./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS --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 ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-8393723 [2022-11-19 06:44:43,004 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:44:43,008 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:44:43,051 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:44:43,053 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:44:43,059 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:44:43,063 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:44:43,074 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:44:43,076 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:44:43,082 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:44:43,084 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:44:43,086 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:44:43,088 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:44:43,092 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:44:43,094 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:44:43,096 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:44:43,099 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:44:43,105 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:44:43,107 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:44:43,110 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:44:43,117 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:44:43,119 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:44:43,121 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:44:43,124 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:44:43,129 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:44:43,134 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:44:43,134 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:44:43,136 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:44:43,137 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:44:43,139 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:44:43,139 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:44:43,141 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:44:43,143 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:44:43,145 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:44:43,147 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:44:43,148 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:44:43,148 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:44:43,149 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:44:43,149 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:44:43,150 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:44:43,151 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:44:43,152 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:44:43,208 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:44:43,210 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:44:43,211 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:44:43,211 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:44:43,212 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:44:43,213 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:44:43,213 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:44:43,214 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:44:43,214 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:44:43,215 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:44:43,216 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:44:43,216 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:44:43,217 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:44:43,217 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:44:43,217 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:44:43,218 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:44:43,218 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:44:43,218 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:44:43,219 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:44:43,220 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:44:43,221 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:44:43,226 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:44:43,227 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:44:43,228 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:44:43,229 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:44:43,229 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:44:43,229 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:44:43,230 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:44:43,230 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:44:43,230 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:44:43,231 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:44:43,231 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:44:43,231 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:44:43,232 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:44:43,232 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:44:43,232 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:44:43,233 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:44:43,233 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:44:43,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:44:43,234 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:44:43,234 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:44:43,234 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e [2022-11-19 06:44:43,556 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:44:43,583 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:44:43,586 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:44:43,588 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:44:43,589 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:44:43,591 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-11-19 06:44:43,665 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/data/5f2ad5c42/58bd1aea56d248f791edd559f6873b2d/FLAG8a3fd519a [2022-11-19 06:44:44,232 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:44:44,233 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2022-11-19 06:44:44,242 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/data/5f2ad5c42/58bd1aea56d248f791edd559f6873b2d/FLAG8a3fd519a [2022-11-19 06:44:44,615 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/data/5f2ad5c42/58bd1aea56d248f791edd559f6873b2d [2022-11-19 06:44:44,620 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:44:44,622 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:44:44,635 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:44:44,635 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:44:44,642 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:44:44,643 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:44,645 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22f077dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44, skipping insertion in model container [2022-11-19 06:44:44,646 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:44,655 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:44:44,678 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:44:44,861 WARN L234 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_cc22cd51-e907-434a-9d08-b5b35e4cc737/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-11-19 06:44:44,911 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:44:44,925 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:44:44,938 WARN L234 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_cc22cd51-e907-434a-9d08-b5b35e4cc737/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2022-11-19 06:44:44,949 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:44:44,966 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:44:44,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44 WrapperNode [2022-11-19 06:44:44,967 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:44:44,968 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:44:44,969 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:44:44,969 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:44:44,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,009 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,047 INFO L138 Inliner]: procedures = 16, calls = 27, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2022-11-19 06:44:45,050 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:44:45,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:44:45,052 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:44:45,052 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:44:45,066 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,070 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,077 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,083 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,084 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,086 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,088 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:44:45,089 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:44:45,090 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:44:45,090 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:44:45,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (1/1) ... [2022-11-19 06:44:45,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:44:45,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:45,140 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:44:45,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:44:45,199 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:44:45,200 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:44:45,200 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-19 06:44:45,200 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-19 06:44:45,200 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:44:45,201 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:44:45,201 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-19 06:44:45,201 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 06:44:45,202 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 06:44:45,202 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-19 06:44:45,314 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:44:45,318 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:44:45,550 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:44:45,609 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:44:45,609 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-19 06:44:45,612 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:44:45 BoogieIcfgContainer [2022-11-19 06:44:45,613 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:44:45,616 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:44:45,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:44:45,630 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:44:45,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:44:44" (1/3) ... [2022-11-19 06:44:45,639 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a6e7edc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:44:45, skipping insertion in model container [2022-11-19 06:44:45,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:44:44" (2/3) ... [2022-11-19 06:44:45,640 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a6e7edc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:44:45, skipping insertion in model container [2022-11-19 06:44:45,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:44:45" (3/3) ... [2022-11-19 06:44:45,642 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_compareModified_ground.i [2022-11-19 06:44:45,666 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:44:45,666 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:44:45,729 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:44:45,739 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@a666f5a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:44:45,739 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:44:45,745 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:45,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 06:44:45,756 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:45,757 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:45,758 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:45,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:45,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1259005784, now seen corresponding path program 1 times [2022-11-19 