./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P --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 ca98535e808a51f7cfa7d21c9d33f259821212a6554e27f29c2bddd9197c0249 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:09:52,057 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:09:52,060 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:09:52,098 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:09:52,099 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:09:52,100 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:09:52,102 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:09:52,104 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:09:52,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:09:52,108 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:09:52,109 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:09:52,110 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:09:52,111 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:09:52,112 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:09:52,114 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:09:52,115 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:09:52,116 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:09:52,117 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:09:52,119 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:09:52,122 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:09:52,124 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:09:52,127 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:09:52,128 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:09:52,129 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:09:52,133 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:09:52,133 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:09:52,133 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:09:52,134 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:09:52,135 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:09:52,136 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:09:52,136 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:09:52,137 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:09:52,138 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:09:52,147 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:09:52,150 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:09:52,150 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:09:52,151 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:09:52,151 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:09:52,151 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:09:52,152 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:09:52,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:09:52,154 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:09:52,204 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:09:52,204 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:09:52,204 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:09:52,205 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:09:52,208 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:09:52,209 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:09:52,209 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:09:52,209 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:09:52,209 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:09:52,209 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:09:52,209 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:09:52,210 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:09:52,210 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:09:52,210 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:09:52,210 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:09:52,210 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:09:52,211 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:09:52,211 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:09:52,211 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:09:52,212 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:09:52,212 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:09:52,212 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:09:52,212 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:09:52,212 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:09:52,213 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:09:52,213 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:09:52,213 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:09:52,213 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:09:52,213 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:09:52,214 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:09:52,214 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:09:52,214 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:09:52,214 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:09:52,214 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:09:52,215 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:09:52,215 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:09:52,215 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:09:52,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:09:52,215 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:09:52,215 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:09:52,216 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:09:52,216 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_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca98535e808a51f7cfa7d21c9d33f259821212a6554e27f29c2bddd9197c0249 [2021-11-21 01:09:52,460 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:09:52,480 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:09:52,483 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:09:52,484 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:09:52,484 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:09:52,486 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loops/invert_string-3.c [2021-11-21 01:09:52,559 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/data/0ef0b4a14/0d4ed55f639d4c59819cb1f6e929e0d6/FLAG416315d83 [2021-11-21 01:09:53,042 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:09:53,043 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/sv-benchmarks/c/loops/invert_string-3.c [2021-11-21 01:09:53,050 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/data/0ef0b4a14/0d4ed55f639d4c59819cb1f6e929e0d6/FLAG416315d83 [2021-11-21 01:09:53,459 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/data/0ef0b4a14/0d4ed55f639d4c59819cb1f6e929e0d6 [2021-11-21 01:09:53,462 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:09:53,463 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:09:53,465 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:09:53,465 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:09:53,469 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:09:53,469 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,470 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b787b0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53, skipping insertion in model container [2021-11-21 01:09:53,471 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,478 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:09:53,491 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:09:53,687 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_8a47930d-c25d-4686-b6a6-c0e68d8b32df/sv-benchmarks/c/loops/invert_string-3.c[327,340] [2021-11-21 01:09:53,705 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:09:53,712 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:09:53,724 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_8a47930d-c25d-4686-b6a6-c0e68d8b32df/sv-benchmarks/c/loops/invert_string-3.c[327,340] [2021-11-21 01:09:53,732 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:09:53,746 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:09:53,746 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53 WrapperNode [2021-11-21 01:09:53,746 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:09:53,748 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:09:53,748 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:09:53,748 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:09:53,756 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,762 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,782 INFO L137 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 69 [2021-11-21 01:09:53,783 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:09:53,784 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:09:53,784 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:09:53,784 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:09:53,792 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,793 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,795 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,795 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,800 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,805 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,806 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,808 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:09:53,809 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:09:53,810 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:09:53,810 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:09:53,811 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (1/1) ... [2021-11-21 01:09:53,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:09:53,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:53,841 