./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V --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 aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:23:49,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:23:49,099 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:23:49,150 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:23:49,151 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:23:49,155 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:23:49,158 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:23:49,161 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:23:49,164 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:23:49,170 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:23:49,171 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:23:49,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:23:49,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:23:49,178 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:23:49,180 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:23:49,186 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:23:49,188 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:23:49,189 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:23:49,192 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:23:49,201 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:23:49,203 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:23:49,205 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:23:49,209 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:23:49,210 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:23:49,220 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:23:49,221 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:23:49,221 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:23:49,224 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:23:49,225 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:23:49,226 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:23:49,227 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:23:49,229 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:23:49,231 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:23:49,233 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:23:49,234 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:23:49,235 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:23:49,236 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:23:49,236 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:23:49,237 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:23:49,238 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:23:49,239 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:23:49,240 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:23:49,290 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:23:49,290 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:23:49,291 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:23:49,292 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:23:49,300 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:23:49,300 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:23:49,301 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:23:49,301 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:23:49,301 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:23:49,302 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:23:49,303 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:23:49,303 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:23:49,304 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:23:49,304 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:23:49,304 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:23:49,305 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:23:49,305 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:23:49,305 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:23:49,307 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:23:49,307 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:23:49,308 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:23:49,308 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:23:49,308 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:23:49,309 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:23:49,309 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:23:49,309 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:23:49,311 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:23:49,311 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:23:49,312 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:23:49,312 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:23:49,312 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:23:49,313 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:23:49,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:23:49,314 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:23:49,314 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:23:49,314 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:23:49,314 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:23:49,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:23:49,315 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:23:49,315 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:23:49,316 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:23:49,316 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_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 [2021-11-23 03:23:49,589 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:23:49,625 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:23:49,627 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:23:49,628 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:23:49,629 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:23:49,630 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2021-11-23 03:23:49,696 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/data/d4a30b74d/31f1ea050eb74a2b9bf383b1d0e4a65d/FLAG6e8975eac [2021-11-23 03:23:50,239 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:23:50,240 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2021-11-23 03:23:50,250 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/data/d4a30b74d/31f1ea050eb74a2b9bf383b1d0e4a65d/FLAG6e8975eac [2021-11-23 03:23:50,600 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/data/d4a30b74d/31f1ea050eb74a2b9bf383b1d0e4a65d [2021-11-23 03:23:50,604 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:23:50,606 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:23:50,610 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:23:50,611 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:23:50,615 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:23:50,617 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:23:50" (1/1) ... [2021-11-23 03:23:50,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8024ad4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:50, skipping insertion in model container [2021-11-23 03:23:50,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:23:50" (1/1) ... [2021-11-23 03:23:50,635 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:23:50,660 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:23:50,888 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_4aab2f67-69ec-439f-933e-afd90777ab04/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2021-11-23 03:23:50,950 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:23:50,959 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:23:50,976 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_4aab2f67-69ec-439f-933e-afd90777ab04/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2021-11-23 03:23:51,007 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:23:51,022 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:23:51,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51 WrapperNode [2021-11-23 03:23:51,023 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:23:51,024 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:23:51,024 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:23:51,024 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:23:51,033 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,042 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,066 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 126 [2021-11-23 03:23:51,067 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:23:51,068 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:23:51,068 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:23:51,068 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:23:51,079 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,079 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,081 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,082 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,088 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,093 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,094 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,097 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:23:51,098 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:23:51,098 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:23:51,098 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:23:51,099 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (1/1) ... [2021-11-23 03:23:51,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:23:51,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:51,145 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:23:51,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:23:51,185 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:23:51,186 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:23:51,186 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 03:23:51,186 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:23:51,186 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:23:51,186 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:23:51,186 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 03:23:51,279 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:23:51,281 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:23:51,599 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:23:51,652 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:23:51,656 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-23 03:23:51,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:23:51 BoogieIcfgContainer [2021-11-23 03:23:51,660 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:23:51,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:23:51,664 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:23:51,668 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:23:51,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:23:50" (1/3) ... [2021-11-23 03:23:51,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e19603 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:23:51, skipping insertion in model container [2021-11-23 03:23:51,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:23:51" (2/3) ... [2021-11-23 03:23:51,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e19603 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:23:51, skipping insertion in model container [2021-11-23 03:23:51,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:23:51" (3/3) ... [2021-11-23 03:23:51,672 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m4.c [2021-11-23 03:23:51,678 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:23:51,678 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:23:51,745 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:23:51,757 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 [2021-11-23 03:23:51,757 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:23:51,781 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) 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) [2021-11-23 03:23:51,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:23:51,790 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:51,791 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:51,792 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:51,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:51,798 INFO L85 PathProgramCache]: Analyzing trace with hash -2021895563, now seen corresponding path program 1 times [2021-11-23 03:23:51,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:51,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918398050] [2021-11-23 03:23:51,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:51,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:51,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:52,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:52,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:52,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918398050] [2021-11-23 03:23:52,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918398050] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:52,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:52,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:52,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445853145] [2021-11-23 03:23:52,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:52,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:23:52,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:52,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:23:52,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:52,100 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) 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) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-11-23 03:23:52,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:52,188 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2021-11-23 03:23:52,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:23:52,191 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 13 [2021-11-23 03:23:52,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:52,199 INFO L225 Difference]: With dead ends: 32 [2021-11-23 03:23:52,199 INFO L226 Difference]: Without dead ends: 15 [2021-11-23 03:23:52,202 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 [2021-11-23 03:23:52,209 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:52,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:23:52,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-23 03:23:52,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-23 03:23:52,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 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) [2021-11-23 03:23:52,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2021-11-23 03:23:52,248 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2021-11-23 03:23:52,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:52,248 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2021-11-23 03:23:52,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-11-23 03:23:52,250 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2021-11-23 03:23:52,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 03:23:52,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:52,252 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:52,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:23:52,254 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:52,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:52,256 INFO L85 PathProgramCache]: Analyzing trace with hash 688320013, now seen corresponding path program 1 times [2021-11-23 03:23:52,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:52,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207716769] [2021-11-23 03:23:52,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:52,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:52,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:52,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:52,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:52,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207716769] [2021-11-23 03:23:52,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207716769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:52,368 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:52,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:23:52,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493254347] [2021-11-23 03:23:52,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:52,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:52,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:52,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:52,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:52,373 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-11-23 03:23:52,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:52,485 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2021-11-23 03:23:52,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:52,486 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 14 [2021-11-23 03:23:52,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:52,489 INFO L225 Difference]: With dead ends: 33 [2021-11-23 03:23:52,489 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 03:23:52,491 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 [2021-11-23 03:23:52,494 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:52,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 5 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:23:52,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 03:23:52,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-23 03:23:52,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 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) [2021-11-23 03:23:52,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-11-23 03:23:52,513 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2021-11-23 03:23:52,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:52,515 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-11-23 03:23:52,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-11-23 03:23:52,517 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-11-23 03:23:52,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 03:23:52,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:52,522 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] [2021-11-23 03:23:52,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:23:52,523 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:52,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:52,524 INFO L85 PathProgramCache]: Analyzing trace with hash -628182144, now seen corresponding path program 1 times [2021-11-23 03:23:52,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:52,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436028333] [2021-11-23 03:23:52,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:52,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:52,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:52,649 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:23:52,649 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:52,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436028333] [2021-11-23 03:23:52,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436028333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:52,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681682385] [2021-11-23 03:23:52,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:52,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:52,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:52,653 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:52,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:23:52,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:52,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:23:52,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:52,909 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:23:52,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:53,001 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:23:53,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681682385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:53,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029518734] [2021-11-23 03:23:53,034 