,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028762116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:41,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503695493] [2021-11-25 20:20:41,941 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:20:41,941 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:41,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:41,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:41,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:42,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:42,081 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:20:42,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:20:42,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:42,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:20:42,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:42,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:20:42,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:42,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:42,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:42,354 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:20:42,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:20:42,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:20:42,936 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:43,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '394#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:43,142 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:43,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:43,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 20:20:43,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540844561] [2021-11-25 20:20:43,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:43,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:20:43,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:43,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:20:43,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:20:43,145 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 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 20:20:43,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:43,199 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2021-11-25 20:20:43,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:20:43,200 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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 26 [2021-11-25 20:20:43,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:43,201 INFO L225 Difference]: With dead ends: 51 [2021-11-25 20:20:43,201 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 20:20:43,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:20:43,203 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:43,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:20:43,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 20:20:43,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 20:20:43,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 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 20:20:43,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-25 20:20:43,209 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 26 [2021-11-25 20:20:43,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:43,210 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-25 20:20:43,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 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 20:20:43,210 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-25 20:20:43,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 20:20:43,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:43,211 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:43,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:43,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:43,427 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:43,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:43,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1696466709, now seen corresponding path program 2 times [2021-11-25 20:20:43,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:43,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309828635] [2021-11-25 20:20:43,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:43,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:43,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:43,533 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:20:43,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:43,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309828635] [2021-11-25 20:20:43,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309828635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:43,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787994528] [2021-11-25 20:20:43,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:20:43,537 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:43,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:43,538 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:43,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:20:43,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:20:43,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:43,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:20:43,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:43,739 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:20:43,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:43,818 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:20:43,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787994528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:43,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1316590050] [2021-11-25 20:20:43,836 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:20:43,836 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:43,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:43,837 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:43,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:43,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:43,905 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:20:43,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:20:43,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:43,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:20:43,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:43,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:20:44,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:44,039 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:20:44,063 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:20:44,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:20:44,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:20:44,520 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:44,689 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '708#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:44,689 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:44,690 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:44,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-25 20:20:44,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763187037] [2021-11-25 20:20:44,690 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:44,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:20:44,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:44,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:20:44,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:20:44,692 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 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 20:20:44,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:44,787 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2021-11-25 20:20:44,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:20:44,788 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 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 27 [2021-11-25 20:20:44,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:44,789 INFO L225 Difference]: With dead ends: 59 [2021-11-25 20:20:44,789 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:20:44,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:20:44,791 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:44,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 9 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:20:44,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:20:44,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-25 20:20:44,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 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 20:20:44,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2021-11-25 20:20:44,797 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 27 [2021-11-25 20:20:44,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:44,798 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2021-11-25 20:20:44,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 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 20:20:44,798 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2021-11-25 20:20:44,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 20:20:44,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:44,799 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:44,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:45,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:45,000 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:45,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:45,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1441672107, now seen corresponding path program 3 times [2021-11-25 20:20:45,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:45,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335149513] [2021-11-25 20:20:45,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:45,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:45,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:47,139 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:47,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:47,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335149513] [2021-11-25 20:20:47,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335149513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:47,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831945028] [2021-11-25 20:20:47,140 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:20:47,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:47,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:47,149 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:47,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:20:47,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:20:47,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:47,233 WARN L261 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-25 20:20:47,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:48,284 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:20:48,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:50,014 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-25 20:20:50,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 52 [2021-11-25 20:20:50,116 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-25 20:20:50,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 17 [2021-11-25 20:20:50,193 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:20:50,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831945028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:50,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [25629554] [2021-11-25 20:20:50,196 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:20:50,197 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:50,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:50,197 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:50,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:50,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:50,272 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:20:50,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:20:50,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:50,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:20:50,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:50,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:20:50,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:50,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:50,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:50,378 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:20:50,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:20:50,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:20:50,704 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:51,152 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1164#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:51,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:51,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:51,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26, 29] total 54 [2021-11-25 20:20:51,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214031863] [2021-11-25 20:20:51,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:51,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 20:20:51,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:51,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 20:20:51,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3258, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:20:51,158 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 54 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 54 states have internal predecessors, (73), 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 20:20:52,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:52,257 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2021-11-25 20:20:52,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:20:52,258 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 54 states have internal predecessors, (73), 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 37 [2021-11-25 20:20:52,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:52,259 INFO L225 Difference]: With dead ends: 69 [2021-11-25 20:20:52,259 INFO L226 Difference]: Without dead ends: 66 [2021-11-25 20:20:52,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 60 SyntacticMatches, 28 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=170, Invalid=3370, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 20:20:52,262 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 1653 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:52,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 75 Invalid, 1662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1653 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 20:20:52,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-25 20:20:52,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2021-11-25 20:20:52,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 63 states have internal predecessors, (83), 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 20:20:52,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 83 transitions. [2021-11-25 20:20:52,274 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 83 transitions. Word has length 37 [2021-11-25 20:20:52,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:52,274 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 83 transitions. [2021-11-25 20:20:52,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 54 states have internal predecessors, (73), 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 20:20:52,275 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 83 transitions. [2021-11-25 20:20:52,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 20:20:52,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:52,276 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:52,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:52,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:52,499 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:52,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:52,500 INFO L85 PathProgramCache]: Analyzing trace with hash 1123091444, now seen corresponding path program 4 times [2021-11-25 20:20:52,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:52,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347133704] [2021-11-25 20:20:52,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:52,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:52,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:52,565 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:20:52,566 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:52,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347133704] [2021-11-25 20:20:52,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347133704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:52,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370274681] [2021-11-25 20:20:52,566 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:20:52,567 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:52,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:52,583 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:52,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:20:52,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:52,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:20:52,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:52,799 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:20:52,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:52,877 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:20:52,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370274681] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:52,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52604430] [2021-11-25 20:20:52,880 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:20:52,880 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:52,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:52,881 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:52,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:52,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:52,953 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:20:52,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:20:52,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:52,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:20:52,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:52,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:20:53,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:53,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:20:53,068 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:20:53,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:20:53,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:20:53,441 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:53,608 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1660#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:53,608 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:53,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:53,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:20:53,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537843040] [2021-11-25 20:20:53,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:53,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:20:53,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:53,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:20:53,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:20:53,611 INFO L87 Difference]: Start difference. First operand 64 states and 83 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 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 20:20:53,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:53,907 INFO L93 Difference]: Finished difference Result 126 states and 164 transitions. [2021-11-25 20:20:53,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:20:53,907 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 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 38 [2021-11-25 20:20:53,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:53,910 INFO L225 Difference]: With dead ends: 126 [2021-11-25 20:20:53,910 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 20:20:53,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:20:53,913 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:53,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 15 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:20:53,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 20:20:53,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-25 20:20:53,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.3125) internal successors, (84), 64 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 