./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 751e67420c89b9d0e6d5639ea75482b8ab104ec2c6d8190aacf202ff4b3b3104 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:58:23,177 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:58:23,180 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:58:23,225 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:58:23,226 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:58:23,227 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:58:23,230 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:58:23,232 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:58:23,235 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:58:23,236 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:58:23,238 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:58:23,240 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:58:23,241 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:58:23,243 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:58:23,245 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:58:23,247 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:58:23,249 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:58:23,250 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:58:23,259 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:58:23,263 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:58:23,265 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:58:23,275 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:58:23,276 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:58:23,278 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:58:23,282 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:58:23,283 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:58:23,284 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:58:23,285 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:58:23,286 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:58:23,287 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:58:23,288 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:58:23,300 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:58:23,303 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:58:23,304 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:58:23,306 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:58:23,307 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:58:23,308 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:58:23,308 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:58:23,308 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:58:23,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:58:23,310 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:58:23,311 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:58:23,369 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:58:23,369 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:58:23,370 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:58:23,370 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:58:23,377 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:58:23,377 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:58:23,378 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:58:23,378 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:58:23,378 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:58:23,378 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:58:23,378 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:58:23,379 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:58:23,379 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:58:23,380 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:58:23,380 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:58:23,381 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:58:23,381 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:58:23,381 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:58:23,382 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:58:23,382 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:58:23,382 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:58:23,382 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:58:23,382 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:58:23,383 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:58:23,383 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:58:23,383 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:58:23,383 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:58:23,383 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:58:23,384 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:58:23,384 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:58:23,384 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:58:23,384 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:58:23,385 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:58:23,385 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:58:23,385 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:58:23,385 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:58:23,385 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:58:23,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:58:23,386 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:58:23,386 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:58:23,386 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:58:23,386 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_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 751e67420c89b9d0e6d5639ea75482b8ab104ec2c6d8190aacf202ff4b3b3104 [2021-11-23 02:58:23,658 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:58:23,678 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:58:23,681 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:58:23,682 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:58:23,683 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:58:23,684 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-2.i [2021-11-23 02:58:23,746 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/data/81653b962/d32944ad302b41ceac6d33498dac82d0/FLAGb9e5dcf49 [2021-11-23 02:58:24,255 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:58:24,256 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-2.i [2021-11-23 02:58:24,264 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/data/81653b962/d32944ad302b41ceac6d33498dac82d0/FLAGb9e5dcf49 [2021-11-23 02:58:24,731 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/data/81653b962/d32944ad302b41ceac6d33498dac82d0 [2021-11-23 02:58:24,734 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:58:24,735 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:58:24,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:58:24,737 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:58:24,749 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:58:24,750 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:58:24" (1/1) ... [2021-11-23 02:58:24,752 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f4276f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:24, skipping insertion in model container [2021-11-23 02:58:24,756 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:58:24" (1/1) ... [2021-11-23 02:58:24,761 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:58:24,786 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:58:24,966 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_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-2.i[832,845] [2021-11-23 02:58:24,989 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:58:24,996 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:58:25,007 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_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/sv-benchmarks/c/array-examples/data_structures_set_multi_proc_ground-2.i[832,845] [2021-11-23 02:58:25,018 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:58:25,031 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:58:25,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25 WrapperNode [2021-11-23 02:58:25,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:58:25,033 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:58:25,033 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:58:25,033 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:58:25,046 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,053 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,077 INFO L137 Inliner]: procedures = 18, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 137 [2021-11-23 02:58:25,078 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:58:25,078 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:58:25,079 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:58:25,079 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:58:25,087 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,087 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,091 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,091 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,103 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,105 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,108 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:58:25,109 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:58:25,109 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:58:25,109 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:58:25,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (1/1) ... [2021-11-23 02:58:25,128 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:58:25,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:25,150 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:58:25,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:58:25,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:58:25,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:58:25,196 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:58:25,196 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:58:25,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:58:25,196 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:58:25,196 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:58:25,197 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:58:25,197 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:58:25,197 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:58:25,283 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:58:25,285 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:58:25,507 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:58:25,603 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:58:25,603 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-23 02:58:25,606 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:58:25 BoogieIcfgContainer [2021-11-23 02:58:25,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:58:25,608 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:58:25,608 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:58:25,611 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:58:25,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:58:24" (1/3) ... [2021-11-23 02:58:25,614 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78e89adb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:58:25, skipping insertion in model container [2021-11-23 02:58:25,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:58:25" (2/3) ... [2021-11-23 02:58:25,615 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78e89adb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:58:25, skipping insertion in model container [2021-11-23 02:58:25,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:58:25" (3/3) ... [2021-11-23 02:58:25,617 INFO L111 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_ground-2.i [2021-11-23 02:58:25,626 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:58:25,627 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:58:25,684 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:58:25,694 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:58:25,695 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:58:25,715 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:58:25,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:58:25,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:25,722 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:25,723 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:25,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:25,730 INFO L85 PathProgramCache]: Analyzing trace with hash 825226196, now seen corresponding path program 1 times [2021-11-23 02:58:25,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:25,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977641182] [2021-11-23 02:58:25,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:25,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:25,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:25,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:58:25,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:25,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977641182] [2021-11-23 02:58:25,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977641182] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:58:25,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:58:25,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:58:25,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110834453] [2021-11-23 02:58:25,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:58:25,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:58:25,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:25,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:58:25,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:58:25,946 INFO L87 Difference]: Start difference. First operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:26,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:26,049 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2021-11-23 02:58:26,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:58:26,052 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 02:58:26,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:26,061 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:58:26,062 INFO L226 Difference]: Without dead ends: 35 [2021-11-23 