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:23:53,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:23:53,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:23:53,046 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:23:53,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:23:53,270 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:23:53,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:23:53,297 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 [2021-11-23 03:23:53,363 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 [2021-11-23 03:23:53,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:53,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:53,561 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:23:53,562 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 241 treesize of output 244 [2021-11-23 03:23:53,738 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 [2021-11-23 03:23:54,297 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:23:54,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:23:54,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:23:54,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:23:54,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-23 03:23:54,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101092627] [2021-11-23 03:23:54,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:54,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:23:54,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:54,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:23:54,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:23:54,780 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) [2021-11-23 03:23:54,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:54,879 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2021-11-23 03:23:54,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:54,881 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-23 03:23:54,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:54,882 INFO L225 Difference]: With dead ends: 43 [2021-11-23 03:23:54,882 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 03:23:54,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 43 SyntacticMatches, 15 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:23:54,888 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:54,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:23:54,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 03:23:54,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 03:23:54,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 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) [2021-11-23 03:23:54,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-23 03:23:54,905 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2021-11-23 03:23:54,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:54,906 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-23 03:23:54,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) [2021-11-23 03:23:54,908 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-23 03:23:54,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 03:23:54,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:54,911 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] [2021-11-23 03:23:54,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:55,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:55,133 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:55,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:55,134 INFO L85 PathProgramCache]: Analyzing trace with hash -681729304, now seen corresponding path program 2 times [2021-11-23 03:23:55,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:55,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080341069] [2021-11-23 03:23:55,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:55,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:55,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:55,190 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:23:55,190 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:55,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080341069] [2021-11-23 03:23:55,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080341069] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:55,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465651634] [2021-11-23 03:23:55,191 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:23:55,191 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:55,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:55,192 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:55,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:23:55,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:23:55,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:55,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:23:55,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:55,341 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:23:55,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:23:55,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465651634] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:55,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301294367] [2021-11-23 03:23:55,416 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:23:55,416 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:23:55,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:23:55,417 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:23:55,417 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:23:55,502 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:23:55,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:23:55,517 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 [2021-11-23 03:23:55,558 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 [2021-11-23 03:23:55,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:23:55,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:23:55,671 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:23:55,671 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 241 treesize of output 244 [2021-11-23 03:23:55,792 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 [2021-11-23 03:23:56,156 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:23:56,483 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:23:56,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:23:56,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:23:56,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-23 03:23:56,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414200480] [2021-11-23 03:23:56,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:56,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:23:56,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:56,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:23:56,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:23:56,486 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 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) [2021-11-23 03:23:56,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:56,570 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2021-11-23 03:23:56,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:23:56,571 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 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 23 [2021-11-23 03:23:56,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:56,572 INFO L225 Difference]: With dead ends: 49 [2021-11-23 03:23:56,572 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 03:23:56,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 45 SyntacticMatches, 16 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:23:56,573 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:56,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 5 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:23:56,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 03:23:56,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-23 03:23:56,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 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) [2021-11-23 03:23:56,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-23 03:23:56,580 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2021-11-23 03:23:56,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:56,580 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-23 03:23:56,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 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) [2021-11-23 03:23:56,580 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-23 03:23:56,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 03:23:56,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:56,581 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:56,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:56,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:56,804 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:56,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:56,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1504251819, now seen corresponding path program 3 times [2021-11-23 03:23:56,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:56,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899077865] [2021-11-23 03:23:56,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:56,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:56,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:58,295 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:58,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:58,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899077865] [2021-11-23 03:23:58,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899077865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:23:58,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134330223] [2021-11-23 03:23:58,296 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:23:58,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:58,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:58,298 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:58,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:23:58,369 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:23:58,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:58,371 WARN L261 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-23 03:23:58,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:59,618 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:59,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:01,286 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-23 03:24:01,287 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 51 [2021-11-23 03:24:01,391 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-23 03:24:01,391 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 18 [2021-11-23 03:24:01,482 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:24:01,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134330223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:01,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1048020029] [2021-11-23 03:24:01,485 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:01,485 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:01,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:01,486 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:01,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:01,544 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:24:01,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:24:01,602 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:01,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:01,648 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 [2021-11-23 03:24:01,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:01,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:01,763 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:24:01,764 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 241 treesize of output 244 [2021-11-23 03:24:01,864 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 [2021-11-23 03:24:02,166 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:04,054 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '998#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:04,054 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:04,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:04,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 24] total 62 [2021-11-23 03:24:04,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43666125] [2021-11-23 03:24:04,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:04,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-23 03:24:04,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:04,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-23 03:24:04,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=4204, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 03:24:04,060 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 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) [2021-11-23 03:24:05,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:05,493 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2021-11-23 03:24:05,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 03:24:05,494 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 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 31 [2021-11-23 03:24:05,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:05,496 INFO L225 Difference]: With dead ends: 57 [2021-11-23 03:24:05,496 INFO L226 Difference]: Without dead ends: 54 [2021-11-23 03:24:05,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 29 SyntacticMatches, 27 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2250 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=265, Invalid=5435, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 03:24:05,500 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 1130 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:05,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 61 Invalid, 1141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1130 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:24:05,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-23 03:24:05,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2021-11-23 03:24:05,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 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) [2021-11-23 03:24:05,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-23 03:24:05,512 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2021-11-23 03:24:05,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:05,512 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-23 03:24:05,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 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) [2021-11-23 03:24:05,513 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-23 03:24:05,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 03:24:05,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:05,514 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:05,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:05,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:05,740 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:05,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:05,741 INFO L85 PathProgramCache]: Analyzing trace with hash -2090822180, now seen corresponding path program 4 times [2021-11-23 03:24:05,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:05,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135460295] [2021-11-23 03:24:05,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:05,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:05,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:05,820 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:24:05,821 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:05,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135460295] [2021-11-23 03:24:05,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135460295] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:05,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377230396] [2021-11-23 03:24:05,821 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:24:05,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:05,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:05,826 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:05,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:24:05,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:05,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:24:05,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:06,005 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:24:06,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:06,069 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:24:06,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377230396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:06,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914926491] [2021-11-23 03:24:06,072 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:06,073 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:06,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:06,073 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:06,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:06,133 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:24:06,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:24:06,190 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:06,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:06,222 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 [2021-11-23 03:24:06,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:06,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:06,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:06,300 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:24:06,301 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 246 treesize of output 243 [2021-11-23 03:24:06,354 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 [2021-11-23 03:24:06,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:06,816 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1426#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:06,817 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:06,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:06,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-23 03:24:06,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597970484] [2021-11-23 03:24:06,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:06,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:24:06,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:06,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:24:06,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:24:06,819 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:07,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:07,063 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2021-11-23 03:24:07,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:24:07,064 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-23 03:24:07,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:07,065 INFO L225 Difference]: With dead ends: 114 [2021-11-23 03:24:07,065 INFO L226 Difference]: Without dead ends: 65 [2021-11-23 03:24:07,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:24:07,067 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:07,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:24:07,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-23 03:24:07,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-11-23 03:24:07,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.263157894736842) internal successors, (72), 57 states have internal predecessors, (72), 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) [2021-11-23 03:24:07,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2021-11-23 03:24:07,076 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 32 [2021-11-23 03:24:07,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:07,076 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2021-11-23 03:24:07,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:07,076 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2021-11-23 