20:20:53,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2021-11-25 20:20:53,933 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 38 [2021-11-25 20:20:53,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:53,933 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2021-11-25 20:20:53,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 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 20:20:53,933 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2021-11-25 20:20:53,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:20:53,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:53,934 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:53,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:54,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:20:54,135 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:54,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:54,136 INFO L85 PathProgramCache]: Analyzing trace with hash 1487879979, now seen corresponding path program 5 times [2021-11-25 20:20:54,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:54,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108522919] [2021-11-25 20:20:54,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:54,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:54,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:54,199 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:20:54,199 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:54,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108522919] [2021-11-25 20:20:54,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108522919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:54,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535158200] [2021-11-25 20:20:54,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:20:54,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:54,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:54,216 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:54,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:20:54,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:20:54,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:54,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:20:54,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:54,417 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:20:54,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:54,506 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:20:54,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535158200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:54,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [947672502] [2021-11-25 20:20:54,509 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:20:54,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:54,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:54,510 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:54,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:54,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:54,556 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:20:54,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:20:54,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:54,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:20:54,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:54,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:20:54,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:54,632 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:20:54,652 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:20:54,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:20:54,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:20:54,984 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:55,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2282#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:55,155 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:55,155 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:55,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:20:55,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438997202] [2021-11-25 20:20:55,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:55,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:20:55,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:55,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:20:55,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:20:55,157 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 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 20:20:55,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:55,332 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2021-11-25 20:20:55,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:20:55,335 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 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 39 [2021-11-25 20:20:55,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:55,335 INFO L225 Difference]: With dead ends: 102 [2021-11-25 20:20:55,335 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 20:20:55,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:20:55,337 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 73 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:55,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 13 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:20:55,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 20:20:55,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-25 20:20:55,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 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 20:20:55,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2021-11-25 20:20:55,344 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 39 [2021-11-25 20:20:55,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:55,345 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2021-11-25 20:20:55,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 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 20:20:55,345 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2021-11-25 20:20:55,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 20:20:55,347 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:55,347 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:55,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:55,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:55,564 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:55,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:55,564 INFO L85 PathProgramCache]: Analyzing trace with hash -2044847426, now seen corresponding path program 6 times [2021-11-25 20:20:55,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:55,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329437542] [2021-11-25 20:20:55,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:55,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:55,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:58,558 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:58,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:58,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329437542] [2021-11-25 20:20:58,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329437542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:58,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875780304] [2021-11-25 20:20:58,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:20:58,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:58,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:58,559 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:58,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:20:58,656 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:20:58,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:58,659 WARN L261 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-25 20:20:58,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:01,648 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:21:01,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:05,456 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-25 20:21:05,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-25 20:21:05,795 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-25 20:21:05,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-25 20:21:05,893 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:21:05,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875780304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:05,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [90102220] [2021-11-25 20:21:05,896 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:21:05,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:05,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:05,897 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:05,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:05,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:05,936 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:21:05,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:21:05,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:05,973 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:21:05,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:21:05,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:05,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:21:06,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:06,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:06,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:06,061 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:21:06,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:21:06,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:21:06,426 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:07,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2972#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:07,040 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:07,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:07,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 36, 39] total 106 [2021-11-25 20:21:07,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022000937] [2021-11-25 20:21:07,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:07,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-25 20:21:07,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:07,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-25 20:21:07,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=11846, Unknown=0, NotChecked=0, Total=12210 [2021-11-25 20:21:07,045 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 106 states, 106 states have (on average 1.2264150943396226) internal successors, (130), 106 states have internal predecessors, (130), 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 20:21:21,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:21,135 INFO L93 Difference]: Finished difference Result 199 states and 249 transitions. [2021-11-25 20:21:21,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-25 20:21:21,136 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.2264150943396226) internal successors, (130), 106 states have internal predecessors, (130), 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 48 [2021-11-25 20:21:21,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:21,139 INFO L225 Difference]: With dead ends: 199 [2021-11-25 20:21:21,139 INFO L226 Difference]: Without dead ends: 195 [2021-11-25 20:21:21,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 60 SyntacticMatches, 20 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6829 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=1198, Invalid=26858, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 20:21:21,148 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 38 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 7217 mSolverCounterSat, 848 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 8065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 848 IncrementalHoareTripleChecker+Valid, 7217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:21,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 275 Invalid, 8065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [848 Valid, 7217 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-25 20:21:21,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-25 20:21:21,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 114. [2021-11-25 20:21:21,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.2654867256637168) internal successors, (143), 113 states have internal predecessors, (143), 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 20:21:21,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 143 transitions. [2021-11-25 20:21:21,179 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 143 transitions. Word has length 48 [2021-11-25 20:21:21,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:21,180 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 143 transitions. [2021-11-25 20:21:21,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.2264150943396226) internal successors, (130), 106 states have internal predecessors, (130), 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 20:21:21,180 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 143 transitions. [2021-11-25 20:21:21,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:21:21,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:21,182 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:21,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:21,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:21,395 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:21,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:21,396 INFO L85 PathProgramCache]: Analyzing trace with hash -291235994, now seen corresponding path program 7 times [2021-11-25 20:21:21,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:21,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940839123] [2021-11-25 20:21:21,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:21,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:21,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:21,496 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 20:21:21,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:21,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940839123] [2021-11-25 20:21:21,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940839123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:21,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110852551] [2021-11-25 20:21:21,497 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:21:21,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:21,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:21,499 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:21,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:21:21,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:21,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:21:21,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:21,729 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 20:21:21,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:21,810 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 20:21:21,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110852551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:21,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617697072] [2021-11-25 20:21:21,812 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:21:21,813 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:21,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:21,813 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:21,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:21,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:21,863 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:21:21,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:21:21,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:21,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:21:21,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:21,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:21:21,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:21,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:21,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:21,957 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:21:21,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:21:21,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:21:22,267 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:22,450 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4005#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:22,450 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:22,451 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:22,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 20:21:22,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212083109] [2021-11-25 20:21:22,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:22,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:21:22,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:22,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:21:22,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:21:22,453 INFO L87 Difference]: Start difference. First operand 114 states and 143 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 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 20:21:22,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:22,663 INFO L93 Difference]: Finished difference Result 187 states and 232 transitions. [2021-11-25 20:21:22,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:21:22,663 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 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 49 [2021-11-25 20:21:22,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:22,664 INFO L225 Difference]: With dead ends: 187 [2021-11-25 20:21:22,664 INFO L226 Difference]: Without dead ends: 85 [2021-11-25 20:21:22,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:21:22,666 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:22,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:21:22,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-25 20:21:22,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-11-25 20:21:22,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.25) internal successors, (105), 84 states have internal predecessors, (105), 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 20:21:22,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 105 transitions. [2021-11-25 20:21:22,683 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 105 transitions. Word has length 49 [2021-11-25 20:21:22,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:22,683 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 105 transitions. [2021-11-25 20:21:22,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 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 20:21:22,684 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 105 transitions. [2021-11-25 20:21:22,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:21:22,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:22,685 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:22,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:22,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 20:21:22,891 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:22,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:22,892 INFO L85 PathProgramCache]: Analyzing trace with hash 242058191, now seen corresponding path program 8 times [2021-11-25 20:21:22,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:22,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873330305] [2021-11-25 20:21:22,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:22,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:22,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:22,988 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:21:22,989 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:22,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873330305] [2021-11-25 20:21:22,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873330305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:22,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374372584] [2021-11-25 20:21:22,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:21:22,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:22,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:22,991 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:23,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:21:23,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:21:23,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:23,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:21:23,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:23,225 