./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/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_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/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_b27d3d77-2c7d-4426-b305-4cd1f6633694/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 aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:14:46,753 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:14:46,756 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:14:46,791 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:14:46,791 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:14:46,793 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:14:46,795 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:14:46,798 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:14:46,800 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:14:46,802 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:14:46,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:14:46,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:14:46,806 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:14:46,808 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:14:46,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:14:46,811 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:14:46,813 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:14:46,814 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:14:46,816 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:14:46,819 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:14:46,822 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:14:46,824 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:14:46,825 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:14:46,827 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:14:46,831 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:14:46,832 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:14:46,832 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:14:46,833 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:14:46,834 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:14:46,836 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:14:46,836 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:14:46,838 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:14:46,839 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:14:46,840 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:14:46,842 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:14:46,842 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:14:46,844 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:14:46,844 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:14:46,845 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:14:46,846 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:14:46,848 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:14:46,849 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:14:46,880 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:14:46,880 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:14:46,881 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:14:46,881 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:14:46,882 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:14:46,882 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:14:46,883 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:14:46,883 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:14:46,883 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:14:46,884 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:14:46,884 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:14:46,884 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:14:46,885 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:14:46,885 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:14:46,885 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:14:46,886 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:14:46,886 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:14:46,886 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:14:46,887 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:14:46,888 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:14:46,888 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:14:46,888 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:14:46,889 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:14:46,889 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:14:46,889 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:14:46,890 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:14:46,890 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:14:46,890 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:14:46,891 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:14:46,891 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:14:46,891 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:14:46,892 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:14:46,892 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:14:46,892 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:14:46,893 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:14:46,893 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:14:46,893 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:14:46,894 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:14:46,894 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:14:46,894 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:14:46,895 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:14:46,895 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_b27d3d77-2c7d-4426-b305-4cd1f6633694/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 [2021-11-21 01:14:47,181 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:14:47,205 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:14:47,210 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:14:47,211 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:14:47,213 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:14:47,214 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2021-11-21 01:14:47,308 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/data/3a2d765c1/a3cb1c1475e048d2a2aae2d77be9da3d/FLAG03532871b [2021-11-21 01:14:47,869 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:14:47,870 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2021-11-21 01:14:47,881 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/data/3a2d765c1/a3cb1c1475e048d2a2aae2d77be9da3d/FLAG03532871b [2021-11-21 01:14:48,206 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/data/3a2d765c1/a3cb1c1475e048d2a2aae2d77be9da3d [2021-11-21 01:14:48,209 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:14:48,211 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:14:48,226 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:14:48,226 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:14:48,231 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:14:48,232 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,235 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40a0dc8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48, skipping insertion in model container [2021-11-21 01:14:48,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,247 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:14:48,273 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:14:48,484 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_b27d3d77-2c7d-4426-b305-4cd1f6633694/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2021-11-21 01:14:48,514 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:14:48,525 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:14:48,541 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_b27d3d77-2c7d-4426-b305-4cd1f6633694/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2021-11-21 01:14:48,557 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:14:48,573 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:14:48,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48 WrapperNode [2021-11-21 01:14:48,574 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:14:48,575 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:14:48,575 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:14:48,575 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:14:48,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,594 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,621 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 126 [2021-11-21 01:14:48,621 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:14:48,622 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:14:48,623 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:14:48,623 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:14:48,634 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,634 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,637 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,645 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,651 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,653 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,656 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:14:48,657 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:14:48,658 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:14:48,658 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:14:48,659 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (1/1) ... [2021-11-21 01:14:48,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:14:48,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:48,707 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:14:48,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:14:48,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:14:48,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:14:48,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:14:48,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 01:14:48,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:14:48,765 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:14:48,765 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:14:48,842 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:14:48,844 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:14:49,120 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:14:49,227 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:14:49,228 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-21 01:14:49,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:14:49 BoogieIcfgContainer [2021-11-21 01:14:49,231 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:14:49,258 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:14:49,258 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:14:49,262 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:14:49,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:14:48" (1/3) ... [2021-11-21 01:14:49,264 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31030df4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:14:49, skipping insertion in model container [2021-11-21 01:14:49,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:14:48" (2/3) ... [2021-11-21 01:14:49,264 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31030df4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:14:49, skipping insertion in model container [2021-11-21 01:14:49,265 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:14:49" (3/3) ... [2021-11-21 01:14:49,266 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m4.c [2021-11-21 01:14:49,279 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:14:49,279 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:14:49,370 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:14:49,389 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 01:14:49,389 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:14:49,415 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:49,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 01:14:49,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:49,432 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:49,433 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:49,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:49,440 INFO L85 PathProgramCache]: Analyzing trace with hash -2021895563, now seen corresponding path program 1 times [2021-11-21 01:14:49,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:49,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795893372] [2021-11-21 01:14:49,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:49,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:49,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:49,723 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 01:14:49,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:49,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795893372] [2021-11-21 01:14:49,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795893372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:14:49,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:14:49,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:14:49,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517061938] [2021-11-21 01:14:49,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:14:49,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:14:49,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:49,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:14:49,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:14:49,783 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:49,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:49,914 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2021-11-21 01:14:49,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:14:49,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 01:14:49,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:49,929 INFO L225 Difference]: With dead ends: 32 [2021-11-21 01:14:49,929 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:14:49,933 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 01:14:49,943 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:49,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:14:49,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:14:49,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:14:49,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:49,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2021-11-21 01:14:49,996 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2021-11-21 01:14:49,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:49,996 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2021-11-21 01:14:49,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:49,999 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2021-11-21 01:14:50,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:14:50,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:50,001 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:50,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:14:50,003 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:50,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:50,007 INFO L85 PathProgramCache]: Analyzing trace with hash 688320013, now seen corresponding path program 1 times [2021-11-21 01:14:50,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:50,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170040245] [2021-11-21 01:14:50,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:50,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:50,092 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 01:14:50,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:50,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170040245] [2021-11-21 01:14:50,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170040245] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:14:50,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:14:50,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:14:50,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033826118] [2021-11-21 01:14:50,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:14:50,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:14:50,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:50,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:14:50,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:14:50,098 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:50,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:50,217 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2021-11-21 01:14:50,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:14:50,218 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 01:14:50,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:50,221 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:14:50,221 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 01:14:50,226 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:14:50,228 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:50,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 5 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:14:50,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 01:14:50,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-21 01:14:50,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:50,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-11-21 01:14:50,252 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2021-11-21 01:14:50,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:50,253 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-11-21 01:14:50,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:50,254 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-11-21 01:14:50,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:14:50,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:50,257 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:50,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:14:50,257 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:50,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:50,258 INFO L85 PathProgramCache]: Analyzing trace with hash -628182144, now seen corresponding path program 1 times [2021-11-21 01:14:50,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:50,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086331355] [2021-11-21 01:14:50,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:50,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:50,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:50,434 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:14:50,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:50,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086331355] [2021-11-21 01:14:50,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086331355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:50,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844221723] [2021-11-21 01:14:50,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:50,437 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:50,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:50,442 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:50,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:14:50,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:50,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:14:50,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:50,667 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:14:50,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:14:50,775 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:14:50,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844221723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:14:50,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [364086461] [2021-11-21 01:14:50,808 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:14:50,808 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:14:50,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:14:50,821 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:14:50,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:14:51,056 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:14:51,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:14:51,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:14:51,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:14:51,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:51,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:14:51,565 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:14:51,566 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 233 treesize of output 236 [2021-11-21 01:14:51,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:14:53,485 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:14:53,651 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:14:53,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:14:53,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-21 01:14:53,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001039781] [2021-11-21 01:14:53,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:14:53,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:14:53,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:53,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:14:53,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:14:53,654 