03:24:07,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:24:07,077 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:07,078 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:07,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:07,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:07,292 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:07,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:07,293 INFO L85 PathProgramCache]: Analyzing trace with hash 293731444, now seen corresponding path program 5 times [2021-11-23 03:24:07,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:07,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510846659] [2021-11-23 03:24:07,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:07,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:07,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:07,370 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:24:07,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:07,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510846659] [2021-11-23 03:24:07,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510846659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:07,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262751273] [2021-11-23 03:24:07,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:24:07,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:07,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:07,389 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:07,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:24:07,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:24:07,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:07,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:24:07,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:07,556 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:24:07,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:07,636 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:24:07,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262751273] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:07,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829291594] [2021-11-23 03:24:07,639 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:07,640 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:07,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:07,640 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:07,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:07,699 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:07,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:07,710 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 [2021-11-23 03:24:07,733 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 [2021-11-23 03:24:07,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:07,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:07,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:07,804 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:24:07,805 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 246 treesize of output 243 [2021-11-23 03:24:07,854 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 [2021-11-23 03:24:08,139 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:08,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1968#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:08,313 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:08,313 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:08,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-23 03:24:08,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118827864] [2021-11-23 03:24:08,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:08,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:24:08,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:08,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:24:08,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:24:08,315 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:08,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:08,516 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2021-11-23 03:24:08,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:24:08,519 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-23 03:24:08,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:08,520 INFO L225 Difference]: With dead ends: 62 [2021-11-23 03:24:08,520 INFO L226 Difference]: Without dead ends: 41 [2021-11-23 03:24:08,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:24:08,521 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:08,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:24:08,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-23 03:24:08,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-23 03:24:08,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 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) [2021-11-23 03:24:08,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-11-23 03:24:08,528 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2021-11-23 03:24:08,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:08,529 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-11-23 03:24:08,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:08,529 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-11-23 03:24:08,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 03:24:08,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:08,530 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:08,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:08,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:08,756 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:08,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:08,757 INFO L85 PathProgramCache]: Analyzing trace with hash 487958048, now seen corresponding path program 6 times [2021-11-23 03:24:08,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:08,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451794205] [2021-11-23 03:24:08,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:08,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:09,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:11,791 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:11,792 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:11,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451794205] [2021-11-23 03:24:11,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451794205] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:11,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243121632] [2021-11-23 03:24:11,792 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:24:11,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:11,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:11,796 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:11,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:24:11,857 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:24:11,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:11,860 WARN L261 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-23 03:24:11,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:13,949 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:13,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:17,387 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-23 03:24:17,388 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 [2021-11-23 03:24:17,648 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-23 03:24:17,654 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 [2021-11-23 03:24:17,783 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:24:17,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1243121632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:17,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1898540264] [2021-11-23 03:24:17,786 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:17,787 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:17,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:17,787 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:17,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:17,860 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:17,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:17,874 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 [2021-11-23 03:24:17,904 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 [2021-11-23 03:24:17,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:17,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:17,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:18,001 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:24:18,002 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 246 treesize of output 243 [2021-11-23 03:24:18,058 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 [2021-11-23 03:24:18,265 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:18,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2503#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:18,906 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:18,906 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:18,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 93 [2021-11-23 03:24:18,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202524154] [2021-11-23 03:24:18,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:18,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-23 03:24:18,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:18,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-23 03:24:18,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=9197, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 03:24:18,913 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 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) [2021-11-23 03:24:25,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:25,862 INFO L93 Difference]: Finished difference Result 83 states and 104 transitions. [2021-11-23 03:24:25,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 03:24:25,863 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 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 40 [2021-11-23 03:24:25,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:25,864 INFO L225 Difference]: With dead ends: 83 [2021-11-23 03:24:25,864 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 03:24:25,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3502 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=613, Invalid=16679, Unknown=0, NotChecked=0, Total=17292 [2021-11-23 03:24:25,870 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 2926 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 3047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 2926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:25,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 246 Invalid, 3047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 2926 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 03:24:25,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 03:24:25,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 67. [2021-11-23 03:24:25,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2424242424242424) internal successors, (82), 66 states have internal predecessors, (82), 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) [2021-11-23 03:24:25,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 82 transitions. [2021-11-23 03:24:25,882 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 82 transitions. Word has length 40 [2021-11-23 03:24:25,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:25,882 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 82 transitions. [2021-11-23 03:24:25,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 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) [2021-11-23 03:24:25,883 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 82 transitions. [2021-11-23 03:24:25,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:24:25,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:25,884 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:25,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:26,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:26,096 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:26,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:26,097 INFO L85 PathProgramCache]: Analyzing trace with hash 1986766039, now seen corresponding path program 7 times [2021-11-23 03:24:26,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:26,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387587778] [2021-11-23 03:24:26,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:26,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:26,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:26,198 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:24:26,199 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:26,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387587778] [2021-11-23 03:24:26,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387587778] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:26,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115509814] [2021-11-23 03:24:26,199 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:24:26,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:26,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:26,201 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:26,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:24:26,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:26,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:24:26,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:26,424 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:24:26,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:26,516 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:24:26,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115509814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:26,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [388887177] [2021-11-23 03:24:26,519 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:26,519 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:26,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:26,520 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:26,520 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:26,586 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:26,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:26,601 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 [2021-11-23 03:24:26,622 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 [2021-11-23 03:24:26,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:26,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:26,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:26,708 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:24:26,709 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 246 treesize of output 243 [2021-11-23 03:24:26,755 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 [2021-11-23 03:24:27,019 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:27,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3117#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:27,711 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:27,711 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:27,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-23 03:24:27,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827674129] [2021-11-23 03:24:27,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:27,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 03:24:27,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:27,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 03:24:27,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:24:27,713 INFO L87 Difference]: Start difference. First operand 67 states and 82 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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) [2021-11-23 03:24:28,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:28,066 INFO L93 Difference]: Finished difference Result 144 states and 179 transitions. [2021-11-23 03:24:28,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:24:28,066 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 41 [2021-11-23 03:24:28,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:28,068 INFO L225 Difference]: With dead ends: 144 [2021-11-23 03:24:28,068 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 03:24:28,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 83 SyntacticMatches, 29 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:24:28,069 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:28,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 15 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:24:28,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 03:24:28,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-11-23 03:24:28,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 72 states have internal predecessors, (87), 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) [2021-11-23 03:24:28,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-23 03:24:28,084 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 41 [2021-11-23 03:24:28,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:28,084 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-23 03:24:28,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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) [2021-11-23 03:24:28,085 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-23 03:24:28,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 03:24:28,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:28,087 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:28,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:28,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 03:24:28,300 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:28,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:28,301 INFO L85 PathProgramCache]: Analyzing trace with hash 96542015, now seen corresponding path program 8 times [2021-11-23 03:24:28,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:28,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845451022] [2021-11-23 03:24:28,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:28,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:28,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:28,403 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:24:28,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:28,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845451022] [2021-11-23 03:24:28,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845451022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:28,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024517813] [2021-11-23 03:24:28,404 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:24:28,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:28,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:28,408 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:28,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:24:28,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:24:28,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:28,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:24:28,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:28,651 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:24:28,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:28,754 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:24:28,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024517813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:28,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722056016] [2021-11-23 03:24:28,757 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:28,757 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:28,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:28,758 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:28,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:28,819 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:28,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:28,831 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 [2021-11-23 03:24:28,850 