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:21:23,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:23,336 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:21:23,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374372584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:23,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [519391339] [2021-11-25 20:21:23,339 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:21:23,339 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:23,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:23,340 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:23,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:23,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:23,382 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:21:23,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:21:23,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:23,417 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:21:23,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:21:23,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:23,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:21:23,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:23,493 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:21:23,516 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:21:23,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:21:23,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:21:23,880 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:24,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4860#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:24,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:24,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:24,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 20:21:24,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083301593] [2021-11-25 20:21:24,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:24,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:21:24,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:24,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:21:24,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:21:24,021 INFO L87 Difference]: Start difference. First operand 85 states and 105 transitions. Second operand has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 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 20:21:24,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:24,203 INFO L93 Difference]: Finished difference Result 130 states and 167 transitions. [2021-11-25 20:21:24,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:21:24,203 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 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 50 [2021-11-25 20:21:24,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:24,204 INFO L225 Difference]: With dead ends: 130 [2021-11-25 20:21:24,204 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 20:21:24,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:21:24,205 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 57 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:24,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 13 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:21:24,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 20:21:24,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-25 20:21:24,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 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 20:21:24,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-11-25 20:21:24,217 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 50 [2021-11-25 20:21:24,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:24,218 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-11-25 20:21:24,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 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 20:21:24,218 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-11-25 20:21:24,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 20:21:24,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:24,220 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:24,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:24,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:21:24,423 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:24,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:24,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1661922165, now seen corresponding path program 9 times [2021-11-25 20:21:24,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:24,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824280815] [2021-11-25 20:21:24,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:24,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:24,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:28,812 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 3 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:28,812 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:28,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824280815] [2021-11-25 20:21:28,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824280815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:28,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060235815] [2021-11-25 20:21:28,812 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:28,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:28,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:28,813 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:28,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:21:28,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:28,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:28,922 WARN L261 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 167 conjunts are in the unsatisfiable core [2021-11-25 20:21:28,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:33,840 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:21:33,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:40,776 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-25 20:21:40,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 186 [2021-11-25 20:21:41,266 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-25 20:21:41,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 29 [2021-11-25 20:21:41,398 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:21:41,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060235815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:41,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [943733024] [2021-11-25 20:21:41,400 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:21:41,400 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:41,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:41,401 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:41,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:41,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:41,447 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:21:41,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:21:41,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:41,479 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:21:41,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:21:41,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:41,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:21:41,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:41,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:21:41,589 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:21:41,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:21:41,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:21:41,900 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:42,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5727#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:42,696 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:42,696 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:42,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 46, 49] total 137 [2021-11-25 20:21:42,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484036432] [2021-11-25 20:21:42,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:42,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2021-11-25 20:21:42,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:42,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-11-25 20:21:42,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=19577, Unknown=0, NotChecked=0, Total=20022 [2021-11-25 20:21:42,702 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 137 states, 137 states have (on average 1.1751824817518248) internal successors, (161), 137 states have internal predecessors, (161), 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 20:22:01,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:01,219 INFO L93 Difference]: Finished difference Result 137 states and 164 transitions. [2021-11-25 20:22:01,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 20:22:01,220 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.1751824817518248) internal successors, (161), 137 states have internal predecessors, (161), 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 59 [2021-11-25 20:22:01,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:01,221 INFO L225 Difference]: With dead ends: 137 [2021-11-25 20:22:01,221 INFO L226 Difference]: Without dead ends: 134 [2021-11-25 20:22:01,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 73 SyntacticMatches, 20 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9129 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=1218, Invalid=37002, Unknown=0, NotChecked=0, Total=38220 [2021-11-25 20:22:01,225 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 42 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 8981 mSolverCounterSat, 714 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 9695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 714 IncrementalHoareTripleChecker+Valid, 8981 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:01,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 316 Invalid, 9695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [714 Valid, 8981 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2021-11-25 20:22:01,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-25 20:22:01,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 82. [2021-11-25 20:22:01,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1975308641975309) internal successors, (97), 81 states have internal predecessors, (97), 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 20:22:01,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions. [2021-11-25 20:22:01,249 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 59 [2021-11-25 20:22:01,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:01,250 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 97 transitions. [2021-11-25 20:22:01,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 1.1751824817518248) internal successors, (161), 137 states have internal predecessors, (161), 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 20:22:01,250 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions. [2021-11-25 20:22:01,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:22:01,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:01,251 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:01,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:01,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:01,455 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:01,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:01,455 INFO L85 PathProgramCache]: Analyzing trace with hash -352141007, now seen corresponding path program 10 times [2021-11-25 20:22:01,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:01,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340645389] [2021-11-25 20:22:01,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:01,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:01,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:01,558 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 20:22:01,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:01,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340645389] [2021-11-25 20:22:01,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340645389] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:01,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998273531] [2021-11-25 20:22:01,559 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:22:01,559 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:01,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:01,563 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:01,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:22:01,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:01,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:22:01,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:01,864 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 20:22:01,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:01,966 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-25 20:22:01,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998273531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:01,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [932476806] [2021-11-25 20:22:01,968 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:22:01,969 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:01,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:01,969 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:01,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:01,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:02,021 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:22:02,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:22:02,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:02,057 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:22:02,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:22:02,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:02,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:22:02,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:02,128 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:22:02,152 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:22:02,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:22:02,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:22:02,414 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:02,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6636#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:02,568 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:02,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:02,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 20:22:02,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397518997] [2021-11-25 20:22:02,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:02,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:22:02,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:02,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:22:02,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:22:02,570 INFO L87 Difference]: Start difference. First operand 82 states and 97 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 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 20:22:02,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:02,846 INFO L93 Difference]: Finished difference Result 204 states and 243 transitions. [2021-11-25 20:22:02,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:22:02,846 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 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 60 [2021-11-25 20:22:02,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:02,847 INFO L225 Difference]: With dead ends: 204 [2021-11-25 20:22:02,847 INFO L226 Difference]: Without dead ends: 83 [2021-11-25 20:22:02,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:22:02,849 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:02,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 17 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:22:02,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-25 20:22:02,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-25 20:22:02,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 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 20:22:02,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2021-11-25 20:22:02,878 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 60 [2021-11-25 20:22:02,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:02,878 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2021-11-25 20:22:02,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 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 20:22:02,879 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2021-11-25 20:22:02,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 20:22:02,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:02,880 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:02,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:03,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:03,095 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:03,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:03,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1564125480, now seen corresponding path program 11 times [2021-11-25 20:22:03,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:03,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236470034] [2021-11-25 20:22:03,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:03,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:03,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:03,236 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-25 20:22:03,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:03,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236470034] [2021-11-25 20:22:03,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236470034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:03,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924018629] [2021-11-25 20:22:03,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:22:03,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:03,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:03,238 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:03,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:22:03,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:22:03,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:03,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:22:03,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:03,522 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-25 20:22:03,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:03,611 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-25 20:22:03,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924018629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:03,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1510974087] [2021-11-25 20:22:03,613 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:22:03,613 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:03,613 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:03,613 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:03,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:03,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:03,646 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:22:03,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:22:03,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:03,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:22:03,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:03,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:22:03,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:03,738 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:22:03,756 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:22:03,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:22:03,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:22:04,034 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:04,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7596#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:04,190 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:04,190 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:04,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2021-11-25 20:22:04,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702359961] [2021-11-25 20:22:04,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:04,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 20:22:04,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:04,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 