02:58:26,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:58:26,069 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:26,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 26 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:58:26,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-23 02:58:26,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2021-11-23 02:58:26,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:58:26,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2021-11-23 02:58:26,168 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 8 [2021-11-23 02:58:26,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:26,169 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2021-11-23 02:58:26,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:26,171 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2021-11-23 02:58:26,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:58:26,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:26,173 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:26,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:58:26,174 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:26,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:26,180 INFO L85 PathProgramCache]: Analyzing trace with hash -224566578, now seen corresponding path program 1 times [2021-11-23 02:58:26,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:26,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547572849] [2021-11-23 02:58:26,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:26,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:26,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:26,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:58:26,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:26,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547572849] [2021-11-23 02:58:26,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547572849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:26,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437608876] [2021-11-23 02:58:26,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:26,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:26,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:26,281 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:26,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:58:26,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:26,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:58:26,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:26,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:58:26,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:26,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:58:26,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437608876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:26,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2103192722] [2021-11-23 02:58:26,495 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 02:58:26,495 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:26,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:26,512 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:26,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:26,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:26,642 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:58:26,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:58:26,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:26,692 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:26,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:26,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:26,784 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 34 treesize of output 36 [2021-11-23 02:58:26,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:26,949 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:26,982 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:26,985 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 204 treesize of output 203 [2021-11-23 02:58:27,189 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 25 treesize of output 21 [2021-11-23 02:58:27,213 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:27,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2103192722] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:58:27,245 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:27,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 8 [2021-11-23 02:58:27,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132057632] [2021-11-23 02:58:27,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:58:27,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:58:27,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:27,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:58:27,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:58:27,252 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:27,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:27,325 INFO L93 Difference]: Finished difference Result 43 states and 61 transitions. [2021-11-23 02:58:27,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:58:27,326 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 02:58:27,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:27,327 INFO L225 Difference]: With dead ends: 43 [2021-11-23 02:58:27,327 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 02:58:27,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:58:27,330 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:27,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:58:27,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 02:58:27,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-11-23 02:58:27,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:27,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2021-11-23 02:58:27,351 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 9 [2021-11-23 02:58:27,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:27,351 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2021-11-23 02:58:27,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:27,351 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2021-11-23 02:58:27,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:58:27,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:27,352 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:27,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:27,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:27,580 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:27,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:27,580 INFO L85 PathProgramCache]: Analyzing trace with hash -747487474, now seen corresponding path program 1 times [2021-11-23 02:58:27,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:27,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938460727] [2021-11-23 02:58:27,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:27,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:27,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:58:27,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:27,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938460727] [2021-11-23 02:58:27,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938460727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:27,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187183451] [2021-11-23 02:58:27,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:27,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:27,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:27,620 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:27,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:58:27,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:27,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:58:27,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:27,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:58:27,732 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:58:27,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187183451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:58:27,734 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:58:27,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:58:27,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984943739] [2021-11-23 02:58:27,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:58:27,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:58:27,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:27,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:58:27,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:58:27,737 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:27,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:27,789 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-23 02:58:27,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:58:27,790 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-23 02:58:27,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:27,793 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:58:27,793 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 02:58:27,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:58:27,805 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:27,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:58:27,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 02:58:27,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-11-23 02:58:27,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:27,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-11-23 02:58:27,811 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 15 [2021-11-23 02:58:27,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:27,811 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-11-23 02:58:27,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:27,812 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-11-23 02:58:27,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:58:27,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:27,813 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:27,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:28,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:28,040 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:28,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:28,041 INFO L85 PathProgramCache]: Analyzing trace with hash 1790313624, now seen corresponding path program 1 times [2021-11-23 02:58:28,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:28,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172220730] [2021-11-23 02:58:28,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:28,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:28,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:28,076 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:58:28,077 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:28,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172220730] [2021-11-23 02:58:28,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172220730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:28,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874136235] [2021-11-23 02:58:28,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:28,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:28,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:28,079 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:28,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:58:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:28,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:58:28,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:28,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:58:28,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:28,243 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:58:28,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874136235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:28,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553649027] [2021-11-23 02:58:28,249 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 02:58:28,250 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:28,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:28,251 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:28,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:28,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:28,325 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:28,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:28,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:28,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:58:28,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:28,378 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 39 treesize of output 41 [2021-11-23 02:58:28,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:28,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:28,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:28,472 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:58:28,473 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 214 treesize of output 202 [2021-11-23 02:58:28,548 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 25 treesize of output 21 [2021-11-23 02:58:28,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:28,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:28,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:58:28,686 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-23 02:58:28,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 126 treesize of output 127 [2021-11-23 02:58:28,793 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 25 treesize of output 21 [2021-11-23 02:58:28,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:28,873 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:58:28,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:58:29,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:29,146 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-23 02:58:29,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 215 treesize of output 239 [2021-11-23 02:58:29,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:29,806 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-23 02:58:29,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 215 treesize of output 239 [2021-11-23 02:58:30,193 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2021-11-23 