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 [2021-11-23 03:24:28,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:28,903 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:28,928 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:24:28,928 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 241 treesize of output 244 [2021-11-23 03:24:29,006 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 [2021-11-23 03:24:29,223 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:29,746 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3808#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:29,746 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:29,746 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:29,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-23 03:24:29,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163310500] [2021-11-23 03:24:29,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:29,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 03:24:29,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:29,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 03:24:29,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:24:29,748 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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) [2021-11-23 03:24:30,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:30,020 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-11-23 03:24:30,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:24:30,021 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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 42 [2021-11-23 03:24:30,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:30,021 INFO L225 Difference]: With dead ends: 77 [2021-11-23 03:24:30,021 INFO L226 Difference]: Without dead ends: 50 [2021-11-23 03:24:30,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 85 SyntacticMatches, 30 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:24:30,022 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:30,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 15 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:24:30,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-23 03:24:30,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-23 03:24:30,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 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) [2021-11-23 03:24:30,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2021-11-23 03:24:30,032 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2021-11-23 03:24:30,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:30,032 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2021-11-23 03:24:30,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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) [2021-11-23 03:24:30,033 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2021-11-23 03:24:30,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 03:24:30,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:30,035 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:30,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:30,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:24:30,248 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:30,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:30,249 INFO L85 PathProgramCache]: Analyzing trace with hash 174183989, now seen corresponding path program 9 times [2021-11-23 03:24:30,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:30,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757394305] [2021-11-23 03:24:30,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:30,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:30,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:34,914 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:34,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:34,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757394305] [2021-11-23 03:24:34,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757394305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:34,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430334305] [2021-11-23 03:24:34,915 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:24:34,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:34,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:34,917 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:34,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:24:34,975 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:24:34,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:34,977 WARN L261 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 143 conjunts are in the unsatisfiable core [2021-11-23 03:24:34,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:38,097 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:38,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:43,729 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-23 03:24:43,730 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 185 [2021-11-23 03:24:44,490 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-23 03:24:44,490 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 30 [2021-11-23 03:24:44,634 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:24:44,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430334305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:44,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1558348763] [2021-11-23 03:24:44,637 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:24:44,637 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:44,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:44,638 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:44,638 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:44,705 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:24:44,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:24:44,721 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 [2021-11-23 03:24:44,747 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 [2021-11-23 03:24:44,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:44,805 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:44,827 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:24:44,827 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 241 treesize of output 244 [2021-11-23 03:24:44,911 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 [2021-11-23 03:24:45,143 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:24:46,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4473#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:24:46,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:24:46,166 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:24:46,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 40, 40] total 119 [2021-11-23 03:24:46,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689008855] [2021-11-23 03:24:46,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:46,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-23 03:24:46,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:46,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-23 03:24:46,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=14847, Unknown=0, NotChecked=0, Total=15252 [2021-11-23 03:24:46,177 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 119 states, 119 states have (on average 1.1428571428571428) internal successors, (136), 119 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) [2021-11-23 03:25:07,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:25:07,213 INFO L93 Difference]: Finished difference Result 181 states and 218 transitions. [2021-11-23 03:25:07,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-23 03:25:07,213 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.1428571428571428) internal successors, (136), 119 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) Word has length 49 [2021-11-23 03:25:07,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:25:07,215 INFO L225 Difference]: With dead ends: 181 [2021-11-23 03:25:07,215 INFO L226 Difference]: Without dead ends: 141 [2021-11-23 03:25:07,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8285 ImplicationChecksByTransitivity, 27.6s TimeCoverageRelationStatistics Valid=1576, Invalid=34714, Unknown=0, NotChecked=0, Total=36290 [2021-11-23 03:25:07,221 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 110 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 6420 mSolverCounterSat, 622 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 7042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 622 IncrementalHoareTripleChecker+Valid, 6420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:25:07,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 167 Invalid, 7042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [622 Valid, 6420 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 03:25:07,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-23 03:25:07,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 95. [2021-11-23 03:25:07,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.1914893617021276) internal successors, (112), 94 states have internal predecessors, (112), 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) [2021-11-23 03:25:07,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2021-11-23 03:25:07,244 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 49 [2021-11-23 03:25:07,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:25:07,244 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2021-11-23 03:25:07,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.1428571428571428) internal successors, (136), 119 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) [2021-11-23 03:25:07,245 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2021-11-23 03:25:07,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 03:25:07,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:25:07,247 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:25:07,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:25:07,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:07,460 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:25:07,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:25:07,461 INFO L85 PathProgramCache]: Analyzing trace with hash -2097607514, now seen corresponding path program 10 times [2021-11-23 03:25:07,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:25:07,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804828801] [2021-11-23 03:25:07,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:25:07,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:25:07,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:07,590 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-23 03:25:07,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:25:07,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804828801] [2021-11-23 03:25:07,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804828801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:25:07,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003215287] [2021-11-23 03:25:07,591 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:25:07,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:07,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:25:07,593 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:25:07,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:25:07,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:07,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:25:07,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:25:07,882 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-23 03:25:07,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:25:07,991 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-23 03:25:07,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003215287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:25:07,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2067534071] [2021-11-23 03:25:07,994 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:25:07,994 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:25:07,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:25:07,995 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:25:07,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:25:08,062 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:25:08,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:25:08,078 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 [2021-11-23 03:25:08,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 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 [2021-11-23 03:25:08,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:08,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:08,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:08,181 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:25:08,182 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 246 treesize of output 243 [2021-11-23 03:25:08,234 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 [2021-11-23 03:25:08,465 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:25:08,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5461#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:25:08,711 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:25:08,711 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:25:08,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-23 03:25:08,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344055590] [2021-11-23 03:25:08,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:25:08,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:25:08,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:25:08,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:25:08,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:25:08,713 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 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) [2021-11-23 03:25:09,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:25:09,105 INFO L93 Difference]: Finished difference Result 176 states and 209 transitions. [2021-11-23 03:25:09,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:25:09,105 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 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 [2021-11-23 03:25:09,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:25:09,106 INFO L225 Difference]: With dead ends: 176 [2021-11-23 03:25:09,107 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 03:25:09,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:25:09,109 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:25:09,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 19 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:25:09,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 03:25:09,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-11-23 03:25:09,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1666666666666667) internal successors, (84), 72 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) [2021-11-23 03:25:09,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2021-11-23 03:25:09,131 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 50 [2021-11-23 03:25:09,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:25:09,132 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2021-11-23 03:25:09,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 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) [2021-11-23 03:25:09,132 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2021-11-23 03:25:09,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 03:25:09,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:25:09,134 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:25:09,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:25:09,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:09,340 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:25:09,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:25:09,341 INFO L85 PathProgramCache]: Analyzing trace with hash -434568720, now seen corresponding path program 11 times [2021-11-23 03:25:09,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:25:09,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893019419] [2021-11-23 03:25:09,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:25:09,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:25:09,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:09,476 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:25:09,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:25:09,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893019419] [2021-11-23 03:25:09,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893019419] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:25:09,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370479525] [2021-11-23 03:25:09,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:25:09,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:09,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:25:09,480 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:25:09,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:25:09,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:25:09,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:25:09,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:25:09,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:25:09,769 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:25:09,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:25:09,893 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:25:09,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370479525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:25:09,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949361640] [2021-11-23 03:25:09,896 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:25:09,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:25:09,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:25:09,897 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:25:09,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:25:09,959 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:25:09,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 03:25:10,012 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:25:10,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:25:10,043 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 [2021-11-23 03:25:10,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:10,118 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:25:10,141 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:25:10,141 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 241 treesize of output 244 [2021-11-23 03:25:10,250 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 [2021-11-23 03:25:10,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:25:11,163 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6293#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:25:11,163 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:25:11,163 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:25:11,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-23 03:25:11,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977507469] [2021-11-23 03:25:11,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:25:11,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:25:11,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:25:11,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:25:11,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:25:11,165 INFO L87 Difference]: Start difference. First operand 73 states and 84 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 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) [2021-11-23 03:25:11,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:25:11,437 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2021-11-23 03:25:11,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:25:11,438 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 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 54 [2021-11-23 03:25:11,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:25:11,438 INFO L225 Difference]: With dead ends: 77 [2021-11-23 03:25:11,439 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 03:25:11,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 115 SyntacticMatches, 40 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:25:11,440 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:25:11,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:25:11,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 03:25:11,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-23 03:25:11,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 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) [2021-11-23 03:25:11,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-23 03:25:11,455 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 54 [2021-11-23 03:25:11,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:25:11,455 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-23 03:25:11,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 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) [2021-11-23 03:25:11,456 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-23 03:25:11,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 03:25:11,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:25:11,457 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:25:11,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:25:11,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:25:11,672 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:25:11,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:25:11,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1772327104, now seen corresponding path program 12 times [2021-11-23 03:25:11,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:25:11,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760659235] [2021-11-23 03:25:11,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:25:11,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:25:11,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:17,317 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 1 proven. 