20:22:04,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=678, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:22:04,192 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 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 20:22:04,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:04,567 INFO L93 Difference]: Finished difference Result 141 states and 174 transitions. [2021-11-25 20:22:04,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:22:04,567 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 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 61 [2021-11-25 20:22:04,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:04,568 INFO L225 Difference]: With dead ends: 141 [2021-11-25 20:22:04,568 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 20:22:04,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=241, Invalid=1019, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:22:04,569 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 366 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 366 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:04,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 15 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [366 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:22:04,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 20:22:04,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-25 20:22:04,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 70 states have internal predecessors, (81), 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 20:22:04,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2021-11-25 20:22:04,587 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 61 [2021-11-25 20:22:04,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:04,587 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2021-11-25 20:22:04,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 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 20:22:04,587 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2021-11-25 20:22:04,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 20:22:04,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:04,588 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:04,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:04,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:22:04,789 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:04,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:04,789 INFO L85 PathProgramCache]: Analyzing trace with hash 458943518, now seen corresponding path program 12 times [2021-11-25 20:22:04,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:04,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992744410] [2021-11-25 20:22:04,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:04,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:05,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:10,807 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 7 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:10,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:10,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992744410] [2021-11-25 20:22:10,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992744410] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:10,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569746302] [2021-11-25 20:22:10,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:22:10,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:10,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:10,823 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:10,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:22:10,959 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:22:10,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:10,963 WARN L261 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 207 conjunts are in the unsatisfiable core [2021-11-25 20:22:10,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:17,929 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:22:17,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:28,457 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-25 20:22:28,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 286 [2021-11-25 20:22:30,276 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-25 20:22:30,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 35 [2021-11-25 20:22:30,485 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:22:30,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569746302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:30,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1192871952] [2021-11-25 20:22:30,487 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:22:30,487 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:30,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:30,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:30,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:30,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:30,539 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:22:30,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:22:30,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:30,566 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:22:30,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:22:30,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:30,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:22:30,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:30,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:30,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:30,667 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:22:30,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:22:30,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:22:30,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:31,893 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8611#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:31,893 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:31,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:31,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 56, 59] total 165 [2021-11-25 20:22:31,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465018768] [2021-11-25 20:22:31,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:31,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2021-11-25 20:22:31,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:31,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2021-11-25 20:22:31,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=606, Invalid=28124, Unknown=0, NotChecked=0, Total=28730 [2021-11-25 20:22:31,897 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 165 states, 165 states have (on average 1.1454545454545455) internal successors, (189), 165 states have internal predecessors, (189), 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 20:23:01,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:01,089 INFO L93 Difference]: Finished difference Result 289 states and 343 transitions. [2021-11-25 20:23:01,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-25 20:23:01,090 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 1.1454545454545455) internal successors, (189), 165 states have internal predecessors, (189), 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 70 [2021-11-25 20:23:01,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:01,092 INFO L225 Difference]: With dead ends: 289 [2021-11-25 20:23:01,092 INFO L226 Difference]: Without dead ends: 285 [2021-11-25 20:23:01,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 88 SyntacticMatches, 21 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14979 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=1955, Invalid=54451, Unknown=0, NotChecked=0, Total=56406 [2021-11-25 20:23:01,096 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 35 mSDsluCounter, 620 mSDsCounter, 0 mSdLazyCounter, 15714 mSolverCounterSat, 1187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 16901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1187 IncrementalHoareTripleChecker+Valid, 15714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:01,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 623 Invalid, 16901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1187 Valid, 15714 Invalid, 0 Unknown, 0 Unchecked, 12.6s Time] [2021-11-25 20:23:01,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-25 20:23:01,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 159. [2021-11-25 20:23:01,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.1772151898734178) internal successors, (186), 158 states have internal predecessors, (186), 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 20:23:01,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 186 transitions. [2021-11-25 20:23:01,152 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 186 transitions. Word has length 70 [2021-11-25 20:23:01,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:01,152 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 186 transitions. [2021-11-25 20:23:01,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 1.1454545454545455) internal successors, (189), 165 states have internal predecessors, (189), 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 20:23:01,153 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 186 transitions. [2021-11-25 20:23:01,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 20:23:01,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:01,153 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:01,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-25 20:23:01,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:23:01,354 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:01,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:01,355 INFO L85 PathProgramCache]: Analyzing trace with hash 89370822, now seen corresponding path program 13 times [2021-11-25 20:23:01,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:01,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048787253] [2021-11-25 20:23:01,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:01,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:01,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:01,485 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 20:23:01,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:01,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048787253] [2021-11-25 20:23:01,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048787253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:01,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603704768] [2021-11-25 20:23:01,486 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:23:01,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:01,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:01,500 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:01,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:23:01,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:01,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:23:01,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:01,834 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 20:23:01,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:01,964 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 20:23:01,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603704768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:01,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [855174856] [2021-11-25 20:23:01,966 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:23:01,966 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:23:01,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:23:01,966 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:23:01,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:23:01,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:02,005 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:23:02,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:23:02,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:02,038 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:23:02,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:23:02,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:02,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:23:02,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:02,099 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:23:02,120 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:23:02,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:23:02,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:23:02,382 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:23:02,545 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10068#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:23:02,545 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:23:02,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:23:02,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 20:23:02,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594355711] [2021-11-25 20:23:02,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:02,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:23:02,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:02,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:23:02,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:23:02,547 INFO L87 Difference]: Start difference. First operand 159 states and 186 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 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 20:23:02,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:02,880 INFO L93 Difference]: Finished difference Result 285 states and 332 transitions. [2021-11-25 20:23:02,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:23:02,880 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 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 71 [2021-11-25 20:23:02,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:02,881 INFO L225 Difference]: With dead ends: 285 [2021-11-25 20:23:02,881 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 20:23:02,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=896, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:23:02,883 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:02,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:23:02,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 20:23:02,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-11-25 20:23:02,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.165289256198347) internal successors, (141), 121 states have internal predecessors, (141), 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 20:23:02,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 141 transitions. [2021-11-25 20:23:02,938 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 141 transitions. Word has length 71 [2021-11-25 20:23:02,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:02,938 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 141 transitions. [2021-11-25 20:23:02,938 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 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 20:23:02,939 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 141 transitions. [2021-11-25 20:23:02,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 20:23:02,939 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:02,939 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:02,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:03,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:03,140 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:03,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:03,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1822689169, now seen corresponding path program 14 times [2021-11-25 20:23:03,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:03,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262629365] [2021-11-25 20:23:03,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:03,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:03,269 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-25 20:23:03,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:03,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262629365] [2021-11-25 20:23:03,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262629365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:03,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667101724] [2021-11-25 20:23:03,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:23:03,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:03,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:03,271 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:03,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:23:03,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:23:03,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:03,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:23:03,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:03,599 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-25 20:23:03,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:03,725 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-25 20:23:03,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667101724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:03,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1508187881] [2021-11-25 20:23:03,727 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:23:03,727 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:23:03,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:23:03,727 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:23:03,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:23:03,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:03,774 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:23:03,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:23:03,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:03,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:23:03,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:03,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:23:03,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:03,839 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:23:03,856 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:23:03,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:23:03,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:23:04,192 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:23:04,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11335#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:23:04,372 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:23:04,373 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:23:04,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 20:23:04,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588334383] [2021-11-25 20:23:04,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:04,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:23:04,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:04,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:23:04,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:23:04,374 INFO L87 Difference]: Start difference. First operand 122 states and 141 transitions. Second operand has 23 states, 23 states have (on average 3.0) internal successors, (69), 23 states have internal predecessors, (69), 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 20:23:04,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:04,651 INFO L93 Difference]: Finished difference Result 183 states and 219 transitions. [2021-11-25 20:23:04,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:23:04,652 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0) internal successors, (69), 23 states have internal predecessors, (69), 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 72 [2021-11-25 20:23:04,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:04,652 INFO L225 Difference]: With dead ends: 183 [2021-11-25 20:23:04,652 INFO L226 Difference]: Without dead ends: 82 [2021-11-25 20:23:04,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 201 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:23:04,653 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:04,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:23:04,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-25 20:23:04,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-11-25 20:23:04,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1358024691358024) internal successors, (92), 81 states have internal predecessors, (92), 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 20:23:04,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2021-11-25 20:23:04,683 