02:58:30,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:31,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '552#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) (<= |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1| 0) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1|) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#set~0#1.offset_BEFORE_CALL_1| 4)))) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:58:31,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:31,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:31,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-23 02:58:31,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312698643] [2021-11-23 02:58:31,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:31,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:58:31,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:31,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:58:31,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:58:31,283 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:31,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:31,355 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2021-11-23 02:58:31,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:58:31,356 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 02:58:31,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:31,357 INFO L225 Difference]: With dead ends: 58 [2021-11-23 02:58:31,357 INFO L226 Difference]: Without dead ends: 40 [2021-11-23 02:58:31,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:58:31,359 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 45 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:31,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 35 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:58:31,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-23 02:58:31,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 24. [2021-11-23 02:58:31,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:31,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2021-11-23 02:58:31,365 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 16 [2021-11-23 02:58:31,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:31,365 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2021-11-23 02:58:31,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:31,366 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2021-11-23 02:58:31,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:58:31,366 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:31,366 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:31,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:31,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:31,581 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:31,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:31,582 INFO L85 PathProgramCache]: Analyzing trace with hash -1836899758, now seen corresponding path program 2 times [2021-11-23 02:58:31,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:31,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456397699] [2021-11-23 02:58:31,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:31,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:31,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:31,664 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:58:31,664 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:31,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456397699] [2021-11-23 02:58:31,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456397699] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:31,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225636064] [2021-11-23 02:58:31,665 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:58:31,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:31,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:31,672 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:31,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:58:31,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:58:31,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:31,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:58:31,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:31,770 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:58:31,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:31,817 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:58:31,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225636064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:31,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604111921] [2021-11-23 02:58:31,820 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-23 02:58:31,820 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:31,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:31,821 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:31,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:31,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:31,850 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:31,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:31,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:31,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:58:31,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:31,878 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 34 treesize of output 36 [2021-11-23 02:58:31,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:31,926 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:31,947 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:31,947 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 204 treesize of output 203 [2021-11-23 02:58:32,021 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 25 treesize of output 21 [2021-11-23 02:58:32,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:32,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:32,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:58:32,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:32,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 02:58:32,138 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 25 treesize of output 21 [2021-11-23 02:58:32,189 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:32,199 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:58:32,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:58:32,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:32,408 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-23 02:58:32,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 215 treesize of output 239 [2021-11-23 02:58:32,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:33,032 INFO L354 Elim1Store]: treesize reduction 143, result has 33.8 percent of original size [2021-11-23 02:58:33,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 215 treesize of output 239 [2021-11-23 02:58:33,201 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:34,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1604111921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:58:34,031 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:34,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 4, 4] total 17 [2021-11-23 02:58:34,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014546347] [2021-11-23 02:58:34,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:58:34,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:58:34,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:34,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:58:34,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=182, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:58:34,034 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:34,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:34,351 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-11-23 02:58:34,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:58:34,352 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 02:58:34,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:34,352 INFO L225 Difference]: With dead ends: 44 [2021-11-23 02:58:34,352 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 02:58:34,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=124, Invalid=218, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:58:34,354 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:34,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 37 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:58:34,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 02:58:34,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-23 02:58:34,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:34,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-23 02:58:34,361 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2021-11-23 02:58:34,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:34,361 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-23 02:58:34,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:34,361 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-23 02:58:34,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:58:34,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:34,362 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:34,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:34,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:34,565 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:34,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:34,566 INFO L85 PathProgramCache]: Analyzing trace with hash 930745131, now seen corresponding path program 1 times [2021-11-23 02:58:34,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:34,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493454726] [2021-11-23 02:58:34,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:34,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:34,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:58:34,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:34,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493454726] [2021-11-23 02:58:34,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493454726] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:34,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740746695] [2021-11-23 02:58:34,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:34,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:34,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:34,644 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:34,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:58:34,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:34,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:58:34,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:34,749 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:58:34,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:34,840 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:58:34,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740746695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:34,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107128877] [2021-11-23 02:58:34,845 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:58:34,846 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:34,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:34,846 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:34,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:34,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,888 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:34,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:34,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:58:34,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,924 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 39 treesize of output 41 [2021-11-23 02:58:34,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,979 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:58:34,979 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 214 treesize of output 202 [2021-11-23 02:58:35,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:58:35,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:35,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:35,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:58:35,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:35,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 02:58:35,131 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 25 treesize of output 21 [2021-11-23 02:58:35,309 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:35,310 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:35,332 INFO L354 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2021-11-23 02:58:35,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 191 treesize of output 172 [2021-11-23 02:58:35,928 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:35,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:36,168 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:36,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:36,527 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-23 02:58:36,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2021-11-23 02:58:36,755 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:58:36,769 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:37,567 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1095#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_2|) 4))) 1 0)))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:58:37,568 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:37,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:37,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-23 02:58:37,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287391984] [2021-11-23 02:58:37,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:37,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:58:37,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:37,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:58:37,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=429, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:58:37,570 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:37,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:37,705 INFO L93 Difference]: Finished difference Result 96 states and 135 transitions. [2021-11-23 02:58:37,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:58:37,706 