134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:25:17,317 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:25:17,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760659235] [2021-11-23 03:25:17,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760659235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:25:17,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848625747] [2021-11-23 03:25:17,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:25:17,318 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:17,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:25:17,319 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:25:17,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:25:17,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:25:17,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:25:17,387 WARN L261 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 177 conjunts are in the unsatisfiable core [2021-11-23 03:25:17,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:25:22,633 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:25:22,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:25:31,219 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-23 03:25:31,220 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 285 [2021-11-23 03:25:32,839 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-23 03:25:32,840 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 36 [2021-11-23 03:25:32,986 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:25:32,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848625747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:25:32,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2003677137] [2021-11-23 03:25:32,988 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:25:32,989 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:25:32,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:25:32,989 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:25:32,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:25:33,047 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:25:33,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:25:33,089 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:25:33,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:25:33,112 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 [2021-11-23 03:25:33,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:33,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:33,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:33,174 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:25:33,174 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 246 treesize of output 243 [2021-11-23 03:25:33,230 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 [2021-11-23 03:25:33,455 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:25:40,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7063#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:25:40,508 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:25:40,508 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:25:40,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 49, 48] total 145 [2021-11-23 03:25:40,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002508893] [2021-11-23 03:25:40,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:25:40,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-23 03:25:40,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:25:40,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-23 03:25:40,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=21830, Unknown=0, NotChecked=0, Total=22350 [2021-11-23 03:25:40,513 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 145 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 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) [2021-11-23 03:25:56,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:25:56,253 INFO L93 Difference]: Finished difference Result 115 states and 136 transitions. [2021-11-23 03:25:56,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-23 03:25:56,254 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 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 58 [2021-11-23 03:25:56,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:25:56,255 INFO L225 Difference]: With dead ends: 115 [2021-11-23 03:25:56,255 INFO L226 Difference]: Without dead ends: 112 [2021-11-23 03:25:56,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 35 SyntacticMatches, 46 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13254 ImplicationChecksByTransitivity, 34.2s TimeCoverageRelationStatistics Valid=1059, Invalid=38741, Unknown=0, NotChecked=0, Total=39800 [2021-11-23 03:25:56,259 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 5503 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 5715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 5503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:25:56,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 325 Invalid, 5715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 5503 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-23 03:25:56,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-23 03:25:56,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 97. [2021-11-23 03:25:56,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.1666666666666667) internal successors, (112), 96 states have internal predecessors, (112), 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) [2021-11-23 03:25:56,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 112 transitions. [2021-11-23 03:25:56,287 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 112 transitions. Word has length 58 [2021-11-23 03:25:56,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:25:56,287 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 112 transitions. [2021-11-23 03:25:56,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 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) [2021-11-23 03:25:56,288 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 112 transitions. [2021-11-23 03:25:56,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 03:25:56,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:25:56,289 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:25:56,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:25:56,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 03:25:56,504 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:25:56,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:25:56,505 INFO L85 PathProgramCache]: Analyzing trace with hash -2083679369, now seen corresponding path program 13 times [2021-11-23 03:25:56,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:25:56,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934479955] [2021-11-23 03:25:56,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:25:56,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:25:56,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:56,657 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 03:25:56,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:25:56,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934479955] [2021-11-23 03:25:56,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934479955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:25:56,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786683617] [2021-11-23 03:25:56,658 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:25:56,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:56,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:25:56,660 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:25:56,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:25:56,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:56,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:25:56,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:25:56,985 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 03:25:56,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:25:57,107 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 03:25:57,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786683617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:25:57,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016018727] [2021-11-23 03:25:57,109 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:25:57,109 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:25:57,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:25:57,109 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:25:57,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:25:57,163 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:25:57,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:25:57,208 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:25:57,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:25:57,251 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 [2021-11-23 03:25:57,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:57,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:57,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:57,328 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:25:57,328 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 246 treesize of output 243 [2021-11-23 03:25:57,375 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 [2021-11-23 03:25:57,578 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:25:57,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7947#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:25:57,778 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:25:57,778 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:25:57,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-23 03:25:57,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184415904] [2021-11-23 03:25:57,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:25:57,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 03:25:57,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:25:57,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 03:25:57,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:25:57,780 INFO L87 Difference]: Start difference. First operand 97 states and 112 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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) [2021-11-23 03:25:58,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:25:58,211 INFO L93 Difference]: Finished difference Result 204 states and 239 transitions. [2021-11-23 03:25:58,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:25:58,213 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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 [2021-11-23 03:25:58,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:25:58,214 INFO L225 Difference]: With dead ends: 204 [2021-11-23 03:25:58,214 INFO L226 Difference]: Without dead ends: 110 [2021-11-23 03:25:58,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=238, Invalid=884, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:25:58,215 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:25:58,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 19 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:25:58,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-23 03:25:58,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 103. [2021-11-23 03:25:58,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.1470588235294117) internal successors, (117), 102 states have internal predecessors, (117), 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) [2021-11-23 03:25:58,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 117 transitions. [2021-11-23 03:25:58,235 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 117 transitions. Word has length 59 [2021-11-23 03:25:58,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:25:58,235 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 117 transitions. [2021-11-23 03:25:58,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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) [2021-11-23 03:25:58,236 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 117 transitions. [2021-11-23 03:25:58,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:25:58,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:25:58,236 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:25:58,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:25:58,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:58,437 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:25:58,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:25:58,438 INFO L85 PathProgramCache]: Analyzing trace with hash -652498465, now seen corresponding path program 14 times [2021-11-23 03:25:58,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:25:58,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672153150] [2021-11-23 03:25:58,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:25:58,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:25:58,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:25:58,591 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-23 03:25:58,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:25:58,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672153150] [2021-11-23 03:25:58,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672153150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:25:58,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136064916] [2021-11-23 03:25:58,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:25:58,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:25:58,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:25:58,597 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:25:58,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:25:58,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:25:58,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:25:58,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:25:58,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:25:59,005 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-23 03:25:59,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:25:59,159 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-23 03:25:59,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136064916] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:25:59,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [920853566] [2021-11-23 03:25:59,161 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:25:59,161 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:25:59,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:25:59,162 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:25:59,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:25:59,210 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:25:59,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:25:59,219 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 [2021-11-23 03:25:59,238 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 [2021-11-23 03:25:59,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:59,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:59,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:25:59,308 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:25:59,308 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 246 treesize of output 243 [2021-11-23 03:25:59,356 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 [2021-11-23 03:25:59,598 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:26:00,586 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8936#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:26:00,587 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:26:00,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:26:00,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-23 03:26:00,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075356189] [2021-11-23 03:26:00,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:26:00,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 03:26:00,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:26:00,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 03:26:00,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:26:00,590 INFO L87 Difference]: Start difference. First operand 103 states and 117 transitions. Second operand has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 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) [2021-11-23 03:26:00,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:26:00,996 INFO L93 Difference]: Finished difference Result 107 states and 121 transitions. [2021-11-23 03:26:00,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 03:26:00,997 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 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 60 [2021-11-23 03:26:00,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:26:00,997 INFO L225 Difference]: With dead ends: 107 [2021-11-23 03:26:00,998 INFO L226 Difference]: Without dead ends: 68 [2021-11-23 03:26:00,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 123 SyntacticMatches, 44 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1496 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:26:00,999 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:26:00,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:26:01,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-23 03:26:01,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-23 03:26:01,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 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) [2021-11-23 03:26:01,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2021-11-23 03:26:01,015 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2021-11-23 03:26:01,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:26:01,015 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2021-11-23 03:26:01,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 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) [2021-11-23 03:26:01,016 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2021-11-23 03:26:01,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 03:26:01,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:26:01,016 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:26:01,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:26:01,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:26:01,217 