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 72 [2021-11-25 20:23:04,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:04,683 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2021-11-25 20:23:04,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.0) internal successors, (69), 23 states have internal predecessors, (69), 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 20:23:04,684 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2021-11-25 20:23:04,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 20:23:04,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:04,684 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:04,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:04,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:23:04,885 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:04,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:04,885 INFO L85 PathProgramCache]: Analyzing trace with hash -1024746859, now seen corresponding path program 15 times [2021-11-25 20:23:04,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:04,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867532758] [2021-11-25 20:23:04,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:04,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:05,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:14,063 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 1 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:14,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:14,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867532758] [2021-11-25 20:23:14,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867532758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:14,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788961824] [2021-11-25 20:23:14,064 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:23:14,064 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:14,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:14,070 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:14,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:23:14,296 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:23:14,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:14,300 WARN L261 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 247 conjunts are in the unsatisfiable core [2021-11-25 20:23:14,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:26,001 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:23:26,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:44,114 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-25 20:23:44,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-25 20:23:47,132 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-25 20:23:47,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-25 20:23:47,350 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:23:47,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788961824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:47,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1964489359] [2021-11-25 20:23:47,352 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:23:47,352 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:23:47,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:23:47,353 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:23:47,353 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:23:47,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:47,386 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:23:47,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:23:47,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:47,419 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:23:47,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:23:47,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:47,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:23:47,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:47,524 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:23:47,541 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:23:47,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:23:47,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:23:47,811 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:23:49,090 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12548#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:23:49,090 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:23:49,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:23:49,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 66, 69] total 197 [2021-11-25 20:23:49,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520155091] [2021-11-25 20:23:49,091 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:49,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 197 states [2021-11-25 20:23:49,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:49,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2021-11-25 20:23:49,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=39924, Unknown=0, NotChecked=0, Total=40602 [2021-11-25 20:23:49,094 INFO L87 Difference]: Start difference. First operand 82 states and 92 transitions. Second operand has 197 states, 197 states have (on average 1.1218274111675126) internal successors, (221), 197 states have internal predecessors, (221), 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 20:24:14,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:14,812 INFO L93 Difference]: Finished difference Result 149 states and 168 transitions. [2021-11-25 20:24:14,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-25 20:24:14,813 INFO L78 Accepts]: Start accepts. Automaton has has 197 states, 197 states have (on average 1.1218274111675126) internal successors, (221), 197 states have internal predecessors, (221), 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 81 [2021-11-25 20:24:14,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:14,814 INFO L225 Difference]: With dead ends: 149 [2021-11-25 20:24:14,814 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 20:24:14,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 99 SyntacticMatches, 22 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14439 ImplicationChecksByTransitivity, 52.2s TimeCoverageRelationStatistics Valid=1340, Invalid=66520, Unknown=0, NotChecked=0, Total=67860 [2021-11-25 20:24:14,817 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 12027 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 12194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 12027 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:14,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 271 Invalid, 12194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 12027 Invalid, 0 Unknown, 0 Unchecked, 8.9s Time] [2021-11-25 20:24:14,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 20:24:14,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 140. [2021-11-25 20:24:14,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.143884892086331) internal successors, (159), 139 states have internal predecessors, (159), 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 20:24:14,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 159 transitions. [2021-11-25 20:24:14,870 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 159 transitions. Word has length 81 [2021-11-25 20:24:14,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:14,870 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 159 transitions. [2021-11-25 20:24:14,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 197 states, 197 states have (on average 1.1218274111675126) internal successors, (221), 197 states have internal predecessors, (221), 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 20:24:14,871 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 159 transitions. [2021-11-25 20:24:14,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 20:24:14,871 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:14,872 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:14,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:15,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:24:15,072 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:15,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:15,073 INFO L85 PathProgramCache]: Analyzing trace with hash -255477196, now seen corresponding path program 16 times [2021-11-25 20:24:15,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:15,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737915919] [2021-11-25 20:24:15,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:15,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:15,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:15,242 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-25 20:24:15,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:15,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737915919] [2021-11-25 20:24:15,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737915919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:15,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637629472] [2021-11-25 20:24:15,243 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:24:15,244 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:15,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:15,256 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:15,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:24:15,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:15,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:24:15,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:15,649 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-25 20:24:15,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:24:15,797 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-25 20:24:15,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637629472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:24:15,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [603742383] [2021-11-25 20:24:15,799 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:24:15,799 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:24:15,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:24:15,799 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:24:15,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:24:15,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:15,840 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:24:15,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:24:15,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:15,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:24:15,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:15,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:24:15,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:15,922 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:24:15,939 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:24:15,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:24:16,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:24:16,205 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:24:16,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13748#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:24:16,410 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:24:16,410 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:24:16,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 20:24:16,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290584756] [2021-11-25 20:24:16,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:24:16,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:24:16,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:16,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:24:16,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:24:16,412 INFO L87 Difference]: Start difference. First operand 140 states and 159 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 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 20:24:16,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:16,828 INFO L93 Difference]: Finished difference Result 278 states and 316 transitions. [2021-11-25 20:24:16,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:24:16,828 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 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 82 [2021-11-25 20:24:16,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:16,831 INFO L225 Difference]: With dead ends: 278 [2021-11-25 20:24:16,831 INFO L226 Difference]: Without dead ends: 141 [2021-11-25 20:24:16,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=284, Invalid=1122, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:24:16,832 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 629 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:16,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 9 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 629 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:24:16,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-25 20:24:16,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-11-25 20:24:16,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.1428571428571428) internal successors, (160), 140 states have internal predecessors, (160), 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 20:24:16,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 160 transitions. [2021-11-25 20:24:16,894 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 160 transitions. Word has length 82 [2021-11-25 20:24:16,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:16,895 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 160 transitions. [2021-11-25 20:24:16,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 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 20:24:16,895 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 160 transitions. [2021-11-25 20:24:16,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 20:24:16,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:16,896 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:16,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:17,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:24:17,123 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:17,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:17,124 INFO L85 PathProgramCache]: Analyzing trace with hash 652295915, now seen corresponding path program 17 times [2021-11-25 20:24:17,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:17,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134406454] [2021-11-25 20:24:17,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:17,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:17,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:17,285 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:24:17,285 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:17,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134406454] [2021-11-25 20:24:17,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134406454] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:17,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243192035] [2021-11-25 20:24:17,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:24:17,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:17,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:17,286 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:17,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:24:17,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:24:17,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:24:17,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:24:17,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:17,742 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:24:17,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:24:17,910 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:24:17,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243192035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:24:17,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1185021944] [2021-11-25 20:24:17,912 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:24:17,912 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:24:17,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:24:17,912 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:24:17,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:24:17,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:17,954 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:24:17,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:24:17,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:17,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:24:17,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:17,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:24:18,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:18,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:18,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:18,049 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:24:18,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:24:18,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:24:18,309 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:24:18,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15110#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:24:18,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:24:18,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:24:18,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 20:24:18,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397625695] [2021-11-25 20:24:18,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:24:18,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:24:18,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:18,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:24:18,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:24:18,470 INFO L87 Difference]: Start difference. First operand 141 states and 160 transitions. Second operand has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 26 states have internal predecessors, (61), 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 20:24:18,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:18,822 INFO L93 Difference]: Finished difference Result 210 states and 246 transitions. [2021-11-25 20:24:18,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:24:18,823 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 26 states have internal predecessors, (61), 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 83 [2021-11-25 20:24:18,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:18,823 INFO L225 Difference]: With dead ends: 210 [2021-11-25 20:24:18,824 INFO L226 Difference]: Without dead ends: 93 [2021-11-25 20:24:18,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 233 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=348, Invalid=1134, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:24:18,824 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 86 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 407 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 407 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:18,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 21 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [407 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:24:18,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-25 20:24:18,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-11-25 20:24:18,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1195652173913044) internal successors, (103), 92 states have internal predecessors, (103), 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 20:24:18,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2021-11-25 20:24:18,857 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 83 [2021-11-25 20:24:18,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:18,857 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2021-11-25 20:24:18,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 26 states have internal predecessors, (61), 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 20:24:18,858 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2021-11-25 20:24:18,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 20:24:18,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:18,858 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:18,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:19,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:19,059 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:19,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:19,059 INFO L85 PathProgramCache]: Analyzing trace with hash 1461347710, now seen corresponding path program 18 times [2021-11-25 20:24:19,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:19,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807129787] [2021-11-25 20:24:19,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:19,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:19,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:30,936 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 3 proven. 