./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_copy3_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_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/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_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_copy3_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/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_8c4446f1-9507-49a0-aeac-26a8373d2031/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 217f19c8e5e57d916627a12a8c23c5343b3d451054ddc6d3d6dc70e40dff121a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:57:12,977 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:57:12,979 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:57:13,036 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:57:13,036 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:57:13,042 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:57:13,044 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:57:13,049 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:57:13,052 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:57:13,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:57:13,062 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:57:13,064 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:57:13,065 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:57:13,068 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:57:13,070 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:57:13,077 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:57:13,082 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:57:13,084 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:57:13,086 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:57:13,093 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:57:13,096 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:57:13,098 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:57:13,101 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:57:13,103 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:57:13,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:57:13,110 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:57:13,111 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:57:13,113 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:57:13,114 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:57:13,116 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:57:13,117 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:57:13,118 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:57:13,120 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:57:13,122 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:57:13,124 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:57:13,124 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:57:13,125 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:57:13,125 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:57:13,126 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:57:13,127 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:57:13,128 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:57:13,129 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 01:57:13,172 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:57:13,172 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:57:13,172 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:57:13,173 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:57:13,174 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:57:13,174 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:57:13,174 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:57:13,175 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:57:13,175 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:57:13,175 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 01:57:13,175 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:57:13,176 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:57:13,176 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 01:57:13,176 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 01:57:13,176 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:57:13,177 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 01:57:13,177 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 01:57:13,177 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 01:57:13,178 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:57:13,178 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 01:57:13,179 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:57:13,179 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 01:57:13,179 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:57:13,180 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 01:57:13,180 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:57:13,180 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 01:57:13,180 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 01:57:13,181 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 01:57:13,181 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:57:13,181 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 01:57:13,181 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:57:13,182 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:57:13,182 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:57:13,182 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:57:13,183 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:57:13,183 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 01:57:13,183 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 01:57:13,183 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 01:57:13,184 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 01:57:13,184 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:57:13,184 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:57:13,184 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_8c4446f1-9507-49a0-aeac-26a8373d2031/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 217f19c8e5e57d916627a12a8c23c5343b3d451054ddc6d3d6dc70e40dff121a [2021-11-23 01:57:13,552 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:57:13,581 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:57:13,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:57:13,586 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:57:13,587 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:57:13,588 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-examples/standard_copy3_ground-2.i [2021-11-23 01:57:13,677 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/data/9f93d5d34/e782975f8fbf41c581ed899c4f4ef30c/FLAG5139afe0b [2021-11-23 01:57:14,219 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:57:14,221 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/sv-benchmarks/c/array-examples/standard_copy3_ground-2.i [2021-11-23 01:57:14,232 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/data/9f93d5d34/e782975f8fbf41c581ed899c4f4ef30c/FLAG5139afe0b [2021-11-23 01:57:14,560 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/data/9f93d5d34/e782975f8fbf41c581ed899c4f4ef30c [2021-11-23 01:57:14,563 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:57:14,564 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:57:14,566 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:57:14,566 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:57:14,569 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:57:14,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,571 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@644a66b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14, skipping insertion in model container [2021-11-23 01:57:14,571 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,579 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:57:14,595 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:57:14,810 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_8c4446f1-9507-49a0-aeac-26a8373d2031/sv-benchmarks/c/array-examples/standard_copy3_ground-2.i[816,829] [2021-11-23 01:57:14,828 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:57:14,837 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 01:57:14,850 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_8c4446f1-9507-49a0-aeac-26a8373d2031/sv-benchmarks/c/array-examples/standard_copy3_ground-2.i[816,829] [2021-11-23 01:57:14,860 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:57:14,874 INFO L208 MainTranslator]: Completed translation [2021-11-23 01:57:14,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14 WrapperNode [2021-11-23 01:57:14,875 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:57:14,876 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 01:57:14,876 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 01:57:14,876 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 01:57:14,884 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,891 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,914 INFO L137 Inliner]: procedures = 16, calls = 29, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 99 [2021-11-23 01:57:14,914 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 01:57:14,915 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 01:57:14,915 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 01:57:14,915 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 01:57:14,925 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,925 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,928 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,929 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,935 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,940 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,941 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,944 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 01:57:14,945 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 01:57:14,945 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 01:57:14,946 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 01:57:14,953 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (1/1) ... [2021-11-23 01:57:14,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:57:14,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:15,003 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 01:57:15,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 01:57:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 01:57:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 01:57:15,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 01:57:15,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 01:57:15,049 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 01:57:15,049 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 01:57:15,049 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 01:57:15,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 01:57:15,136 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 01:57:15,138 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 01:57:15,330 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 01:57:15,365 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 01:57:15,365 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-23 01:57:15,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:57:15 BoogieIcfgContainer [2021-11-23 01:57:15,368 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 01:57:15,370 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 01:57:15,370 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 01:57:15,388 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 01:57:15,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:57:14" (1/3) ... [2021-11-23 01:57:15,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d049681 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:57:15, skipping insertion in model container [2021-11-23 01:57:15,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:14" (2/3) ... [2021-11-23 01:57:15,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d049681 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:57:15, skipping insertion in model container [2021-11-23 01:57:15,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:57:15" (3/3) ... [2021-11-23 01:57:15,391 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy3_ground-2.i [2021-11-23 01:57:15,397 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 01:57:15,397 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 01:57:15,465 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 01:57:15,473 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 01:57:15,473 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 01:57:15,488 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:15,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 01:57:15,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:15,495 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:15,495 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:15,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:15,511 INFO L85 PathProgramCache]: Analyzing trace with hash 138745506, now seen corresponding path program 1 times [2021-11-23 01:57:15,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:15,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679865937] [2021-11-23 01:57:15,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:15,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:15,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:15,714 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 01:57:15,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:15,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679865937] [2021-11-23 01:57:15,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679865937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:15,716 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:15,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 01:57:15,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583800380] [2021-11-23 01:57:15,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:15,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:57:15,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:15,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:57:15,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:57:15,772 