06:44:45,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:45,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427936040] [2022-11-19 06:44:45,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:45,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:45,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:46,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:44:46,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:46,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427936040] [2022-11-19 06:44:46,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427936040] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:44:46,139 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:44:46,139 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 06:44:46,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932692142] [2022-11-19 06:44:46,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:44:46,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:44:46,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:46,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:44:46,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 06:44:46,213 INFO L87 Difference]: Start difference. First operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:46,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:46,367 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2022-11-19 06:44:46,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:44:46,370 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 06:44:46,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:46,380 INFO L225 Difference]: With dead ends: 35 [2022-11-19 06:44:46,380 INFO L226 Difference]: Without dead ends: 18 [2022-11-19 06:44:46,404 INFO L412 NwaCegarLoop]: 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 [2022-11-19 06:44:46,409 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:44:46,410 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:44:46,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-19 06:44:46,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-11-19 06:44:46,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:46,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2022-11-19 06:44:46,456 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 9 [2022-11-19 06:44:46,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:46,457 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2022-11-19 06:44:46,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:46,457 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2022-11-19 06:44:46,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 06:44:46,459 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:46,459 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:46,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 06:44:46,460 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:46,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:46,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1981076570, now seen corresponding path program 1 times [2022-11-19 06:44:46,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:46,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605829082] [2022-11-19 06:44:46,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:46,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:46,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:46,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:44:46,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:46,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605829082] [2022-11-19 06:44:46,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605829082] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:44:46,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150712811] [2022-11-19 06:44:46,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:46,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:46,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:46,596 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:46,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:44:46,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:46,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 06:44:46,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:46,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:44:46,799 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:44:46,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150712811] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:44:46,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 06:44:46,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-11-19 06:44:46,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786673302] [2022-11-19 06:44:46,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:44:46,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:44:46,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:46,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:44:46,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:44:46,816 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:46,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:46,869 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2022-11-19 06:44:46,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:44:46,871 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-19 06:44:46,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:46,873 INFO L225 Difference]: With dead ends: 33 [2022-11-19 06:44:46,875 INFO L226 Difference]: Without dead ends: 19 [2022-11-19 06:44:46,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:44:46,878 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:44:46,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:44:46,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-19 06:44:46,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-19 06:44:46,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:46,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2022-11-19 06:44:46,896 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2022-11-19 06:44:46,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:46,897 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2022-11-19 06:44:46,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:46,897 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2022-11-19 06:44:46,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-19 06:44:46,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:46,899 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:46,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:44:47,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:47,107 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:47,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:47,108 INFO L85 PathProgramCache]: Analyzing trace with hash 252948675, now seen corresponding path program 1 times [2022-11-19 06:44:47,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:47,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101319355] [2022-11-19 06:44:47,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:47,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:47,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:47,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:44:47,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:47,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101319355] [2022-11-19 06:44:47,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101319355] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:44:47,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065700215] [2022-11-19 06:44:47,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:47,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:47,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:47,277 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:47,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:44:47,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:47,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 06:44:47,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:47,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:44:47,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:44:47,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:44:47,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065700215] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:44:47,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2095025906] [2022-11-19 06:44:47,528 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:44:47,528 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:44:47,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:44:47,540 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:44:47,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:44:47,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:47,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:47,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:47,843 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:44:47,846 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:44:47,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:47,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:47,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:47,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-19 06:44:48,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:48,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:48,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-19 06:44:48,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:48,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:48,372 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:48,373 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:48,375 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:48,504 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-19 06:44:48,505 INFO L350 Elim1Store]: Elim1 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 360 treesize of output 350 [2022-11-19 06:44:49,297 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:49,316 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:44:49,317 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:44:49,419 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:44:49,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:44:49,510 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:49,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:49,556 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:49,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:49,706 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:49,707 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:49,754 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:49,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:49,811 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:44:49,841 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:44:50,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '273#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:44:50,265 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:44:50,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:44:50,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-19 06:44:50,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626027531] [2022-11-19 06:44:50,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:44:50,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 06:44:50,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:50,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 06:44:50,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-11-19 06:44:50,268 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:50,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:50,338 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-19 06:44:50,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 06:44:50,339 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-19 06:44:50,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:50,342 INFO L225 Difference]: With dead ends: 38 [2022-11-19 06:44:50,342 INFO L226 Difference]: Without dead ends: 22 [2022-11-19 06:44:50,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-11-19 06:44:50,355 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:44:50,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:44:50,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-19 06:44:50,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-19 06:44:50,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:50,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-11-19 06:44:50,361 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 11 [2022-11-19 