305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:24:30,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:30,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807129787] [2021-11-25 20:24:30,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807129787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:30,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435433412] [2021-11-25 20:24:30,936 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:24:30,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:30,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:30,937 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:30,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:24:31,142 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:24:31,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:24:31,147 WARN L261 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 287 conjunts are in the unsatisfiable core [2021-11-25 20:24:31,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:41,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:24:41,853 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:24:41,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 20:24:42,123 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:24:42,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:06,632 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-25 20:25:06,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 551 [2021-11-25 20:25:12,077 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-25 20:25:12,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 48 [2021-11-25 20:25:12,316 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:25:12,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435433412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:25:12,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [357780217] [2021-11-25 20:25:12,318 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:25:12,318 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:25:12,318 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:25:12,318 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:25:12,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:25:12,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:12,368 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:25:12,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:25:12,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:12,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:25:12,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:12,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:25:12,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:12,429 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:12,448 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:25:12,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:25:12,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:25:12,763 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:25:14,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16475#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:25:14,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:25:14,166 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:25:14,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 76, 79] total 205 [2021-11-25 20:25:14,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999469304] [2021-11-25 20:25:14,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:25:14,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2021-11-25 20:25:14,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:14,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2021-11-25 20:25:14,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=43148, Unknown=0, NotChecked=0, Total=43890 [2021-11-25 20:25:14,169 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand has 205 states, 205 states have (on average 1.1170731707317074) internal successors, (229), 205 states have internal predecessors, (229), 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 20:25:46,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:46,089 INFO L93 Difference]: Finished difference Result 169 states and 188 transitions. [2021-11-25 20:25:46,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-25 20:25:46,090 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 1.1170731707317074) internal successors, (229), 205 states have internal predecessors, (229), 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 20:25:46,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:46,091 INFO L225 Difference]: With dead ends: 169 [2021-11-25 20:25:46,091 INFO L226 Difference]: Without dead ends: 166 [2021-11-25 20:25:46,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 131 SyntacticMatches, 26 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14447 ImplicationChecksByTransitivity, 63.3s TimeCoverageRelationStatistics Valid=1564, Invalid=75998, Unknown=0, NotChecked=0, Total=77562 [2021-11-25 20:25:46,097 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 12998 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 13205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 12998 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:46,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 249 Invalid, 13205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 12998 Invalid, 0 Unknown, 0 Unchecked, 10.5s Time] [2021-11-25 20:25:46,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-25 20:25:46,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 159. [2021-11-25 20:25:46,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.1265822784810127) internal successors, (178), 158 states have internal predecessors, (178), 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 20:25:46,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 178 transitions. [2021-11-25 20:25:46,162 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 178 transitions. Word has length 92 [2021-11-25 20:25:46,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:46,162 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 178 transitions. [2021-11-25 20:25:46,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 1.1170731707317074) internal successors, (229), 205 states have internal predecessors, (229), 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 20:25:46,162 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 178 transitions. [2021-11-25 20:25:46,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 20:25:46,163 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:46,163 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:46,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:25:46,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:46,364 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:46,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:46,364 INFO L85 PathProgramCache]: Analyzing trace with hash -886827051, now seen corresponding path program 19 times [2021-11-25 20:25:46,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:46,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670234329] [2021-11-25 20:25:46,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:46,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:46,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:46,599 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 20:25:46,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:46,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670234329] [2021-11-25 20:25:46,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670234329] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:46,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511663063] [2021-11-25 20:25:46,600 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:25:46,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:46,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:46,602 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:46,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:25:46,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:46,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:25:46,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:47,109 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 20:25:47,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:47,253 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 20:25:47,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511663063] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:25:47,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1298510608] [2021-11-25 20:25:47,254 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:25:47,254 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:25:47,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:25:47,255 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:25:47,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:25:47,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:47,302 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:25:47,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:25:47,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:47,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:25:47,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:47,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:25:47,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:47,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:47,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:47,407 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:25:47,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:25:47,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:25:47,647 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:25:47,830 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17842#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:25:47,830 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:25:47,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:25:47,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 20:25:47,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213435109] [2021-11-25 20:25:47,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:25:47,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:25:47,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:47,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:25:47,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:25:47,832 INFO L87 Difference]: Start difference. First operand 159 states and 178 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 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 20:25:48,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:48,471 INFO L93 Difference]: Finished difference Result 316 states and 354 transitions. [2021-11-25 20:25:48,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:25:48,479 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 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 93 [2021-11-25 20:25:48,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:48,480 INFO L225 Difference]: With dead ends: 316 [2021-11-25 20:25:48,480 INFO L226 Difference]: Without dead ends: 160 [2021-11-25 20:25:48,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:25:48,481 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1056 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 1206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 1056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:48,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 27 Invalid, 1206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 1056 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:25:48,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-25 20:25:48,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-11-25 20:25:48,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.1257861635220126) internal successors, (179), 159 states have internal predecessors, (179), 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 20:25:48,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 179 transitions. [2021-11-25 20:25:48,568 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 179 transitions. Word has length 93 [2021-11-25 20:25:48,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:48,568 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 179 transitions. [2021-11-25 20:25:48,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 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 20:25:48,568 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 179 transitions. [2021-11-25 20:25:48,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 20:25:48,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:48,569 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:48,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:25:48,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 20:25:48,769 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:48,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:48,770 INFO L85 PathProgramCache]: Analyzing trace with hash 1600867006, now seen corresponding path program 20 times [2021-11-25 20:25:48,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:48,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317038680] [2021-11-25 20:25:48,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:48,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:48,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:25:48,973 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-25 20:25:48,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:25:48,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317038680] [2021-11-25 20:25:48,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317038680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:48,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375550607] [2021-11-25 20:25:48,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:25:48,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:48,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:48,975 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:48,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:25:49,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:25:49,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:25:49,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:25:49,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:49,516 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-25 20:25:49,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:49,680 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-25 20:25:49,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375550607] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:25:49,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3093454] [2021-11-25 20:25:49,682 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:25:49,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:25:49,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:25:49,683 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:25:49,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:25:49,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,738 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:25:49,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:25:49,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,771 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:25:49,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:25:49,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:25:49,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:25:49,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:49,867 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:25:49,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:25:49,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:25:50,105 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:25:50,265 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19389#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:25:50,265 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:25:50,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:25:50,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 20:25:50,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088398451] [2021-11-25 20:25:50,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:25:50,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:25:50,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:25:50,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:25:50,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:25:50,267 INFO L87 Difference]: Start difference. First operand 160 states and 179 transitions. Second operand has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 states have internal predecessors, (65), 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 20:25:50,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:25:50,709 INFO L93 Difference]: Finished difference Result 237 states and 273 transitions. [2021-11-25 20:25:50,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:25:50,711 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 states have internal predecessors, (65), 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 94 [2021-11-25 20:25:50,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:25:50,712 INFO L225 Difference]: With dead ends: 237 [2021-11-25 20:25:50,712 INFO L226 Difference]: Without dead ends: 104 [2021-11-25 20:25:50,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 265 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:25:50,713 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 640 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 640 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:25:50,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 11 Invalid, 862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [640 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:25:50,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-25 20:25:50,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-25 20:25:50,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.1067961165048543) internal successors, (114), 103 states have internal predecessors, (114), 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 20:25:50,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 114 transitions. [2021-11-25 20:25:50,752 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 114 transitions. Word has length 94 [2021-11-25 20:25:50,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:25:50,752 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 114 transitions. [2021-11-25 20:25:50,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 states have internal predecessors, (65), 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 20:25:50,753 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 114 transitions. [2021-11-25 20:25:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:25:50,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:25:50,754 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:25:50,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:25:50,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:50,979 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:25:50,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:25:50,979 INFO L85 PathProgramCache]: Analyzing trace with hash -650780235, now seen corresponding path program 21 times [2021-11-25 20:25:50,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:25:50,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866829379] [2021-11-25 20:25:50,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:25:50,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:25:51,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:26:05,661 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 45 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:26:05,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:26:05,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866829379] [2021-11-25 20:26:05,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866829379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:26:05,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415665151] [2021-11-25 20:26:05,662 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:26:05,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:26:05,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:26:05,663 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:26:05,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:26:05,926 