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:15,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:15,821 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2021-11-23 01:57:15,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:57:15,823 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 01:57:15,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:15,833 INFO L225 Difference]: With dead ends: 21 [2021-11-23 01:57:15,833 INFO L226 Difference]: Without dead ends: 11 [2021-11-23 01:57:15,836 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 01:57:15,841 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:15,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:57:15,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-23 01:57:15,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-23 01:57:15,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:15,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2021-11-23 01:57:15,877 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 8 [2021-11-23 01:57:15,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:15,877 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2021-11-23 01:57:15,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:15,878 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2021-11-23 01:57:15,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 01:57:15,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:15,879 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:15,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 01:57:15,879 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:15,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:15,881 INFO L85 PathProgramCache]: Analyzing trace with hash -1942781126, now seen corresponding path program 1 times [2021-11-23 01:57:15,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:15,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914910686] [2021-11-23 01:57:15,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:15,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:15,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:15,935 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 01:57:15,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:15,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914910686] [2021-11-23 01:57:15,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914910686] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:15,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009606532] [2021-11-23 01:57:15,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:15,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:15,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:15,942 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:15,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 01:57:16,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:16,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 01:57:16,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:57:16,079 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 01:57:16,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009606532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:16,080 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 01:57:16,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 01:57:16,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052372920] [2021-11-23 01:57:16,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:16,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:57:16,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:16,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:57:16,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:57:16,084 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:16,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:16,128 INFO L93 Difference]: Finished difference Result 21 states and 30 transitions. [2021-11-23 01:57:16,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:57:16,129 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 01:57:16,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:16,130 INFO L225 Difference]: With dead ends: 21 [2021-11-23 01:57:16,130 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 01:57:16,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 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 01:57:16,133 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:16,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:57:16,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 01:57:16,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-23 01:57:16,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:16,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2021-11-23 01:57:16,139 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 9 [2021-11-23 01:57:16,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:16,139 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2021-11-23 01:57:16,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:16,140 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2021-11-23 01:57:16,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 01:57:16,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:16,141 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:16,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:16,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:16,365 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:16,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:16,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1294728835, now seen corresponding path program 1 times [2021-11-23 01:57:16,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:16,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461239646] [2021-11-23 01:57:16,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:16,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:16,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:16,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:57:16,421 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:16,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461239646] [2021-11-23 01:57:16,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461239646] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:16,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861359378] [2021-11-23 01:57:16,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:16,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:16,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:16,433 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:16,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 01:57:16,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:16,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 01:57:16,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:16,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:57:16,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:16,573 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:57:16,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861359378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:16,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157208700] [2021-11-23 01:57:16,595 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:16,595 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:16,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:16,606 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:16,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:16,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,847 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:57:16,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:57:16,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:16,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:17,027 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:17,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:17,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:17,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:17,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-23 01:57:17,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:17,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:17,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:17,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:17,534 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:17,641 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-23 01:57:17,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 440 treesize of output 430 [2021-11-23 01:57:18,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:18,598 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:18,599 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:18,661 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:18,661 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 15 treesize of output 15 [2021-11-23 01:57:18,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:18,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:18,812 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:18,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:18,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:18,922 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:18,923 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 25 treesize of output 25 [2021-11-23 01:57:18,959 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:18,960 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 15 treesize of output 15 [2021-11-23 01:57:19,007 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,009 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,062 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:57:19,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:57:19,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,153 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:19,154 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 25 treesize of output 25 [2021-11-23 01:57:19,180 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,192 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:19,193 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 25 treesize of output 25 [2021-11-23 01:57:19,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:19,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:19,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:19,256 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,274 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:19,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:19,314 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:19,324 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:19,325 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 25 treesize of output 25 [2021-11-23 01:57:19,348 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:19,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '223#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:19,557 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:19,557 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:19,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-23 01:57:19,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304396484] [2021-11-23 01:57:19,558 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:19,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 01:57:19,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:19,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 01:57:19,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:57:19,560 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:19,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:19,606 INFO L93 Difference]: Finished difference Result 28 states and 38 transitions. [2021-11-23 01:57:19,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:57:19,607 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 01:57:19,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:19,608 INFO L225 Difference]: With dead ends: 28 [2021-11-23 01:57:19,608 INFO L226 Difference]: Without dead ends: 17 [2021-11-23 01:57:19,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:57:19,609 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:19,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:57:19,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-23 01:57:19,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-23 01:57:19,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:19,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-23 01:57:19,615 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2021-11-23 01:57:19,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:19,615 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-23 01:57:19,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:19,615 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-23 01:57:19,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 01:57:19,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:19,616 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:19,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:19,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:19,841 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:19,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:19,842 INFO L85 PathProgramCache]: Analyzing trace with hash 387492891, now seen corresponding path program 2 times [2021-11-23 01:57:19,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:19,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659155226] [2021-11-23 01:57:19,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:19,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:19,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:19,948 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 01:57:19,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:19,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659155226] [2021-11-23 01:57:19,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659155226] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:19,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731767210] [2021-11-23 