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:26:01,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:26:01,217 INFO L85 PathProgramCache]: Analyzing trace with hash 1455883285, now seen corresponding path program 15 times [2021-11-23 03:26:01,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:26:01,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015514555] [2021-11-23 03:26:01,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:26:01,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:26:01,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:26:09,848 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 7 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:26:09,848 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:26:09,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015514555] [2021-11-23 03:26:09,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015514555] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:26:09,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617046407] [2021-11-23 03:26:09,849 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:26:09,849 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:26:09,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:26:09,850 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:26:09,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:26:09,934 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:26:09,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:26:09,939 WARN L261 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 211 conjunts are in the unsatisfiable core [2021-11-23 03:26:09,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:26:17,596 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 188 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:26:17,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:26:27,550 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-23 03:26:27,550 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 [2021-11-23 03:26:30,538 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-23 03:26:30,538 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 [2021-11-23 03:26:30,750 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:26:30,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617046407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:26:30,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [472976736] [2021-11-23 03:26:30,752 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:26:30,753 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:26:30,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:26:30,753 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:26:30,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:26:30,815 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:26:30,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:26:30,873 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:26:30,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:26:30,897 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 [2021-11-23 03:26:31,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:26:31,002 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:26:31,022 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:26:31,022 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 241 treesize of output 244 [2021-11-23 03:26:31,084 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 [2021-11-23 03:26:31,274 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:26:32,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9861#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:26:32,135 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:26:32,135 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:26:32,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 58, 56] total 171 [2021-11-23 03:26:32,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308081224] [2021-11-23 03:26:32,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:26:32,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 171 states [2021-11-23 03:26:32,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:26:32,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 171 interpolants. [2021-11-23 03:26:32,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=30041, Unknown=0, NotChecked=0, Total=30800 [2021-11-23 03:26:32,139 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 171 states, 171 states have (on average 1.0994152046783625) internal successors, (188), 171 states have internal predecessors, (188), 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) [2021-11-23 03:27:13,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:13,824 INFO L93 Difference]: Finished difference Result 316 states and 364 transitions. [2021-11-23 03:27:13,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2021-11-23 03:27:13,825 INFO L78 Accepts]: Start accepts. Automaton has has 171 states, 171 states have (on average 1.0994152046783625) internal successors, (188), 171 states have internal predecessors, (188), 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 67 [2021-11-23 03:27:13,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:13,828 INFO L225 Difference]: With dead ends: 316 [2021-11-23 03:27:13,828 INFO L226 Difference]: Without dead ends: 262 [2021-11-23 03:27:13,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 87 SyntacticMatches, 4 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21033 ImplicationChecksByTransitivity, 50.6s TimeCoverageRelationStatistics Valid=2118, Invalid=62144, Unknown=0, NotChecked=0, Total=64262 [2021-11-23 03:27:13,831 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 85 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 10264 mSolverCounterSat, 816 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 11080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 816 IncrementalHoareTripleChecker+Valid, 10264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:13,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 201 Invalid, 11080 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [816 Valid, 10264 Invalid, 0 Unknown, 0 Unchecked, 12.2s Time] [2021-11-23 03:27:13,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-23 03:27:13,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 151. [2021-11-23 03:27:13,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.1466666666666667) internal successors, (172), 150 states have internal predecessors, (172), 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) [2021-11-23 03:27:13,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 172 transitions. [2021-11-23 03:27:13,878 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 172 transitions. Word has length 67 [2021-11-23 03:27:13,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:13,879 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 172 transitions. [2021-11-23 03:27:13,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 171 states, 171 states have (on average 1.0994152046783625) internal successors, (188), 171 states have internal predecessors, (188), 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) [2021-11-23 03:27:13,879 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 172 transitions. [2021-11-23 03:27:13,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 03:27:13,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:13,880 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:13,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:14,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:27:14,081 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:14,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:14,081 INFO L85 PathProgramCache]: Analyzing trace with hash 357112902, now seen corresponding path program 16 times [2021-11-23 03:27:14,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:14,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666008131] [2021-11-23 03:27:14,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:14,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:14,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:14,347 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-23 03:27:14,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:14,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666008131] [2021-11-23 03:27:14,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666008131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:14,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771458747] [2021-11-23 03:27:14,348 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:27:14,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:14,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:14,353 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:14,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:27:14,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:14,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:27:14,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:14,887 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-23 03:27:14,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:27:15,057 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-23 03:27:15,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771458747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:27:15,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140410963] [2021-11-23 03:27:15,060 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:27:15,060 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:27:15,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:27:15,061 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:27:15,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:27:15,134 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:27:15,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:27:15,198 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:27:15,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:27:15,220 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 [2021-11-23 03:27:15,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:15,272 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:27:15,300 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:27:15,300 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 241 treesize of output 244 [2021-11-23 03:27:15,385 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 [2021-11-23 03:27:15,640 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:27:16,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11367#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:27:16,077 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:27:16,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:27:16,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-23 03:27:16,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932263156] [2021-11-23 03:27:16,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:27:16,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:27:16,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:16,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:27:16,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=737, Unknown=0, NotChecked=0, Total=930 [2021-11-23 03:27:16,079 INFO L87 Difference]: Start difference. First operand 151 states and 172 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 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) [2021-11-23 03:27:16,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:16,770 INFO L93 Difference]: Finished difference Result 289 states and 333 transitions. [2021-11-23 03:27:16,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 03:27:16,771 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 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 68 [2021-11-23 03:27:16,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:16,772 INFO L225 Difference]: With dead ends: 289 [2021-11-23 03:27:16,772 INFO L226 Difference]: Without dead ends: 149 [2021-11-23 03:27:16,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=298, Invalid=1108, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 03:27:16,773 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 405 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 405 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:16,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 17 Invalid, 784 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [405 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:27:16,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-23 03:27:16,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 142. [2021-11-23 03:27:16,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.127659574468085) internal successors, (159), 141 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) [2021-11-23 03:27:16,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 159 transitions. [2021-11-23 03:27:16,808 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 159 transitions. Word has length 68 [2021-11-23 03:27:16,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:16,809 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 159 transitions. [2021-11-23 03:27:16,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 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) [2021-11-23 03:27:16,809 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 159 transitions. [2021-11-23 03:27:16,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 03:27:16,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:16,810 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:16,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:17,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:17,020 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:17,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:17,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1840229324, now seen corresponding path program 17 times [2021-11-23 03:27:17,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:17,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282016396] [2021-11-23 03:27:17,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:17,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:17,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:17,286 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-23 03:27:17,286 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:17,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282016396] [2021-11-23 03:27:17,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282016396] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:17,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593962600] [2021-11-23 03:27:17,287 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:27:17,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:17,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:17,288 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:17,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:27:17,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 03:27:17,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:27:17,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:27:17,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:17,759 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-23 03:27:17,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:27:17,972 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-23 03:27:17,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593962600] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:27:17,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211060314] [2021-11-23 03:27:17,973 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:27:17,974 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:27:17,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:27:17,974 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:27:17,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:27:18,055 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:27:18,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:27:18,118 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:27:18,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:27:18,140 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 [2021-11-23 03:27:18,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:18,191 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:27:18,220 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:27:18,220 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 241 treesize of output 244 [2021-11-23 03:27:18,277 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 [2021-11-23 03:27:18,483 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:27:18,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12663#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:27:18,807 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:27:18,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:27:18,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-23 03:27:18,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260372052] [2021-11-23 03:27:18,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:27:18,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:27:18,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:18,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:27:18,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2021-11-23 03:27:18,809 INFO L87 Difference]: Start difference. First operand 142 states and 159 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 26 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) [2021-11-23 03:27:19,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:19,493 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2021-11-23 03:27:19,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 03:27:19,493 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 26 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 69 [2021-11-23 03:27:19,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:19,494 INFO L225 Difference]: With dead ends: 146 [2021-11-23 03:27:19,494 INFO L226 Difference]: Without dead ends: 101 [2021-11-23 03:27:19,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:27:19,495 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:19,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 9 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:27:19,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-23 03:27:19,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 77. [2021-11-23 03:27:19,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 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) [2021-11-23 03:27:19,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2021-11-23 03:27:19,517 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2021-11-23 03:27:19,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:19,517 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2021-11-23 03:27:19,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 26 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) [2021-11-23 03:27:19,518 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2021-11-23 03:27:19,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 03:27:19,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:19,519 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:19,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:19,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:19,720 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:19,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:19,721 INFO L85 PathProgramCache]: Analyzing trace with hash 393114464, now seen corresponding path program 18 times [2021-11-23 03:27:19,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:19,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133152879] [2021-11-23 03:27:19,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:19,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:20,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:33,141 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 11 proven. 