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:53,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:53,737 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2021-11-21 01:14:53,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:14:53,738 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 01:14:53,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:53,739 INFO L225 Difference]: With dead ends: 43 [2021-11-21 01:14:53,739 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:14:53,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:14:53,745 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:53,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:14:53,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:14:53,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-21 01:14:53,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:53,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-21 01:14:53,758 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2021-11-21 01:14:53,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:53,762 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-21 01:14:53,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:53,762 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-21 01:14:53,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:14:53,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:53,765 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:53,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:14:53,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:53,966 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:53,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:53,966 INFO L85 PathProgramCache]: Analyzing trace with hash -681729304, now seen corresponding path program 2 times [2021-11-21 01:14:53,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:53,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083681175] [2021-11-21 01:14:53,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:53,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:54,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:54,071 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:14:54,071 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:54,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083681175] [2021-11-21 01:14:54,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083681175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:54,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329775122] [2021-11-21 01:14:54,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:14:54,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:54,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:54,081 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:54,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:14:54,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:14:54,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:14:54,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:14:54,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:54,235 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:14:54,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:14:54,297 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:14:54,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329775122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:14:54,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1985355456] [2021-11-21 01:14:54,302 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:14:54,303 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:14:54,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:14:54,303 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:14:54,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:14:54,431 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:14:54,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:14:54,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:14:54,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:14:54,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:54,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:54,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:14:54,721 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:14:54,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:14:55,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:14:56,526 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:14:56,722 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:14:56,722 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:14:56,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-21 01:14:56,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876609431] [2021-11-21 01:14:56,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:14:56,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:14:56,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:56,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:14:56,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:14:56,724 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:56,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:56,841 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2021-11-21 01:14:56,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:14:56,842 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-21 01:14:56,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:56,843 INFO L225 Difference]: With dead ends: 49 [2021-11-21 01:14:56,843 INFO L226 Difference]: Without dead ends: 32 [2021-11-21 01:14:56,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:14:56,845 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:56,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 5 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:14:56,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-21 01:14:56,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-21 01:14:56,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:56,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-21 01:14:56,854 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2021-11-21 01:14:56,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:56,854 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-21 01:14:56,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:14:56,855 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-21 01:14:56,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 01:14:56,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:56,856 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:56,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:14:57,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:57,082 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:57,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:57,082 INFO L85 PathProgramCache]: Analyzing trace with hash -1504251819, now seen corresponding path program 3 times [2021-11-21 01:14:57,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:57,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885701672] [2021-11-21 01:14:57,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:57,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:57,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:58,518 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:14:58,519 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:58,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885701672] [2021-11-21 01:14:58,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885701672] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:58,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539232159] [2021-11-21 01:14:58,520 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:14:58,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:58,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:58,521 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:58,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:14:58,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:14:58,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:14:58,586 WARN L261 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-21 01:14:58,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:59,695 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:14:59,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:01,116 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-21 01:15:01,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2021-11-21 01:15:01,211 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-21 01:15:01,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2021-11-21 01:15:01,297 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:15:01,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539232159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:01,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487023423] [2021-11-21 01:15:01,300 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:01,300 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:01,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:01,301 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:01,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:01,402 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:15:01,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:15:01,471 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:01,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:01,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:01,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:01,671 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:01,690 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:01,691 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 233 treesize of output 236 [2021-11-21 01:15:02,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:03,200 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:03,619 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:03,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:03,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 24] total 62 [2021-11-21 01:15:03,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913001111] [2021-11-21 01:15:03,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:03,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-21 01:15:03,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:03,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-21 01:15:03,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=4204, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 01:15:03,624 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:04,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:04,881 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2021-11-21 01:15:04,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:15:04,882 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-21 01:15:04,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:04,884 INFO L225 Difference]: With dead ends: 57 [2021-11-21 01:15:04,884 INFO L226 Difference]: Without dead ends: 54 [2021-11-21 01:15:04,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 50 SyntacticMatches, 6 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1347 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=265, Invalid=5435, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 01:15:04,888 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 1130 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:04,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 61 Invalid, 1141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1130 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:15:04,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-21 01:15:04,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2021-11-21 01:15:04,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:04,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-21 01:15:04,897 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2021-11-21 01:15:04,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:04,898 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-21 01:15:04,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:04,898 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-21 01:15:04,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-21 01:15:04,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:04,900 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:04,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:05,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:05,109 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:05,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:05,110 INFO L85 PathProgramCache]: Analyzing trace with hash -2090822180, now seen corresponding path program 4 times [2021-11-21 01:15:05,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:05,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138278562] [2021-11-21 01:15:05,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:05,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:05,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:05,194 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:15:05,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:05,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138278562] [2021-11-21 01:15:05,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138278562] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:05,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876415221] [2021-11-21 01:15:05,200 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:15:05,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:05,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:05,215 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:05,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:15:05,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:05,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:15:05,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:05,393 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:15:05,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:05,480 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:15:05,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876415221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:05,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1484759640] [2021-11-21 01:15:05,483 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:05,484 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:05,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:05,484 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:05,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:05,583 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:15:05,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:15:05,666 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:05,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:05,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:05,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:05,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:05,844 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:05,865 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:05,865 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 233 treesize of output 236 [2021-11-21 01:15:06,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:07,190 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:07,383 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:07,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:07,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-21 01:15:07,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581732555] [2021-11-21 01:15:07,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:07,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:15:07,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:07,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:15:07,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:15:07,385 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:07,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:07,615 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2021-11-21 01:15:07,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:15:07,616 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-21 01:15:07,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:07,617 INFO L225 Difference]: With dead ends: 114 [2021-11-21 01:15:07,617 INFO L226 Difference]: Without dead ends: 65 [2021-11-21 01:15:07,618 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:15:07,618 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:07,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:15:07,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-21 01:15:07,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-11-21 01:15:07,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.263157894736842) internal successors, (72), 57 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:07,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2021-11-21 01:15:07,628 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 32 [2021-11-21 01:15:07,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:07,628 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2021-11-21 01:15:07,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:07,629 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2021-11-21 01:15:07,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:15:07,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:07,630 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:07,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:07,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:15:07,846 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:07,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:07,846 INFO L85 PathProgramCache]: Analyzing trace with hash 293731444, now seen corresponding path program 5 times [2021-11-21 01:15:07,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:07,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15760938] [2021-11-21 01:15:07,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:07,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:07,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:07,919 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:15:07,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:07,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15760938] [2021-11-21 01:15:07,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15760938] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:07,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180221328] [2021-11-21 01:15:07,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:15:07,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:07,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:07,921 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:07,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:15:07,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:15:07,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:15:07,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:15:07,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:08,095 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:15:08,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:08,189 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:15:08,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180221328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:08,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992546954] [2021-11-21 01:15:08,194 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:08,194 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:08,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:08,195 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:08,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:08,298 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:08,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:08,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:15:08,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:15:08,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:08,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:08,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:08,523 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:15:08,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:15:08,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:09,925 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:10,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:10,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:10,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-21 01:15:10,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637316751] [2021-11-21 01:15:10,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:10,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:15:10,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:10,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:15:10,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:15:10,099 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:10,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:10,326 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2021-11-21 01:15:10,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:15:10,326 