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:26:05,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:26:05,931 WARN L261 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 327 conjunts are in the unsatisfiable core [2021-11-25 20:26:05,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:26:20,494 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:26:20,496 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:26:20,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 20:26:20,792 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:26:20,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:26:53,727 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-25 20:26:53,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 718 [2021-11-25 20:27:12,175 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-25 20:27:12,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 53 [2021-11-25 20:27:12,447 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:27:12,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415665151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:27:12,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88100981] [2021-11-25 20:27:12,449 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:27:12,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:27:12,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:27:12,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:27:12,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:27:12,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:27:12,497 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:27:12,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:27:12,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:27:12,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:27:12,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:27:12,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:27:12,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:27:12,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:27:12,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:27:12,587 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:27:12,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:27:12,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:27:12,902 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:27:14,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20923#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:27:14,507 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:27:14,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:27:14,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 86, 89] total 230 [2021-11-25 20:27:14,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362480364] [2021-11-25 20:27:14,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:27:14,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 230 states [2021-11-25 20:27:14,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:27:14,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 230 interpolants. [2021-11-25 20:27:14,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=802, Invalid=54188, Unknown=0, NotChecked=0, Total=54990 [2021-11-25 20:27:14,513 INFO L87 Difference]: Start difference. First operand 104 states and 114 transitions. Second operand has 230 states, 230 states have (on average 1.1) internal successors, (253), 230 states have internal predecessors, (253), 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 20:28:11,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:11,951 INFO L93 Difference]: Finished difference Result 300 states and 333 transitions. [2021-11-25 20:28:11,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-11-25 20:28:11,952 INFO L78 Accepts]: Start accepts. Automaton has has 230 states, 230 states have (on average 1.1) internal successors, (253), 230 states have internal predecessors, (253), 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 103 [2021-11-25 20:28:11,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:11,954 INFO L225 Difference]: With dead ends: 300 [2021-11-25 20:28:11,954 INFO L226 Difference]: Without dead ends: 296 [2021-11-25 20:28:11,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 133 SyntacticMatches, 43 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22005 ImplicationChecksByTransitivity, 88.4s TimeCoverageRelationStatistics Valid=2269, Invalid=96641, Unknown=0, NotChecked=0, Total=98910 [2021-11-25 20:28:11,962 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 43 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 27066 mSolverCounterSat, 1229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 28295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1229 IncrementalHoareTripleChecker+Valid, 27066 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:11,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 295 Invalid, 28295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1229 Valid, 27066 Invalid, 0 Unknown, 0 Unchecked, 23.3s Time] [2021-11-25 20:28:11,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-25 20:28:12,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 243. [2021-11-25 20:28:12,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.1198347107438016) internal successors, (271), 242 states have internal predecessors, (271), 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 20:28:12,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 271 transitions. [2021-11-25 20:28:12,079 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 271 transitions. Word has length 103 [2021-11-25 20:28:12,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:12,079 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 271 transitions. [2021-11-25 20:28:12,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 230 states, 230 states have (on average 1.1) internal successors, (253), 230 states have internal predecessors, (253), 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 20:28:12,080 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 271 transitions. [2021-11-25 20:28:12,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 20:28:12,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:12,081 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:12,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:12,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:12,291 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:12,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:12,292 INFO L85 PathProgramCache]: Analyzing trace with hash -2141023375, now seen corresponding path program 22 times [2021-11-25 20:28:12,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:12,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796038] [2021-11-25 20:28:12,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:12,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:12,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-11-25 20:28:12,522 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:12,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796038] [2021-11-25 20:28:12,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796038] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:12,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902982576] [2021-11-25 20:28:12,523 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:28:12,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:12,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:12,527 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:12,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:28:12,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:12,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:28:12,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:13,044 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-11-25 20:28:13,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:13,201 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-11-25 20:28:13,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902982576] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:13,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [285295216] [2021-11-25 20:28:13,203 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:28:13,203 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:13,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:13,203 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:13,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:13,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:13,240 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:28:13,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:28:13,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:13,269 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:28:13,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:28:13,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:13,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:28:13,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:13,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:13,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:13,343 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:28:13,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:28:13,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:28:13,546 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:13,765 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22810#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:13,766 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:13,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:13,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-25 20:28:13,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431922376] [2021-11-25 20:28:13,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:13,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:28:13,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:13,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:28:13,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1066, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:28:13,767 INFO L87 Difference]: Start difference. First operand 243 states and 271 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 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 20:28:14,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:14,363 INFO L93 Difference]: Finished difference Result 401 states and 445 transitions. [2021-11-25 20:28:14,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:28:14,364 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 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 104 [2021-11-25 20:28:14,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:14,364 INFO L225 Difference]: With dead ends: 401 [2021-11-25 20:28:14,364 INFO L226 Difference]: Without dead ends: 179 [2021-11-25 20:28:14,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:28:14,366 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 891 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 1115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:14,366 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 11 Invalid, 1115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 891 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:28:14,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-25 20:28:14,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-11-25 20:28:14,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.1123595505617978) internal successors, (198), 178 states have internal predecessors, (198), 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 20:28:14,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 198 transitions. [2021-11-25 20:28:14,468 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 198 transitions. Word has length 104 [2021-11-25 20:28:14,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:14,468 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 198 transitions. [2021-11-25 20:28:14,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 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 20:28:14,469 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 198 transitions. [2021-11-25 20:28:14,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-25 20:28:14,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:14,470 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:14,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:14,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 20:28:14,695 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:14,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:14,695 INFO L85 PathProgramCache]: Analyzing trace with hash -119403829, now seen corresponding path program 23 times [2021-11-25 20:28:14,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:14,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446789668] [2021-11-25 20:28:14,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:14,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:14,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:14,915 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2021-11-25 20:28:14,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:14,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446789668] [2021-11-25 20:28:14,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446789668] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:14,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934448242] [2021-11-25 20:28:14,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:28:14,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:14,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:14,917 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:14,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:28:15,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:28:15,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:15,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:28:15,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2021-11-25 20:28:15,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:15,828 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2021-11-25 20:28:15,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934448242] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:15,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1387937515] [2021-11-25 20:28:15,829 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:28:15,829 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:15,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:28:15,830 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:28:15,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:28:15,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:15,866 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:28:15,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:28:15,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:15,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:28:15,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:15,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:28:15,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:15,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:15,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:28:15,978 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:28:15,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:28:16,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:28:16,243 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:28:16,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24644#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:28:16,488 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:28:16,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:16,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-11-25 20:28:16,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931104873] [2021-11-25 20:28:16,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:16,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:28:16,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:16,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:28:16,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:28:16,490 INFO L87 Difference]: Start difference. First operand 179 states and 198 transitions. Second operand has 40 states, 40 states have (on average 2.225) internal successors, (89), 40 states have internal predecessors, (89), 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 20:28:17,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:17,193 INFO L93 Difference]: Finished difference Result 264 states and 300 transitions. [2021-11-25 20:28:17,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:28:17,194 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.225) internal successors, (89), 40 states have internal predecessors, (89), 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 105 [2021-11-25 20:28:17,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:17,195 INFO L225 Difference]: With dead ends: 264 [2021-11-25 20:28:17,195 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 20:28:17,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 299 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:28:17,196 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 876 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 1623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 876 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:17,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 11 Invalid, 1623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [876 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:28:17,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 20:28:17,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-25 20:28:17,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0964912280701755) internal successors, (125), 114 states have internal predecessors, (125), 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 20:28:17,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 125 transitions. [2021-11-25 20:28:17,281 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 125 transitions. Word has length 105 [2021-11-25 20:28:17,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:17,281 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 125 transitions. [2021-11-25 20:28:17,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.225) internal successors, (89), 40 states have internal predecessors, (89), 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 20:28:17,282 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 125 transitions. [2021-11-25 20:28:17,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-25 20:28:17,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:17,283 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:17,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:17,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:28:17,508 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:28:17,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:17,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1890485982, now seen corresponding path program 24 times [2021-11-25 20:28:17,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:17,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776356121] [2021-11-25 20:28:17,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:17,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:18,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:37,693 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 40 proven. 