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:09:53,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:09:53,890 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:09:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:09:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:09:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:09:53,891 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:09:53,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:09:53,892 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:09:53,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:09:53,971 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:09:53,973 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:09:54,109 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:09:54,142 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:09:54,142 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:09:54,144 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:09:54 BoogieIcfgContainer [2021-11-21 01:09:54,144 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:09:54,146 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:09:54,146 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:09:54,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:09:54,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:09:53" (1/3) ... [2021-11-21 01:09:54,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53a1fd17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:09:54, skipping insertion in model container [2021-11-21 01:09:54,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:09:53" (2/3) ... [2021-11-21 01:09:54,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53a1fd17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:09:54, skipping insertion in model container [2021-11-21 01:09:54,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:09:54" (3/3) ... [2021-11-21 01:09:54,154 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-3.c [2021-11-21 01:09:54,160 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:09:54,160 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:09:54,208 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:09:54,215 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 [2021-11-21 01:09:54,215 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:09:54,228 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:54,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:09:54,233 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:54,234 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:09:54,234 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:54,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:54,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1538904472, now seen corresponding path program 1 times [2021-11-21 01:09:54,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:54,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890821887] [2021-11-21 01:09:54,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:54,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:54,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:54,571 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:54,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890821887] [2021-11-21 01:09:54,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1890821887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:09:54,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:09:54,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:09:54,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707492385] [2021-11-21 01:09:54,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:09:54,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:09:54,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:54,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:09:54,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:09:54,637 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:54,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:54,746 INFO L93 Difference]: Finished difference Result 16 states and 21 transitions. [2021-11-21 01:09:54,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:09:54,749 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 01:09:54,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:54,757 INFO L225 Difference]: With dead ends: 16 [2021-11-21 01:09:54,757 INFO L226 Difference]: Without dead ends: 9 [2021-11-21 01:09:54,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:09:54,763 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:54,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 6 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:09:54,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-21 01:09:54,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-21 01:09:54,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:54,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-11-21 01:09:54,807 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-11-21 01:09:54,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:54,807 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-11-21 01:09:54,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:54,808 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-11-21 01:09:54,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:09:54,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:54,809 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:09:54,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:09:54,809 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:54,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:54,810 INFO L85 PathProgramCache]: Analyzing trace with hash -467836134, now seen corresponding path program 1 times [2021-11-21 01:09:54,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:54,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977429850] [2021-11-21 01:09:54,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:54,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:54,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:54,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:09:54,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:54,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977429850] [2021-11-21 01:09:54,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977429850] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:09:54,995 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:09:54,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:09:54,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82979374] [2021-11-21 01:09:54,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:09:54,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:09:54,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:54,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:09:54,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:09:54,999 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:55,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:55,046 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2021-11-21 01:09:55,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:09:55,047 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-21 01:09:55,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:55,048 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:09:55,048 INFO L226 Difference]: Without dead ends: 10 [2021-11-21 01:09:55,048 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 [2021-11-21 01:09:55,050 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:55,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:09:55,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-21 01:09:55,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-21 01:09:55,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-21 01:09:55,056 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-11-21 01:09:55,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:55,056 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-21 01:09:55,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:55,057 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-21 01:09:55,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:09:55,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:55,057 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:09:55,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:09:55,075 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:55,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:55,076 INFO L85 PathProgramCache]: Analyzing trace with hash 924727707, now seen corresponding path program 1 times [2021-11-21 01:09:55,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:55,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237861959] [2021-11-21 01:09:55,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:55,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:55,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:55,273 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:09:55,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:55,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237861959] [2021-11-21 01:09:55,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237861959] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:55,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621798626] [2021-11-21 01:09:55,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:55,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:55,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:55,291 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:55,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:09:55,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:55,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 01:09:55,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:55,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:09:55,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-21 01:09:55,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-21 01:09:55,810 INFO L354 Elim1Store]: treesize reduction 54, result has 1.8 percent of original size [2021-11-21 01:09:55,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 103 treesize of output 108 [2021-11-21 01:09:56,184 INFO L354 Elim1Store]: treesize reduction 72, result has 8.9 percent of original size [2021-11-21 01:09:56,185 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 90 treesize of output 56 [2021-11-21 01:09:56,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:09:56,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:56,499 INFO L354 Elim1Store]: treesize reduction 29, result has 3.3 percent of original size [2021-11-21 01:09:56,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 194 treesize of output 1 [2021-11-21 01:09:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:09:56,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621798626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:56,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1250707270] [2021-11-21 01:09:56,529 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:56,530 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:56,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:56,539 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:56,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:56,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,744 INFO L354 Elim1Store]: treesize reduction 150, result has 30.2 percent of original size [2021-11-21 01:09:56,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 59 treesize of output 119 [2021-11-21 01:09:56,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,845 INFO L354 Elim1Store]: treesize reduction 9, result has 47.1 percent of original size [2021-11-21 01:09:56,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 35 treesize of output 35 [2021-11-21 01:09:56,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:56,974 INFO L354 Elim1Store]: treesize reduction 12, result has 63.6 percent of original size [2021-11-21 01:09:56,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 43 treesize of output 53 [2021-11-21 01:09:57,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,045 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:09:57,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-21 01:09:57,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,226 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:09:57,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:09:57,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:57,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:09:57,577 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:09:57,618 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-21 01:09:57,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 270 treesize of output 267 [2021-11-21 01:09:58,223 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 23 treesize of output 19 [2021-11-21 01:09:58,355 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 17 treesize of output 13 [2021-11-21 01:09:58,366 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:09:58,455 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:09:58,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:58,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 24 [2021-11-21 01:09:58,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:58,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:09:58,614 INFO L354 Elim1Store]: treesize reduction 202, result has 19.5 percent of original size [2021-11-21 01:09:58,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 82 treesize of output 105 [2021-11-21 01:09:58,746 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:09:58,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:09:59,087 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:59,363 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:59,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:59,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 6, 6] total 12 [2021-11-21 01:09:59,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575906927] [2021-11-21 01:09:59,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:59,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:09:59,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:59,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:09:59,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:09:59,368 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:00,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:00,412 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-11-21 01:10:00,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:10:00,413 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:10:00,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:00,414 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:10:00,414 INFO L226 Difference]: Without dead ends: 26 [2021-11-21 01:10:00,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=166, Invalid=590, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:10:00,417 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 36 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:00,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 23 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:10:00,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-21 01:10:00,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 15. [2021-11-21 01:10:00,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:00,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2021-11-21 01:10:00,424 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 8 [2021-11-21 01:10:00,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:00,424 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2021-11-21 01:10:00,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:00,425 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2021-11-21 01:10:00,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:10:00,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:00,426 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:10:00,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:00,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:00,639 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:00,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:00,640 INFO L85 PathProgramCache]: Analyzing trace with hash 179363066, now seen corresponding path program 2 times [2021-11-21 01:10:00,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:00,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896360880] [2021-11-21 01:10:00,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:00,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:00,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:00,738 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:10:00,738 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:00,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896360880] [2021-11-21 01:10:00,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896360880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:00,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317222167] [2021-11-21 01:10:00,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:10:00,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:00,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:00,740 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:00,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:10:00,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:10:00,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:00,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:10:00,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:00,880 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:10:00,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:00,978 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:10:00,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317222167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:00,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944495428] [2021-11-21 01:10:00,982 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:00,982 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:00,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:00,982 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:00,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:01,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,159 INFO L354 Elim1Store]: treesize reduction 150, result has 30.2 percent of original size [2021-11-21 01:10:01,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 59 treesize of output 119 [2021-11-21 01:10:01,234 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:01,308 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:01,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,545 INFO L354 Elim1Store]: treesize reduction 8, result has 80.5 percent of original size [2021-11-21 01:10:01,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 156 treesize of output 172 [2021-11-21 01:10:01,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,767 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:10:01,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:10:01,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:01,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:10:02,073 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:02,112 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-21 01:10:02,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 270 treesize of output 267 [2021-11-21 01:10:02,645 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 23 treesize of output 19 [2021-11-21 01:10:02,726 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:02,739 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 17 treesize of output 13 [2021-11-21 01:10:02,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:02,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 27 [2021-11-21 01:10:02,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:02,942 INFO L354 Elim1Store]: treesize reduction 143, result has 14.4 percent of original size [2021-11-21 01:10:02,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 92 treesize of output 80 [2021-11-21 01:10:03,053 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:10:03,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:10:03,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:03,607 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:03,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:03,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-21 01:10:03,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404013154] [2021-11-21 01:10:03,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:03,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:10:03,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:03,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:10:03,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=139, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:10:03,610 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:03,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:03,731 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-21 01:10:03,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:10:03,732 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 01:10:03,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:03,732 INFO L225 Difference]: With dead ends: 29 [2021-11-21 01:10:03,733 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 01:10:03,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:10:03,734 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:03,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 19 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:10:03,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 01:10:03,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-21 01:10:03,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:03,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-21 01:10:03,741 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2021-11-21 01:10:03,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:03,741 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-21 01:10:03,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:03,741 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-21 01:10:03,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:10:03,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:03,742 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1] [2021-11-21 01:10:03,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:03,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:03,943 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:03,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:03,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1932709595, now seen corresponding path program 3 times [2021-11-21 01:10:03,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:03,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834155265] [2021-11-21 01:10:03,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:03,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:03,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:04,187 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:04,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:04,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834155265] [2021-11-21 01:10:04,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834155265] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:04,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533749795] [2021-11-21 01:10:04,188 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:10:04,188 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:04,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:04,189 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:04,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:10:04,243 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:10:04,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:04,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-21 01:10:04,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:04,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:10:04,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2021-11-21 01:10:04,699 INFO L354 Elim1Store]: treesize reduction 100, result has 6.5 percent of original size [2021-11-21 01:10:04,700 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 113 treesize of output 73 [2021-11-21 01:10:04,731 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:04,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:04,893 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:04,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2021-11-21 01:10:04,973 INFO L354 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2021-11-21 01:10:04,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2021-11-21 01:10:04,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2021-11-21 01:10:04,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2021-11-21 01:10:05,005 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:05,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2021-11-21 01:10:05,107 INFO L354 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2021-11-21 01:10:05,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2021-11-21 01:10:05,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2021-11-21 01:10:05,146 INFO L354 Elim1Store]: treesize reduction 27, result has 34.1 percent of original size [2021-11-21 01:10:05,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 45 [2021-11-21 01:10:05,391 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:05,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533749795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:05,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [238127151] [2021-11-21 01:10:05,396 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:05,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:05,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:05,398 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:05,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:05,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,489 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:10:05,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:10:05,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 91 [2021-11-21 01:10:05,628 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:05,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 29 [2021-11-21 01:10:05,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:05,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:10:05,888 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:05,926 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-21 01:10:05,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 270 treesize of output 267 [2021-11-21 01:10:06,448 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 23 treesize of output 19 [2021-11-21 01:10:06,563 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 17 treesize of output 13 [2021-11-21 01:10:06,573 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:06,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:06,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:06,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 21 [2021-11-21 01:10:06,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:06,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:06,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:06,777 INFO L354 Elim1Store]: treesize reduction 178, result has 25.2 percent of original size [2021-11-21 01:10:06,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 83 treesize of output 106 [2021-11-21 01:10:06,933 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:10:06,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:10:07,269 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:07,544 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:07,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:07,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 19 [2021-11-21 01:10:07,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502456311] [2021-11-21 01:10:07,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:07,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:10:07,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:07,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:10:07,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:10:07,547 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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) [2021-11-21 01:10:08,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:08,688 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-11-21 01:10:08,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:10:08,689 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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 14 [2021-11-21 01:10:08,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:08,690 INFO L225 Difference]: With dead ends: 46 [2021-11-21 01:10:08,690 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 01:10:08,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=272, Invalid=1134, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:10:08,692 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 72 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:08,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 49 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:10:08,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 01:10:08,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 22. [2021-11-21 01:10:08,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 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) [2021-11-21 01:10:08,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-21 01:10:08,702 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 14 [2021-11-21 01:10:08,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:08,702 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-21 01:10:08,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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) [2021-11-21 01:10:08,703 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-21 01:10:08,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:10:08,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:08,704 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:10:08,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:08,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:08,922 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:08,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:08,922 INFO L85 PathProgramCache]: Analyzing trace with hash 1175391446, now seen corresponding path program 1 times [2021-11-21 01:10:08,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:08,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469463533] [2021-11-21 01:10:08,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:08,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:08,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:09,191 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 01:10:09,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:09,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469463533] [2021-11-21 01:10:09,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469463533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:09,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426825689] [2021-11-21 01:10:09,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:09,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:09,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:09,193 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:09,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:10:09,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:09,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 01:10:09,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:09,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:10:09,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:10:09,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:09,661 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-21 01:10:09,662 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 1 case distinctions, treesize of input 79 treesize of output 84 [2021-11-21 01:10:10,061 INFO L354 Elim1Store]: treesize reduction 198, result has 3.4 percent of original size [2021-11-21 01:10:10,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 126 treesize of output 76 [2021-11-21 01:10:10,095 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:10,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:10,355 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:10,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1112 treesize of output 992 [2021-11-21 01:10:10,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:10,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:10,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 471 treesize of output 370 [2021-11-21 01:10:10,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 874 treesize of output 802 [2021-11-21 01:10:10,595 INFO L354 Elim1Store]: treesize reduction 59, result has 35.2 percent of original size [2021-11-21 01:10:10,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 3184 treesize of output 2599 [2021-11-21 01:10:19,359 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:19,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1112 treesize of output 992 [2021-11-21 01:10:19,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:19,411 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:19,425 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:19,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 2092 treesize of output 1653 [2021-11-21 01:10:22,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:22,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:22,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 471 treesize of output 370 [2021-11-21 01:10:22,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:22,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 502 treesize of output 430 [2021-11-21 01:10:23,197 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:23,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426825689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:23,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914939740] [2021-11-21 01:10:23,200 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 01:10:23,200 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:23,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:23,201 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:23,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:23,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,284 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:10:23,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:10:23,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 91 [2021-11-21 01:10:23,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2021-11-21 01:10:23,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:23,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:10:23,564 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:23,613 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-21 01:10:23,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 270 treesize of output 267 [2021-11-21 01:10:24,069 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 23 treesize of output 19 [2021-11-21 01:10:24,124 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 17 treesize of output 13 [2021-11-21 01:10:24,131 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:24,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:24,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 27 [2021-11-21 01:10:24,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:24,299 INFO L354 Elim1Store]: treesize reduction 143, result has 14.4 percent of original size [2021-11-21 01:10:24,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 85 treesize of output 80 [2021-11-21 01:10:24,412 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:10:24,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:10:25,530 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:25,914 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:25,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:25,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10] total 24 [2021-11-21 01:10:25,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833081549] [2021-11-21 01:10:25,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:25,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:10:25,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:25,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:10:25,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:10:25,916 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 24 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 24 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:28,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:28,729 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2021-11-21 01:10:28,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:10:28,731 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 24 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-21 01:10:28,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:28,731 INFO L225 Difference]: With dead ends: 60 [2021-11-21 01:10:28,732 INFO L226 Difference]: Without dead ends: 53 [2021-11-21 01:10:28,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=413, Invalid=2037, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:10:28,734 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 167 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:28,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 145 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:10:28,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-21 01:10:28,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 29. [2021-11-21 01:10:28,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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) [2021-11-21 01:10:28,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-11-21 01:10:28,750 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 18 [2021-11-21 01:10:28,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:28,750 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-11-21 01:10:28,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 24 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:28,751 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-11-21 01:10:28,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:10:28,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:28,752 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 1, 1, 1, 1, 1, 1] [2021-11-21 