241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:27:33,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:33,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133152879] [2021-11-23 03:27:33,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133152879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:33,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680352649] [2021-11-23 03:27:33,142 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:27:33,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:33,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:33,144 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:33,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:27:33,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:27:33,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:27:33,279 WARN L261 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 245 conjunts are in the unsatisfiable core [2021-11-23 03:27:33,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:50,568 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 251 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:27:50,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:22,018 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-23 03:28:22,019 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 552 [2021-11-23 03:28:32,936 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-23 03:28:32,936 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 47 [2021-11-23 03:28:33,345 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:28:33,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680352649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:33,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735813073] [2021-11-23 03:28:33,348 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:28:33,348 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:28:33,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:28:33,349 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:28:33,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:28:33,439 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:28:33,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:28:33,451 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 [2021-11-23 03:28:33,476 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 [2021-11-23 03:28:33,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:28:33,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:28:33,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:28:33,541 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:28:33,541 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 246 treesize of output 243 [2021-11-23 03:28:33,581 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 [2021-11-23 03:28:33,782 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:28:56,541 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13766#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:28:56,541 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:28:56,541 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:28:56,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 67, 64] total 197 [2021-11-23 03:28:56,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074461645] [2021-11-23 03:28:56,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:28:56,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 197 states [2021-11-23 03:28:56,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:28:56,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2021-11-23 03:28:56,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=39860, Unknown=0, NotChecked=0, Total=40602 [2021-11-23 03:28:56,547 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 197 states, 197 states have (on average 1.0862944162436547) internal successors, (214), 197 states have internal predecessors, (214), 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) [2021-11-23 03:30:14,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:14,847 INFO L93 Difference]: Finished difference Result 274 states and 310 transitions. [2021-11-23 03:30:14,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-23 03:30:14,848 INFO L78 Accepts]: Start accepts. Automaton has has 197 states, 197 states have (on average 1.0862944162436547) internal successors, (214), 197 states have internal predecessors, (214), 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 76 [2021-11-23 03:30:14,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:14,850 INFO L225 Difference]: With dead ends: 274 [2021-11-23 03:30:14,850 INFO L226 Difference]: Without dead ends: 213 [2021-11-23 03:30:14,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 41 SyntacticMatches, 60 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27693 ImplicationChecksByTransitivity, 134.9s TimeCoverageRelationStatistics Valid=2634, Invalid=86468, Unknown=0, NotChecked=0, Total=89102 [2021-11-23 03:30:14,858 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 13843 mSolverCounterSat, 697 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 14540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 697 IncrementalHoareTripleChecker+Valid, 13843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:14,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 251 Invalid, 14540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [697 Valid, 13843 Invalid, 0 Unknown, 0 Unchecked, 20.0s Time] [2021-11-23 03:30:14,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-23 03:30:14,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 146. [2021-11-23 03:30:14,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 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) [2021-11-23 03:30:14,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 162 transitions. [2021-11-23 03:30:14,913 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 162 transitions. Word has length 76 [2021-11-23 03:30:14,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:14,913 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 162 transitions. [2021-11-23 03:30:14,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 197 states, 197 states have (on average 1.0862944162436547) internal successors, (214), 197 states have internal predecessors, (214), 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) [2021-11-23 03:30:14,914 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 162 transitions. [2021-11-23 03:30:14,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 03:30:14,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:14,915 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:14,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:15,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:15,115 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:15,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:15,116 INFO L85 PathProgramCache]: Analyzing trace with hash -853010053, now seen corresponding path program 19 times [2021-11-23 03:30:15,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:15,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803906345] [2021-11-23 03:30:15,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:15,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:15,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 03:30:15,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:15,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803906345] [2021-11-23 03:30:15,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803906345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:15,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396404485] [2021-11-23 03:30:15,431 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:30:15,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:15,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:15,432 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:15,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:30:15,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:15,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:30:15,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:15,968 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 03:30:15,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:16,161 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 03:30:16,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396404485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:16,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973178970] [2021-11-23 03:30:16,164 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:30:16,164 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:16,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:30:16,165 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:30:16,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:30:16,240 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:30:16,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:30:16,265 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 [2021-11-23 03:30:16,292 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 [2021-11-23 03:30:16,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:30:16,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:30:16,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:30:16,371 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:30:16,372 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 246 treesize of output 243 [2021-11-23 03:30:16,424 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 [2021-11-23 03:30:16,617 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:30:16,925 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15273#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:30:16,925 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:30:16,925 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:16,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-23 03:30:16,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806992721] [2021-11-23 03:30:16,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:16,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 03:30:16,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:16,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 03:30:16,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=889, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:30:16,928 INFO L87 Difference]: Start difference. First operand 146 states and 162 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 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) [2021-11-23 03:30:17,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:17,755 INFO L93 Difference]: Finished difference Result 258 states and 289 transitions. [2021-11-23 03:30:17,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 03:30:17,755 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-23 03:30:17,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:17,757 INFO L225 Difference]: With dead ends: 258 [2021-11-23 03:30:17,757 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 03:30:17,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=365, Invalid=1357, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 03:30:17,758 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 582 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 582 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:17,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 15 Invalid, 999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [582 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:30:17,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 03:30:17,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 109. [2021-11-23 03:30:17,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.1111111111111112) internal successors, (120), 108 states have internal predecessors, (120), 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) [2021-11-23 03:30:17,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 120 transitions. [2021-11-23 03:30:17,807 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 120 transitions. Word has length 77 [2021-11-23 03:30:17,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:17,807 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 120 transitions. [2021-11-23 03:30:17,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 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) [2021-11-23 03:30:17,808 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 120 transitions. [2021-11-23 03:30:17,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 03:30:17,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:17,809 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:17,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:18,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:18,024 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:18,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:18,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1752202363, now seen corresponding path program 20 times [2021-11-23 03:30:18,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:18,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767006363] [2021-11-23 03:30:18,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:18,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:18,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:18,362 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-23 03:30:18,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:18,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767006363] [2021-11-23 03:30:18,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767006363] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:18,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087647953] [2021-11-23 03:30:18,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:30:18,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:18,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:18,365 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:18,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:30:18,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 03:30:18,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:18,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:30:18,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:19,048 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-23 03:30:19,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:19,273 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-23 03:30:19,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087647953] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:19,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [869698713] [2021-11-23 03:30:19,276 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:30:19,277 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:19,277 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:30:19,277 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:30:19,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:30:19,353 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:30:19,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:30:19,419 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:30:19,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:30:19,441 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 [2021-11-23 03:30:19,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:30:19,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:30:19,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:30:19,536 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:30:19,537 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 246 treesize of output 243 [2021-11-23 03:30:19,585 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 [2021-11-23 03:30:19,828 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:30:20,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16518#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:30:20,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:30:20,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:20,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-23 03:30:20,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824464782] [2021-11-23 03:30:20,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:20,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 03:30:20,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:20,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 03:30:20,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:30:20,099 INFO L87 Difference]: Start difference. First operand 109 states and 120 transitions. Second operand has 29 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 29 states have internal predecessors, (72), 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) [2021-11-23 03:30:20,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:20,824 INFO L93 Difference]: Finished difference Result 113 states and 124 transitions. [2021-11-23 03:30:20,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:30:20,824 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 29 states have internal predecessors, (72), 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 [2021-11-23 03:30:20,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:20,825 INFO L225 Difference]: With dead ends: 113 [2021-11-23 03:30:20,825 INFO L226 Difference]: Without dead ends: 86 [2021-11-23 03:30:20,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 234 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:30:20,826 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:20,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 17 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:30:20,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-23 03:30:20,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-23 03:30:20,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 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) [2021-11-23 03:30:20,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2021-11-23 03:30:20,862 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 81 [2021-11-23 03:30:20,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:20,862 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2021-11-23 03:30:20,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 29 states have internal predecessors, (72), 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) [2021-11-23 03:30:20,862 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2021-11-23 03:30:20,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 03:30:20,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:20,864 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:20,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:21,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:21,066 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:21,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:21,067 INFO L85 PathProgramCache]: Analyzing trace with hash -651134475, now seen corresponding path program 21 times [2021-11-23 03:30:21,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:21,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395542776] [2021-11-23 03:30:21,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:21,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:21,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:39,265 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 22 proven. 