06:44:50,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:50,362 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-11-19 06:44:50,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:50,362 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-11-19 06:44:50,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:44:50,363 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:50,363 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:50,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:44:50,565 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:50,568 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:50,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:50,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1580081915, now seen corresponding path program 2 times [2022-11-19 06:44:50,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:50,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120994055] [2022-11-19 06:44:50,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:50,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:50,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:50,687 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:50,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:50,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120994055] [2022-11-19 06:44:50,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120994055] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:44:50,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890342469] [2022-11-19 06:44:50,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:44:50,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:50,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:50,691 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:50,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:44:50,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 06:44:50,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:44:50,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 06:44:50,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:50,833 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:50,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:44:50,861 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:50,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890342469] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:44:50,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [922309790] [2022-11-19 06:44:50,865 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:44:50,865 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:44:50,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:44:50,866 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:44:50,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:44:50,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:50,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:50,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:50,997 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:44:50,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:44:51,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-19 06:44:51,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-19 06:44:51,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:51,259 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:51,261 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:51,262 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:51,360 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-19 06:44:51,361 INFO L350 Elim1Store]: Elim1 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 360 treesize of output 350 [2022-11-19 06:44:51,878 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:51,894 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:44:51,894 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:44:51,962 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:44:51,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:44:52,022 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:52,023 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:52,075 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:52,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:52,132 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:44:52,160 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:44:52,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '457#(and (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (= (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_2|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:44:52,554 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:44:52,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:44:52,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-19 06:44:52,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257751237] [2022-11-19 06:44:52,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:44:52,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 06:44:52,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:52,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 06:44:52,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-11-19 06:44:52,557 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:52,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:52,608 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-11-19 06:44:52,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 06:44:52,609 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-19 06:44:52,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:52,610 INFO L225 Difference]: With dead ends: 39 [2022-11-19 06:44:52,610 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 06:44:52,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-11-19 06:44:52,612 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 28 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 [2022-11-19 06:44:52,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 28 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:44:52,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 06:44:52,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 06:44:52,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:52,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-19 06:44:52,627 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 14 [2022-11-19 06:44:52,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:52,627 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-19 06:44:52,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:52,628 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-19 06:44:52,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-19 06:44:52,630 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:52,630 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:52,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 06:44:52,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:52,837 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:52,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:52,838 INFO L85 PathProgramCache]: Analyzing trace with hash -843220200, now seen corresponding path program 3 times [2022-11-19 06:44:52,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:52,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568337376] [2022-11-19 06:44:52,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:52,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:52,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:53,123 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:53,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:53,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568337376] [2022-11-19 06:44:53,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568337376] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:44:53,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622069539] [2022-11-19 06:44:53,124 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:44:53,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:53,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:53,127 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:53,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:44:53,228 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:44:53,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:44:53,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 06:44:53,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:53,251 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:53,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:44:53,317 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:53,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622069539] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:44:53,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936719119] [2022-11-19 06:44:53,320 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:44:53,320 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:44:53,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:44:53,321 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:44:53,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:44:53,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,431 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:44:53,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:44:53,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-19 06:44:53,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-19 06:44:53,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,627 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:53,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:53,633 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:53,677 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-19 06:44:53,677 INFO L350 Elim1Store]: Elim1 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 380 treesize of output 348 [2022-11-19 06:44:53,791 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:53,805 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:44:53,805 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:44:53,866 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:44:53,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:44:53,917 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:53,918 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:53,957 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:53,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:54,010 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:44:54,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:44:54,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '673#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_3|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:44:54,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:44:54,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:44:54,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-19 06:44:54,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505929585] [2022-11-19 06:44:54,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:44:54,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 06:44:54,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:54,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 06:44:54,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:44:54,414 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:54,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:54,488 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-11-19 06:44:54,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 06:44:54,489 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-19 06:44:54,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:54,490 INFO L225 Difference]: With dead ends: 50 [2022-11-19 06:44:54,491 INFO L226 Difference]: Without dead ends: 31 [2022-11-19 06:44:54,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:44:54,494 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:44:54,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:44:54,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-19 06:44:54,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-19 06:44:54,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:54,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2022-11-19 06:44:54,508 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 17 [2022-11-19 06:44:54,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:54,508 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2022-11-19 06:44:54,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:54,509 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2022-11-19 