01:57:19,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:19,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:19,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:19,950 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:19,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 01:57:20,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 01:57:20,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:20,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 01:57:20,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:20,083 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 01:57:20,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:20,122 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 01:57:20,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731767210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:20,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1248060137] [2021-11-23 01:57:20,126 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:20,127 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:20,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:20,127 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:20,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:20,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,258 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:57:20,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:57:20,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,431 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:20,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:20,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-23 01:57:20,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:20,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:20,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:20,727 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-23 01:57:20,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 460 treesize of output 428 [2021-11-23 01:57:20,852 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:20,864 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:20,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:20,915 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:20,915 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 15 treesize of output 15 [2021-11-23 01:57:20,957 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:20,958 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,016 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:21,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:21,076 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,086 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:21,086 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 25 treesize of output 25 [2021-11-23 01:57:21,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,119 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:21,120 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 25 treesize of output 25 [2021-11-23 01:57:21,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:21,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:21,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:21,161 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,177 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:21,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:21,223 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,232 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:21,233 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 25 treesize of output 25 [2021-11-23 01:57:21,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,265 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:21,266 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 25 treesize of output 25 [2021-11-23 01:57:21,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:21,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:21,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:21,315 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,316 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,329 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:21,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:21,369 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:21,380 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:21,381 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 25 treesize of output 25 [2021-11-23 01:57:21,406 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:21,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '395#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:21,617 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:21,617 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:21,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-23 01:57:21,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751737000] [2021-11-23 01:57:21,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:21,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 01:57:21,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:21,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 01:57:21,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:57:21,619 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:21,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:21,693 INFO L93 Difference]: Finished difference Result 35 states and 50 transitions. [2021-11-23 01:57:21,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:57:21,694 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-23 01:57:21,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:21,695 INFO L225 Difference]: With dead ends: 35 [2021-11-23 01:57:21,695 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 01:57:21,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:57:21,697 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:21,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:21,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 01:57:21,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 01:57:21,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:21,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-23 01:57:21,704 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 15 [2021-11-23 01:57:21,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:21,705 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-23 01:57:21,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:21,706 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-23 01:57:21,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 01:57:21,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:21,707 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:21,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:21,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:21,925 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:21,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:21,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1477020446, now seen corresponding path program 3 times [2021-11-23 01:57:21,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:21,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698820079] [2021-11-23 01:57:21,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:21,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:22,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:22,072 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:22,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:22,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698820079] [2021-11-23 01:57:22,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698820079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:22,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594199299] [2021-11-23 01:57:22,073 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:22,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:22,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:22,077 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:22,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 01:57:22,139 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:22,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:22,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 01:57:22,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:22,188 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:22,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:22,278 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:22,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594199299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:22,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459424537] [2021-11-23 01:57:22,284 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:22,285 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:22,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:22,285 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:22,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:22,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,434 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:22,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:22,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 19 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 37 [2021-11-23 01:57:22,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-23 01:57:22,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:22,641 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:22,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:22,643 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:22,723 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-23 01:57:22,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 440 treesize of output 430 [2021-11-23 01:57:23,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,044 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:23,045 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:23,077 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,086 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:23,087 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 25 treesize of output 25 [2021-11-23 01:57:23,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:23,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:23,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:23,127 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,128 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,140 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:23,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:23,168 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,177 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:23,178 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 25 treesize of output 25 [2021-11-23 01:57:23,205 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:23,209 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 15 treesize of output 15 [2021-11-23 01:57:23,241 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,242 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,294 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:57:23,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:57:23,357 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,366 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:23,367 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 25 treesize of output 25 [2021-11-23 01:57:23,396 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:23,396 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 15 treesize of output 15 [2021-11-23 01:57:23,429 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,430 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,485 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:57:23,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:57:23,550 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:23,563 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:23,564 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 25 treesize of output 25 [2021-11-23 01:57:23,588 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:23,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '659#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:23,853 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:23,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:23,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-23 01:57:23,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216893054] [2021-11-23 01:57:23,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:23,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 01:57:23,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:23,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 01:57:23,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2021-11-23 01:57:23,855 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:23,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:23,908 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2021-11-23 01:57:23,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 01:57:23,909 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-23 01:57:23,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:23,911 INFO L225 Difference]: With dead ends: 52 [2021-11-23 01:57:23,911 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 01:57:23,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2021-11-23 01:57:23,915 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:23,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:57:23,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 01:57:23,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-23 01:57:23,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:23,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-11-23 01:57:23,935 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 24 [2021-11-23 01:57:23,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:23,935 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-11-23 01:57:23,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:23,936 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-11-23 01:57:23,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 