302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:30:39,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:39,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395542776] [2021-11-23 03:30:39,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395542776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:39,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035167254] [2021-11-23 03:30:39,266 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:30:39,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:39,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:39,267 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:39,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:30:39,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:30:39,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:39,407 WARN L261 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 279 conjunts are in the unsatisfiable core [2021-11-23 03:30:39,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:03,309 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 323 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:31:03,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:49,150 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-23 03:31:49,151 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 717 [2021-11-23 03:32:01,813 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-23 03:32:01,813 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 54 [2021-11-23 03:32:02,231 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 03:32:02,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035167254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:02,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914763519] [2021-11-23 03:32:02,233 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:32:02,233 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:02,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:32:02,234 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:32:02,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:32:02,327 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:32:02,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:32:02,411 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:32:02,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:32:02,435 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 [2021-11-23 03:32:02,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:02,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:02,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:32:02,508 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:32:02,509 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 246 treesize of output 243 [2021-11-23 03:32:02,551 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 [2021-11-23 03:32:02,752 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:32:33,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17663#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:32:33,335 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:32:33,335 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:32:33,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 76, 72] total 223 [2021-11-23 03:32:33,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156455974] [2021-11-23 03:32:33,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:33,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 223 states [2021-11-23 03:32:33,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:33,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 223 interpolants. [2021-11-23 03:32:33,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=791, Invalid=50965, Unknown=0, NotChecked=0, Total=51756 [2021-11-23 03:32:33,341 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 223 states, 223 states have (on average 1.0762331838565022) internal successors, (240), 223 states have internal predecessors, (240), 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) [2021-11-23 03:35:15,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:35:15,938 INFO L93 Difference]: Finished difference Result 352 states and 431 transitions. [2021-11-23 03:35:15,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-23 03:35:15,938 INFO L78 Accepts]: Start accepts. Automaton has has 223 states, 223 states have (on average 1.0762331838565022) internal successors, (240), 223 states have internal predecessors, (240), 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 85 [2021-11-23 03:35:15,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:35:15,941 INFO L225 Difference]: With dead ends: 352 [2021-11-23 03:35:15,941 INFO L226 Difference]: Without dead ends: 348 [2021-11-23 03:35:15,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 44 SyntacticMatches, 67 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38755 ImplicationChecksByTransitivity, 232.5s TimeCoverageRelationStatistics Valid=5109, Invalid=127751, Unknown=0, NotChecked=0, Total=132860 [2021-11-23 03:35:15,951 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 284 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 23330 mSolverCounterSat, 4707 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 28037 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4707 IncrementalHoareTripleChecker+Valid, 23330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:35:15,951 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 269 Invalid, 28037 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4707 Valid, 23330 Invalid, 0 Unknown, 0 Unchecked, 36.2s Time] [2021-11-23 03:35:15,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-23 03:35:16,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 151. [2021-11-23 03:35:16,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.1666666666666667) internal successors, (175), 150 states have internal predecessors, (175), 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) [2021-11-23 03:35:16,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 175 transitions. [2021-11-23 03:35:16,015 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 175 transitions. Word has length 85 [2021-11-23 03:35:16,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:35:16,016 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 175 transitions. [2021-11-23 03:35:16,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 223 states, 223 states have (on average 1.0762331838565022) internal successors, (240), 223 states have internal predecessors, (240), 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) [2021-11-23 03:35:16,017 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 175 transitions. [2021-11-23 03:35:16,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 03:35:16,018 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:35:16,018 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:35:16,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 03:35:16,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:35:16,244 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:35:16,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:35:16,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1121098778, now seen corresponding path program 22 times [2021-11-23 03:35:16,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:35:16,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554187434] [2021-11-23 03:35:16,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:35:16,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:35:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:35:16,639 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-23 03:35:16,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:35:16,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554187434] [2021-11-23 03:35:16,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554187434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:35:16,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492712555] [2021-11-23 03:35:16,640 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:35:16,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:35:16,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:35:16,641 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:35:16,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 03:35:16,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:35:16,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:35:16,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:35:17,339 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-23 03:35:17,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:35:17,535 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-23 03:35:17,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492712555] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:35:17,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [374620072] [2021-11-23 03:35:17,537 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:35:17,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:35:17,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:35:17,537 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:35:17,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:35:17,610 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:35:17,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:35:17,671 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:35:17,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:35:17,695 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 [2021-11-23 03:35:17,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:35:17,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:35:17,777 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:35:17,777 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 241 treesize of output 244 [2021-11-23 03:35:17,845 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 [2021-11-23 03:35:18,063 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:35:20,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19473#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:35:20,598 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:35:20,598 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:35:20,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-23 03:35:20,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936537477] [2021-11-23 03:35:20,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:35:20,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:35:20,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:35:20,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:35:20,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=1055, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:35:20,601 INFO L87 Difference]: Start difference. First operand 151 states and 175 transitions. Second operand has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 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) [2021-11-23 03:35:21,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:35:21,512 INFO L93 Difference]: Finished difference Result 376 states and 436 transitions. [2021-11-23 03:35:21,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:35:21,513 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 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 86 [2021-11-23 03:35:21,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:35:21,514 INFO L225 Difference]: With dead ends: 376 [2021-11-23 03:35:21,514 INFO L226 Difference]: Without dead ends: 173 [2021-11-23 03:35:21,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 178 SyntacticMatches, 64 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2479 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=439, Invalid=1631, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 03:35:21,516 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 472 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 472 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:35:21,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 17 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [472 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:35:21,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-23 03:35:21,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 166. [2021-11-23 03:35:21,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.1333333333333333) internal successors, (187), 165 states have internal predecessors, (187), 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) [2021-11-23 03:35:21,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2021-11-23 03:35:21,579 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 86 [2021-11-23 03:35:21,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:35:21,580 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2021-11-23 03:35:21,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 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) [2021-11-23 03:35:21,580 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2021-11-23 03:35:21,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-23 03:35:21,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:35:21,581 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:35:21,632 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-23 03:35:21,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 03:35:21,796 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:35:21,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:35:21,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1393333712, now seen corresponding path program 23 times [2021-11-23 03:35:21,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:35:21,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765352987] [2021-11-23 03:35:21,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:35:21,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:35:21,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:35:22,200 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-23 03:35:22,200 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:35:22,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765352987] [2021-11-23 03:35:22,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765352987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:35:22,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558553470] [2021-11-23 03:35:22,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:35:22,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:35:22,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:35:22,204 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:35:22,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 03:35:22,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 03:35:22,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:35:22,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:35:22,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:35:22,966 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-23 03:35:22,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:35:23,242 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-23 03:35:23,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558553470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:35:23,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643001675] [2021-11-23 03:35:23,245 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 03:35:23,245 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:35:23,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:35:23,246 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:35:23,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:35:23,337 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 03:35:23,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 03:35:23,399 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 03:35:23,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 03:35:23,423 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 [2021-11-23 03:35:23,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:35:23,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:35:23,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:35:23,533 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:35:23,534 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 246 treesize of output 243 [2021-11-23 03:35:23,578 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 [2021-11-23 03:35:23,760 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:35:24,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21127#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |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 [2021-11-23 03:35:24,033 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:35:24,033 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:35:24,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-23 03:35:24,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781628032] [2021-11-23 03:35:24,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:35:24,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:35:24,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:35:24,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:35:24,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:35:24,036 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 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) [2021-11-23 03:35:24,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:35:24,896 INFO L93 Difference]: Finished difference Result 170 states and 191 transitions. [2021-11-23 03:35:24,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:35:24,897 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 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 90 [2021-11-23 03:35:24,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:35:24,899 INFO L225 Difference]: With dead ends: 170 [2021-11-23 03:35:24,899 INFO L226 Difference]: Without dead ends: 131 [2021-11-23 03:35:24,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 253 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:35:24,900 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:35:24,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 1016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:35:24,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-23 03:35:24,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 95. [2021-11-23 03:35:24,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 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) [2021-11-23 03:35:24,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2021-11-23 03:35:24,944 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 90 [2021-11-23 03:35:24,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:35:24,945 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2021-11-23 03:35:24,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 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) [2021-11-23 03:35:24,945 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2021-11-23 03:35:24,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 03:35:24,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:35:24,946 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:35:24,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:35:25,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 03:35:25,146 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:35:25,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:35:25,147 INFO L85 PathProgramCache]: Analyzing trace with hash -1825812992, now seen corresponding path program 24 times [2021-11-23 03:35:25,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:35:25,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154126089] [2021-11-23 03:35:25,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:35:25,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:35:25,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:35:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 30 proven. 375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:35:47,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:35:47,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154126089] [2021-11-23 03:35:47,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154126089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:35:47,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975860775] [2021-11-23 03:35:47,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:35:47,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:35:47,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:35:47,537 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:35:47,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4aab2f67-69ec-439f-933e-afd90777ab04/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 03:35:47,665 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:35:47,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:35:47,672 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 313 conjunts are in the unsatisfiable core [2021-11-23 03:35:47,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:36:14,858 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 404 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:36:14,859 INFO L328 TraceCheckSpWp]: Computing backward predicates...