06:44:54,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-19 06:44:54,511 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:54,511 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:54,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:44:54,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:54,718 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:54,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:54,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1290300376, now seen corresponding path program 4 times [2022-11-19 06:44:54,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:54,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659541852] [2022-11-19 06:44:54,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:54,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:54,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:55,058 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:55,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:55,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659541852] [2022-11-19 06:44:55,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659541852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:44:55,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90515479] [2022-11-19 06:44:55,059 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:44:55,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:55,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:55,061 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:55,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:44:55,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:55,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 06:44:55,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:55,255 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:55,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:44:55,501 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:55,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90515479] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:44:55,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825496920] [2022-11-19 06:44:55,504 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:44:55,504 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:44:55,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:44:55,504 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:44:55,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:44:55,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,596 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:44:55,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:44:55,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,689 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:44:55,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:44:55,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-19 06:44:55,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:55,869 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:55,870 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:55,871 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:55,956 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-19 06:44:55,956 INFO L350 Elim1Store]: Elim1 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 360 treesize of output 350 [2022-11-19 06:44:56,427 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:56,440 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:44:56,440 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:44:56,501 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:44:56,501 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:44:56,557 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:56,558 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:56,593 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:56,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:56,641 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:44:56,683 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:44:57,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '971#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_4|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:44:57,076 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:44:57,077 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:44:57,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-19 06:44:57,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322233676] [2022-11-19 06:44:57,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:44:57,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 06:44:57,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:57,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 06:44:57,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 06:44:57,079 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:57,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:44:57,165 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2022-11-19 06:44:57,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 06:44:57,166 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-19 06:44:57,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:44:57,167 INFO L225 Difference]: With dead ends: 62 [2022-11-19 06:44:57,167 INFO L226 Difference]: Without dead ends: 43 [2022-11-19 06:44:57,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 06:44:57,169 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:44:57,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:44:57,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-19 06:44:57,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-19 06:44:57,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:44:57,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2022-11-19 06:44:57,176 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 23 [2022-11-19 06:44:57,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:44:57,177 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2022-11-19 06:44:57,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:44:57,177 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2022-11-19 06:44:57,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-19 06:44:57,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:44:57,178 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:44:57,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:44:57,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 06:44:57,385 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:44:57,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:44:57,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1856791208, now seen corresponding path program 5 times [2022-11-19 06:44:57,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:44:57,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049395764] [2022-11-19 06:44:57,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:44:57,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:44:57,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:44:58,252 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:44:58,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:44:58,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049395764] [2022-11-19 06:44:58,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049395764] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:44:58,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125621059] [2022-11-19 06:44:58,253 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:44:58,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:44:58,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:44:58,254 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:44:58,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:44:58,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 06:44:58,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:44:58,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 06:44:58,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:44:58,546 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:44:58,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:44:58,713 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:44:58,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125621059] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:44:58,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608299660] [2022-11-19 06:44:58,716 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:44:58,716 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:44:58,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:44:58,717 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:44:58,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:44:58,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,826 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:44:58,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:44:58,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-19 06:44:58,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-19 06:44:58,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,992 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:58,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:44:58,997 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:59,032 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-19 06:44:59,033 INFO L350 Elim1Store]: Elim1 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 380 treesize of output 348 [2022-11-19 06:44:59,126 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:59,137 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:44:59,138 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:44:59,160 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:59,161 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:59,194 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:59,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:59,255 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:59,256 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:44:59,286 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:44:59,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:44:59,331 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:44:59,350 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:44:59,803 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1399#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_5|) 0)) 1 0)))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:44:59,803 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:44:59,803 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:44:59,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2022-11-19 06:44:59,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391334713] [2022-11-19 06:44:59,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:44:59,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-19 06:44:59,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:44:59,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-19 06:44:59,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=1406, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 06:44:59,806 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:00,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:00,405 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2022-11-19 06:45:00,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-19 06:45:00,405 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-11-19 06:45:00,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:00,406 INFO L225 Difference]: With dead ends: 69 [2022-11-19 06:45:00,406 INFO L226 Difference]: Without dead ends: 50 [2022-11-19 06:45:00,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1205, Invalid=3085, Unknown=0, NotChecked=0, Total=4290 [2022-11-19 06:45:00,409 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 100 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:00,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 126 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:45:00,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-19 06:45:00,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-19 06:45:00,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:45:00,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-11-19 06:45:00,424 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 35 [2022-11-19 06:45:00,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:00,424 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-11-19 06:45:00,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:00,425 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-11-19 06:45:00,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-19 