01:57:23,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:23,938 INFO L514 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:23,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:24,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:24,156 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:24,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:24,156 INFO L85 PathProgramCache]: Analyzing trace with hash 993193442, now seen corresponding path program 4 times [2021-11-23 01:57:24,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:24,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513325965] [2021-11-23 01:57:24,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:24,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:24,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:24,413 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:24,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:24,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513325965] [2021-11-23 01:57:24,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513325965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:24,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711762778] [2021-11-23 01:57:24,414 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 01:57:24,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:24,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:24,415 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:24,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 01:57:24,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:24,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:57:24,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:24,620 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:24,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:24,912 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:24,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711762778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:24,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777992507] [2021-11-23 01:57:24,915 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:24,915 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:24,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:24,915 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:24,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:24,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:24,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:24,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:24,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,098 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:25,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:25,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 19 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 37 [2021-11-23 01:57:25,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-23 01:57:25,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:25,324 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:25,325 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:25,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:25,428 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-23 01:57:25,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 440 treesize of output 430 [2021-11-23 01:57:26,039 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,052 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:26,053 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:26,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,101 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:26,102 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 25 treesize of output 25 [2021-11-23 01:57:26,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:26,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:26,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:26,145 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,165 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:26,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:26,213 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,227 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:26,228 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 25 treesize of output 25 [2021-11-23 01:57:26,258 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:26,259 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 15 treesize of output 15 [2021-11-23 01:57:26,296 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,298 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,359 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:26,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:26,448 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,459 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:26,460 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 25 treesize of output 25 [2021-11-23 01:57:26,483 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,493 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:26,494 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 25 treesize of output 25 [2021-11-23 01:57:26,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:26,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:26,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:26,545 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,546 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,559 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:26,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:26,606 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:26,617 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:26,618 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 25 treesize of output 25 [2021-11-23 01:57:26,642 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:26,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1017#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:26,918 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:26,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:26,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-23 01:57:26,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051632984] [2021-11-23 01:57:26,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:26,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 01:57:26,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:26,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 01:57:26,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2021-11-23 01:57:26,921 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 25 states, 25 states have (on average 1.4) internal successors, (35), 24 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:26,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:26,990 INFO L93 Difference]: Finished difference Result 64 states and 83 transitions. [2021-11-23 01:57:26,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 01:57:26,991 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.4) internal successors, (35), 24 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-23 01:57:26,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:26,992 INFO L225 Difference]: With dead ends: 64 [2021-11-23 01:57:26,992 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 01:57:26,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2021-11-23 01:57:26,994 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:26,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:26,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 01:57:27,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-23 01:57:27,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 43 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:27,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-11-23 01:57:27,003 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 30 [2021-11-23 01:57:27,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:27,003 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-11-23 01:57:27,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.4) internal successors, (35), 24 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:27,004 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-11-23 01:57:27,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 01:57:27,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:27,005 INFO L514 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:27,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:27,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 01:57:27,221 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:27,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:27,222 INFO L85 PathProgramCache]: Analyzing trace with hash -893411358, now seen corresponding path program 5 times [2021-11-23 01:57:27,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:27,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656006096] [2021-11-23 01:57:27,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:27,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:27,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:27,724 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 01:57:27,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:27,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656006096] [2021-11-23 01:57:27,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656006096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:27,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262230407] [2021-11-23 01:57:27,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:27,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:27,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:27,731 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:27,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 01:57:27,849 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 01:57:27,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:27,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 01:57:27,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:28,083 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-23 01:57:28,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:28,333 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-23 01:57:28,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262230407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:28,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183280830] [2021-11-23 01:57:28,337 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:28,338 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:28,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:28,339 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:28,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:28,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,472 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:57:28,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:57:28,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,621 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:28,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:28,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-23 01:57:28,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:28,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:28,812 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:28,813 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:28,901 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-23 01:57:28,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 440 treesize of output 430 [2021-11-23 01:57:29,612 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,626 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:29,626 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:29,668 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:29,668 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 15 treesize of output 15 [2021-11-23 01:57:29,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,709 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,789 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:29,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:29,855 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,865 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:29,866 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 25 treesize of output 25 [2021-11-23 01:57:29,889 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,900 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:29,900 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 25 treesize of output 25 [2021-11-23 01:57:29,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:29,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:29,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:29,949 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,950 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:29,966 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:29,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:30,004 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:30,018 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:30,019 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 25 treesize of output 25 [2021-11-23 01:57:30,041 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:30,051 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:30,052 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 25 treesize of output 25 [2021-11-23 01:57:30,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:30,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:30,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:30,103 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:30,104 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:30,118 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:30,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:30,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:30,164 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:30,164 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 25 treesize of output 25 [2021-11-23 01:57:30,186 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:30,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1505#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:30,482 