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-21 01:15:10,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:10,327 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:15:10,327 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 01:15:10,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:15:10,329 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:10,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:15:10,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 01:15:10,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-21 01:15:10,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:10,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-11-21 01:15:10,336 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2021-11-21 01:15:10,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:10,337 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-11-21 01:15:10,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:10,337 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-11-21 01:15:10,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 01:15:10,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:10,338 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:10,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:10,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:10,561 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:10,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:10,562 INFO L85 PathProgramCache]: Analyzing trace with hash 487958048, now seen corresponding path program 6 times [2021-11-21 01:15:10,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:10,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747651910] [2021-11-21 01:15:10,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:10,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:10,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:13,511 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:15:13,511 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:13,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747651910] [2021-11-21 01:15:13,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747651910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:13,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152353903] [2021-11-21 01:15:13,511 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:15:13,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:13,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:13,514 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:13,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:15:13,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:15:13,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:15:13,601 WARN L261 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-21 01:15:13,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:15,958 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:15:15,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:19,322 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-21 01:15:19,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-21 01:15:19,575 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-21 01:15:19,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-21 01:15:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:15:19,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152353903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:19,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127644122] [2021-11-21 01:15:19,715 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:19,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:19,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:19,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:19,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:19,806 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:19,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:19,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:15:19,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:15:20,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:20,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:20,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:20,024 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:15:20,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:15:20,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:21,361 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:22,018 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:22,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:22,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 93 [2021-11-21 01:15:22,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544762021] [2021-11-21 01:15:22,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:22,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-21 01:15:22,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:22,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-21 01:15:22,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=9197, Unknown=0, NotChecked=0, Total=9506 [2021-11-21 01:15:22,027 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:28,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:28,328 INFO L93 Difference]: Finished difference Result 83 states and 104 transitions. [2021-11-21 01:15:28,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-21 01:15:28,329 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 01:15:28,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:28,330 INFO L225 Difference]: With dead ends: 83 [2021-11-21 01:15:28,330 INFO L226 Difference]: Without dead ends: 80 [2021-11-21 01:15:28,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3502 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=613, Invalid=16679, Unknown=0, NotChecked=0, Total=17292 [2021-11-21 01:15:28,347 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 2926 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 3047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 2926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:28,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 246 Invalid, 3047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 2926 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-21 01:15:28,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-21 01:15:28,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 67. [2021-11-21 01:15:28,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2424242424242424) internal successors, (82), 66 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:28,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 82 transitions. [2021-11-21 01:15:28,360 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 82 transitions. Word has length 40 [2021-11-21 01:15:28,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:28,361 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 82 transitions. [2021-11-21 01:15:28,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:28,362 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 82 transitions. [2021-11-21 01:15:28,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 01:15:28,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:28,363 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:28,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:28,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:28,589 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:28,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:28,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1986766039, now seen corresponding path program 7 times [2021-11-21 01:15:28,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:28,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721420998] [2021-11-21 01:15:28,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:28,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:28,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:28,664 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:15:28,664 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:28,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721420998] [2021-11-21 01:15:28,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721420998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:28,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327999119] [2021-11-21 01:15:28,665 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:15:28,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:28,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:28,666 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:28,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:15:28,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:28,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:15:28,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:28,866 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:15:28,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:28,943 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:15:28,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327999119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:28,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167513408] [2021-11-21 01:15:28,945 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:28,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:28,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:28,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:28,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:29,048 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:29,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:29,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:15:29,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:29,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:29,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:29,262 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:29,263 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 237 treesize of output 240 [2021-11-21 01:15:29,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:30,873 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:31,066 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:31,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:31,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-21 01:15:31,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135165746] [2021-11-21 01:15:31,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:31,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:15:31,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:31,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:15:31,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:15:31,069 INFO L87 Difference]: Start difference. First operand 67 states and 82 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:31,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:31,367 INFO L93 Difference]: Finished difference Result 144 states and 179 transitions. [2021-11-21 01:15:31,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:15:31,367 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 01:15:31,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:31,368 INFO L225 Difference]: With dead ends: 144 [2021-11-21 01:15:31,368 INFO L226 Difference]: Without dead ends: 80 [2021-11-21 01:15:31,369 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:15:31,370 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:31,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 15 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:15:31,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-21 01:15:31,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-11-21 01:15:31,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 72 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:31,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-21 01:15:31,396 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 41 [2021-11-21 01:15:31,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:31,397 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-21 01:15:31,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:31,397 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-21 01:15:31,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 01:15:31,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:31,402 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:31,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:31,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:31,627 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:31,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:31,628 INFO L85 PathProgramCache]: Analyzing trace with hash 96542015, now seen corresponding path program 8 times [2021-11-21 01:15:31,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:31,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39439519] [2021-11-21 01:15:31,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:31,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:31,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:31,727 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 01:15:31,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:31,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39439519] [2021-11-21 01:15:31,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39439519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:31,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700350539] [2021-11-21 01:15:31,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:15:31,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:31,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:31,729 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:31,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:15:31,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:15:31,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:15:31,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:15:31,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:31,974 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 01:15:31,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:32,075 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 01:15:32,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700350539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:32,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200121516] [2021-11-21 01:15:32,078 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:32,078 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:32,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:32,079 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:32,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:32,175 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:32,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:32,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:15:32,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:15:32,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:32,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:15:32,430 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:15:32,430 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 237 treesize of output 240 [2021-11-21 01:15:32,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:33,777 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:33,927 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:33,927 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:33,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-21 01:15:33,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216947827] [2021-11-21 01:15:33,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:33,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:15:33,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:33,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:15:33,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:15:33,929 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:34,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:15:34,186 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-11-21 01:15:34,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:15:34,186 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-21 01:15:34,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:15:34,187 INFO L225 Difference]: With dead ends: 77 [2021-11-21 01:15:34,187 INFO L226 Difference]: Without dead ends: 50 [2021-11-21 01:15:34,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=146, Invalid=610, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:15:34,188 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:15:34,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 15 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:15:34,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-21 01:15:34,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-21 01:15:34,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:34,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2021-11-21 01:15:34,196 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2021-11-21 01:15:34,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:15:34,196 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2021-11-21 01:15:34,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:15:34,196 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2021-11-21 01:15:34,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-21 01:15:34,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:15:34,197 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:15:34,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:15:34,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:34,401 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:15:34,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:15:34,402 INFO L85 PathProgramCache]: Analyzing trace with hash 174183989, now seen corresponding path program 9 times [2021-11-21 01:15:34,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:15:34,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330396589] [2021-11-21 01:15:34,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:15:34,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:15:34,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:15:38,503 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:15:38,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:15:38,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330396589] [2021-11-21 01:15:38,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330396589] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:15:38,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696062100] [2021-11-21 01:15:38,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:15:38,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:15:38,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:15:38,505 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:15:38,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:15:38,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:15:38,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:15:38,584 WARN L261 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 143 conjunts are in the unsatisfiable core [2021-11-21 01:15:38,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:15:41,754 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:15:41,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:15:47,360 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-21 01:15:47,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2021-11-21 01:15:48,244 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-21 01:15:48,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2021-11-21 01:15:48,389 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:15:48,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696062100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:15:48,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [598386576] [2021-11-21 01:15:48,391 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:15:48,392 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:15:48,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:15:48,392 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:15:48,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:15:48,521 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:15:48,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:15:48,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:15:48,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:15:48,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:48,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:48,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:15:48,797 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:15:48,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:15:49,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:15:50,307 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:15:51,197 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:15:51,197 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:15:51,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 40, 40] total 119 [2021-11-21 01:15:51,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042343842] [2021-11-21 01:15:51,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:15:51,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-21 