06:45:00,430 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:00,430 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:00,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:00,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:00,637 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:00,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:00,637 INFO L85 PathProgramCache]: Analyzing trace with hash -1217782982, now seen corresponding path program 6 times [2022-11-19 06:45:00,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:00,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209904355] [2022-11-19 06:45:00,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:00,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:00,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:45:01,651 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:01,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:45:01,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209904355] [2022-11-19 06:45:01,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209904355] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:01,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078230654] [2022-11-19 06:45:01,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:45:01,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:01,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:45:01,656 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:45:01,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:45:01,861 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:45:01,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:45:01,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-19 06:45:01,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:45:01,931 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:01,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:45:02,766 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:02,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078230654] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:45:02,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1050866158] [2022-11-19 06:45:02,769 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:45:02,769 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:45:02,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:45:02,769 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:45:02,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:45:02,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,844 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:45:02,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:45:02,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,941 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:45:02,941 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:45:02,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:02,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-19 06:45:03,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:03,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:03,113 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:03,114 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:03,115 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:03,186 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-19 06:45:03,187 INFO L350 Elim1Store]: Elim1 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 360 treesize of output 350 [2022-11-19 06:45:03,542 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:03,554 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:45:03,554 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:45:03,602 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:45:03,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:45:03,647 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:03,648 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:03,677 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:03,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:03,723 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:45:03,740 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:45:04,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1959#(and (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_6|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:45:04,153 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:45:04,153 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:45:04,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2022-11-19 06:45:04,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372053134] [2022-11-19 06:45:04,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:45:04,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-19 06:45:04,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:45:04,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-19 06:45:04,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 06:45:04,157 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:04,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:04,313 INFO L93 Difference]: Finished difference Result 100 states and 134 transitions. [2022-11-19 06:45:04,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-19 06:45:04,314 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-19 06:45:04,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:04,317 INFO L225 Difference]: With dead ends: 100 [2022-11-19 06:45:04,318 INFO L226 Difference]: Without dead ends: 75 [2022-11-19 06:45:04,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 06:45:04,320 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:04,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:45:04,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-19 06:45:04,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-11-19 06:45:04,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 71 states have internal predecessors, (76), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:45:04,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2022-11-19 06:45:04,340 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 42 [2022-11-19 06:45:04,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:04,340 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2022-11-19 06:45:04,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:04,341 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2022-11-19 06:45:04,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-19 06:45:04,342 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:04,342 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:04,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:04,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:04,546 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:04,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:04,546 INFO L85 PathProgramCache]: Analyzing trace with hash 939129208, now seen corresponding path program 7 times [2022-11-19 06:45:04,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:04,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900209681] [2022-11-19 06:45:04,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:04,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:04,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:45:07,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:07,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:45:07,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900209681] [2022-11-19 06:45:07,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900209681] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:07,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645663335] [2022-11-19 06:45:07,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:45:07,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:07,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:45:07,010 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:45:07,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:45:07,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:45:07,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 980 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 06:45:07,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:45:07,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:07,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:45:10,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:10,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645663335] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:45:10,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631374411] [2022-11-19 06:45:10,644 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:45:10,645 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:45:10,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:45:10,645 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:45:10,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:45:10,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,719 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:45:10,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:45:10,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,806 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:45:10,806 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:45:10,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,846 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-19 06:45:10,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:10,947 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:10,948 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:10,949 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:11,018 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-19 06:45:11,020 INFO L350 Elim1Store]: Elim1 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 360 treesize of output 350 [2022-11-19 06:45:11,348 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:11,360 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:45:11,361 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:45:11,387 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:11,388 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:11,416 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:11,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:11,456 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:11,457 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:11,488 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:11,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:11,536 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:45:11,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:45:12,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2785#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:45:12,111 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:45:12,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:45:12,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-11-19 06:45:12,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020561258] [2022-11-19 06:45:12,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:45:12,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-19 06:45:12,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:45:12,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-19 06:45:12,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 06:45:12,118 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:12,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:12,394 INFO L93 Difference]: Finished difference Result 150 states and 209 transitions. [2022-11-19 06:45:12,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-19 06:45:12,395 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-11-19 06:45:12,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:12,399 INFO L225 Difference]: With dead ends: 150 [2022-11-19 06:45:12,399 INFO L226 Difference]: Without dead ends: 125 [2022-11-19 06:45:12,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 06:45:12,405 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:12,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 98 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:45:12,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-19 06:45:12,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2022-11-19 06:45:12,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.0413223140495869) internal successors, (126), 121 states have internal predecessors, (126), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:45:12,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2022-11-19 06:45:12,435 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 67 [2022-11-19 