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-23 02:58:37,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:37,711 INFO L225 Difference]: With dead ends: 96 [2021-11-23 02:58:37,712 INFO L226 Difference]: Without dead ends: 74 [2021-11-23 02:58:37,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=221, Invalid=429, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:58:37,715 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 91 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:37,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 48 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:58:37,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-23 02:58:37,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 34. [2021-11-23 02:58:37,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:37,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-23 02:58:37,744 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2021-11-23 02:58:37,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:37,744 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-23 02:58:37,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:37,745 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-23 02:58:37,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:58:37,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:37,747 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:37,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:37,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:58:37,961 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:37,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:37,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1129077397, now seen corresponding path program 2 times [2021-11-23 02:58:37,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:37,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706870137] [2021-11-23 02:58:37,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:37,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:38,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:38,174 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:58:38,174 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:38,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706870137] [2021-11-23 02:58:38,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706870137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:38,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851758431] [2021-11-23 02:58:38,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:58:38,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:38,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:38,175 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:38,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:58:38,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:58:38,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:38,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:58:38,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:38,302 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 02:58:38,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:38,363 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 02:58:38,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851758431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:38,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1342668946] [2021-11-23 02:58:38,366 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:58:38,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:38,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:38,366 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:38,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:38,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:38,391 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:58:38,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:58:38,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:38,409 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:38,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:38,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:38,437 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 34 treesize of output 36 [2021-11-23 02:58:38,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:38,477 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:38,495 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:38,496 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 204 treesize of output 203 [2021-11-23 02:58:38,566 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 25 treesize of output 21 [2021-11-23 02:58:38,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:38,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:38,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:58:38,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:38,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 02:58:38,669 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 25 treesize of output 21 [2021-11-23 02:58:38,865 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:38,876 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:58:38,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:58:39,204 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:39,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:39,525 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:39,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:39,838 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:39,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:39,962 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:58:39,975 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:40,685 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1520#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_3|) 4))) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:58:40,685 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:40,685 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:40,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 4, 4] total 17 [2021-11-23 02:58:40,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224156539] [2021-11-23 02:58:40,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:40,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:58:40,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:40,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:58:40,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=635, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:58:40,688 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:40,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:40,907 INFO L93 Difference]: Finished difference Result 120 states and 167 transitions. [2021-11-23 02:58:40,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:58:40,907 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 02:58:40,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:40,908 INFO L225 Difference]: With dead ends: 120 [2021-11-23 02:58:40,908 INFO L226 Difference]: Without dead ends: 98 [2021-11-23 02:58:40,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=303, Invalid=819, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 02:58:40,910 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 115 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:40,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 97 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:58:40,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-23 02:58:40,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 52. [2021-11-23 02:58:40,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 49 states have (on average 1.2857142857142858) internal successors, (63), 49 states have internal predecessors, (63), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:40,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2021-11-23 02:58:40,925 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 29 [2021-11-23 02:58:40,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:40,926 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2021-11-23 02:58:40,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:40,926 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2021-11-23 02:58:40,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 02:58:40,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:40,928 INFO L514 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:40,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:41,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:41,148 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:41,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:41,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1213378809, now seen corresponding path program 3 times [2021-11-23 02:58:41,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:41,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875768340] [2021-11-23 02:58:41,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:41,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:41,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:41,319 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:41,320 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:41,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875768340] [2021-11-23 02:58:41,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875768340] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:41,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431186224] [2021-11-23 02:58:41,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:58:41,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:41,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:41,321 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:41,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:58:41,394 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:58:41,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:41,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:58:41,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:41,456 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:41,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:41,690 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:41,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431186224] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:41,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1263363409] [2021-11-23 02:58:41,693 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:58:41,693 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:41,694 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:41,694 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:41,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:41,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:41,723 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:58:41,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 02:58:41,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:41,744 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:41,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:41,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:41,761 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 34 treesize of output 36 [2021-11-23 02:58:41,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:41,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:41,815 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:41,816 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 204 treesize of output 203 [2021-11-23 02:58:41,926 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 25 treesize of output 21 [2021-11-23 02:58:41,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:41,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:41,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:58:42,012 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-23 02:58:42,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 126 treesize of output 127 [2021-11-23 02:58:42,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:58:42,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:42,266 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:58:42,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:58:42,621 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:42,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:42,927 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:42,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:43,207 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:43,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:43,353 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:58:43,369 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:44,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2102#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_4|) 4))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:58:44,077 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:44,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:44,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2021-11-23 02:58:44,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703128910] [2021-11-23 02:58:44,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:44,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:58:44,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:44,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:58:44,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=940, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:58:44,081 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 26 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:44,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:44,380 INFO L93 Difference]: Finished difference Result 200 states and 286 transitions. [2021-11-23 02:58:44,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:58:44,381 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 26 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 02:58:44,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:44,382 INFO L225 Difference]: With dead ends: 200 [2021-11-23 02:58:44,382 INFO L226 Difference]: Without dead ends: 161 [2021-11-23 02:58:44,383 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=620, Invalid=940, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:58:44,384 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 170 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:44,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 76 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:58:44,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-23 02:58:44,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 65. [2021-11-23 02:58:44,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 62 states have internal predecessors, (76), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:44,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-23 02:58:44,404 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 39 [2021-11-23 02:58:44,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:44,405 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-23 02:58:44,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 26 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:44,405 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-23 02:58:44,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 02:58:44,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:44,407 INFO L514 BasicCegarLoop]: trace histogram [24, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:44,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:44,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:44,633 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:44,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:44,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1198289843, now seen corresponding path program 4 times [2021-11-23 02:58:44,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:44,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675712068] [2021-11-23 02:58:44,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:44,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:44,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:45,000 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:45,000 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:45,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675712068] [2021-11-23 02:58:45,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675712068] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:45,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796931489] [2021-11-23 02:58:45,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:58:45,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:45,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:45,001 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:45,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:58:45,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:45,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:58:45,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:45,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:45,942 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:45,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796931489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:45,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1555757534] [2021-11-23 02:58:45,945 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:58:45,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:45,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:45,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:45,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:45,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:45,971 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:45,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:45,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:45,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:58:45,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:45,995 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 34 treesize of output 36 [2021-11-23 02:58:46,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:46,033 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:46,051 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:46,051 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 204 treesize of output 203 [2021-11-23 02:58:46,114 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 25 treesize of output 21 [2021-11-23 02:58:46,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:46,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:46,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:58:46,202 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-23 02:58:46,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 126 treesize of output 127 [2021-11-23 02:58:46,254 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 25 treesize of output 21 [2021-11-23 02:58:46,418 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:46,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:46,444 INFO L354 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2021-11-23 02:58:46,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 191 treesize of output 172 [2021-11-23 02:58:46,916 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:46,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:47,138 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-23 02:58:47,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2021-11-23 02:58:47,507 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-23 02:58:47,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2021-11-23 02:58:47,690 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:58:47,703 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:48,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2951#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_5|) 0))) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:58:48,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:48,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:48,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-23 02:58:48,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717351602] [2021-11-23 02:58:48,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:48,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-23 02:58:48,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:48,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-23 02:58:48,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1881, Invalid=2409, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 02:58:48,702 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 52 states have internal predecessors, (68), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:49,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:49,340 INFO L93 Difference]: Finished difference Result 330 states and 481 transitions. [2021-11-23 02:58:49,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-23 02:58:49,340 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 52 states have internal predecessors, (68), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-23 02:58:49,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:49,342 INFO L225 Difference]: With dead ends: 330 [2021-11-23 02:58:49,343 INFO L226 Difference]: Without dead ends: 291 [2021-11-23 02:58:49,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1342 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1881, Invalid=2409, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 02:58:49,345 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 529 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 373 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:49,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 88 Invalid, 808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:58:49,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-23 02:58:49,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 91. [2021-11-23 02:58:49,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 88 states have (on average 1.1590909090909092) internal successors, (102), 88 states have internal predecessors, (102), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:49,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2021-11-23 02:58:49,374 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 52 [2021-11-23 02:58:49,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:49,374 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2021-11-23 02:58:49,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 52 states have internal predecessors, (68), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:49,375 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2021-11-23 02:58:49,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:58:49,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:49,377 INFO L514 BasicCegarLoop]: trace histogram [50, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:49,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:49,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:49,601 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:49,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:49,602 INFO L85 PathProgramCache]: Analyzing trace with hash -2085870963, now seen corresponding path program 5 times [2021-11-23 02:58:49,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:49,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080059936] [2021-11-23 02:58:49,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:49,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:49,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:50,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1307 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:58:50,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:50,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080059936] [2021-11-23 02:58:50,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080059936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:50,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178739936] [2021-11-23 02:58:50,956 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:58:50,956 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:50,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:50,957 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:50,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:58:51,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:58:51,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:51,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:58:51,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:51,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1307 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1297 trivial. 0 not checked. [2021-11-23 02:58:51,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:51,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1307 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1297 trivial. 0 not checked. [2021-11-23 02:58:51,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178739936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:51,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183115372] [2021-11-23 02:58:51,542 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:58:51,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:51,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:51,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:51,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:51,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:51,569 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:51,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:51,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:51,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:58:51,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:51,595 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 34 treesize of output 36 [2021-11-23 02:58:51,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:51,636 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:51,660 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:51,660 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 204 treesize of output 203 [2021-11-23 02:58:51,720 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 25 treesize of output 21 [2021-11-23 02:58:51,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:51,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:51,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:58:51,793 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-23 02:58:51,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 126 treesize of output 127 [2021-11-23 02:58:51,852 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 25 treesize of output 21 [2021-11-23 02:58:52,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:52,042 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:58:52,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:58:52,348 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:52,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:52,626 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:52,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:52,883 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:58:52,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:58:53,031 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:58:53,045 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:53,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4252#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6|) 0))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_6|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:58:53,940 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:53,940 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:53,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 7, 7] total 63 [2021-11-23 02:58:53,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072909613] [2021-11-23 02:58:53,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:53,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-23 02:58:53,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:53,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-23 02:58:53,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1946, Invalid=3754, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 02:58:53,944 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:54,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:54,872 INFO L93 Difference]: Finished difference Result 385 states and 543 transitions. [2021-11-23 02:58:54,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 02:58:54,873 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-23 02:58:54,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:54,876 INFO L225 Difference]: With dead ends: 385 [2021-11-23 02:58:54,876 INFO L226 Difference]: Without dead ends: 346 [2021-11-23 02:58:54,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1956 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2576, Invalid=4734, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 02:58:54,879 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 958 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 542 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1009 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 542 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:54,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1009 Valid, 338 Invalid, 1072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [542 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:58:54,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-23 02:58:54,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 140. [2021-11-23 02:58:54,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 137 states have (on average 1.2335766423357664) internal successors, (169), 137 states have internal predecessors, (169), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:58:54,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 171 transitions. [2021-11-23 02:58:54,910 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 171 transitions. Word has length 78 [2021-11-23 02:58:54,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:54,911 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 171 transitions. [2021-11-23 02:58:54,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:54,912 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 171 transitions. [2021-11-23 02:58:54,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 02:58:54,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:54,914 INFO L514 BasicCegarLoop]: trace histogram [51, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:54,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:55,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:58:55,129 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:58:55,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:55,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1807186329, now seen corresponding path program 6 times [2021-11-23 02:58:55,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:55,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533791045] [2021-11-23 02:58:55,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:55,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:55,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:56,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:58:56,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:56,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533791045] [2021-11-23 02:58:56,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533791045] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:56,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847394560] [2021-11-23 02:58:56,329 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:58:56,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:56,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:56,330 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:56,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:58:56,471 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:58:56,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:56,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-23 02:58:56,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:56,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:58:56,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:59,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:58:59,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847394560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:59,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121244225] [2021-11-23 02:58:59,570 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:58:59,571 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:59,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:59,571 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:59,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:59,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:59,604 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:58:59,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:58:59,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:59,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:58:59,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:59,627 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 34 treesize of output 36 [2021-11-23 02:58:59,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:59,689 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:58:59,710 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:58:59,710 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 204 treesize of output 203 [2021-11-23 02:58:59,785 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 25 treesize of output 21 [2021-11-23 02:58:59,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:58:59,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:58:59,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:58:59,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:59,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 02:58:59,892 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 25 treesize of output 21 [2021-11-23 02:59:00,090 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:59:00,101 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:59:00,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:59:00,344 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:59:00,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:59:00,697 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-23 02:59:00,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2021-11-23 02:59:01,250 INFO L354 Elim1Store]: treesize reduction 75, result has 44.9 percent of original size [2021-11-23 02:59:01,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 169 treesize of output 208 [2021-11-23 02:59:01,470 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:59:01,484 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:02,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5962#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7| Int)) (and (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7|) 4))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_7|))) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:59:02,530 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:02,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:02,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 106 [2021-11-23 02:59:02,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839660771] [2021-11-23 02:59:02,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:02,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-23 02:59:02,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:02,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-23 02:59:02,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6660, Invalid=7620, Unknown=0, NotChecked=0, Total=14280 [2021-11-23 02:59:02,537 INFO L87 Difference]: Start difference. First operand 140 states and 171 transitions. Second operand has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 106 states have internal predecessors, (122), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:04,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:04,923 INFO L93 Difference]: Finished difference Result 696 states and 1018 transitions. [2021-11-23 02:59:04,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-23 02:59:04,924 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 106 states have internal predecessors, (122), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 02:59:04,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:04,930 INFO L225 Difference]: With dead ends: 696 [2021-11-23 02:59:04,930 INFO L226 Difference]: Without dead ends: 609 [2021-11-23 02:59:04,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2746 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6660, Invalid=7620, Unknown=0, NotChecked=0, Total=14280 [2021-11-23 02:59:04,938 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 970 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 1003 mSolverCounterSat, 698 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1074 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 1701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 698 IncrementalHoareTripleChecker+Valid, 1003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:04,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1074 Valid, 163 Invalid, 1701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [698 Valid, 1003 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:59:04,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-11-23 02:59:04,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 193. [2021-11-23 02:59:04,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 190 states have (on average 1.168421052631579) internal successors, (222), 190 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:59:04,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 224 transitions. [2021-11-23 02:59:04,998 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 224 transitions. Word has length 103 [2021-11-23 02:59:04,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:04,999 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 224 transitions. [2021-11-23 02:59:04,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 106 states have internal predecessors, (122), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:04,999 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 224 transitions. [2021-11-23 02:59:05,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-23 02:59:05,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:05,003 INFO L514 BasicCegarLoop]: trace histogram [104, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:05,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:05,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:05,217 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:59:05,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:05,218 INFO L85 PathProgramCache]: Analyzing trace with hash -243063635, now seen corresponding path program 7 times [2021-11-23 02:59:05,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:05,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956075566] [2021-11-23 02:59:05,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:05,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:05,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:09,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5660 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:59:09,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:09,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956075566] [2021-11-23 02:59:09,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956075566] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:09,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782993208] [2021-11-23 02:59:09,502 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:59:09,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:09,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:09,503 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:09,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:59:09,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:09,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-23 02:59:09,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:09,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5660 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:59:09,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:21,256 INFO L134 CoverageAnalysis]: Checked inductivity of 5660 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:59:21,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782993208] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:21,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1117203216] [2021-11-23 02:59:21,258 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 02:59:21,258 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:59:21,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:59:21,258 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:59:21,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:59:21,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,279 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:59:21,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 02:59:21,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 02:59:21,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,303 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 34 treesize of output 36 [2021-11-23 02:59:21,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,341 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:59:21,359 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:59:21,359 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 204 treesize of output 203 [2021-11-23 02:59:21,427 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 25 treesize of output 21 [2021-11-23 02:59:21,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:59:21,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:59:21,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:59:21,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 02:59:21,529 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 25 treesize of output 21 [2021-11-23 02:59:21,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:59:21,684 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:59:21,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 02:59:21,954 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:59:21,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:59:22,320 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:59:22,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:59:22,518 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 02:59:22,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 02:59:22,622 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 02:59:22,636 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:23,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8745#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8| Int)) (and (= (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8|) 4))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_8|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:59:23,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:23,672 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:23,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2021-11-23 02:59:23,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991640576] [2021-11-23 02:59:23,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:23,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2021-11-23 02:59:23,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:23,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2021-11-23 02:59:23,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24521, Invalid=26329, Unknown=0, NotChecked=0, Total=50850 [2021-11-23 02:59:23,689 INFO L87 Difference]: Start difference. First operand 193 states and 224 transitions. Second operand has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 212 states have internal predecessors, (228), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:43,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:43,826 INFO L93 Difference]: Finished difference Result 1226 states and 1813 transitions. [2021-11-23 02:59:43,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-11-23 02:59:43,828 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 212 states have internal predecessors, (228), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-23 02:59:43,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:43,838 INFO L225 Difference]: With dead ends: 1226 [2021-11-23 02:59:43,839 INFO L226 Difference]: Without dead ends: 1139 [2021-11-23 02:59:43,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 348 SyntacticMatches, 0 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5502 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=24521, Invalid=26329, Unknown=0, NotChecked=0, Total=50850 [2021-11-23 02:59:43,845 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 2349 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 2229 mSolverCounterSat, 1839 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2559 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 4068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1839 IncrementalHoareTripleChecker+Valid, 2229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:43,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2559 Valid, 241 Invalid, 4068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1839 Valid, 2229 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:59:43,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1139 states. [2021-11-23 02:59:43,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1139 to 299. [2021-11-23 02:59:43,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 296 states have (on average 1.1081081081081081) internal successors, (328), 296 states have internal predecessors, (328), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:59:43,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 330 transitions. [2021-11-23 02:59:43,947 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 330 transitions. Word has length 156 [2021-11-23 02:59:43,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:43,947 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 330 transitions. [2021-11-23 02:59:43,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 212 states have internal predecessors, (228), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:43,948 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 330 transitions. [2021-11-23 02:59:43,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-23 02:59:43,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:43,953 INFO L514 BasicCegarLoop]: trace histogram [210, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:43,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:44,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:59:44,169 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:59:44,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:44,170 INFO L85 PathProgramCache]: Analyzing trace with hash -351003411, now seen corresponding path program 8 times [2021-11-23 02:59:44,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:44,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620229956] [2021-11-23 02:59:44,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:44,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:44,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:59,636 INFO L134 CoverageAnalysis]: Checked inductivity of 22355 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:59:59,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:59,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620229956] [2021-11-23 02:59:59,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620229956] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:59,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346362714] [2021-11-23 02:59:59,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:59:59,637 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:59,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:59,638 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:59,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:59:59,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:59:59,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:59:59,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:59:59,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:00:00,290 INFO L354 Elim1Store]: treesize reduction 45, result has 19.6 percent of original size [2021-11-23 03:00:00,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-23 03:00:00,832 INFO L354 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2021-11-23 03:00:00,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 3 [2021-11-23 03:00:01,163 INFO L134 CoverageAnalysis]: Checked inductivity of 22355 backedges. 50 proven. 3 refuted. 0 times theorem prover too weak. 22302 trivial. 0 not checked. [2021-11-23 03:00:01,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:00:02,159 INFO L134 CoverageAnalysis]: Checked inductivity of 22355 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 22304 trivial. 0 not checked. [2021-11-23 03:00:02,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346362714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:00:02,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [821602451] [2021-11-23 03:00:02,162 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 03:00:02,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:00:02,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:00:02,162 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:00:02,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:00:02,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:02,193 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:00:02,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:00:02,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:02,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-23 03:00:02,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:02,245 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 34 treesize of output 36 [2021-11-23 03:00:02,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:02,290 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:00:02,311 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:00:02,312 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 204 treesize of output 203 [2021-11-23 03:00:02,400 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 25 treesize of output 21 [2021-11-23 03:00:02,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:00:02,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:00:02,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 03:00:02,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:02,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 03:00:02,519 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 25 treesize of output 21 [2021-11-23 03:00:02,700 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:00:02,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:00:02,728 INFO L354 Elim1Store]: treesize reduction 52, result has 28.8 percent of original size [2021-11-23 03:00:02,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 191 treesize of output 172 [2021-11-23 03:00:03,040 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:00:03,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:00:03,308 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:00:03,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:00:03,538 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:00:03,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:00:03,640 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2021-11-23 03:00:03,651 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:00:04,849 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13342#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9|) 0))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_9|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:00:04,849 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:00:04,850 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:00:04,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 9, 7] total 225 [2021-11-23 03:00:04,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878934061] [2021-11-23 03:00:04,850 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:00:04,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 225 states [2021-11-23 03:00:04,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:00:04,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 225 interpolants. [2021-11-23 03:00:04,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24581, Invalid=31825, Unknown=0, NotChecked=0, Total=56406 [2021-11-23 03:00:04,860 INFO L87 Difference]: Start difference. First operand 299 states and 330 transitions. Second operand has 225 states, 225 states have (on average 1.1288888888888888) internal successors, (254), 225 states have internal predecessors, (254), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:01:18,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:01:18,511 INFO L93 Difference]: Finished difference Result 1332 states and 1860 transitions. [2021-11-23 03:01:18,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 653 states. [2021-11-23 03:01:18,511 INFO L78 Accepts]: Start accepts. Automaton has has 225 states, 225 states have (on average 1.1288888888888888) internal successors, (254), 225 states have internal predecessors, (254), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2021-11-23 03:01:18,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:01:18,521 INFO L225 Difference]: With dead ends: 1332 [2021-11-23 03:01:18,521 INFO L226 Difference]: Without dead ends: 1241 [2021-11-23 03:01:18,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1430 GetRequests, 761 SyntacticMatches, 0 SemanticMatches, 669 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106497 ImplicationChecksByTransitivity, 68.2s TimeCoverageRelationStatistics Valid=118587, Invalid=330983, Unknown=0, NotChecked=0, Total=449570 [2021-11-23 03:01:18,553 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 1306 mSDsluCounter, 1987 mSDsCounter, 0 mSdLazyCounter, 2630 mSolverCounterSat, 3706 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1517 SdHoareTripleChecker+Valid, 1817 SdHoareTripleChecker+Invalid, 6787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3706 IncrementalHoareTripleChecker+Valid, 2630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 451 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:01:18,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1517 Valid, 1817 Invalid, 6787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3706 Valid, 2630 Invalid, 0 Unknown, 451 Unchecked, 3.0s Time] [2021-11-23 03:01:18,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2021-11-23 03:01:18,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 317. [2021-11-23 03:01:18,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 314 states have (on average 1.1560509554140128) internal successors, (363), 314 states have internal predecessors, (363), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:01:18,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 365 transitions. [2021-11-23 03:01:18,644 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 365 transitions. Word has length 262 [2021-11-23 03:01:18,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:01:18,645 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 365 transitions. [2021-11-23 03:01:18,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 225 states, 225 states have (on average 1.1288888888888888) internal successors, (254), 225 states have internal predecessors, (254), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:01:18,646 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 365 transitions. [2021-11-23 03:01:18,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-23 03:01:18,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:01:18,650 INFO L514 BasicCegarLoop]: trace histogram [211, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:01:18,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:01:18,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:01:18,877 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:01:18,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:01:18,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1823100228, now seen corresponding path program 1 times [2021-11-23 03:01:18,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:01:18,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669828922] [2021-11-23 03:01:18,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:18,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:01:19,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:34,245 INFO L134 CoverageAnalysis]: Checked inductivity of 22576 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-23 03:01:34,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:01:34,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669828922] [2021-11-23 03:01:34,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669828922] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:01:34,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929380580] [2021-11-23 03:01:34,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:01:34,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:01:34,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:01:34,269 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:01:34,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:01:34,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:01:34,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 1692 conjuncts, 213 conjunts are in the unsatisfiable core [2021-11-23 03:01:34,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:01:35,102 INFO L134 CoverageAnalysis]: Checked inductivity of 22576 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-23 03:01:35,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:02:20,748 INFO L134 CoverageAnalysis]: Checked inductivity of 22576 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-23 03:02:20,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929380580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:02:20,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14545168] [2021-11-23 03:02:20,750 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 03:02:20,751 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:02:20,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:02:20,751 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:02:20,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:02:20,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:02:20,778 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:02:20,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 03:02:20,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:02:20,801 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:02:20,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:02:20,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:02:20,820 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 34 treesize of output 36 [2021-11-23 03:02:20,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:02:20,863 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:02:20,887 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 03:02:20,887 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 204 treesize of output 203 [2021-11-23 03:02:20,982 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 25 treesize of output 21 [2021-11-23 03:02:20,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:02:21,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:02:21,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 03:02:21,054 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-23 03:02:21,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 126 treesize of output 127 [2021-11-23 03:02:21,113 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 25 treesize of output 21 [2021-11-23 03:02:21,165 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:02:21,174 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 03:02:21,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 03:02:21,279 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:02:21,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:02:21,347 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:02:21,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:02:21,522 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:02:21,535 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:02:22,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19241#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_10|) 0))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:02:22,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:02:22,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:02:22,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [213, 213, 213] total 426 [2021-11-23 03:02:22,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815320939] [2021-11-23 03:02:22,594 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:02:22,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 427 states [2021-11-23 03:02:22,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:22,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 427 interpolants. [2021-11-23 03:02:22,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94816, Invalid=98344, Unknown=0, NotChecked=0, Total=193160 [2021-11-23 03:02:22,617 INFO L87 Difference]: Start difference. First operand 317 states and 365 transitions. Second operand has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 426 states have internal predecessors, (442), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:08:23,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:23,400 INFO L93 Difference]: Finished difference Result 2330 states and 3486 transitions. [2021-11-23 03:08:23,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 426 states. [2021-11-23 03:08:23,401 INFO L78 Accepts]: Start accepts. Automaton has has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 426 states have internal predecessors, (442), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 264 [2021-11-23 03:08:23,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:23,418 INFO L225 Difference]: With dead ends: 2330 [2021-11-23 03:08:23,418 INFO L226 Difference]: Without dead ends: 2226 [2021-11-23 03:08:23,436 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1003 GetRequests, 565 SyntacticMatches, 0 SemanticMatches, 438 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11058 ImplicationChecksByTransitivity, 60.7s TimeCoverageRelationStatistics Valid=94816, Invalid=98344, Unknown=0, NotChecked=0, Total=193160 [2021-11-23 03:08:23,436 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 5957 mSDsluCounter, 714 mSDsCounter, 0 mSdLazyCounter, 4742 mSolverCounterSat, 4999 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6381 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 9741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4999 IncrementalHoareTripleChecker+Valid, 4742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:23,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6381 Valid, 455 Invalid, 9741 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4999 Valid, 4742 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 03:08:23,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2226 states. [2021-11-23 03:08:23,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2226 to 530. [2021-11-23 03:08:23,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 527 states have (on average 1.092979127134725) internal successors, (576), 527 states have internal predecessors, (576), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:08:23,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 578 transitions. [2021-11-23 03:08:23,694 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 578 transitions. Word has length 264 [2021-11-23 03:08:23,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:23,695 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 578 transitions. [2021-11-23 03:08:23,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 426 states have internal predecessors, (442), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:08:23,697 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 578 transitions. [2021-11-23 03:08:23,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2021-11-23 03:08:23,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:23,710 INFO L514 BasicCegarLoop]: trace histogram [424, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:08:23,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:23,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:23,925 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:23,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:23,926 INFO L85 PathProgramCache]: Analyzing trace with hash 263786806, now seen corresponding path program 2 times [2021-11-23 03:08:23,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:23,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359578463] [2021-11-23 03:08:23,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:23,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:25,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:09:38,075 INFO L134 CoverageAnalysis]: Checked inductivity of 90310 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-23 03:09:38,075 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:09:38,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359578463] [2021-11-23 03:09:38,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359578463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:09:38,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391900045] [2021-11-23 03:09:38,076 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:09:38,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:09:38,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:09:38,077 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:09:38,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af7aac59-aa7f-4d57-b7c7-3d2d81fda282/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:09:38,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:09:38,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:09:38,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 03:09:38,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:09:40,264 INFO L354 Elim1Store]: treesize reduction 69, result has 35.5 percent of original size [2021-11-23 03:09:40,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 54 [2021-11-23 03:09:41,088 INFO L354 Elim1Store]: treesize reduction 88, result has 3.3 percent of original size [2021-11-23 03:09:41,088 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 85 treesize of output 50 [2021-11-23 03:09:41,661 INFO L134 CoverageAnalysis]: Checked inductivity of 90310 backedges. 37 proven. 1 refuted. 0 times theorem prover too weak. 90272 trivial. 0 not checked. [2021-11-23 03:09:41,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:09:45,959 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 03:09:45,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 1 [2021-11-23 03:09:46,529 INFO L134 CoverageAnalysis]: Checked inductivity of 90310 backedges. 37 proven. 1 refuted. 0 times theorem prover too weak. 90272 trivial. 0 not checked. [2021-11-23 03:09:46,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391900045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:09:46,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816571043] [2021-11-23 03:09:46,531 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-23 03:09:46,532 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:09:46,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:09:46,532 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:09:46,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:09:46,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,559 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:09:46,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-23 03:09:46,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,588 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 03:09:46,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-23 03:09:46,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,608 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 39 treesize of output 41 [2021-11-23 03:09:46,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,664 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 03:09:46,665 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 214 treesize of output 202 [2021-11-23 03:09:46,697 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 25 treesize of output 21 [2021-11-23 03:09:46,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 03:09:46,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:09:46,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 03:09:46,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:09:46,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 126 [2021-11-23 03:09:46,795 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 25 treesize of output 21 [2021-11-23 03:09:46,863 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:09:46,874 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 03:09:46,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 30 [2021-11-23 03:09:47,004 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:09:47,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:09:47,127 INFO L354 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2021-11-23 03:09:47,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 03:09:47,197 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:09:47,215 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:09:49,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27777#(and (exists ((|v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) (= |__VERIFIER_assert_#in~cond| (ite (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#set~0#1.base_BEFORE_CALL_11|) 4))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:09:49,388 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:09:49,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:09:49,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [426, 12, 12] total 445 [2021-11-23 03:09:49,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980725793] [2021-11-23 03:09:49,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:09:49,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 445 states [2021-11-23 03:09:49,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:09:49,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 445 interpolants. [2021-11-23 03:09:49,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95757, Invalid=113549, Unknown=0, NotChecked=0, Total=209306 [2021-11-23 03:09:49,418 INFO L87 Difference]: Start difference. First operand 530 states and 578 transitions. Second operand has 445 states, 444 states have (on average 1.072072072072072) internal successors, (476), 444 states have internal predecessors, (476), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)