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:30,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:30,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 7, 7] total 35 [2021-11-23 01:57:30,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972954162] [2021-11-23 01:57:30,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:30,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 01:57:30,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:30,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 01:57:30,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=1175, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 01:57:30,485 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 35 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:30,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:30,649 INFO L93 Difference]: Finished difference Result 83 states and 109 transitions. [2021-11-23 01:57:30,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 01:57:30,650 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-23 01:57:30,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:30,651 INFO L225 Difference]: With dead ends: 83 [2021-11-23 01:57:30,651 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 01:57:30,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=385, Invalid=1175, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 01:57:30,654 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:30,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:30,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 01:57:30,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-23 01:57:30,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 62 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:30,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2021-11-23 01:57:30,664 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 42 [2021-11-23 01:57:30,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:30,664 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2021-11-23 01:57:30,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:30,665 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2021-11-23 01:57:30,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 01:57:30,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:30,667 INFO L514 BasicCegarLoop]: trace histogram [23, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:30,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:30,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:30,885 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:30,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:30,886 INFO L85 PathProgramCache]: Analyzing trace with hash 898914522, now seen corresponding path program 6 times [2021-11-23 01:57:30,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:30,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119623403] [2021-11-23 01:57:30,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:30,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:30,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:31,313 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:31,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:31,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119623403] [2021-11-23 01:57:31,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119623403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:31,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323945646] [2021-11-23 01:57:31,314 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:31,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:31,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:31,315 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:31,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 01:57:31,431 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:31,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:31,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 01:57:31,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:31,552 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:31,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:32,325 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:32,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323945646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:32,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1507614174] [2021-11-23 01:57:32,327 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:32,328 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:32,328 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:32,328 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:32,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:32,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,465 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:32,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:32,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 19 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 37 [2021-11-23 01:57:32,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-23 01:57:32,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,664 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,706 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-23 01:57:32,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 460 treesize of output 428 [2021-11-23 01:57:32,788 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,798 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:32,799 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:32,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,833 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:32,834 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 25 treesize of output 25 [2021-11-23 01:57:32,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,879 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:32,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:32,919 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,927 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:32,928 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 25 treesize of output 25 [2021-11-23 01:57:32,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,955 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:32,955 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 25 treesize of output 25 [2021-11-23 01:57:32,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:32,984 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:32,996 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:57:32,997 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 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:57:33,029 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:33,037 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:33,037 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 25 treesize of output 25 [2021-11-23 01:57:33,065 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:33,065 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 15 treesize of output 15 [2021-11-23 01:57:33,100 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:33,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:33,139 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:57:33,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:57:33,185 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:33,194 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:33,195 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 25 treesize of output 25 [2021-11-23 01:57:33,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:33,732 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2199#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:33,732 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:33,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:33,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2021-11-23 01:57:33,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618310940] [2021-11-23 01:57:33,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:33,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 01:57:33,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:33,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 01:57:33,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=1785, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 01:57:33,735 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:33,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:33,876 INFO L93 Difference]: Finished difference Result 126 states and 158 transitions. [2021-11-23 01:57:33,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 01:57:33,877 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 01:57:33,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:33,882 INFO L225 Difference]: With dead ends: 126 [2021-11-23 01:57:33,883 INFO L226 Difference]: Without dead ends: 88 [2021-11-23 01:57:33,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 141 SyntacticMatches, 11 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1295, Invalid=1785, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 01:57:33,886 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:33,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:33,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-23 01:57:33,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-23 01:57:33,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0574712643678161) internal successors, (92), 87 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:33,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-11-23 01:57:33,917 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 61 [2021-11-23 01:57:33,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:33,919 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-11-23 01:57:33,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:33,920 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-11-23 01:57:33,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 01:57:33,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:33,926 INFO L514 BasicCegarLoop]: trace histogram [48, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:33,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:34,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:34,141 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:34,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:34,141 INFO L85 PathProgramCache]: Analyzing trace with hash -114098366, now seen corresponding path program 7 times [2021-11-23 01:57:34,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:34,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395153256] [2021-11-23 01:57:34,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:34,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:34,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:35,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1341 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:35,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:35,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395153256] [2021-11-23 01:57:35,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395153256] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:35,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182972479] [2021-11-23 01:57:35,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 01:57:35,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:35,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:35,385 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:35,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 01:57:35,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:35,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-23 01:57:35,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:35,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1341 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:35,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:38,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1341 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:38,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182972479] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:38,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755844544] [2021-11-23 01:57:38,459 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:38,459 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:38,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:38,460 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:38,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:38,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,573 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:57:38,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:57:38,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,688 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:38,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:38,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-23 01:57:38,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:38,837 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:38,837 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:38,838 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:38,911 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-23 01:57:38,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 440 treesize of output 430 [2021-11-23 01:57:39,498 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,507 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:39,508 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:39,538 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:39,538 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 15 treesize of output 15 [2021-11-23 01:57:39,566 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,566 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,607 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:39,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:39,653 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,661 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:39,662 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 25 treesize of output 25 [2021-11-23 01:57:39,685 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:39,685 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 15 treesize of output 15 [2021-11-23 01:57:39,712 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,713 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,747 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:39,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:39,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,819 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:39,819 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 25 treesize of output 25 [2021-11-23 01:57:39,844 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:39,844 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 15 treesize of output 15 [2021-11-23 01:57:39,873 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,919 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:39,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:39,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:39,980 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:39,980 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 25 treesize of output 25 [2021-11-23 01:57:39,999 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:40,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3229#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:40,318 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:40,318 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:40,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2021-11-23 01:57:40,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995292770] [2021-11-23 01:57:40,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:40,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-23 01:57:40,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:40,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-23 01:57:40,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5070, Invalid=6060, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 01:57:40,332 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 101 states, 101 states have (on average 1.099009900990099) internal successors, (111), 100 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:40,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:40,558 INFO L93 Difference]: Finished difference Result 176 states and 233 transitions. [2021-11-23 01:57:40,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-23 01:57:40,563 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.099009900990099) internal successors, (111), 100 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 01:57:40,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:40,564 INFO L225 Difference]: With dead ends: 176 [2021-11-23 01:57:40,565 INFO L226 Difference]: Without dead ends: 138 [2021-11-23 01:57:40,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5070, Invalid=6060, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 01:57:40,594 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:40,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:40,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-23 01:57:40,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2021-11-23 01:57:40,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0364963503649636) internal successors, (142), 137 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:40,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 142 transitions. [2021-11-23 01:57:40,616 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 142 transitions. Word has length 86 [2021-11-23 01:57:40,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:40,617 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 142 transitions. [2021-11-23 01:57:40,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.099009900990099) internal successors, (111), 100 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:40,618 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 142 transitions. [2021-11-23 01:57:40,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 01:57:40,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:40,628 INFO L514 BasicCegarLoop]: trace histogram [98, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:40,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:40,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:40,847 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:40,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:40,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1787684286, now seen corresponding path program 8 times [2021-11-23 01:57:40,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:40,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625524332] [2021-11-23 01:57:40,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:40,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:41,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 01:57:44,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:44,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625524332] [2021-11-23 01:57:44,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625524332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:44,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252320535] [2021-11-23 01:57:44,538 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:44,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:44,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:44,539 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:44,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 01:57:50,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 01:57:50,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:50,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:57:50,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:50,581 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4961 trivial. 0 not checked. [2021-11-23 01:57:50,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:51,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4961 trivial. 0 not checked. [2021-11-23 01:57:51,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252320535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:51,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269119646] [2021-11-23 01:57:51,265 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:57:51,266 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:51,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:57:51,266 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:57:51,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:57:51,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,390 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:57:51,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:57:51,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,532 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:57:51,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:57:51,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-23 01:57:51,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:51,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:57:51,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:51,796 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-23 01:57:51,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 460 treesize of output 428 [2021-11-23 01:57:51,893 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:51,905 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:57:51,906 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:57:51,939 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:51,940 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 15 treesize of output 15 [2021-11-23 01:57:51,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:51,972 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,014 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:57:52,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:57:52,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,098 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:52,098 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 25 treesize of output 25 [2021-11-23 01:57:52,126 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:52,126 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 15 treesize of output 15 [2021-11-23 01:57:52,160 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,161 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,207 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:57:52,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:57:52,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,261 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:52,262 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 25 treesize of output 25 [2021-11-23 01:57:52,285 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:57:52,286 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 15 treesize of output 15 [2021-11-23 01:57:52,316 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,317 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,377 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:57:52,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:57:52,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:57:52,435 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:57:52,435 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 25 treesize of output 25 [2021-11-23 01:57:52,458 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:57:53,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4781#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:57:53,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:57:53,070 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:53,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 13, 13] total 123 [2021-11-23 01:57:53,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421761539] [2021-11-23 01:57:53,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:53,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-23 01:57:53,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:53,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-23 01:57:53,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5345, Invalid=10911, Unknown=0, NotChecked=0, Total=16256 [2021-11-23 01:57:53,082 INFO L87 Difference]: Start difference. First operand 138 states and 142 transitions. Second operand has 123 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:53,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:53,502 INFO L93 Difference]: Finished difference Result 213 states and 257 transitions. [2021-11-23 01:57:53,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-11-23 01:57:53,503 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 01:57:53,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:53,507 INFO L225 Difference]: With dead ends: 213 [2021-11-23 01:57:53,507 INFO L226 Difference]: Without dead ends: 175 [2021-11-23 01:57:53,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 380 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2801 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5345, Invalid=10911, Unknown=0, NotChecked=0, Total=16256 [2021-11-23 01:57:53,515 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:53,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 01:57:53,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-23 01:57:53,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2021-11-23 01:57:53,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 174 states have (on average 1.028735632183908) internal successors, (179), 174 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:53,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 179 transitions. [2021-11-23 01:57:53,544 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 179 transitions. Word has length 136 [2021-11-23 01:57:53,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:53,545 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 179 transitions. [2021-11-23 01:57:53,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:53,545 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 179 transitions. [2021-11-23 01:57:53,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 01:57:53,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:53,550 INFO L514 BasicCegarLoop]: trace histogram [99, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:53,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:53,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 01:57:53,765 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:53,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:53,765 INFO L85 PathProgramCache]: Analyzing trace with hash -856886374, now seen corresponding path program 9 times [2021-11-23 01:57:53,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:53,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449994077] [2021-11-23 01:57:53,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:53,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:53,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:57,591 INFO L134 CoverageAnalysis]: Checked inductivity of 5709 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 01:57:57,592 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:57,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449994077] [2021-11-23 01:57:57,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449994077] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:57,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596354913] [2021-11-23 01:57:57,593 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:57,593 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:57,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:57,599 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:57,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 01:57:57,830 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:57,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:57,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 1129 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-23 01:57:57,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:58,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5709 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 01:57:58,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:08,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5709 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 01:58:08,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596354913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:08,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667872381] [2021-11-23 01:58:08,191 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:58:08,192 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:58:08,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:58:08,192 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:58:08,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:58:08,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,301 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:58:08,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:58:08,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,448 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:58:08,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:58:08,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-23 01:58:08,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,616 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:58:08,619 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,657 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-23 01:58:08,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 460 treesize of output 428 [2021-11-23 01:58:08,734 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,742 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:58:08,743 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:58:08,775 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:58:08,775 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 15 treesize of output 15 [2021-11-23 01:58:08,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,854 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:58:08,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:58:08,913 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,921 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:58:08,922 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 25 treesize of output 25 [2021-11-23 01:58:08,946 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:58:08,946 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 15 treesize of output 15 [2021-11-23 01:58:08,976 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:08,977 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:09,020 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:58:09,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:58:09,072 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:09,080 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:58:09,082 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 25 treesize of output 25 [2021-11-23 01:58:09,110 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:58:09,110 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 15 treesize of output 15 [2021-11-23 01:58:09,161 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:09,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:09,210 INFO L354 Elim1Store]: treesize reduction 105, result has 28.1 percent of original size [2021-11-23 01:58:09,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 101 [2021-11-23 01:58:09,275 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:58:09,284 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:58:09,285 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 25 treesize of output 25 [2021-11-23 01:58:09,308 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:58:09,775 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6783#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:58:09,775 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:58:09,775 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:58:09,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2021-11-23 01:58:09,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203721914] [2021-11-23 01:58:09,776 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:09,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2021-11-23 01:58:09,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:58:09,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2021-11-23 01:58:09,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20523, Invalid=22533, Unknown=0, NotChecked=0, Total=43056 [2021-11-23 01:58:09,787 INFO L87 Difference]: Start difference. First operand 175 states and 179 transitions. Second operand has 203 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 202 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:58:10,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:58:10,453 INFO L93 Difference]: Finished difference Result 350 states and 458 transitions. [2021-11-23 01:58:10,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-11-23 01:58:10,453 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 202 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 173 [2021-11-23 01:58:10,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:58:10,456 INFO L225 Difference]: With dead ends: 350 [2021-11-23 01:58:10,456 INFO L226 Difference]: Without dead ends: 276 [2021-11-23 01:58:10,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1896 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=20523, Invalid=22533, Unknown=0, NotChecked=0, Total=43056 [2021-11-23 01:58:10,461 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:58:10,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 01:58:10,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-23 01:58:10,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 276. [2021-11-23 01:58:10,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 275 states have (on average 1.018181818181818) internal successors, (280), 275 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:58:10,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 280 transitions. [2021-11-23 01:58:10,478 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 280 transitions. Word has length 173 [2021-11-23 01:58:10,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:58:10,479 INFO L470 AbstractCegarLoop]: Abstraction has 276 states and 280 transitions. [2021-11-23 01:58:10,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 202 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:58:10,480 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 280 transitions. [2021-11-23 01:58:10,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-23 01:58:10,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:58:10,484 INFO L514 BasicCegarLoop]: trace histogram [200, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:58:10,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:10,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:10,713 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:58:10,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:58:10,713 INFO L85 PathProgramCache]: Analyzing trace with hash 738196482, now seen corresponding path program 10 times [2021-11-23 01:58:10,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:58:10,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324604223] [2021-11-23 01:58:10,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:58:10,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:58:11,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:25,393 INFO L134 CoverageAnalysis]: Checked inductivity of 20859 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 01:58:25,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:58:25,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324604223] [2021-11-23 01:58:25,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324604223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:58:25,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054877350] [2021-11-23 01:58:25,394 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 01:58:25,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:25,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:58:25,396 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:58:25,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 01:58:25,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:25,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 1937 conjuncts, 202 conjunts are in the unsatisfiable core [2021-11-23 01:58:25,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:26,338 INFO L134 CoverageAnalysis]: Checked inductivity of 20859 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 01:58:26,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:59:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 20859 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 01:59:06,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054877350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:59:06,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [500910209] [2021-11-23 01:59:06,526 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 01:59:06,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:59:06,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 01:59:06,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 01:59:06,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 01:59:06,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,639 INFO L354 Elim1Store]: treesize reduction 151, result has 18.4 percent of original size [2021-11-23 01:59:06,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 50 [2021-11-23 01:59:06,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,747 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 01:59:06,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 01:59:06,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-23 01:59:06,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:06,872 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:06,873 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:06,873 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:06,953 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-23 01:59:06,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 440 treesize of output 430 [2021-11-23 01:59:07,432 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,441 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 01:59:07,442 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 01:59:07,464 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,472 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:59:07,472 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 25 treesize of output 25 [2021-11-23 01:59:07,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:07,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:07,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:07,496 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,496 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,535 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:59:07,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:59:07,567 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,577 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:59:07,577 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 25 treesize of output 25 [2021-11-23 01:59:07,608 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 01:59:07,609 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 15 treesize of output 15 [2021-11-23 01:59:07,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,640 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,705 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 01:59:07,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 01:59:07,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,768 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:59:07,768 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 25 treesize of output 25 [2021-11-23 01:59:07,784 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,792 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:59:07,793 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 25 treesize of output 25 [2021-11-23 01:59:07,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:07,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:07,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 01:59:07,827 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,828 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,840 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 01:59:07,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 01:59:07,867 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 01:59:07,876 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 01:59:07,876 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 25 treesize of output 25 [2021-11-23 01:59:07,895 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 01:59:08,644 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10069#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 01:59:08,644 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 01:59:08,644 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:59:08,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2021-11-23 01:59:08,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679640964] [2021-11-23 01:59:08,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:59:08,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2021-11-23 01:59:08,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:59:08,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2021-11-23 01:59:08,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81830, Invalid=85860, Unknown=0, NotChecked=0, Total=167690 [2021-11-23 01:59:08,675 INFO L87 Difference]: Start difference. First operand 276 states and 280 transitions. Second operand has 405 states, 405 states have (on average 1.0246913580246915) internal successors, (415), 404 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:59:11,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:59:11,504 INFO L93 Difference]: Finished difference Result 552 states and 761 transitions. [2021-11-23 01:59:11,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2021-11-23 01:59:11,505 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.0246913580246915) internal successors, (415), 404 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 274 [2021-11-23 01:59:11,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:59:11,507 INFO L225 Difference]: With dead ends: 552 [2021-11-23 01:59:11,507 INFO L226 Difference]: Without dead ends: 478 [2021-11-23 01:59:11,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1022 GetRequests, 614 SyntacticMatches, 0 SemanticMatches, 408 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3815 ImplicationChecksByTransitivity, 53.9s TimeCoverageRelationStatistics Valid=81830, Invalid=85860, Unknown=0, NotChecked=0, Total=167690 [2021-11-23 01:59:11,515 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 01:59:11,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 01:59:11,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2021-11-23 01:59:11,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 478. [2021-11-23 01:59:11,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 1.0104821802935011) internal successors, (482), 477 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:59:11,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 482 transitions. [2021-11-23 01:59:11,533 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 482 transitions. Word has length 274 [2021-11-23 01:59:11,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:59:11,533 INFO L470 AbstractCegarLoop]: Abstraction has 478 states and 482 transitions. [2021-11-23 01:59:11,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.0246913580246915) internal successors, (415), 404 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:59:11,534 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 482 transitions. [2021-11-23 01:59:11,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2021-11-23 01:59:11,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:59:11,544 INFO L514 BasicCegarLoop]: trace histogram [402, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:59:11,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 01:59:11,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 01:59:11,765 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:59:11,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:59:11,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1892465410, now seen corresponding path program 11 times [2021-11-23 01:59:11,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:59:11,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367254206] [2021-11-23 01:59:11,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:59:11,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:59:13,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:08,135 INFO L134 CoverageAnalysis]: Checked inductivity of 81762 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2021-11-23 02:00:08,136 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:08,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367254206] [2021-11-23 02:00:08,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367254206] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:00:08,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626071975] [2021-11-23 02:00:08,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:00:08,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:00:08,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:00:08,153 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:00:08,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:06:52,369 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-23 02:06:52,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:06:52,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:06:52,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:56,531 INFO L134 CoverageAnalysis]: Checked inductivity of 81762 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81509 trivial. 0 not checked. [2021-11-23 02:06:56,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:01,113 INFO L134 CoverageAnalysis]: Checked inductivity of 81762 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81509 trivial. 0 not checked. [2021-11-23 02:07:01,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626071975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:01,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [222266948] [2021-11-23 02:07:01,115 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 02:07:01,116 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:07:01,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:07:01,116 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:07:01,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:07:01,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,216 INFO L354 Elim1Store]: treesize reduction 228, result has 14.0 percent of original size [2021-11-23 02:07:01,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 17 case distinctions, treesize of input 75 treesize of output 97 [2021-11-23 02:07:01,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 19 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 37 [2021-11-23 02:07:01,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-23 02:07:01,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,366 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,370 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,397 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-23 02:07:01,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 460 treesize of output 428 [2021-11-23 02:07:01,470 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,480 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-23 02:07:01,481 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-23 02:07:01,506 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,514 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:07:01,514 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 25 treesize of output 25 [2021-11-23 02:07:01,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,540 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,540 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,550 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 02:07:01,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 02:07:01,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,578 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:07:01,578 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 25 treesize of output 25 [2021-11-23 02:07:01,599 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-23 02:07:01,599 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 15 treesize of output 15 [2021-11-23 02:07:01,623 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,624 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,661 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-23 02:07:01,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 111 [2021-11-23 02:07:01,697 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,718 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:07:01,719 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 25 treesize of output 25 [2021-11-23 02:07:01,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,753 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:07:01,753 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 25 treesize of output 25 [2021-11-23 02:07:01,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:07:01,785 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,785 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,798 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-23 02:07:01,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 97 [2021-11-23 02:07:01,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:07:01,839 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-23 02:07:01,839 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 25 treesize of output 25 [2021-11-23 02:07:01,862 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:07:03,305 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15421#(and (<= 0 |ULTIMATE.start_main_~#a4~0#1.base|) (<= 0 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~#a2~0#1.base|) (= |ULTIMATE.start_main_#t~mem11#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) (+ |ULTIMATE.start_main_~#a1~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a4~0#1.base|) (+ |ULTIMATE.start_main_~#a4~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem12#1|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_#t~mem11#1|) 1 0)) (= |#NULL.base| 0))' at error location [2021-11-23 02:07:03,306 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:07:03,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:07:03,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 25, 25] total 451 [2021-11-23 02:07:03,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997800557] [2021-11-23 02:07:03,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:03,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2021-11-23 02:07:03,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:03,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2021-11-23 02:07:03,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82957, Invalid=124523, Unknown=0, NotChecked=0, Total=207480 [2021-11-23 02:07:03,327 INFO L87 Difference]: Start difference. First operand 478 states and 482 transitions. Second operand has 451 states, 451 states have (on average 1.0310421286031042) internal successors, (465), 451 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:06,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:06,903 INFO L93 Difference]: Finished difference Result 625 states and 705 transitions. [2021-11-23 02:07:06,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2021-11-23 02:07:06,904 INFO L78 Accepts]: Start accepts. Automaton has has 451 states, 451 states have (on average 1.0310421286031042) internal successors, (465), 451 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 476 [2021-11-23 02:07:06,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:06,907 INFO L225 Difference]: With dead ends: 625 [2021-11-23 02:07:06,908 INFO L226 Difference]: Without dead ends: 551 [2021-11-23 02:07:06,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1830 GetRequests, 1376 SyntacticMatches, 0 SemanticMatches, 454 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20837 ImplicationChecksByTransitivity, 62.3s TimeCoverageRelationStatistics Valid=82957, Invalid=124523, Unknown=0, NotChecked=0, Total=207480 [2021-11-23 02:07:06,919 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:06,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 52 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 623 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:07:06,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-23 02:07:06,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 551. [2021-11-23 02:07:06,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 551 states, 550 states have (on average 1.009090909090909) internal successors, (555), 550 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:06,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 551 states to 551 states and 555 transitions. [2021-11-23 02:07:06,945 INFO L78 Accepts]: Start accepts. Automaton has 551 states and 555 transitions. Word has length 476 [2021-11-23 02:07:06,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:06,946 INFO L470 AbstractCegarLoop]: Abstraction has 551 states and 555 transitions. [2021-11-23 02:07:06,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 451 states, 451 states have (on average 1.0310421286031042) internal successors, (465), 451 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:06,947 INFO L276 IsEmpty]: Start isEmpty. Operand 551 states and 555 transitions. [2021-11-23 02:07:06,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 550 [2021-11-23 02:07:06,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:06,960 INFO L514 BasicCegarLoop]: trace histogram [403, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:07,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:07,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:07:07,177 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:07,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:07,177 INFO L85 PathProgramCache]: Analyzing trace with hash 1367188762, now seen corresponding path program 12 times [2021-11-23 02:07:07,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:07,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719329036] [2021-11-23 02:07:07,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:07,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:08,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:01,102 INFO L134 CoverageAnalysis]: Checked inductivity of 84649 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 3243 trivial. 0 not checked. [2021-11-23 02:08:01,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:08:01,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719329036] [2021-11-23 02:08:01,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719329036] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:08:01,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268574002] [2021-11-23 02:08:01,103 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:08:01,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:08:01,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:08:01,104 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:08:01,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c4446f1-9507-49a0-aeac-26a8373d2031/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:08:01,763 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:08:01,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:08:01,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 3849 conjuncts, 405 conjunts are in the unsatisfiable core [2021-11-23 02:08:01,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:08:02,947 INFO L134 CoverageAnalysis]: Checked inductivity of 84649 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 3243 trivial. 0 not checked. [2021-11-23 02:08:02,948 INFO L328 TraceCheckSpWp]: Computing backward predicates...