455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:28:37,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:37,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776356121] [2021-11-25 20:28:37,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776356121] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:37,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146680104] [2021-11-25 20:28:37,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:28:37,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:37,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:37,694 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:37,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:28:37,996 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:28:37,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:28:38,002 WARN L261 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 367 conjunts are in the unsatisfiable core [2021-11-25 20:28:38,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:58,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:28:58,118 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:28:58,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2021-11-25 20:28:58,478 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:28:58,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:43,978 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-25 20:29:43,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 905 [2021-11-25 20:30:04,692 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-25 20:30:04,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 60 [2021-11-25 20:30:05,017 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:30:05,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146680104] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:05,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [833883952] [2021-11-25 20:30:05,018 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:30:05,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:05,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:05,019 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:05,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:05,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:05,054 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:05,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:05,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:05,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:05,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:05,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:05,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:05,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:05,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:05,154 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:05,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:05,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:05,415 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:07,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26366#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:07,322 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:07,323 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:07,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 96, 99] total 262 [2021-11-25 20:30:07,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475638107] [2021-11-25 20:30:07,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:07,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 262 states [2021-11-25 20:30:07,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:07,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2021-11-25 20:30:07,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1008, Invalid=70014, Unknown=0, NotChecked=0, Total=71022 [2021-11-25 20:30:07,330 INFO L87 Difference]: Start difference. First operand 115 states and 125 transitions. Second operand has 262 states, 262 states have (on average 1.0916030534351144) internal successors, (286), 262 states have internal predecessors, (286), 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 20:31:51,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:51,091 INFO L93 Difference]: Finished difference Result 452 states and 507 transitions. [2021-11-25 20:31:51,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2021-11-25 20:31:51,092 INFO L78 Accepts]: Start accepts. Automaton has has 262 states, 262 states have (on average 1.0916030534351144) internal successors, (286), 262 states have internal predecessors, (286), 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 114 [2021-11-25 20:31:51,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:51,094 INFO L225 Difference]: With dead ends: 452 [2021-11-25 20:31:51,094 INFO L226 Difference]: Without dead ends: 448 [2021-11-25 20:31:51,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 156 SyntacticMatches, 32 SemanticMatches, 378 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33064 ImplicationChecksByTransitivity, 141.9s TimeCoverageRelationStatistics Valid=3867, Invalid=140153, Unknown=0, NotChecked=0, Total=144020 [2021-11-25 20:31:51,101 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 39 mSDsluCounter, 1020 mSDsCounter, 0 mSdLazyCounter, 37208 mSolverCounterSat, 1873 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 1021 SdHoareTripleChecker+Invalid, 39081 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1873 IncrementalHoareTripleChecker+Valid, 37208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:51,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 1021 Invalid, 39081 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1873 Valid, 37208 Invalid, 0 Unknown, 0 Unchecked, 36.9s Time] [2021-11-25 20:31:51,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2021-11-25 20:31:51,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 269. [2021-11-25 20:31:51,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.1082089552238805) internal successors, (297), 268 states have internal predecessors, (297), 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 20:31:51,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 297 transitions. [2021-11-25 20:31:51,256 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 297 transitions. Word has length 114 [2021-11-25 20:31:51,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:51,256 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 297 transitions. [2021-11-25 20:31:51,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 262 states, 262 states have (on average 1.0916030534351144) internal successors, (286), 262 states have internal predecessors, (286), 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 20:31:51,256 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 297 transitions. [2021-11-25 20:31:51,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 20:31:51,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:51,257 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:51,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:51,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:51,458 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:51,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:51,458 INFO L85 PathProgramCache]: Analyzing trace with hash 175405958, now seen corresponding path program 25 times [2021-11-25 20:31:51,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:51,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812558159] [2021-11-25 20:31:51,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:51,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:51,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:51,725 INFO L134 CoverageAnalysis]: Checked inductivity of 505 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-25 20:31:51,725 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:51,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812558159] [2021-11-25 20:31:51,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812558159] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:51,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982709804] [2021-11-25 20:31:51,725 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:31:51,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:51,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:51,727 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:51,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:31:51,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:51,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:31:51,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:52,318 INFO L134 CoverageAnalysis]: Checked inductivity of 505 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-25 20:31:52,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:52,492 INFO L134 CoverageAnalysis]: Checked inductivity of 505 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-25 20:31:52,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982709804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:52,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1682646430] [2021-11-25 20:31:52,493 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:31:52,493 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:52,493 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:52,493 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:52,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:52,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:52,527 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:52,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:52,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:52,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:31:52,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:52,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:52,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:52,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:52,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:52,597 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:52,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:52,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:52,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:53,089 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28735#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:53,089 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:53,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:53,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-25 20:31:53,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343412108] [2021-11-25 20:31:53,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:53,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:31:53,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:53,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:31:53,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:31:53,091 INFO L87 Difference]: Start difference. First operand 269 states and 297 transitions. Second operand has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 35 states have internal predecessors, (58), 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 20:31:53,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:53,829 INFO L93 Difference]: Finished difference Result 444 states and 488 transitions. [2021-11-25 20:31:53,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:31:53,829 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 35 states have internal predecessors, (58), 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 115 [2021-11-25 20:31:53,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:53,831 INFO L225 Difference]: With dead ends: 444 [2021-11-25 20:31:53,831 INFO L226 Difference]: Without dead ends: 198 [2021-11-25 20:31:53,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:31:53,832 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 888 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:53,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 1097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 888 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:31:53,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-25 20:31:54,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2021-11-25 20:31:54,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 197 states have (on average 1.101522842639594) internal successors, (217), 197 states have internal predecessors, (217), 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 20:31:54,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 217 transitions. [2021-11-25 20:31:54,043 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 217 transitions. Word has length 115 [2021-11-25 20:31:54,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:54,043 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 217 transitions. [2021-11-25 20:31:54,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 35 states have internal predecessors, (58), 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 20:31:54,044 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 217 transitions. [2021-11-25 20:31:54,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-25 20:31:54,045 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:54,045 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:54,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:54,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 20:31:54,267 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:54,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:54,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1452190127, now seen corresponding path program 26 times [2021-11-25 20:31:54,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:54,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978986874] [2021-11-25 20:31:54,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:54,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:54,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:54,532 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 415 trivial. 0 not checked. [2021-11-25 20:31:54,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:54,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978986874] [2021-11-25 20:31:54,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978986874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:54,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191762074] [2021-11-25 20:31:54,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:31:54,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:54,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:54,543 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:54,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:31:54,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:31:54,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:54,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:31:54,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:55,283 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 415 trivial. 0 not checked. [2021-11-25 20:31:55,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:55,443 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 415 trivial. 0 not checked. [2021-11-25 20:31:55,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191762074] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:55,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1237683727] [2021-11-25 20:31:55,444 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-25 20:31:55,444 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:55,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:55,444 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:55,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:55,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,505 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:55,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:55,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,542 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:55,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:55,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:55,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:55,618 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:55,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:55,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:55,884 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:56,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30765#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:56,080 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:56,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:56,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-11-25 20:31:56,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662591781] [2021-11-25 20:31:56,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:56,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:31:56,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:56,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:31:56,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1988, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:31:56,084 INFO L87 Difference]: Start difference. First operand 198 states and 217 transitions. Second operand has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 44 states have internal predecessors, (92), 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 20:31:56,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:56,816 INFO L93 Difference]: Finished difference Result 291 states and 327 transitions. [2021-11-25 20:31:56,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:31:56,817 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 44 states have internal predecessors, (92), 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 116 [2021-11-25 20:31:56,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:56,817 INFO L225 Difference]: With dead ends: 291 [2021-11-25 20:31:56,818 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 20:31:56,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 331 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1147 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=696, Invalid=2964, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:31:56,819 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 719 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 719 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:56,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 13 Invalid, 1615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [719 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:31:56,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 20:31:56,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-11-25 20:31:56,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.088) internal successors, (136), 125 states have internal predecessors, (136), 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 20:31:56,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 136 transitions. [2021-11-25 20:31:56,893 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 136 transitions. Word has length 116 [2021-11-25 20:31:56,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:56,893 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 136 transitions. [2021-11-25 20:31:56,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 44 states have internal predecessors, (92), 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 20:31:56,893 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 136 transitions. [2021-11-25 20:31:56,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 20:31:56,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:56,894 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:56,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:57,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 20:31:57,094 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:57,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:57,095 INFO L85 PathProgramCache]: Analyzing trace with hash 956022997, now seen corresponding path program 27 times [2021-11-25 20:31:57,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:57,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974922687] [2021-11-25 20:31:57,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:57,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:58,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:22,388 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 77 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:22,388 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:22,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974922687] [2021-11-25 20:32:22,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974922687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:22,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887475361] [2021-11-25 20:32:22,389 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:22,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:22,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:22,390 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:22,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fc944f4-fcd6-4970-9d60-c894977fa3bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 20:32:22,848 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:22,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:22,854 WARN L261 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 407 conjunts are in the unsatisfiable core [2021-11-25 20:32:22,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:48,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:48,257 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:48,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2021-11-25 20:32:48,665 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 550 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:32:48,665 INFO L328 TraceCheckSpWp]: Computing backward predicates...