06:45:12,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:12,436 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2022-11-19 06:45:12,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:12,436 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2022-11-19 06:45:12,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-19 06:45:12,445 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:12,445 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:12,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:12,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:12,646 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:12,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:12,647 INFO L85 PathProgramCache]: Analyzing trace with hash 760188856, now seen corresponding path program 8 times [2022-11-19 06:45:12,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:12,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745981207] [2022-11-19 06:45:12,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:12,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:12,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:45:21,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-19 06:45:21,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:45:21,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745981207] [2022-11-19 06:45:21,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745981207] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:21,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228840165] [2022-11-19 06:45:21,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:45:21,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:21,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:45:21,384 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:45:21,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 06:45:22,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 06:45:22,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:45:22,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 06:45:22,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:45:23,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-19 06:45:23,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:45:24,340 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-19 06:45:24,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228840165] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:45:24,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755539942] [2022-11-19 06:45:24,348 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:45:24,348 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:45:24,348 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:45:24,348 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:45:24,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:45:24,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,425 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:45:24,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:45:24,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,518 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:45:24,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:45:24,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-19 06:45:24,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,656 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:24,660 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,696 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-19 06:45:24,697 INFO L350 Elim1Store]: Elim1 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 380 treesize of output 348 [2022-11-19 06:45:24,786 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,798 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:45:24,798 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:45:24,819 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,821 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,855 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:24,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:24,897 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,898 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:24,928 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:24,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:25,012 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:25,013 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:25,043 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:25,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:25,081 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:45:25,095 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:45:25,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4133#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_8|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:45:25,990 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:45:25,990 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:45:25,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 12, 12] total 122 [2022-11-19 06:45:25,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041500492] [2022-11-19 06:45:25,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:45:25,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-19 06:45:25,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:45:25,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-19 06:45:25,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5372, Invalid=11658, Unknown=0, NotChecked=0, Total=17030 [2022-11-19 06:45:25,997 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:31,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:31,380 INFO L93 Difference]: Finished difference Result 163 states and 185 transitions. [2022-11-19 06:45:31,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-11-19 06:45:31,381 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2022-11-19 06:45:31,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:31,382 INFO L225 Difference]: With dead ends: 163 [2022-11-19 06:45:31,382 INFO L226 Difference]: Without dead ends: 138 [2022-11-19 06:45:31,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8458 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=17549, Invalid=35121, Unknown=0, NotChecked=0, Total=52670 [2022-11-19 06:45:31,391 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 404 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:31,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [404 Valid, 182 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:45:31,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-19 06:45:31,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-11-19 06:45:31,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 134 states have (on average 1.037313432835821) internal successors, (139), 134 states have internal predecessors, (139), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:45:31,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2022-11-19 06:45:31,409 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 117 [2022-11-19 06:45:31,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:31,409 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2022-11-19 06:45:31,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:31,410 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2022-11-19 06:45:31,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-19 06:45:31,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:31,412 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:31,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:31,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 06:45:31,621 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:31,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:31,622 INFO L85 PathProgramCache]: Analyzing trace with hash -997656454, now seen corresponding path program 9 times [2022-11-19 06:45:31,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:31,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036659690] [2022-11-19 06:45:31,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:31,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:45:39,669 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:45:39,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:45:39,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036659690] [2022-11-19 06:45:39,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036659690] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:39,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275360315] [2022-11-19 06:45:39,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:45:39,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:39,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:45:39,671 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:45:39,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 06:45:40,327 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:45:40,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:45:40,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 1943 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-19 06:45:40,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:45:40,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:45:40,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:45:53,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:45:53,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275360315] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:45:53,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1286453316] [2022-11-19 06:45:53,120 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:45:53,120 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:45:53,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:45:53,121 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:45:53,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:45:53,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,185 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:45:53,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:45:53,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,265 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:45:53,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:45:53,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-19 06:45:53,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,390 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,393 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:45:53,430 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-19 06:45:53,431 INFO L350 Elim1Store]: Elim1 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 380 treesize of output 348 [2022-11-19 06:45:53,518 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,531 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:45:53,532 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:45:53,554 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,555 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,622 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:53,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:53,676 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,677 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,709 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:53,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:53,795 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,796 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:45:53,828 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:45:53,828 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:45:53,857 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:45:53,871 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:45:54,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5889#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (= (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_9|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |#NULL.base| 0))' at error location [2022-11-19 06:45:54,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:45:54,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:45:54,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2022-11-19 06:45:54,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600585769] [2022-11-19 06:45:54,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:45:54,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2022-11-19 06:45:54,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:45:54,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2022-11-19 06:45:54,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-11-19 06:45:54,709 