01:15:51,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:15:51,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-21 01:15:51,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=14847, Unknown=0, NotChecked=0, Total=15252 [2021-11-21 01:15:51,206 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 119 states, 119 states have (on average 1.1428571428571428) internal successors, (136), 119 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:13,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:16:13,352 INFO L93 Difference]: Finished difference Result 181 states and 218 transitions. [2021-11-21 01:16:13,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-21 01:16:13,353 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.1428571428571428) internal successors, (136), 119 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-21 01:16:13,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:16:13,354 INFO L225 Difference]: With dead ends: 181 [2021-11-21 01:16:13,354 INFO L226 Difference]: Without dead ends: 141 [2021-11-21 01:16:13,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8285 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=1576, Invalid=34714, Unknown=0, NotChecked=0, Total=36290 [2021-11-21 01:16:13,369 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 110 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 6420 mSolverCounterSat, 622 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 7042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 622 IncrementalHoareTripleChecker+Valid, 6420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:16:13,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 167 Invalid, 7042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [622 Valid, 6420 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-21 01:16:13,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-21 01:16:13,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 95. [2021-11-21 01:16:13,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.1914893617021276) internal successors, (112), 94 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:13,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2021-11-21 01:16:13,391 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 49 [2021-11-21 01:16:13,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:16:13,391 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2021-11-21 01:16:13,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.1428571428571428) internal successors, (136), 119 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:13,392 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2021-11-21 01:16:13,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:16:13,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:16:13,393 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:16:13,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-21 01:16:13,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:16:13,617 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:16:13,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:16:13,618 INFO L85 PathProgramCache]: Analyzing trace with hash -2097607514, now seen corresponding path program 10 times [2021-11-21 01:16:13,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:16:13,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119608992] [2021-11-21 01:16:13,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:16:13,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:16:13,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:16:13,741 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-21 01:16:13,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:16:13,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119608992] [2021-11-21 01:16:13,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119608992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:16:13,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918852144] [2021-11-21 01:16:13,742 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:16:13,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:16:13,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:16:13,744 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:16:13,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:16:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:16:13,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:16:13,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:16:14,015 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-21 01:16:14,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:16:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-21 01:16:14,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918852144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:16:14,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [6355769] [2021-11-21 01:16:14,147 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:16:14,147 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:16:14,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:16:14,149 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:16:14,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:16:14,255 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:16:14,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:16:14,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:16:14,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:16:14,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:14,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:14,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:14,505 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:16:14,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 235 [2021-11-21 01:16:14,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:16:15,880 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:16:16,049 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:16:16,050 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:16:16,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-21 01:16:16,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898309083] [2021-11-21 01:16:16,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:16:16,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:16:16,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:16:16,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:16:16,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:16:16,051 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:16,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:16:16,370 INFO L93 Difference]: Finished difference Result 176 states and 209 transitions. [2021-11-21 01:16:16,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:16:16,371 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-21 01:16:16,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:16:16,372 INFO L225 Difference]: With dead ends: 176 [2021-11-21 01:16:16,372 INFO L226 Difference]: Without dead ends: 80 [2021-11-21 01:16:16,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:16:16,374 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:16:16,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 19 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:16:16,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-21 01:16:16,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-11-21 01:16:16,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1666666666666667) internal successors, (84), 72 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:16,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2021-11-21 01:16:16,390 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 50 [2021-11-21 01:16:16,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:16:16,391 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2021-11-21 01:16:16,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:16,391 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2021-11-21 01:16:16,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 01:16:16,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:16:16,392 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:16:16,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:16:16,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:16:16,598 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:16:16,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:16:16,598 INFO L85 PathProgramCache]: Analyzing trace with hash -434568720, now seen corresponding path program 11 times [2021-11-21 01:16:16,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:16:16,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742605734] [2021-11-21 01:16:16,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:16:16,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:16:16,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:16:16,783 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:16:16,783 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:16:16,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742605734] [2021-11-21 01:16:16,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742605734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:16:16,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826810158] [2021-11-21 01:16:16,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:16:16,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:16:16,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:16:16,789 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:16:16,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:16:16,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:16:16,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:16:16,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:16:16,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:16:17,096 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:16:17,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:16:17,216 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:16:17,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1826810158] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:16:17,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52181448] [2021-11-21 01:16:17,217 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:16:17,217 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:16:17,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:16:17,218 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:16:17,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:16:17,297 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:16:17,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:16:17,353 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:16:17,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:16:17,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:16:17,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:17,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:17,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:17,559 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:16:17,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:16:17,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:16:19,006 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:16:19,164 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:16:19,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:16:19,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-21 01:16:19,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124142711] [2021-11-21 01:16:19,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:16:19,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:16:19,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:16:19,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:16:19,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:16:19,166 INFO L87 Difference]: Start difference. First operand 73 states and 84 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:19,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:16:19,439 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2021-11-21 01:16:19,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:16:19,440 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 01:16:19,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:16:19,441 INFO L225 Difference]: With dead ends: 77 [2021-11-21 01:16:19,441 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 01:16:19,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:16:19,445 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:16:19,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:16:19,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 01:16:19,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-21 01:16:19,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:19,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-21 01:16:19,459 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 54 [2021-11-21 01:16:19,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:16:19,459 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-21 01:16:19,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:16:19,459 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-21 01:16:19,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 01:16:19,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:16:19,460 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:16:19,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-21 01:16:19,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:16:19,661 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:16:19,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:16:19,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1772327104, now seen corresponding path program 12 times [2021-11-21 01:16:19,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:16:19,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901103178] [2021-11-21 01:16:19,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:16:19,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:16:19,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:16:24,914 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 1 proven. 134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:16:24,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:16:24,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901103178] [2021-11-21 01:16:24,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901103178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:16:24,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946620790] [2021-11-21 01:16:24,915 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:16:24,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:16:24,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:16:24,941 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:16:24,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:16:25,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:16:25,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:16:25,044 WARN L261 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 177 conjunts are in the unsatisfiable core [2021-11-21 01:16:25,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:16:30,141 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:16:30,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:16:39,114 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-21 01:16:39,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2021-11-21 01:16:41,061 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-21 01:16:41,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2021-11-21 01:16:41,306 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:16:41,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946620790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:16:41,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [592963787] [2021-11-21 01:16:41,316 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:16:41,316 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:16:41,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:16:41,317 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:16:41,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:16:41,438 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:16:41,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:16:41,523 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:16:41,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:16:41,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:16:41,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:16:41,701 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:16:41,724 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:16:41,724 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 237 treesize of output 240 [2021-11-21 01:16:41,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:16:43,479 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:16:44,595 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:16:44,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:16:44,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 49, 48] total 145 [2021-11-21 01:16:44,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547679068] [2021-11-21 01:16:44,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:16:44,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-21 01:16:44,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:16:44,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-21 01:16:44,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=21830, Unknown=0, NotChecked=0, Total=22350 [2021-11-21 01:16:44,599 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 145 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:02,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:17:02,159 INFO L93 Difference]: Finished difference Result 115 states and 136 transitions. [2021-11-21 01:17:02,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-21 01:17:02,160 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-21 01:17:02,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:17:02,161 INFO L225 Difference]: With dead ends: 115 [2021-11-21 01:17:02,162 INFO L226 Difference]: Without dead ends: 112 [2021-11-21 01:17:02,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8886 ImplicationChecksByTransitivity, 29.6s TimeCoverageRelationStatistics Valid=1059, Invalid=38741, Unknown=0, NotChecked=0, Total=39800 [2021-11-21 01:17:02,167 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 5503 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 5715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 5503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:17:02,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 325 Invalid, 5715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 5503 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2021-11-21 01:17:02,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-21 01:17:02,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 97. [2021-11-21 01:17:02,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.1666666666666667) internal successors, (112), 96 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:02,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 112 transitions. [2021-11-21 01:17:02,190 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 112 transitions. Word has length 58 [2021-11-21 01:17:02,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:17:02,191 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 112 transitions. [2021-11-21 01:17:02,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:02,192 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 112 transitions. [2021-11-21 01:17:02,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 01:17:02,193 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:17:02,193 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:17:02,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:17:02,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:17:02,397 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:17:02,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:17:02,398 INFO L85 PathProgramCache]: Analyzing trace with hash -2083679369, now seen corresponding path program 13 times [2021-11-21 01:17:02,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:17:02,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837770194] [2021-11-21 01:17:02,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:17:02,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:17:02,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:17:02,545 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-21 01:17:02,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:17:02,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837770194] [2021-11-21 01:17:02,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837770194] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:17:02,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571715609] [2021-11-21 01:17:02,546 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:17:02,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:17:02,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:17:02,548 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:17:02,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:17:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:17:02,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:17:02,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:17:02,966 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-21 01:17:02,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:17:03,133 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-21 01:17:03,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571715609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:17:03,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [682894061] [2021-11-21 01:17:03,135 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:17:03,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:17:03,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:17:03,137 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:17:03,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:17:03,243 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:17:03,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:17:03,336 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:17:03,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:17:03,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:17:03,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:17:03,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:17:03,636 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:17:03,637 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 233 treesize of output 236 [2021-11-21 01:17:03,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:17:05,403 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:17:05,622 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:17:05,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:17:05,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-21 01:17:05,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121577678] [2021-11-21 01:17:05,624 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:17:05,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:17:05,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:17:05,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:17:05,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:17:05,625 INFO L87 Difference]: Start difference. First operand 97 states and 112 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:05,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:17:05,993 INFO L93 Difference]: Finished difference Result 204 states and 239 transitions. [2021-11-21 01:17:05,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:17:05,994 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-21 01:17:05,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:17:05,995 INFO L225 Difference]: With dead ends: 204 [2021-11-21 01:17:05,995 INFO L226 Difference]: Without dead ends: 110 [2021-11-21 01:17:05,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=884, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:17:05,996 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:17:05,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 19 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:17:05,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-21 01:17:06,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 103. [2021-11-21 01:17:06,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.1470588235294117) internal successors, (117), 102 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:06,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 117 transitions. [2021-11-21 01:17:06,014 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 117 transitions. Word has length 59 [2021-11-21 01:17:06,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:17:06,014 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 117 transitions. [2021-11-21 01:17:06,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:06,014 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 117 transitions. [2021-11-21 01:17:06,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 01:17:06,015 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:17:06,015 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:17:06,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:17:06,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:17:06,222 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:17:06,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:17:06,222 INFO L85 PathProgramCache]: Analyzing trace with hash -652498465, now seen corresponding path program 14 times [2021-11-21 01:17:06,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:17:06,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151198662] [2021-11-21 01:17:06,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:17:06,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:17:06,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:17:06,336 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-21 01:17:06,336 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:17:06,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151198662] [2021-11-21 01:17:06,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151198662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:17:06,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455079321] [2021-11-21 01:17:06,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:17:06,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:17:06,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:17:06,338 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:17:06,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:17:06,448 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:17:06,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:17:06,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:17:06,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:17:06,643 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-21 01:17:06,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:17:06,793 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-21 01:17:06,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455079321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:17:06,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190479077] [2021-11-21 01:17:06,796 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:17:06,796 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:17:06,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:17:06,797 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:17:06,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:17:06,885 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:17:06,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:17:06,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:17:06,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:17:07,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:17:07,061 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:17:07,081 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:17:07,081 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 233 treesize of output 236 [2021-11-21 01:17:07,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:17:08,579 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:17:08,732 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:17:08,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:17:08,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-21 01:17:08,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482459965] [2021-11-21 01:17:08,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:17:08,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:17:08,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:17:08,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:17:08,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:17:08,733 INFO L87 Difference]: Start difference. First operand 103 states and 117 transitions. Second operand has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:09,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:17:09,049 INFO L93 Difference]: Finished difference Result 107 states and 121 transitions. [2021-11-21 01:17:09,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:17:09,050 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-21 01:17:09,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:17:09,050 INFO L225 Difference]: With dead ends: 107 [2021-11-21 01:17:09,051 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 01:17:09,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 165 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=241, Invalid=1019, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:17:09,052 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:17:09,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:17:09,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 01:17:09,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-21 01:17:09,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:09,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2021-11-21 01:17:09,064 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2021-11-21 01:17:09,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:17:09,065 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2021-11-21 01:17:09,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:17:09,065 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2021-11-21 01:17:09,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-21 01:17:09,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:17:09,066 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:17:09,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:17:09,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:17:09,266 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:17:09,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:17:09,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1455883285, now seen corresponding path program 15 times [2021-11-21 01:17:09,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:17:09,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94982859] [2021-11-21 01:17:09,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:17:09,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:17:09,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:17:16,386 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 7 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:17:16,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:17:16,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94982859] [2021-11-21 01:17:16,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94982859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:17:16,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716698685] [2021-11-21 01:17:16,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:17:16,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:17:16,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:17:16,388 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:17:16,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:17:16,464 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:17:16,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:17:16,469 WARN L261 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 211 conjunts are in the unsatisfiable core [2021-11-21 01:17:16,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:17:22,844 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 188 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:17:22,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:17:31,648 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-21 01:17:31,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-21 01:17:34,897 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-21 01:17:34,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-21 01:17:35,113 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:17:35,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716698685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:17:35,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199964478] [2021-11-21 01:17:35,115 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:17:35,115 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:17:35,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:17:35,116 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:17:35,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:17:35,214 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:17:35,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:17:35,300 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:17:35,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:17:35,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:17:35,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:17:35,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:17:35,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:17:35,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:17:35,577 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:17:35,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:17:35,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:17:37,125 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:17:38,120 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:17:38,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:17:38,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 58, 56] total 171 [2021-11-21 01:17:38,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914375856] [2021-11-21 01:17:38,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:17:38,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 171 states [2021-11-21 01:17:38,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:17:38,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 171 interpolants. [2021-11-21 01:17:38,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=30041, Unknown=0, NotChecked=0, Total=30800 [2021-11-21 01:17:38,127 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 171 states, 171 states have (on average 1.0994152046783625) internal successors, (188), 171 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:06,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:06,782 INFO L93 Difference]: Finished difference Result 316 states and 364 transitions. [2021-11-21 01:18:06,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2021-11-21 01:18:06,788 INFO L78 Accepts]: Start accepts. Automaton has has 171 states, 171 states have (on average 1.0994152046783625) internal successors, (188), 171 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-21 01:18:06,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:06,790 INFO L225 Difference]: With dead ends: 316 [2021-11-21 01:18:06,791 INFO L226 Difference]: Without dead ends: 262 [2021-11-21 01:18:06,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 87 SyntacticMatches, 4 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21033 ImplicationChecksByTransitivity, 38.6s TimeCoverageRelationStatistics Valid=2118, Invalid=62144, Unknown=0, NotChecked=0, Total=64262 [2021-11-21 01:18:06,794 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 85 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 10264 mSolverCounterSat, 816 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 11080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 816 IncrementalHoareTripleChecker+Valid, 10264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:06,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 201 Invalid, 11080 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [816 Valid, 10264 Invalid, 0 Unknown, 0 Unchecked, 8.2s Time] [2021-11-21 01:18:06,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-21 01:18:06,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 151. [2021-11-21 01:18:06,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.1466666666666667) internal successors, (172), 150 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:06,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 172 transitions. [2021-11-21 01:18:06,842 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 172 transitions. Word has length 67 [2021-11-21 01:18:06,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:06,843 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 172 transitions. [2021-11-21 01:18:06,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 171 states, 171 states have (on average 1.0994152046783625) internal successors, (188), 171 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:06,843 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 172 transitions. [2021-11-21 01:18:06,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 01:18:06,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:06,845 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:06,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:18:07,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:07,065 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:07,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:07,066 INFO L85 PathProgramCache]: Analyzing trace with hash 357112902, now seen corresponding path program 16 times [2021-11-21 01:18:07,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:07,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077034790] [2021-11-21 01:18:07,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:07,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:07,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:07,234 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-21 01:18:07,234 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:07,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077034790] [2021-11-21 01:18:07,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077034790] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:18:07,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402092168] [2021-11-21 01:18:07,235 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:18:07,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:07,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:07,237 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:07,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:18:07,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:07,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:18:07,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:07,636 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-21 01:18:07,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:18:07,766 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-21 01:18:07,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402092168] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:18:07,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [528641926] [2021-11-21 01:18:07,768 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:18:07,768 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:18:07,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:18:07,768 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:18:07,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:18:07,853 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:18:07,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:18:07,907 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:18:07,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:18:07,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:18:08,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:18:08,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:18:08,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:18:08,100 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:18:08,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:18:08,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:18:09,517 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:18:09,719 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:18:09,719 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:18:09,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-21 01:18:09,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767253029] [2021-11-21 01:18:09,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:18:09,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:18:09,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:09,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:18:09,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=737, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:18:09,721 INFO L87 Difference]: Start difference. First operand 151 states and 172 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:10,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:10,212 INFO L93 Difference]: Finished difference Result 289 states and 333 transitions. [2021-11-21 01:18:10,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:18:10,213 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-21 01:18:10,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:10,214 INFO L225 Difference]: With dead ends: 289 [2021-11-21 01:18:10,214 INFO L226 Difference]: Without dead ends: 149 [2021-11-21 01:18:10,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=298, Invalid=1108, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:18:10,215 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 405 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 405 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:10,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 17 Invalid, 784 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [405 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:18:10,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-21 01:18:10,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 142. [2021-11-21 01:18:10,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.127659574468085) internal successors, (159), 141 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:10,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 159 transitions. [2021-11-21 01:18:10,256 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 159 transitions. Word has length 68 [2021-11-21 01:18:10,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:10,256 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 159 transitions. [2021-11-21 01:18:10,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:10,256 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 159 transitions. [2021-11-21 01:18:10,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 01:18:10,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:10,257 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:10,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:18:10,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:18:10,458 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:10,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:10,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1840229324, now seen corresponding path program 17 times [2021-11-21 01:18:10,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:10,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099401865] [2021-11-21 01:18:10,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:10,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:10,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:10,658 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-21 01:18:10,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:10,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099401865] [2021-11-21 01:18:10,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099401865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:18:10,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36424488] [2021-11-21 01:18:10,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:18:10,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:10,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:10,661 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:10,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:18:10,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:18:10,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:18:10,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:18:10,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:11,007 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-21 01:18:11,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:18:11,143 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-21 01:18:11,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36424488] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:18:11,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972398543] [2021-11-21 01:18:11,144 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:18:11,145 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:18:11,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:18:11,145 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:18:11,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:18:11,224 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:18:11,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:18:11,289 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:18:11,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:18:11,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:18:11,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:18:11,459 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:18:11,483 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:18:11,483 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 237 treesize of output 240 [2021-11-21 01:18:11,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:18:13,038 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:18:13,240 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:18:13,240 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:18:13,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-21 01:18:13,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614117279] [2021-11-21 01:18:13,241 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:18:13,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:18:13,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:13,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:18:13,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:18:13,242 INFO L87 Difference]: Start difference. First operand 142 states and 159 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 26 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:13,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:13,754 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2021-11-21 01:18:13,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:18:13,754 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 26 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-21 01:18:13,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:13,755 INFO L225 Difference]: With dead ends: 146 [2021-11-21 01:18:13,755 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 01:18:13,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=299, Invalid=1261, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:18:13,756 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:13,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 9 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:18:13,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 01:18:13,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 77. [2021-11-21 01:18:13,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:13,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2021-11-21 01:18:13,785 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2021-11-21 01:18:13,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:13,785 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2021-11-21 01:18:13,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 26 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:13,786 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2021-11-21 01:18:13,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 01:18:13,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:13,787 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:13,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-21 01:18:14,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:14,002 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:14,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:14,002 INFO L85 PathProgramCache]: Analyzing trace with hash 393114464, now seen corresponding path program 18 times [2021-11-21 01:18:14,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:14,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613771821] [2021-11-21 01:18:14,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:14,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:14,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:24,154 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 11 proven. 241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:18:24,154 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:24,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613771821] [2021-11-21 01:18:24,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613771821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:18:24,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789714545] [2021-11-21 01:18:24,154 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:18:24,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:24,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:24,156 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:24,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:18:24,250 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:18:24,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:18:24,255 WARN L261 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 245 conjunts are in the unsatisfiable core [2021-11-21 01:18:24,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:34,037 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 251 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:18:34,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:18:51,890 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-21 01:18:51,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2021-11-21 01:19:00,494 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-21 01:19:00,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2021-11-21 01:19:00,757 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:19:00,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789714545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:00,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301092914] [2021-11-21 01:19:00,759 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:19:00,759 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:00,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:00,760 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:00,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:19:00,857 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:19:00,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:19:00,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:19:00,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:19:01,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:19:01,062 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:19:01,083 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:19:01,084 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 233 treesize of output 236 [2021-11-21 01:19:01,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:19:02,572 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:19:04,036 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:19:04,036 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:19:04,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 67, 64] total 197 [2021-11-21 01:19:04,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718821111] [2021-11-21 01:19:04,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:19:04,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 197 states [2021-11-21 01:19:04,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:04,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2021-11-21 01:19:04,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=39860, Unknown=0, NotChecked=0, Total=40602 [2021-11-21 01:19:04,039 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 197 states, 197 states have (on average 1.0862944162436547) internal successors, (214), 197 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:19:55,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:55,655 INFO L93 Difference]: Finished difference Result 274 states and 310 transitions. [2021-11-21 01:19:55,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-21 01:19:55,656 INFO L78 Accepts]: Start accepts. Automaton has has 197 states, 197 states have (on average 1.0862944162436547) internal successors, (214), 197 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-21 01:19:55,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:55,658 INFO L225 Difference]: With dead ends: 274 [2021-11-21 01:19:55,658 INFO L226 Difference]: Without dead ends: 213 [2021-11-21 01:19:55,664 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 97 SyntacticMatches, 4 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19853 ImplicationChecksByTransitivity, 72.1s TimeCoverageRelationStatistics Valid=2634, Invalid=86468, Unknown=0, NotChecked=0, Total=89102 [2021-11-21 01:19:55,665 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 13843 mSolverCounterSat, 697 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 14540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 697 IncrementalHoareTripleChecker+Valid, 13843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:55,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 251 Invalid, 14540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [697 Valid, 13843 Invalid, 0 Unknown, 0 Unchecked, 11.9s Time] [2021-11-21 01:19:55,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-21 01:19:55,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 146. [2021-11-21 01:19:55,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 145 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:19:55,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 162 transitions. [2021-11-21 01:19:55,730 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 162 transitions. Word has length 76 [2021-11-21 01:19:55,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:55,731 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 162 transitions. [2021-11-21 01:19:55,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 197 states, 197 states have (on average 1.0862944162436547) internal successors, (214), 197 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:19:55,732 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 162 transitions. [2021-11-21 01:19:55,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 01:19:55,733 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:55,733 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:55,768 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-21 01:19:55,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:55,949 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:55,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:55,949 INFO L85 PathProgramCache]: Analyzing trace with hash -853010053, now seen corresponding path program 19 times [2021-11-21 01:19:55,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:55,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271948825] [2021-11-21 01:19:55,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:55,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:55,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:56,128 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:19:56,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:56,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271948825] [2021-11-21 01:19:56,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271948825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:56,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601019048] [2021-11-21 01:19:56,129 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:19:56,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:56,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:56,146 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:56,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:19:56,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:56,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:19:56,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:56,605 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:19:56,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:56,792 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:19:56,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601019048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:56,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710803364] [2021-11-21 01:19:56,794 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:19:56,794 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:56,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:56,794 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:56,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:19:56,907 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:19:56,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:19:56,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:19:57,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:19:57,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:19:57,110 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:19:57,136 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:19:57,136 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 237 treesize of output 240 [2021-11-21 01:19:57,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:19:58,460 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:19:58,656 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:19:58,656 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:19:58,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-21 01:19:58,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177232482] [2021-11-21 01:19:58,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:19:58,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:19:58,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:58,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:19:58,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=889, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:19:58,658 INFO L87 Difference]: Start difference. First operand 146 states and 162 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:19:59,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:59,184 INFO L93 Difference]: Finished difference Result 258 states and 289 transitions. [2021-11-21 01:19:59,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:19:59,185 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-21 01:19:59,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:59,186 INFO L225 Difference]: With dead ends: 258 [2021-11-21 01:19:59,186 INFO L226 Difference]: Without dead ends: 116 [2021-11-21 01:19:59,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=365, Invalid=1357, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:19:59,189 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 582 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 582 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:59,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 15 Invalid, 999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [582 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:59,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-21 01:19:59,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 109. [2021-11-21 01:19:59,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.1111111111111112) internal successors, (120), 108 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:19:59,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 120 transitions. [2021-11-21 01:19:59,229 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 120 transitions. Word has length 77 [2021-11-21 01:19:59,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:59,229 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 120 transitions. [2021-11-21 01:19:59,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:19:59,229 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 120 transitions. [2021-11-21 01:19:59,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 01:19:59,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:59,230 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:59,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:59,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-21 01:19:59,454 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:59,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:59,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1752202363, now seen corresponding path program 20 times [2021-11-21 01:19:59,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:59,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160016230] [2021-11-21 01:19:59,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:59,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:59,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:59,667 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-21 01:19:59,668 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:59,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160016230] [2021-11-21 01:19:59,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160016230] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:59,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727427985] [2021-11-21 01:19:59,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:19:59,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:59,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:59,675 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:59,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:19:59,797 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:19:59,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:19:59,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:19:59,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:20:00,050 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-21 01:20:00,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:20:00,201 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-21 01:20:00,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727427985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:20:00,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651236891] [2021-11-21 01:20:00,202 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:20:00,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:20:00,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:20:00,203 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:20:00,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:20:00,290 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:20:00,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:20:00,354 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:20:00,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:20:00,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:20:00,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:20:00,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:20:00,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:20:00,576 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:20:00,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:20:00,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:20:01,865 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:20:02,040 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:20:02,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:20:02,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-21 01:20:02,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246739608] [2021-11-21 01:20:02,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:20:02,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:20:02,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:20:02,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:20:02,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:20:02,042 INFO L87 Difference]: Start difference. First operand 109 states and 120 transitions. Second operand has 29 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 29 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:20:02,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:20:02,488 INFO L93 Difference]: Finished difference Result 113 states and 124 transitions. [2021-11-21 01:20:02,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:20:02,491 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 29 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-21 01:20:02,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:20:02,492 INFO L225 Difference]: With dead ends: 113 [2021-11-21 01:20:02,492 INFO L226 Difference]: Without dead ends: 86 [2021-11-21 01:20:02,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 234 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=364, Invalid=1528, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:20:02,493 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:20:02,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 17 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:20:02,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-21 01:20:02,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-21 01:20:02,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:20:02,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2021-11-21 01:20:02,525 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 81 [2021-11-21 01:20:02,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:20:02,526 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2021-11-21 01:20:02,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 29 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:20:02,526 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2021-11-21 01:20:02,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-21 01:20:02,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:20:02,527 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:20:02,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 01:20:02,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:02,750 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:20:02,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:20:02,750 INFO L85 PathProgramCache]: Analyzing trace with hash -651134475, now seen corresponding path program 21 times [2021-11-21 01:20:02,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:20:02,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726483233] [2021-11-21 01:20:02,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:02,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:20:03,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:20:15,388 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 22 proven. 302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:20:15,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:20:15,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726483233] [2021-11-21 01:20:15,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726483233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:20:15,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93874742] [2021-11-21 01:20:15,389 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:20:15,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:15,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:20:15,390 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:20:15,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:20:15,489 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:20:15,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:20:15,494 WARN L261 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 279 conjunts are in the unsatisfiable core [2021-11-21 01:20:15,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:20:29,432 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 323 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:20:29,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:20:58,457 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-21 01:20:58,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 717 [2021-11-21 01:21:09,033 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-21 01:21:09,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 54 [2021-11-21 01:21:09,369 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 01:21:09,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93874742] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:21:09,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1549205792] [2021-11-21 01:21:09,371 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:21:09,372 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:21:09,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:21:09,372 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:21:09,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:21:09,476 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:21:09,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:21:09,564 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:21:09,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:21:09,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:21:09,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:21:09,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:21:09,779 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:21:09,780 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 237 treesize of output 240 [2021-11-21 01:21:10,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:21:11,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:21:13,279 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:21:13,280 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:21:13,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 76, 72] total 223 [2021-11-21 01:21:13,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642090312] [2021-11-21 01:21:13,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:21:13,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 223 states [2021-11-21 01:21:13,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:21:13,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 223 interpolants. [2021-11-21 01:21:13,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=791, Invalid=50965, Unknown=0, NotChecked=0, Total=51756 [2021-11-21 01:21:13,292 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 223 states, 223 states have (on average 1.0762331838565022) internal successors, (240), 223 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:11,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:23:11,408 INFO L93 Difference]: Finished difference Result 352 states and 431 transitions. [2021-11-21 01:23:11,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-21 01:23:11,409 INFO L78 Accepts]: Start accepts. Automaton has has 223 states, 223 states have (on average 1.0762331838565022) internal successors, (240), 223 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-21 01:23:11,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:23:11,411 INFO L225 Difference]: With dead ends: 352 [2021-11-21 01:23:11,411 INFO L226 Difference]: Without dead ends: 348 [2021-11-21 01:23:11,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 107 SyntacticMatches, 4 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28738 ImplicationChecksByTransitivity, 141.6s TimeCoverageRelationStatistics Valid=5109, Invalid=127751, Unknown=0, NotChecked=0, Total=132860 [2021-11-21 01:23:11,420 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 284 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 23330 mSolverCounterSat, 4707 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 28037 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4707 IncrementalHoareTripleChecker+Valid, 23330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:23:11,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 269 Invalid, 28037 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4707 Valid, 23330 Invalid, 0 Unknown, 0 Unchecked, 24.0s Time] [2021-11-21 01:23:11,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-21 01:23:11,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 151. [2021-11-21 01:23:11,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.1666666666666667) internal successors, (175), 150 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:11,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 175 transitions. [2021-11-21 01:23:11,476 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 175 transitions. Word has length 85 [2021-11-21 01:23:11,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:23:11,477 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 175 transitions. [2021-11-21 01:23:11,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 223 states, 223 states have (on average 1.0762331838565022) internal successors, (240), 223 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:11,478 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 175 transitions. [2021-11-21 01:23:11,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-21 01:23:11,478 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:23:11,479 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:23:11,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 01:23:11,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 01:23:11,693 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:23:11,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:23:11,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1121098778, now seen corresponding path program 22 times [2021-11-21 01:23:11,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:23:11,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749031489] [2021-11-21 01:23:11,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:23:11,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:23:11,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:23:11,954 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 01:23:11,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:23:11,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749031489] [2021-11-21 01:23:11,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749031489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:23:11,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643859344] [2021-11-21 01:23:11,955 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:23:11,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:11,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:23:11,956 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:23:11,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 01:23:12,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:23:12,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:23:12,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:23:12,481 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 01:23:12,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:23:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 01:23:12,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643859344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:23:12,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1730751181] [2021-11-21 01:23:12,687 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:23:12,688 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:23:12,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:23:12,688 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:23:12,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:23:12,779 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:23:12,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:23:12,841 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:23:12,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:23:12,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:23:12,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:23:12,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:23:13,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:23:13,015 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:23:13,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:23:13,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:23:14,576 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:23:14,794 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:23:14,794 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:23:14,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-21 01:23:14,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589657046] [2021-11-21 01:23:14,794 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:23:14,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:23:14,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:23:14,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:23:14,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=1055, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:23:14,796 INFO L87 Difference]: Start difference. First operand 151 states and 175 transitions. Second operand has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:15,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:23:15,471 INFO L93 Difference]: Finished difference Result 376 states and 436 transitions. [2021-11-21 01:23:15,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:23:15,477 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-21 01:23:15,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:23:15,478 INFO L225 Difference]: With dead ends: 376 [2021-11-21 01:23:15,478 INFO L226 Difference]: Without dead ends: 173 [2021-11-21 01:23:15,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=439, Invalid=1631, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:23:15,480 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 472 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 472 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:23:15,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 17 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [472 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:23:15,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-21 01:23:15,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 166. [2021-11-21 01:23:15,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.1333333333333333) internal successors, (187), 165 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:15,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2021-11-21 01:23:15,542 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 86 [2021-11-21 01:23:15,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:23:15,542 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2021-11-21 01:23:15,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:15,543 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2021-11-21 01:23:15,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 01:23:15,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:23:15,544 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:23:15,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 01:23:15,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:15,761 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:23:15,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:23:15,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1393333712, now seen corresponding path program 23 times [2021-11-21 01:23:15,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:23:15,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602571217] [2021-11-21 01:23:15,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:23:15,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:23:15,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:23:16,010 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-21 01:23:16,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:23:16,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602571217] [2021-11-21 01:23:16,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602571217] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:23:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551025412] [2021-11-21 01:23:16,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:23:16,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:16,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:23:16,017 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:23:16,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 01:23:16,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 01:23:16,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:23:16,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:23:16,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:23:16,632 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-21 01:23:16,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:23:16,843 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-21 01:23:16,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551025412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:23:16,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [301828619] [2021-11-21 01:23:16,845 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:23:16,846 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:23:16,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:23:16,846 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:23:16,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:23:16,948 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:23:16,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:23:17,013 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:23:17,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:23:17,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:23:17,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:23:17,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:23:17,168 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:23:17,192 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:23:17,193 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 237 treesize of output 240 [2021-11-21 01:23:17,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:23:18,679 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:23:18,864 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:23:18,864 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:23:18,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-21 01:23:18,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517729257] [2021-11-21 01:23:18,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:23:18,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:23:18,865 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:23:18,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:23:18,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:23:18,866 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:19,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:23:19,429 INFO L93 Difference]: Finished difference Result 170 states and 191 transitions. [2021-11-21 01:23:19,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 01:23:19,429 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-21 01:23:19,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:23:19,430 INFO L225 Difference]: With dead ends: 170 [2021-11-21 01:23:19,431 INFO L226 Difference]: Without dead ends: 131 [2021-11-21 01:23:19,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 253 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=436, Invalid=1820, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:23:19,432 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:23:19,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 1016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:23:19,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-21 01:23:19,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 95. [2021-11-21 01:23:19,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:19,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2021-11-21 01:23:19,470 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 90 [2021-11-21 01:23:19,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:23:19,470 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2021-11-21 01:23:19,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:23:19,470 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2021-11-21 01:23:19,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 01:23:19,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:23:19,471 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:23:19,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 01:23:19,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:19,673 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:23:19,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:23:19,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1825812992, now seen corresponding path program 24 times [2021-11-21 01:23:19,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:23:19,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840881008] [2021-11-21 01:23:19,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:23:19,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:23:20,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:23:35,845 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 30 proven. 375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:23:35,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:23:35,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840881008] [2021-11-21 01:23:35,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840881008] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:23:35,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021602793] [2021-11-21 01:23:35,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:23:35,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:35,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:23:35,846 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:23:35,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 01:23:35,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:23:35,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:23:35,954 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 313 conjunts are in the unsatisfiable core [2021-11-21 01:23:35,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:23:52,465 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 404 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:23:52,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:24:17,953 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-21 01:24:17,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 906 [2021-11-21 01:24:37,550 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-21 01:24:37,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 59 [2021-11-21 01:24:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-21 01:24:37,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021602793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:24:37,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1028728495] [2021-11-21 01:24:37,812 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:24:37,812 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:24:37,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:24:37,812 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:24:37,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:24:37,897 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:24:37,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:24:37,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:24:38,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:24:38,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:24:38,110 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:24:38,129 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:24:38,129 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 233 treesize of output 236 [2021-11-21 01:24:38,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:24:39,692 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:24:41,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:24:41,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:24:41,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 85, 80] total 249 [2021-11-21 01:24:41,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285869486] [2021-11-21 01:24:41,195 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:24:41,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 249 states [2021-11-21 01:24:41,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:24:41,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 249 interpolants. [2021-11-21 01:24:41,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1461, Invalid=62801, Unknown=0, NotChecked=0, Total=64262 [2021-11-21 01:24:41,201 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 249 states, 249 states have (on average 1.0682730923694779) internal successors, (266), 249 states have internal predecessors, (266), 0 states have call successors, (0), 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 01:26:20,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:20,195 INFO L93 Difference]: Finished difference Result 296 states and 327 transitions. [2021-11-21 01:26:20,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2021-11-21 01:26:20,196 INFO L78 Accepts]: Start accepts. Automaton has has 249 states, 249 states have (on average 1.0682730923694779) internal successors, (266), 249 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-21 01:26:20,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:20,198 INFO L225 Difference]: With dead ends: 296 [2021-11-21 01:26:20,198 INFO L226 Difference]: Without dead ends: 262 [2021-11-21 01:26:20,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 117 SyntacticMatches, 4 SemanticMatches, 427 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59295 ImplicationChecksByTransitivity, 127.8s TimeCoverageRelationStatistics Valid=5656, Invalid=177956, Unknown=0, NotChecked=0, Total=183612 [2021-11-21 01:26:20,209 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 191 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 19083 mSolverCounterSat, 2325 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 21408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2325 IncrementalHoareTripleChecker+Valid, 19083 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:20,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 277 Invalid, 21408 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2325 Valid, 19083 Invalid, 0 Unknown, 0 Unchecked, 18.9s Time] [2021-11-21 01:26:20,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-21 01:26:20,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 159. [2021-11-21 01:26:20,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.1075949367088607) internal successors, (175), 158 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:20,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 175 transitions. [2021-11-21 01:26:20,293 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 175 transitions. Word has length 94 [2021-11-21 01:26:20,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:20,293 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 175 transitions. [2021-11-21 01:26:20,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 249 states, 249 states have (on average 1.0682730923694779) internal successors, (266), 249 states have internal predecessors, (266), 0 states have call successors, (0), 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 01:26:20,293 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 175 transitions. [2021-11-21 01:26:20,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 01:26:20,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:20,294 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:20,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:20,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 01:26:20,495 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:20,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:20,495 INFO L85 PathProgramCache]: Analyzing trace with hash -1022920357, now seen corresponding path program 25 times [2021-11-21 01:26:20,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:20,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309906331] [2021-11-21 01:26:20,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:20,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:20,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:20,789 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-21 01:26:20,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:20,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309906331] [2021-11-21 01:26:20,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309906331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:20,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061311445] [2021-11-21 01:26:20,790 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:26:20,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:20,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:20,791 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:20,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 01:26:20,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:20,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:26:20,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:21,389 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-21 01:26:21,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:21,575 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-21 01:26:21,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061311445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:21,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [852403470] [2021-11-21 01:26:21,577 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:26:21,577 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:21,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:21,578 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:21,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:21,690 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:26:21,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:26:21,757 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:26:21,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:26:21,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:26:21,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:21,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:21,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:21,949 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:26:21,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:26:22,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:26:23,396 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:23,611 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:23,611 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:23,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-21 01:26:23,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552085328] [2021-11-21 01:26:23,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:23,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:26:23,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:23,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:26:23,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1235, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:26:23,613 INFO L87 Difference]: Start difference. First operand 159 states and 175 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 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 01:26:24,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:24,460 INFO L93 Difference]: Finished difference Result 326 states and 361 transitions. [2021-11-21 01:26:24,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:26:24,470 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 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 95 [2021-11-21 01:26:24,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:24,471 INFO L225 Difference]: With dead ends: 326 [2021-11-21 01:26:24,471 INFO L226 Difference]: Without dead ends: 140 [2021-11-21 01:26:24,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=520, Invalid=1930, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:26:24,473 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 563 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 563 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:24,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 19 Invalid, 1256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [563 Valid, 693 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:26:24,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-21 01:26:24,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 133. [2021-11-21 01:26:24,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0909090909090908) internal successors, (144), 132 states have internal predecessors, (144), 0 states have call successors, (0), 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 01:26:24,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 144 transitions. [2021-11-21 01:26:24,535 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 144 transitions. Word has length 95 [2021-11-21 01:26:24,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:24,535 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 144 transitions. [2021-11-21 01:26:24,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 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 01:26:24,535 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 144 transitions. [2021-11-21 01:26:24,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 01:26:24,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:24,536 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:24,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:24,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 01:26:24,737 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:24,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:24,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1719675877, now seen corresponding path program 26 times [2021-11-21 01:26:24,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:24,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468790601] [2021-11-21 01:26:24,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:24,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:24,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:25,064 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 01:26:25,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:25,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468790601] [2021-11-21 01:26:25,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468790601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:25,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883347757] [2021-11-21 01:26:25,065 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:26:25,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:25,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:25,070 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:25,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 01:26:25,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 01:26:25,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:25,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:26:25,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:25,844 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 01:26:25,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:26,057 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 01:26:26,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883347757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:26,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [356809995] [2021-11-21 01:26:26,061 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 01:26:26,062 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:26,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:26,062 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:26,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:26,178 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-21 01:26:26,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-21 01:26:26,256 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-21 01:26:26,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-21 01:26:26,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 01:26:26,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:26,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:26,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:26,420 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:26:26,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 242 treesize of output 239 [2021-11-21 01:26:26,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:26:27,987 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:28,192 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:28,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:28,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-21 01:26:28,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495933666] [2021-11-21 01:26:28,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:28,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:26:28,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:28,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:26:28,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=1251, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:26:28,194 INFO L87 Difference]: Start difference. First operand 133 states and 144 transitions. Second operand has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:28,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:28,855 INFO L93 Difference]: Finished difference Result 137 states and 148 transitions. [2021-11-21 01:26:28,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:26:28,855 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-21 01:26:28,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:28,856 INFO L225 Difference]: With dead ends: 137 [2021-11-21 01:26:28,857 INFO L226 Difference]: Without dead ends: 104 [2021-11-21 01:26:28,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 278 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 891 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=515, Invalid=2137, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:26:28,858 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:28,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 13 Invalid, 1143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:26:28,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-21 01:26:28,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-21 01:26:28,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:28,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2021-11-21 01:26:28,930 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 99 [2021-11-21 01:26:28,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:28,931 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2021-11-21 01:26:28,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:28,931 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2021-11-21 01:26:28,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 01:26:28,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:28,932 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:28,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:29,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:29,148 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:29,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:29,149 INFO L85 PathProgramCache]: Analyzing trace with hash 700987349, now seen corresponding path program 27 times [2021-11-21 01:26:29,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:29,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169067615] [2021-11-21 01:26:29,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:29,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:29,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:52,280 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 44 proven. 451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:52,280 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:52,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169067615] [2021-11-21 01:26:52,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169067615] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:52,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096960368] [2021-11-21 01:26:52,280 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:26:52,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:52,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:52,281 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:52,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b27d3d77-2c7d-4426-b305-4cd1f6633694/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 01:26:52,452 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:26:52,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:52,459 WARN L261 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 347 conjunts are in the unsatisfiable core [2021-11-21 01:26:52,463 INFO L286 TraceCheckSpWp]: Computing forward predicates...