01:10:28,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:28,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:10:28,965 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:28,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:28,966 INFO L85 PathProgramCache]: Analyzing trace with hash -927467045, now seen corresponding path program 4 times [2021-11-21 01:10:28,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:28,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211801510] [2021-11-21 01:10:28,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:28,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:29,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:29,198 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:29,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:29,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211801510] [2021-11-21 01:10:29,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211801510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:29,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676469864] [2021-11-21 01:10:29,199 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:10:29,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:29,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:29,200 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:29,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:10:29,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:29,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 01:10:29,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:29,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:10:29,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2021-11-21 01:10:29,839 INFO L354 Elim1Store]: treesize reduction 100, result has 6.5 percent of original size [2021-11-21 01:10:29,840 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 113 treesize of output 73 [2021-11-21 01:10:29,863 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:29,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:29,993 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:29,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2021-11-21 01:10:30,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2021-11-21 01:10:30,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2021-11-21 01:10:30,079 INFO L354 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2021-11-21 01:10:30,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2021-11-21 01:10:30,097 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:30,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2021-11-21 01:10:30,176 INFO L354 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2021-11-21 01:10:30,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-21 01:10:30,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 16 [2021-11-21 01:10:30,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2021-11-21 01:10:30,636 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:30,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676469864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:30,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536316743] [2021-11-21 01:10:30,638 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:30,639 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:30,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:30,639 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:30,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:30,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,725 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:10:30,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:10:30,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 91 [2021-11-21 01:10:30,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2021-11-21 01:10:30,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:30,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 39 [2021-11-21 01:10:31,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:31,043 INFO L354 Elim1Store]: treesize reduction 90, result has 14.3 percent of original size [2021-11-21 01:10:31,044 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 276 treesize of output 266 [2021-11-21 01:10:31,282 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 23 treesize of output 19 [2021-11-21 01:10:31,336 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:31,342 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 17 treesize of output 13 [2021-11-21 01:10:31,402 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:31,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:31,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 21 [2021-11-21 01:10:31,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:31,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:31,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:31,541 INFO L354 Elim1Store]: treesize reduction 178, result has 25.2 percent of original size [2021-11-21 01:10:31,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 86 treesize of output 106 [2021-11-21 01:10:31,691 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:10:31,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:10:32,014 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:32,390 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:32,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:32,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12] total 30 [2021-11-21 01:10:32,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530817717] [2021-11-21 01:10:32,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:32,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-21 01:10:32,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:32,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-21 01:10:32,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=956, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:10:32,393 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 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) [2021-11-21 01:10:33,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:33,997 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-21 01:10:33,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:10:33,997 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 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 18 [2021-11-21 01:10:33,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:33,998 INFO L225 Difference]: With dead ends: 56 [2021-11-21 01:10:33,998 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 01:10:34,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=635, Invalid=2445, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 01:10:34,001 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 135 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:34,001 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 47 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:10:34,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 01:10:34,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 23. [2021-11-21 01:10:34,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:34,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-21 01:10:34,012 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-11-21 01:10:34,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:34,012 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-21 01:10:34,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 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) [2021-11-21 01:10:34,012 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-21 01:10:34,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:10:34,013 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:34,013 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 01:10:34,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:34,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:34,213 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:34,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:34,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1494188293, now seen corresponding path program 2 times [2021-11-21 01:10:34,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:34,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687566135] [2021-11-21 01:10:34,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:34,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:34,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:35,190 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:35,190 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:35,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687566135] [2021-11-21 01:10:35,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687566135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:35,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421259901] [2021-11-21 01:10:35,191 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:10:35,191 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:35,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:35,192 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:35,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:10:35,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:10:35,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:35,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-21 01:10:35,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:35,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:10:35,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 33 [2021-11-21 01:10:35,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:35,767 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:10:35,767 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 1 case distinctions, treesize of input 55 treesize of output 60 [2021-11-21 01:10:35,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:35,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:35,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:35,977 INFO L354 Elim1Store]: treesize reduction 64, result has 22.9 percent of original size [2021-11-21 01:10:35,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 71 treesize of output 82 [2021-11-21 01:10:39,158 INFO L354 Elim1Store]: treesize reduction 604, result has 1.1 percent of original size [2021-11-21 01:10:39,158 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 228 treesize of output 141 [2021-11-21 01:10:39,216 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:10:39,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:40,113 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:40,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19362 treesize of output 16970 [2021-11-21 01:10:40,217 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-21 01:10:40,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423719917] [2021-11-21 01:10:40,219 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 01:10:40,220 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:40,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:40,220 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:40,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:40,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,304 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:10:40,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:10:40,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 91 [2021-11-21 01:10:40,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 31 [2021-11-21 01:10:40,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 39 [2021-11-21 01:10:40,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:40,666 INFO L354 Elim1Store]: treesize reduction 90, result has 14.3 percent of original size [2021-11-21 01:10:40,666 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 276 treesize of output 266 [2021-11-21 01:10:40,994 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 23 treesize of output 19 [2021-11-21 01:10:41,069 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:10:41,081 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 17 treesize of output 13 [2021-11-21 01:10:41,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:10:41,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:41,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 24 [2021-11-21 01:10:41,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:41,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:41,237 INFO L354 Elim1Store]: treesize reduction 202, result has 19.5 percent of original size [2021-11-21 01:10:41,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 89 treesize of output 105 [2021-11-21 01:10:41,337 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:10:41,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-21 01:10:42,393 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:42,781 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:42,781 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:10:42,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-21 01:10:42,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174575945] [2021-11-21 01:10:42,782 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:42,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 01:10:42,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:42,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 01:10:42,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1108, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:10:42,783 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 18 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:44,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:44,315 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-11-21 01:10:44,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:10:44,316 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 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 [2021-11-21 01:10:44,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:44,316 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:10:44,317 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:10:44,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 31 SyntacticMatches, 7 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=359, Invalid=2721, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 01:10:44,319 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 46 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:44,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:10:44,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:10:44,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 26. [2021-11-21 01:10:44,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 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) [2021-11-21 01:10:44,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-21 01:10:44,329 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-11-21 01:10:44,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:44,330 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-21 01:10:44,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:44,330 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-21 01:10:44,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:10:44,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:44,331 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-21 01:10:44,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:44,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:44,534 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:44,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:44,535 INFO L85 PathProgramCache]: Analyzing trace with hash -317248926, now seen corresponding path program 3 times [2021-11-21 01:10:44,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:44,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865804158] [2021-11-21 01:10:44,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:44,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:44,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:45,175 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:10:45,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:45,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865804158] [2021-11-21 01:10:45,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865804158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:45,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137331010] [2021-11-21 01:10:45,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:10:45,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:45,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:45,178 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:45,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8a47930d-c25d-4686-b6a6-c0e68d8b32df/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:10:45,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:10:45,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:45,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 01:10:45,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:45,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:10:45,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2021-11-21 01:10:45,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 43 [2021-11-21 01:10:45,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 55 treesize of output 66 [2021-11-21 01:10:45,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:10:45,734 INFO L354 Elim1Store]: treesize reduction 81, result has 1.2 percent of original size [2021-11-21 01:10:45,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 7 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 126 treesize of output 143 [2021-11-21 01:10:47,593 INFO L354 Elim1Store]: treesize reduction 1347, result has 0.5 percent of original size [2021-11-21 01:10:47,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 6 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 264 treesize of output 108 [2021-11-21 01:10:47,633 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:10:47,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:48,289 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:10:48,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 6384484 treesize of output 5598060 [2021-11-21 01:10:55,822 WARN L227 SmtUtils]: Spent 7.53s on a formula simplification that was a NOOP. DAG size: 797 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:11:29,142 WARN L227 SmtUtils]: Spent 33.03s on a formula simplification. DAG size of input: 801 DAG size of output: 801 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:12:32,013 WARN L227 SmtUtils]: Spent 41.71s on a formula simplification. DAG size of input: 802 DAG size of output: 802 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:13:30,805 WARN L227 SmtUtils]: Spent 34.17s on a formula simplification. DAG size of input: 799 DAG size of output: 799 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:13:56,151 INFO L354 Elim1Store]: treesize reduction 129, result has 3.0 percent of original size [2021-11-21 01:13:56,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 4869505 treesize of output 3612037 [2021-11-21 01:14:02,494 WARN L227 SmtUtils]: Spent 6.34s on a formula simplification that was a NOOP. DAG size: 782 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:14:08,866 WARN L227 SmtUtils]: Spent 6.37s on a formula simplification that was a NOOP. DAG size: 643 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:14:09,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49869969 treesize of output 48539409