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:55,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:55,404 INFO L93 Difference]: Finished difference Result 276 states and 386 transitions. [2022-11-19 06:45:55,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2022-11-19 06:45:55,405 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2022-11-19 06:45:55,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:55,407 INFO L225 Difference]: With dead ends: 276 [2022-11-19 06:45:55,407 INFO L226 Difference]: Without dead ends: 239 [2022-11-19 06:45:55,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2802 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2022-11-19 06:45:55,410 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:55,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 06:45:55,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-11-19 06:45:55,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2022-11-19 06:45:55,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 235 states have (on average 1.0212765957446808) internal successors, (240), 235 states have internal predecessors, (240), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:45:55,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 244 transitions. [2022-11-19 06:45:55,432 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 244 transitions. Word has length 130 [2022-11-19 06:45:55,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:55,432 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 244 transitions. [2022-11-19 06:45:55,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:45:55,433 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 244 transitions. [2022-11-19 06:45:55,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2022-11-19 06:45:55,436 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:55,436 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:55,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:55,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:55,645 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:55,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:55,646 INFO L85 PathProgramCache]: Analyzing trace with hash -113899976, now seen corresponding path program 10 times [2022-11-19 06:45:55,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:55,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314770643] [2022-11-19 06:45:55,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:55,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:56,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:46:24,253 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:46:24,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:46:24,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314770643] [2022-11-19 06:46:24,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314770643] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:46:24,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502163160] [2022-11-19 06:46:24,254 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:46:24,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:46:24,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:46:24,255 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:46:24,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 06:46:25,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:46:25,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 3660 conjuncts, 202 conjunts are in the unsatisfiable core [2022-11-19 06:46:25,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:46:25,851 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:46:25,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:47:15,258 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:47:15,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1502163160] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:47:15,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141324768] [2022-11-19 06:47:15,260 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:47:15,260 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:47:15,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:47:15,260 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:47:15,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:47:15,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,341 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:47:15,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:47:15,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-19 06:47:15,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-19 06:47:15,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,475 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:47:15,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:47:15,482 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:47:15,518 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-19 06:47:15,519 INFO L350 Elim1Store]: Elim1 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 380 treesize of output 348 [2022-11-19 06:47:15,593 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:47:15,605 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:47:15,606 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:47:15,653 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:47:15,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:47:15,707 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:47:15,708 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:47:15,741 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:47:15,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:47:15,772 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:47:15,785 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:47:17,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8683#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_10|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) 0)) 1 0)))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:47:17,329 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:47:17,329 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:47:17,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2022-11-19 06:47:17,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488711012] [2022-11-19 06:47:17,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:47:17,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2022-11-19 06:47:17,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:47:17,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2022-11-19 06:47:17,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-11-19 06:47:17,355 INFO L87 Difference]: Start difference. First operand 239 states and 244 transitions. Second operand has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:47:20,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:47:20,193 INFO L93 Difference]: Finished difference Result 478 states and 689 transitions. [2022-11-19 06:47:20,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2022-11-19 06:47:20,195 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 231 [2022-11-19 06:47:20,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:47:20,197 INFO L225 Difference]: With dead ends: 478 [2022-11-19 06:47:20,198 INFO L226 Difference]: Without dead ends: 441 [2022-11-19 06:47:20,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 411 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5630 ImplicationChecksByTransitivity, 66.5s TimeCoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2022-11-19 06:47:20,219 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:47:20,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:47:20,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-11-19 06:47:20,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2022-11-19 06:47:20,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 437 states have (on average 1.011441647597254) internal successors, (442), 437 states have internal predecessors, (442), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:47:20,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 446 transitions. [2022-11-19 06:47:20,253 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 446 transitions. Word has length 231 [2022-11-19 06:47:20,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:47:20,254 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 446 transitions. [2022-11-19 06:47:20,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:47:20,255 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 446 transitions. [2022-11-19 06:47:20,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2022-11-19 06:47:20,263 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:47:20,264 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:47:20,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 06:47:20,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:47:20,477 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:47:20,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:47:20,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1510019208, now seen corresponding path program 11 times [2022-11-19 06:47:20,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:47:20,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759597967] [2022-11-19 06:47:20,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:47:20,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:47:22,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:21,117 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 06:49:21,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:21,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759597967] [2022-11-19 06:49:21,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759597967] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:21,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587148152] [2022-11-19 06:49:21,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:49:21,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:21,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:21,126 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:21,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 06:50:15,916 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 06:50:15,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:50:15,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 06:50:15,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:50:20,697 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-11-19 06:50:20,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:50:25,924 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2022-11-19 06:50:25,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587148152] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:50:25,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2046574790] [2022-11-19 06:50:25,927 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:50:25,927 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:50:25,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:50:25,928 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:50:25,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:50:25,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:25,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:25,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:25,995 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:50:25,996 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:50:26,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,085 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:50:26,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:50:26,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-11-19 06:50:26,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,286 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,289 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:50:26,326 INFO L321 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-11-19 06:50:26,327 INFO L350 Elim1Store]: Elim1 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 380 treesize of output 348 [2022-11-19 06:50:26,410 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,421 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:50:26,421 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:50:26,441 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,442 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,470 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:50:26,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:50:26,519 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,520 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:50:26,552 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:50:26,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:50:26,584 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:50:26,601 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:50:29,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13543#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11|) (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_11|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_11|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:50:29,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:50:29,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:50:29,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 24, 24] total 450 [2022-11-19 06:50:29,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26084731] [2022-11-19 06:50:29,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:50:29,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2022-11-19 06:50:29,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:50:29,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2022-11-19 06:50:29,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83008, Invalid=127214, Unknown=0, NotChecked=0, Total=210222 [2022-11-19 06:50:29,585 INFO L87 Difference]: Start difference. First operand 441 states and 446 transitions. Second operand has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:51:58,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:51:58,034 INFO L93 Difference]: Finished difference Result 503 states and 537 transitions. [2022-11-19 06:51:58,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2022-11-19 06:51:58,035 INFO L78 Accepts]: Start accepts. Automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 433 [2022-11-19 06:51:58,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:51:58,037 INFO L225 Difference]: With dead ends: 503 [2022-11-19 06:51:58,038 INFO L226 Difference]: Without dead ends: 466 [2022-11-19 06:51:58,082 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2104 GetRequests, 1244 SyntacticMatches, 0 SemanticMatches, 860 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104894 ImplicationChecksByTransitivity, 152.6s TimeCoverageRelationStatistics Valid=264761, Invalid=477421, Unknown=0, NotChecked=0, Total=742182 [2022-11-19 06:51:58,083 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 2025 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2025 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:51:58,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2025 Valid, 140 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 06:51:58,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-11-19 06:51:58,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 466. [2022-11-19 06:51:58,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 462 states have (on average 1.0108225108225108) internal successors, (467), 462 states have internal predecessors, (467), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:51:58,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 471 transitions. [2022-11-19 06:51:58,115 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 471 transitions. Word has length 433 [2022-11-19 06:51:58,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:51:58,116 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 471 transitions. [2022-11-19 06:51:58,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:51:58,117 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 471 transitions. [2022-11-19 06:51:58,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2022-11-19 06:51:58,128 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:51:58,129 INFO L195 NwaCegarLoop]: trace histogram [403, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:51:58,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 06:51:58,351 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 06:51:58,351 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:51:58,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:51:58,352 INFO L85 PathProgramCache]: Analyzing trace with hash 497319930, now seen corresponding path program 12 times [2022-11-19 06:51:58,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:51:58,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022410625] [2022-11-19 06:51:58,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:51:58,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:00,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:53:57,636 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-19 06:53:57,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:53:57,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022410625] [2022-11-19 06:53:57,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022410625] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:53:57,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77077346] [2022-11-19 06:53:57,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:53:57,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:53:57,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:53:57,638 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:53:57,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 06:53:59,979 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:53:59,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:54:00,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 7303 conjuncts, 405 conjunts are in the unsatisfiable core [2022-11-19 06:54:00,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:54:00,779 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-19 06:54:00,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:57:20,449 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-11-19 06:57:20,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77077346] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:57:20,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [340640465] [2022-11-19 06:57:20,451 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:57:20,451 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:57:20,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:57:20,452 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:57:20,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:57:20,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,516 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-19 06:57:20,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-19 06:57:20,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,596 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-19 06:57:20,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-19 06:57:20,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,627 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-11-19 06:57:20,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:57:20,830 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:20,831 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:20,831 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:20,894 INFO L321 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-11-19 06:57:20,895 INFO L350 Elim1Store]: Elim1 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 360 treesize of output 350 [2022-11-19 06:57:21,179 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:21,190 INFO L321 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-11-19 06:57:21,191 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 29 [2022-11-19 06:57:21,239 INFO L321 Elim1Store]: treesize reduction 28, result has 49.1 percent of original size [2022-11-19 06:57:21,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 50 [2022-11-19 06:57:21,277 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:21,278 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:21,306 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:57:21,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:57:21,370 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:21,371 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:57:21,404 INFO L321 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2022-11-19 06:57:21,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 65 [2022-11-19 06:57:21,433 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2022-11-19 06:57:21,444 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:57:24,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19819#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12|) 0) (select (select |#memory_int| |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#b~0#1.base_BEFORE_CALL_12|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_12|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 06:57:24,142 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:57:24,143 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:57:24,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 405, 405] total 810 [2022-11-19 06:57:24,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361139250] [2022-11-19 06:57:24,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:57:24,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2022-11-19 06:57:24,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:57:24,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2022-11-19 06:57:24,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-11-19 06:57:24,215 INFO L87 Difference]: Start difference. First operand 466 states and 471 transitions. Second operand has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:57:46,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:57:46,051 INFO L93 Difference]: Finished difference Result 932 states and 1346 transitions. [2022-11-19 06:57:46,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 810 states. [2022-11-19 06:57:46,052 INFO L78 Accepts]: Start accepts. Automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 458 [2022-11-19 06:57:46,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:57:46,056 INFO L225 Difference]: With dead ends: 932 [2022-11-19 06:57:46,056 INFO L226 Difference]: Without dead ends: 871 [2022-11-19 06:57:46,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1777 GetRequests, 960 SyntacticMatches, 0 SemanticMatches, 817 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11314 ImplicationChecksByTransitivity, 266.7s TimeCoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2022-11-19 06:57:46,094 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 840 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:57:46,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 1251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 840 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 06:57:46,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2022-11-19 06:57:46,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 871. [2022-11-19 06:57:46,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 871 states, 867 states have (on average 1.0057670126874279) internal successors, (872), 867 states have internal predecessors, (872), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:57:46,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 871 states to 871 states and 876 transitions. [2022-11-19 06:57:46,149 INFO L78 Accepts]: Start accepts. Automaton has 871 states and 876 transitions. Word has length 458 [2022-11-19 06:57:46,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:57:46,150 INFO L495 AbstractCegarLoop]: Abstraction has 871 states and 876 transitions. [2022-11-19 06:57:46,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:57:46,151 INFO L276 IsEmpty]: Start isEmpty. Operand 871 states and 876 transitions. [2022-11-19 06:57:46,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 864 [2022-11-19 06:57:46,159 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:57:46,159 INFO L195 NwaCegarLoop]: trace histogram [808, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:57:46,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 06:57:46,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cc22cd51-e907-434a-9d08-b5b35e4cc737/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 06:57:46,360 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:57:46,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:57:46,361 INFO L85 PathProgramCache]: Analyzing trace with hash 2003805624, now seen corresponding path program 13 times [2022-11-19 06:57:46,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:57:46,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773494769] [2022-11-19 06:57:46,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:57:46,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms