./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW --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 5f094e7ea34d2025ab25ab51a4a0b06d8f845826c76dbd06e91f3d4a761fa19b --- 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-4e7fbc6 [2022-11-23 14:59:22,019 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:59:22,022 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:59:22,062 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:59:22,063 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:59:22,064 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:59:22,065 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:59:22,067 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:59:22,068 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:59:22,069 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:59:22,070 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:59:22,077 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:59:22,077 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:59:22,083 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:59:22,085 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:59:22,087 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:59:22,088 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:59:22,091 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:59:22,092 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:59:22,099 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:59:22,101 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:59:22,103 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:59:22,105 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:59:22,105 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:59:22,115 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:59:22,116 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:59:22,116 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:59:22,118 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:59:22,119 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:59:22,119 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:59:22,120 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:59:22,120 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:59:22,122 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:59:22,123 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:59:22,124 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:59:22,124 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:59:22,125 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:59:22,125 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:59:22,125 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:59:22,126 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:59:22,127 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:59:22,128 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:59:22,167 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:59:22,167 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:59:22,168 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:59:22,168 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:59:22,169 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:59:22,169 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:59:22,169 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:59:22,169 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:59:22,170 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:59:22,170 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:59:22,171 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:59:22,171 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:59:22,171 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:59:22,171 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:59:22,172 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:59:22,172 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:59:22,172 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:59:22,172 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:59:22,173 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:59:22,173 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:59:22,173 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:59:22,173 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:59:22,174 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:59:22,174 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:59:22,174 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:59:22,174 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:59:22,174 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:59:22,174 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:59:22,175 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:59:22,175 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:59:22,175 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:59:22,176 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:59:22,176 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:59:22,176 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:59:22,176 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:59:22,176 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:59:22,177 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:59:22,177 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:59:22,177 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:59:22,177 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:59:22,177 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:59:22,177 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_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5f094e7ea34d2025ab25ab51a4a0b06d8f845826c76dbd06e91f3d4a761fa19b [2022-11-23 14:59:22,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:59:22,501 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:59:22,504 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:59:22,505 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:59:22,506 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:59:22,507 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound5.c [2022-11-23 14:59:25,710 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:59:25,930 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:59:25,931 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound5.c [2022-11-23 14:59:25,937 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/data/c0206ad76/721661e5ea324b9f9519c32f70d74d02/FLAG35f854c45 [2022-11-23 14:59:25,951 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/data/c0206ad76/721661e5ea324b9f9519c32f70d74d02 [2022-11-23 14:59:25,954 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:59:25,956 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:59:25,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:59:25,957 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:59:25,961 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:59:25,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:59:25" (1/1) ... [2022-11-23 14:59:25,963 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59ad03af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:25, skipping insertion in model container [2022-11-23 14:59:25,963 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:59:25" (1/1) ... [2022-11-23 14:59:25,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:59:25,985 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:59:26,138 WARN L237 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_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound5.c[526,539] [2022-11-23 14:59:26,167 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:59:26,182 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:59:26,199 WARN L237 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_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound5.c[526,539] [2022-11-23 14:59:26,215 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:59:26,228 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:59:26,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26 WrapperNode [2022-11-23 14:59:26,229 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:59:26,230 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:59:26,230 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:59:26,231 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:59:26,238 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,245 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,276 INFO L138 Inliner]: procedures = 14, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 69 [2022-11-23 14:59:26,277 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:59:26,278 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:59:26,278 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:59:26,278 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:59:26,288 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,289 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,300 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,301 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,306 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,318 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,319 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,322 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,324 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:59:26,329 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:59:26,329 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:59:26,329 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:59:26,330 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (1/1) ... [2022-11-23 14:59:26,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:59:26,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:26,364 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:59:26,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:59:26,413 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:59:26,413 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:59:26,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:59:26,414 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:59:26,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:59:26,414 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:59:26,486 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:59:26,488 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:59:26,652 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:59:26,692 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:59:26,692 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 14:59:26,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:59:26 BoogieIcfgContainer [2022-11-23 14:59:26,695 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:59:26,697 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:59:26,698 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:59:26,701 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:59:26,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:59:25" (1/3) ... [2022-11-23 14:59:26,702 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447a0b86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:59:26, skipping insertion in model container [2022-11-23 14:59:26,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:59:26" (2/3) ... [2022-11-23 14:59:26,703 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447a0b86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:59:26, skipping insertion in model container [2022-11-23 14:59:26,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:59:26" (3/3) ... [2022-11-23 14:59:26,704 INFO L112 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound5.c [2022-11-23 14:59:26,724 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:59:26,724 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:59:26,771 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:59:26,778 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;@31909c8c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:59:26,778 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:59:26,783 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 14:59:26,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:59:26,790 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:26,791 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:26,792 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:26,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:26,797 INFO L85 PathProgramCache]: Analyzing trace with hash 1291730102, now seen corresponding path program 1 times [2022-11-23 14:59:26,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:26,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82267008] [2022-11-23 14:59:26,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:26,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:26,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:26,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:26,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82267008] [2022-11-23 14:59:26,970 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:59:26,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936211365] [2022-11-23 14:59:26,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:26,971 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:26,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:26,979 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:26,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:59:27,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:27,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 14:59:27,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:27,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:27,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:59:27,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936211365] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:27,094 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:59:27,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:59:27,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783725442] [2022-11-23 14:59:27,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:27,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:59:27,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:27,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:59:27,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:59:27,132 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2022-11-23 14:59:27,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:27,164 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2022-11-23 14:59:27,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:59:27,170 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 7 [2022-11-23 14:59:27,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:27,178 INFO L225 Difference]: With dead ends: 43 [2022-11-23 14:59:27,179 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:59:27,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:59:27,186 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:27,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:59:27,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:59:27,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-23 14:59:27,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:59:27,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2022-11-23 14:59:27,223 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2022-11-23 14:59:27,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:27,223 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2022-11-23 14:59:27,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2022-11-23 14:59:27,224 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2022-11-23 14:59:27,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:59:27,225 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:27,225 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:27,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:27,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-23 14:59:27,431 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:27,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:27,432 INFO L85 PathProgramCache]: Analyzing trace with hash 829671692, now seen corresponding path program 1 times [2022-11-23 14:59:27,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:27,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351631883] [2022-11-23 14:59:27,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:27,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:27,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:27,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:27,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:27,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351631883] [2022-11-23 14:59:27,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351631883] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:27,648 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:59:27,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:59:27,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740485746] [2022-11-23 14:59:27,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:27,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:59:27,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:27,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:59:27,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:59:27,651 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-11-23 14:59:27,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:27,743 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2022-11-23 14:59:27,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:59:27,744 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2022-11-23 14:59:27,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:27,745 INFO L225 Difference]: With dead ends: 33 [2022-11-23 14:59:27,745 INFO L226 Difference]: Without dead ends: 31 [2022-11-23 14:59:27,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:59:27,747 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:27,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 84 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:27,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-23 14:59:27,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2022-11-23 14:59:27,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:59:27,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-23 14:59:27,757 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2022-11-23 14:59:27,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:27,757 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-23 14:59:27,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-11-23 14:59:27,758 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-23 14:59:27,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 14:59:27,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:27,759 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:27,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:59:27,759 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:27,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:27,760 INFO L85 PathProgramCache]: Analyzing trace with hash -166824855, now seen corresponding path program 1 times [2022-11-23 14:59:27,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:27,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177696706] [2022-11-23 14:59:27,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:27,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:27,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:27,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:27,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177696706] [2022-11-23 14:59:27,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:59:27,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873719751] [2022-11-23 14:59:27,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:27,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:27,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:27,783 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:27,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:59:27,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:27,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 14:59:27,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:27,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:27,882 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:59:27,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873719751] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:27,882 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:59:27,882 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:59:27,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319345893] [2022-11-23 14:59:27,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:27,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:59:27,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:27,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:59:27,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:59:27,885 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:27,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:27,908 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2022-11-23 14:59:27,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:59:27,909 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 14:59:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:27,910 INFO L225 Difference]: With dead ends: 39 [2022-11-23 14:59:27,910 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 14:59:27,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:59:27,912 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 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 [2022-11-23 14:59:27,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:59:27,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 14:59:27,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-23 14:59:27,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:59:27,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2022-11-23 14:59:27,921 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2022-11-23 14:59:27,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:27,921 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2022-11-23 14:59:27,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:27,922 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2022-11-23 14:59:27,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-23 14:59:27,923 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:27,923 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:27,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:28,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:28,128 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:28,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:28,129 INFO L85 PathProgramCache]: Analyzing trace with hash -439138420, now seen corresponding path program 1 times [2022-11-23 14:59:28,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:28,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755922721] [2022-11-23 14:59:28,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:28,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:28,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:28,247 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:28,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:28,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755922721] [2022-11-23 14:59:28,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1755922721] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:28,248 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:59:28,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:59:28,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812784431] [2022-11-23 14:59:28,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:28,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:59:28,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:28,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:59:28,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:59:28,251 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:59:28,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:28,306 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2022-11-23 14:59:28,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:59:28,307 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-11-23 14:59:28,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:28,308 INFO L225 Difference]: With dead ends: 39 [2022-11-23 14:59:28,308 INFO L226 Difference]: Without dead ends: 37 [2022-11-23 14:59:28,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:59:28,310 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:28,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 84 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:59:28,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-23 14:59:28,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2022-11-23 14:59:28,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:59:28,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2022-11-23 14:59:28,319 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2022-11-23 14:59:28,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:28,320 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2022-11-23 14:59:28,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:59:28,320 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2022-11-23 14:59:28,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:59:28,321 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:28,321 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:28,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 14:59:28,322 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:28,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:28,323 INFO L85 PathProgramCache]: Analyzing trace with hash -235147060, now seen corresponding path program 1 times [2022-11-23 14:59:28,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:28,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269590194] [2022-11-23 14:59:28,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:28,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:28,343 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:28,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [791824968] [2022-11-23 14:59:28,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:28,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:28,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:28,345 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:28,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:59:28,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:28,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:59:28,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:28,628 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:59:28,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:28,772 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:59:28,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:28,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269590194] [2022-11-23 14:59:28,773 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:28,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791824968] [2022-11-23 14:59:28,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791824968] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:28,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1231665980] [2022-11-23 14:59:28,792 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:59:28,793 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:28,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:28,802 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:28,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:29,162 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-23 14:59:29,186 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:29,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1231665980] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:29,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:29,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8, 7] total 17 [2022-11-23 14:59:29,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603959766] [2022-11-23 14:59:29,929 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:29,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:59:29,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:29,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:59:29,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-11-23 14:59:29,931 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:59:30,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:30,129 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2022-11-23 14:59:30,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:59:30,130 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-11-23 14:59:30,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:30,131 INFO L225 Difference]: With dead ends: 49 [2022-11-23 14:59:30,131 INFO L226 Difference]: Without dead ends: 47 [2022-11-23 14:59:30,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-11-23 14:59:30,133 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 4 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:30,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 70 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:59:30,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-23 14:59:30,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-11-23 14:59:30,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:59:30,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2022-11-23 14:59:30,149 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 17 [2022-11-23 14:59:30,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:30,149 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2022-11-23 14:59:30,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:59:30,150 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2022-11-23 14:59:30,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:59:30,150 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:30,151 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:30,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:30,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:30,356 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:30,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:30,357 INFO L85 PathProgramCache]: Analyzing trace with hash 2012527405, now seen corresponding path program 1 times [2022-11-23 14:59:30,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:30,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792340121] [2022-11-23 14:59:30,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:30,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:30,371 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:30,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1645499012] [2022-11-23 14:59:30,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:30,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:30,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:30,372 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:30,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:59:30,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:30,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:59:30,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:30,549 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:30,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:30,671 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:59:30,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:30,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792340121] [2022-11-23 14:59:30,672 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:30,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645499012] [2022-11-23 14:59:30,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645499012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:30,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1313775072] [2022-11-23 14:59:30,675 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:59:30,675 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:30,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:30,676 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:30,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:31,092 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 84 for LOIs [2022-11-23 14:59:31,156 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:32,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1313775072] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:59:32,619 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:32,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 19 [2022-11-23 14:59:32,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809165707] [2022-11-23 14:59:32,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:59:32,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 14:59:32,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:32,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 14:59:32,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:59:32,621 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:59:32,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:32,900 INFO L93 Difference]: Finished difference Result 70 states and 87 transitions. [2022-11-23 14:59:32,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:59:32,900 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2022-11-23 14:59:32,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:32,901 INFO L225 Difference]: With dead ends: 70 [2022-11-23 14:59:32,901 INFO L226 Difference]: Without dead ends: 46 [2022-11-23 14:59:32,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 47 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:59:32,903 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:32,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 90 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:59:32,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-23 14:59:32,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-23 14:59:32,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 30 states have internal predecessors, (34), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:59:32,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2022-11-23 14:59:32,916 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 25 [2022-11-23 14:59:32,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:32,916 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2022-11-23 14:59:32,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:59:32,917 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2022-11-23 14:59:32,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 14:59:32,918 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:32,919 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:32,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:33,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 14:59:33,124 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:33,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:33,125 INFO L85 PathProgramCache]: Analyzing trace with hash 2127759890, now seen corresponding path program 1 times [2022-11-23 14:59:33,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:33,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124294135] [2022-11-23 14:59:33,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:33,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:33,135 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:33,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1158032733] [2022-11-23 14:59:33,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:33,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:33,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:33,137 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:33,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:59:33,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:33,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:59:33,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:59:33,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:33,296 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:59:33,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:33,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124294135] [2022-11-23 14:59:33,296 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:33,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158032733] [2022-11-23 14:59:33,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158032733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:33,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487158400] [2022-11-23 14:59:33,299 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:59:33,299 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:33,300 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:33,300 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:33,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:35,450 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:59:35,470 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:36,764 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1200#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-23 14:59:36,764 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:36,764 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:36,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-23 14:59:36,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508155915] [2022-11-23 14:59:36,765 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:36,765 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:59:36,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:36,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:59:36,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:59:36,766 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:59:36,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:36,907 INFO L93 Difference]: Finished difference Result 109 states and 130 transitions. [2022-11-23 14:59:36,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:59:36,908 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2022-11-23 14:59:36,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:36,909 INFO L225 Difference]: With dead ends: 109 [2022-11-23 14:59:36,909 INFO L226 Difference]: Without dead ends: 96 [2022-11-23 14:59:36,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:59:36,910 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 48 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:36,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 151 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:36,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-23 14:59:36,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2022-11-23 14:59:36,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 60 states have internal predecessors, (69), 20 states have call successors, (20), 12 states have call predecessors, (20), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:59:36,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2022-11-23 14:59:36,927 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 27 [2022-11-23 14:59:36,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:36,928 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2022-11-23 14:59:36,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:59:36,928 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2022-11-23 14:59:36,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 14:59:36,929 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:36,929 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-23 14:59:36,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:37,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:37,136 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:37,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:37,136 INFO L85 PathProgramCache]: Analyzing trace with hash 747162997, now seen corresponding path program 1 times [2022-11-23 14:59:37,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:37,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734615629] [2022-11-23 14:59:37,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:37,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:37,142 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:37,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [431412786] [2022-11-23 14:59:37,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:37,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:37,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:37,143 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:37,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:59:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:37,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:59:37,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:37,334 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:59:37,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:37,447 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:59:37,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:37,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734615629] [2022-11-23 14:59:37,447 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:37,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431412786] [2022-11-23 14:59:37,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431412786] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:37,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [500888636] [2022-11-23 14:59:37,450 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 14:59:37,450 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:37,451 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:37,451 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:37,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:39,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 14:59:39,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:40,348 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1719#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:40,349 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:40,349 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:40,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2022-11-23 14:59:40,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031231591] [2022-11-23 14:59:40,350 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:40,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:59:40,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:40,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:59:40,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:59:40,351 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-23 14:59:40,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:40,727 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2022-11-23 14:59:40,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:59:40,727 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) Word has length 35 [2022-11-23 14:59:40,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:40,730 INFO L225 Difference]: With dead ends: 131 [2022-11-23 14:59:40,730 INFO L226 Difference]: Without dead ends: 111 [2022-11-23 14:59:40,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=99, Invalid=453, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:59:40,731 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 40 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:40,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 119 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:59:40,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-23 14:59:40,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2022-11-23 14:59:40,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 69 states have (on average 1.1594202898550725) internal successors, (80), 73 states have internal predecessors, (80), 25 states have call successors, (25), 14 states have call predecessors, (25), 14 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2022-11-23 14:59:40,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 127 transitions. [2022-11-23 14:59:40,749 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 127 transitions. Word has length 35 [2022-11-23 14:59:40,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:40,750 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 127 transitions. [2022-11-23 14:59:40,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-23 14:59:40,750 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 127 transitions. [2022-11-23 14:59:40,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-23 14:59:40,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:40,751 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:40,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:40,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:40,961 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:40,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:40,962 INFO L85 PathProgramCache]: Analyzing trace with hash 387112662, now seen corresponding path program 1 times [2022-11-23 14:59:40,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:40,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240429728] [2022-11-23 14:59:40,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:40,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:40,972 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:40,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [167266315] [2022-11-23 14:59:40,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:40,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:40,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:40,973 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:40,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:59:41,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:41,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:59:41,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:41,159 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 11 proven. 16 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-23 14:59:41,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:41,282 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-11-23 14:59:41,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:41,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240429728] [2022-11-23 14:59:41,283 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:41,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167266315] [2022-11-23 14:59:41,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167266315] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:41,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1298795613] [2022-11-23 14:59:41,289 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:59:41,289 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:41,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:41,290 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:41,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:43,054 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:59:43,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:44,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2343#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-23 14:59:44,914 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:44,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:44,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2022-11-23 14:59:44,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615321215] [2022-11-23 14:59:44,914 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:44,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-23 14:59:44,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:44,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-23 14:59:44,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:59:44,916 INFO L87 Difference]: Start difference. First operand 109 states and 127 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:59:45,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:45,101 INFO L93 Difference]: Finished difference Result 125 states and 145 transitions. [2022-11-23 14:59:45,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 14:59:45,102 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 43 [2022-11-23 14:59:45,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:45,103 INFO L225 Difference]: With dead ends: 125 [2022-11-23 14:59:45,104 INFO L226 Difference]: Without dead ends: 121 [2022-11-23 14:59:45,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:59:45,105 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:45,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 73 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:45,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-23 14:59:45,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2022-11-23 14:59:45,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 75 states have (on average 1.1466666666666667) internal successors, (86), 78 states have internal predecessors, (86), 26 states have call successors, (26), 16 states have call predecessors, (26), 15 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2022-11-23 14:59:45,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 135 transitions. [2022-11-23 14:59:45,123 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 135 transitions. Word has length 43 [2022-11-23 14:59:45,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:45,124 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 135 transitions. [2022-11-23 14:59:45,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:59:45,124 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 135 transitions. [2022-11-23 14:59:45,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 14:59:45,125 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:45,126 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:45,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:45,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:45,331 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:45,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:45,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1125945480, now seen corresponding path program 1 times [2022-11-23 14:59:45,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:45,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940097900] [2022-11-23 14:59:45,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:45,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:45,339 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:45,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1959959376] [2022-11-23 14:59:45,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:45,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:45,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:45,341 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:45,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:59:45,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:45,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:59:45,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:45,479 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:59:45,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:45,539 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-23 14:59:45,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:45,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940097900] [2022-11-23 14:59:45,540 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:45,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959959376] [2022-11-23 14:59:45,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959959376] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:45,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1927326673] [2022-11-23 14:59:45,542 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 14:59:45,542 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:45,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:45,543 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:45,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:47,244 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:59:47,255 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:49,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2998#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:49,511 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:49,511 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:49,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2022-11-23 14:59:49,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769552791] [2022-11-23 14:59:49,511 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:49,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:59:49,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:49,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:59:49,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:59:49,513 INFO L87 Difference]: Start difference. First operand 117 states and 135 transitions. Second operand has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 9 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-23 14:59:49,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:49,687 INFO L93 Difference]: Finished difference Result 173 states and 196 transitions. [2022-11-23 14:59:49,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:59:49,687 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 9 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 48 [2022-11-23 14:59:49,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:49,689 INFO L225 Difference]: With dead ends: 173 [2022-11-23 14:59:49,689 INFO L226 Difference]: Without dead ends: 151 [2022-11-23 14:59:49,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:59:49,690 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 53 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:49,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 154 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:59:49,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-23 14:59:49,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 148. [2022-11-23 14:59:49,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 96 states have (on average 1.125) internal successors, (108), 100 states have internal predecessors, (108), 31 states have call successors, (31), 20 states have call predecessors, (31), 20 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-23 14:59:49,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 167 transitions. [2022-11-23 14:59:49,710 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 167 transitions. Word has length 48 [2022-11-23 14:59:49,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:49,715 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 167 transitions. [2022-11-23 14:59:49,715 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 9 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-23 14:59:49,715 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 167 transitions. [2022-11-23 14:59:49,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-23 14:59:49,717 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:49,717 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:49,735 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-23 14:59:49,922 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:49,922 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:49,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:49,923 INFO L85 PathProgramCache]: Analyzing trace with hash -1127123487, now seen corresponding path program 1 times [2022-11-23 14:59:49,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:49,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242677430] [2022-11-23 14:59:49,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:49,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:49,931 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:49,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1848489418] [2022-11-23 14:59:49,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:49,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:49,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:49,933 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:49,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:59:49,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:50,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-23 14:59:50,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:50,327 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 14:59:50,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:52,714 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 14:59:52,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:52,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242677430] [2022-11-23 14:59:52,715 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:52,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848489418] [2022-11-23 14:59:52,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848489418] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:52,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410354113] [2022-11-23 14:59:52,717 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:59:52,717 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:52,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:52,718 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:52,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:55,455 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:59:55,466 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:57,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3817#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:57,306 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:57,306 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:57,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2022-11-23 14:59:57,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950234286] [2022-11-23 14:59:57,307 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:57,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:59:57,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:57,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:59:57,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:59:57,309 INFO L87 Difference]: Start difference. First operand 148 states and 167 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2022-11-23 14:59:59,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:59,955 INFO L93 Difference]: Finished difference Result 177 states and 196 transitions. [2022-11-23 14:59:59,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:59:59,955 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) Word has length 56 [2022-11-23 14:59:59,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:59,957 INFO L225 Difference]: With dead ends: 177 [2022-11-23 14:59:59,957 INFO L226 Difference]: Without dead ends: 173 [2022-11-23 14:59:59,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:59:59,959 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 59 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:59,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 125 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-23 14:59:59,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-23 15:00:00,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 169. [2022-11-23 15:00:00,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 112 states have (on average 1.1071428571428572) internal successors, (124), 116 states have internal predecessors, (124), 32 states have call successors, (32), 25 states have call predecessors, (32), 24 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2022-11-23 15:00:00,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 185 transitions. [2022-11-23 15:00:00,007 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 185 transitions. Word has length 56 [2022-11-23 15:00:00,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:00,007 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 185 transitions. [2022-11-23 15:00:00,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2022-11-23 15:00:00,008 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 185 transitions. [2022-11-23 15:00:00,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-23 15:00:00,009 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:00,010 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:00,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:00,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:00,215 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:00,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:00,216 INFO L85 PathProgramCache]: Analyzing trace with hash -143001442, now seen corresponding path program 1 times [2022-11-23 15:00:00,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:00,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736028281] [2022-11-23 15:00:00,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:00,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:00,224 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:00:00,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1566766129] [2022-11-23 15:00:00,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:00,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:00,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:00,229 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:00,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 15:00:00,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:00,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-23 15:00:00,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:00,644 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 19 proven. 39 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:00:00,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:01,241 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 19 proven. 39 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 15:00:01,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:01,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736028281] [2022-11-23 15:00:01,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:00:01,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566766129] [2022-11-23 15:00:01,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566766129] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:01,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118420806] [2022-11-23 15:00:01,243 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:00:01,243 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:01,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:01,244 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:01,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:03,898 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:00:03,908 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:06,311 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4743#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:00:06,311 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:06,311 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:00:06,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2022-11-23 15:00:06,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205678170] [2022-11-23 15:00:06,311 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:06,312 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 15:00:06,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:06,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 15:00:06,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=780, Unknown=0, NotChecked=0, Total=930 [2022-11-23 15:00:06,313 INFO L87 Difference]: Start difference. First operand 169 states and 185 transitions. Second operand has 17 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 15:00:07,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:07,421 INFO L93 Difference]: Finished difference Result 188 states and 208 transitions. [2022-11-23 15:00:07,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 15:00:07,422 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) Word has length 67 [2022-11-23 15:00:07,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:07,424 INFO L225 Difference]: With dead ends: 188 [2022-11-23 15:00:07,424 INFO L226 Difference]: Without dead ends: 161 [2022-11-23 15:00:07,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 168 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=207, Invalid=1053, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 15:00:07,425 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 64 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:07,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 114 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 15:00:07,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-11-23 15:00:07,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 148. [2022-11-23 15:00:07,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 98 states have (on average 1.1224489795918366) internal successors, (110), 100 states have internal predecessors, (110), 28 states have call successors, (28), 22 states have call predecessors, (28), 21 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2022-11-23 15:00:07,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 164 transitions. [2022-11-23 15:00:07,474 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 164 transitions. Word has length 67 [2022-11-23 15:00:07,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:07,475 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 164 transitions. [2022-11-23 15:00:07,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 15:00:07,475 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 164 transitions. [2022-11-23 15:00:07,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-23 15:00:07,476 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:07,476 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:07,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:07,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-23 15:00:07,676 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:07,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:07,677 INFO L85 PathProgramCache]: Analyzing trace with hash -319401384, now seen corresponding path program 1 times [2022-11-23 15:00:07,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:07,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803025817] [2022-11-23 15:00:07,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:07,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:07,684 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:00:07,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2066436076] [2022-11-23 15:00:07,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:07,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:07,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:07,690 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:07,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 15:00:07,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:07,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 15:00:07,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:07,800 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2022-11-23 15:00:07,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:00:07,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:07,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803025817] [2022-11-23 15:00:07,801 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:00:07,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066436076] [2022-11-23 15:00:07,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066436076] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:00:07,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:00:07,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 15:00:07,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400285922] [2022-11-23 15:00:07,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:00:07,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:00:07,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:07,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:00:07,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:00:07,802 INFO L87 Difference]: Start difference. First operand 148 states and 164 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 15:00:07,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:07,898 INFO L93 Difference]: Finished difference Result 163 states and 179 transitions. [2022-11-23 15:00:07,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:00:07,899 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 77 [2022-11-23 15:00:07,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:07,900 INFO L225 Difference]: With dead ends: 163 [2022-11-23 15:00:07,900 INFO L226 Difference]: Without dead ends: 143 [2022-11-23 15:00:07,901 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:00:07,902 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:07,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 77 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:00:07,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-23 15:00:07,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2022-11-23 15:00:07,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 93 states have (on average 1.096774193548387) internal successors, (102), 95 states have internal predecessors, (102), 26 states have call successors, (26), 20 states have call predecessors, (26), 20 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-11-23 15:00:07,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 153 transitions. [2022-11-23 15:00:07,941 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 153 transitions. Word has length 77 [2022-11-23 15:00:07,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:07,941 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 153 transitions. [2022-11-23 15:00:07,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 15:00:07,942 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 153 transitions. [2022-11-23 15:00:07,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 15:00:07,943 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:07,943 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:07,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:08,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:08,149 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:08,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:08,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1379671488, now seen corresponding path program 2 times [2022-11-23 15:00:08,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:08,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367342399] [2022-11-23 15:00:08,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:08,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:08,157 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:00:08,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [820631978] [2022-11-23 15:00:08,157 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:00:08,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:08,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:08,166 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:08,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 15:00:08,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 15:00:08,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:08,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-23 15:00:08,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:08,509 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 41 proven. 38 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2022-11-23 15:00:08,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:09,810 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 237 trivial. 0 not checked. [2022-11-23 15:00:09,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367342399] [2022-11-23 15:00:09,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:00:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820631978] [2022-11-23 15:00:09,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820631978] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211909822] [2022-11-23 15:00:09,815 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 15:00:09,815 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:09,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:09,816 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:09,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:12,169 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:00:12,178 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:14,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6389#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:00:14,000 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:14,000 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:00:14,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2022-11-23 15:00:14,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744716796] [2022-11-23 15:00:14,001 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:14,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 15:00:14,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:14,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 15:00:14,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=733, Unknown=0, NotChecked=0, Total=870 [2022-11-23 15:00:14,002 INFO L87 Difference]: Start difference. First operand 140 states and 153 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 9 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2022-11-23 15:00:21,561 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:00:23,572 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:00:24,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:24,036 INFO L93 Difference]: Finished difference Result 162 states and 185 transitions. [2022-11-23 15:00:24,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:00:24,037 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 9 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) Word has length 79 [2022-11-23 15:00:24,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:24,038 INFO L225 Difference]: With dead ends: 162 [2022-11-23 15:00:24,038 INFO L226 Difference]: Without dead ends: 160 [2022-11-23 15:00:24,039 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 201 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=168, Invalid=888, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 15:00:24,040 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 61 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 70 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:24,040 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 131 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 330 Invalid, 2 Unknown, 0 Unchecked, 5.2s Time] [2022-11-23 15:00:24,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-23 15:00:24,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2022-11-23 15:00:24,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 102 states have (on average 1.1176470588235294) internal successors, (114), 105 states have internal predecessors, (114), 32 states have call successors, (32), 21 states have call predecessors, (32), 21 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-23 15:00:24,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 177 transitions. [2022-11-23 15:00:24,107 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 177 transitions. Word has length 79 [2022-11-23 15:00:24,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:24,108 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 177 transitions. [2022-11-23 15:00:24,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 9 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2022-11-23 15:00:24,109 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 177 transitions. [2022-11-23 15:00:24,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-11-23 15:00:24,113 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:24,113 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:24,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:24,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:24,318 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:24,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:24,318 INFO L85 PathProgramCache]: Analyzing trace with hash -501231567, now seen corresponding path program 1 times [2022-11-23 15:00:24,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:24,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883381598] [2022-11-23 15:00:24,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:24,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:24,325 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:00:24,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [107142379] [2022-11-23 15:00:24,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:24,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:24,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:24,326 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:24,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 15:00:24,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:24,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 15:00:24,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:24,528 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 72 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-23 15:00:24,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:24,624 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 26 proven. 44 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-11-23 15:00:24,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:24,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883381598] [2022-11-23 15:00:24,625 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:00:24,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107142379] [2022-11-23 15:00:24,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107142379] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:24,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1775375810] [2022-11-23 15:00:24,627 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 15:00:24,627 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:24,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:24,627 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:24,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:26,123 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:00:26,133 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:27,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7380#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:00:27,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:27,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:00:27,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 8 [2022-11-23 15:00:27,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406876167] [2022-11-23 15:00:27,749 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:27,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 15:00:27,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:27,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 15:00:27,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:00:27,750 INFO L87 Difference]: Start difference. First operand 156 states and 177 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 8 states have internal predecessors, (37), 5 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (26), 5 states have call predecessors, (26), 5 states have call successors, (26) [2022-11-23 15:00:27,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:27,929 INFO L93 Difference]: Finished difference Result 202 states and 230 transitions. [2022-11-23 15:00:27,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:00:27,929 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 8 states have internal predecessors, (37), 5 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (26), 5 states have call predecessors, (26), 5 states have call successors, (26) Word has length 86 [2022-11-23 15:00:27,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:27,931 INFO L225 Difference]: With dead ends: 202 [2022-11-23 15:00:27,931 INFO L226 Difference]: Without dead ends: 158 [2022-11-23 15:00:27,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 228 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:00:27,933 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 9 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:27,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 147 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:00:27,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-23 15:00:27,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2022-11-23 15:00:27,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 104 states have (on average 1.1153846153846154) internal successors, (116), 107 states have internal predecessors, (116), 32 states have call successors, (32), 21 states have call predecessors, (32), 21 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-23 15:00:27,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 179 transitions. [2022-11-23 15:00:27,968 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 179 transitions. Word has length 86 [2022-11-23 15:00:27,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:27,968 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 179 transitions. [2022-11-23 15:00:27,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 8 states have internal predecessors, (37), 5 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (26), 5 states have call predecessors, (26), 5 states have call successors, (26) [2022-11-23 15:00:27,969 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 179 transitions. [2022-11-23 15:00:27,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-23 15:00:27,970 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:27,970 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-23 15:00:27,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:28,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-23 15:00:28,171 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:28,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:28,171 INFO L85 PathProgramCache]: Analyzing trace with hash 1528689375, now seen corresponding path program 3 times [2022-11-23 15:00:28,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:28,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328872454] [2022-11-23 15:00:28,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:28,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:28,179 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:00:28,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1807720562] [2022-11-23 15:00:28,180 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:00:28,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:28,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:28,181 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:28,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 15:00:28,304 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:00:28,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:28,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-23 15:00:28,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:48,527 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 114 proven. 61 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-23 15:00:48,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:17,511 WARN L233 SmtUtils]: Spent 11.18s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:02:37,090 WARN L233 SmtUtils]: Spent 28.32s on a formula simplification that was a NOOP. DAG size: 120 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:04:29,332 WARN L233 SmtUtils]: Spent 6.60s on a formula simplification that was a NOOP. DAG size: 79 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:06:03,826 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 113 proven. 32 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2022-11-23 15:06:03,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:06:03,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328872454] [2022-11-23 15:06:03,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:06:03,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807720562] [2022-11-23 15:06:03,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807720562] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:06:03,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252403104] [2022-11-23 15:06:03,829 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 15:06:03,830 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:06:03,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:06:03,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:06:03,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:06:06,631 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:06:06,643 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:06:13,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8453#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:06:13,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:06:13,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:06:13,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2022-11-23 15:06:13,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874260126] [2022-11-23 15:06:13,801 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:06:13,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 15:06:13,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:06:13,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 15:06:13,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1158, Unknown=2, NotChecked=0, Total=1406 [2022-11-23 15:06:13,803 INFO L87 Difference]: Start difference. First operand 158 states and 179 transitions. Second operand has 25 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 17 states have internal predecessors, (46), 16 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 13 states have call predecessors, (24), 14 states have call successors, (24) [2022-11-23 15:07:45,584 WARN L233 SmtUtils]: Spent 1.51m on a formula simplification. DAG size of input: 196 DAG size of output: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:07:50,693 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:03,471 WARN L233 SmtUtils]: Spent 8.17s on a formula simplification. DAG size of input: 147 DAG size of output: 48 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:08:11,783 WARN L233 SmtUtils]: Spent 5.93s on a formula simplification. DAG size of input: 147 DAG size of output: 48 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:08:14,147 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:16,663 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:23,672 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:26,172 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:29,610 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:31,612 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:33,981 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:37,164 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:39,166 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:41,655 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:43,136 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:44,425 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:08:46,494 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:53,638 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:09:02,329 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:10:05,176 WARN L233 SmtUtils]: Spent 55.57s on a formula simplification. DAG size of input: 168 DAG size of output: 86 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:10:06,520 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:10:10,200 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:10:27,618 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:10:28,960 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:11:11,687 WARN L233 SmtUtils]: Spent 33.05s on a formula simplification. DAG size of input: 151 DAG size of output: 64 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:11:13,866 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:11:15,871 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:11:18,004 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:11:31,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:11:31,709 INFO L93 Difference]: Finished difference Result 213 states and 250 transitions. [2022-11-23 15:11:31,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 15:11:31,710 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 17 states have internal predecessors, (46), 16 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 13 states have call predecessors, (24), 14 states have call successors, (24) Word has length 87 [2022-11-23 15:11:31,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:11:31,712 INFO L225 Difference]: With dead ends: 213 [2022-11-23 15:11:31,712 INFO L226 Difference]: Without dead ends: 206 [2022-11-23 15:11:31,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 996 ImplicationChecksByTransitivity, 340.7s TimeCoverageRelationStatistics Valid=419, Invalid=2026, Unknown=5, NotChecked=0, Total=2450 [2022-11-23 15:11:31,713 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 131 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 695 mSolverCounterSat, 192 mSolverCounterUnsat, 15 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 62.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 695 IncrementalHoareTripleChecker+Invalid, 15 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 62.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:11:31,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 237 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 695 Invalid, 15 Unknown, 0 Unchecked, 62.2s Time] [2022-11-23 15:11:31,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-23 15:11:31,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 186. [2022-11-23 15:11:31,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 123 states have (on average 1.1219512195121952) internal successors, (138), 128 states have internal predecessors, (138), 37 states have call successors, (37), 25 states have call predecessors, (37), 25 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2022-11-23 15:11:31,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 210 transitions. [2022-11-23 15:11:31,783 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 210 transitions. Word has length 87 [2022-11-23 15:11:31,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:11:31,783 INFO L495 AbstractCegarLoop]: Abstraction has 186 states and 210 transitions. [2022-11-23 15:11:31,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 17 states have internal predecessors, (46), 16 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 13 states have call predecessors, (24), 14 states have call successors, (24) [2022-11-23 15:11:31,784 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 210 transitions. [2022-11-23 15:11:31,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-23 15:11:31,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:11:31,786 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:11:31,798 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-23 15:11:31,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 15:11:31,992 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:11:31,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:11:31,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1526961497, now seen corresponding path program 1 times [2022-11-23 15:11:31,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:11:31,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281001689] [2022-11-23 15:11:31,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:11:31,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:11:32,003 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:11:32,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1664469036] [2022-11-23 15:11:32,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:11:32,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:11:32,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:11:32,006 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:11:32,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 15:11:32,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:11:32,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-23 15:11:32,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:11:32,746 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 25 proven. 64 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-23 15:11:32,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:11:51,346 WARN L233 SmtUtils]: Spent 5.29s on a formula simplification that was a NOOP. DAG size: 210 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:12:55,018 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 25 proven. 64 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-23 15:12:55,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:12:55,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281001689] [2022-11-23 15:12:55,019 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:12:55,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664469036] [2022-11-23 15:12:55,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664469036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:12:55,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459452127] [2022-11-23 15:12:55,021 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:12:55,021 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:12:55,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:12:55,022 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:12:55,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:12:57,896 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:12:57,909 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:13:01,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9609#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:13:01,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:13:01,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:13:01,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2022-11-23 15:13:01,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284724594] [2022-11-23 15:13:01,677 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:13:01,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-23 15:13:01,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:13:01,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-23 15:13:01,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1045, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 15:13:01,680 INFO L87 Difference]: Start difference. First operand 186 states and 210 transitions. Second operand has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 19 states have internal predecessors, (49), 13 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 10 states have call predecessors, (26), 11 states have call successors, (26) [2022-11-23 15:13:05,161 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:13:17,081 WARN L233 SmtUtils]: Spent 6.05s on a formula simplification that was a NOOP. DAG size: 194 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:13:34,838 WARN L233 SmtUtils]: Spent 15.99s on a formula simplification. DAG size of input: 196 DAG size of output: 155 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:13:37,541 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:13:37,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:13:37,899 INFO L93 Difference]: Finished difference Result 208 states and 240 transitions. [2022-11-23 15:13:37,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 15:13:37,899 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 19 states have internal predecessors, (49), 13 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 10 states have call predecessors, (26), 11 states have call successors, (26) Word has length 87 [2022-11-23 15:13:37,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:13:37,901 INFO L225 Difference]: With dead ends: 208 [2022-11-23 15:13:37,901 INFO L226 Difference]: Without dead ends: 206 [2022-11-23 15:13:37,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 223 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 41.3s TimeCoverageRelationStatistics Valid=197, Invalid=1443, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 15:13:37,903 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 74 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 96 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:13:37,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 209 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 729 Invalid, 2 Unknown, 0 Unchecked, 9.0s Time] [2022-11-23 15:13:37,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-23 15:13:37,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 186. [2022-11-23 15:13:38,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 123 states have (on average 1.1219512195121952) internal successors, (138), 128 states have internal predecessors, (138), 37 states have call successors, (37), 25 states have call predecessors, (37), 25 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2022-11-23 15:13:38,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 210 transitions. [2022-11-23 15:13:38,001 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 210 transitions. Word has length 87 [2022-11-23 15:13:38,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:13:38,002 INFO L495 AbstractCegarLoop]: Abstraction has 186 states and 210 transitions. [2022-11-23 15:13:38,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 19 states have internal predecessors, (49), 13 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 10 states have call predecessors, (26), 11 states have call successors, (26) [2022-11-23 15:13:38,002 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 210 transitions. [2022-11-23 15:13:38,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-23 15:13:38,004 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:13:38,004 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:13:38,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-23 15:13:38,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:13:38,211 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:13:38,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:13:38,211 INFO L85 PathProgramCache]: Analyzing trace with hash -29779425, now seen corresponding path program 1 times [2022-11-23 15:13:38,212 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:13:38,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954034831] [2022-11-23 15:13:38,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:13:38,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:13:38,220 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:13:38,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [89645962] [2022-11-23 15:13:38,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:13:38,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:13:38,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:13:38,222 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:13:38,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 15:13:38,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:13:38,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-23 15:13:38,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:13:38,641 INFO L134 CoverageAnalysis]: Checked inductivity of 419 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-23 15:13:38,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:13:39,953 INFO L134 CoverageAnalysis]: Checked inductivity of 419 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-23 15:13:39,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:13:39,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954034831] [2022-11-23 15:13:39,953 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:13:39,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89645962] [2022-11-23 15:13:39,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89645962] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:13:39,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189027543] [2022-11-23 15:13:39,956 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-23 15:13:39,956 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:13:39,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:13:39,957 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:13:39,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:13:42,637 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 15:13:42,641 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:13:44,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10768#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:13:44,464 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:13:44,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:13:44,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2022-11-23 15:13:44,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137712866] [2022-11-23 15:13:44,465 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:13:44,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 15:13:44,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:13:44,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 15:13:44,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 15:13:44,467 INFO L87 Difference]: Start difference. First operand 186 states and 210 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 12 states have call predecessors, (28), 14 states have call successors, (28) [2022-11-23 15:13:45,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:13:45,237 INFO L93 Difference]: Finished difference Result 209 states and 237 transitions. [2022-11-23 15:13:45,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 15:13:45,238 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 12 states have call predecessors, (28), 14 states have call successors, (28) Word has length 92 [2022-11-23 15:13:45,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:13:45,239 INFO L225 Difference]: With dead ends: 209 [2022-11-23 15:13:45,240 INFO L226 Difference]: Without dead ends: 155 [2022-11-23 15:13:45,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 236 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=162, Invalid=1320, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 15:13:45,241 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 43 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:13:45,242 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 242 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 15:13:45,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-23 15:13:45,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2022-11-23 15:13:45,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 103 states have (on average 1.1067961165048543) internal successors, (114), 107 states have internal predecessors, (114), 29 states have call successors, (29), 22 states have call predecessors, (29), 22 states have return successors, (27), 25 states have call predecessors, (27), 27 states have call successors, (27) [2022-11-23 15:13:45,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 170 transitions. [2022-11-23 15:13:45,369 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 170 transitions. Word has length 92 [2022-11-23 15:13:45,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:13:45,370 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 170 transitions. [2022-11-23 15:13:45,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 12 states have call predecessors, (28), 14 states have call successors, (28) [2022-11-23 15:13:45,371 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 170 transitions. [2022-11-23 15:13:45,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-23 15:13:45,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:13:45,372 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:13:45,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 15:13:45,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 15:13:45,584 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:13:45,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:13:45,585 INFO L85 PathProgramCache]: Analyzing trace with hash -1379555575, now seen corresponding path program 2 times [2022-11-23 15:13:45,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:13:45,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983139505] [2022-11-23 15:13:45,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:13:45,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:13:45,597 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:13:45,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [554763522] [2022-11-23 15:13:45,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:13:45,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:13:45,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:13:45,599 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:13:45,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 15:13:45,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:13:45,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2022-11-23 15:13:45,703 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-11-23 15:13:45,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-23 15:13:45,798 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-11-23 15:13:45,799 INFO L359 BasicCegarLoop]: Counterexample is feasible [2022-11-23 15:13:45,800 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-23 15:13:45,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 15:13:46,008 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:13:46,011 INFO L444 BasicCegarLoop]: Path program histogram: [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:13:46,014 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-23 15:13:46,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 03:13:46 BoogieIcfgContainer [2022-11-23 15:13:46,070 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-23 15:13:46,071 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-23 15:13:46,071 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-23 15:13:46,071 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-23 15:13:46,072 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:59:26" (3/4) ... [2022-11-23 15:13:46,074 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-11-23 15:13:46,185 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/witness.graphml [2022-11-23 15:13:46,185 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-23 15:13:46,192 INFO L158 Benchmark]: Toolchain (without parser) took 860230.36ms. Allocated memory was 192.9MB in the beginning and 488.6MB in the end (delta: 295.7MB). Free memory was 150.7MB in the beginning and 408.2MB in the end (delta: -257.5MB). Peak memory consumption was 40.0MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,192 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 115.3MB. Free memory was 57.9MB in the beginning and 57.8MB in the end (delta: 117.6kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-23 15:13:46,193 INFO L158 Benchmark]: CACSL2BoogieTranslator took 272.27ms. Allocated memory is still 192.9MB. Free memory was 150.4MB in the beginning and 140.0MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,196 INFO L158 Benchmark]: Boogie Procedure Inliner took 47.12ms. Allocated memory is still 192.9MB. Free memory was 140.0MB in the beginning and 137.9MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,197 INFO L158 Benchmark]: Boogie Preprocessor took 50.04ms. Allocated memory is still 192.9MB. Free memory was 137.9MB in the beginning and 136.7MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,197 INFO L158 Benchmark]: RCFGBuilder took 366.73ms. Allocated memory is still 192.9MB. Free memory was 136.7MB in the beginning and 124.1MB in the end (delta: 12.6MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,199 INFO L158 Benchmark]: TraceAbstraction took 859372.79ms. Allocated memory was 192.9MB in the beginning and 488.6MB in the end (delta: 295.7MB). Free memory was 123.6MB in the beginning and 412.4MB in the end (delta: -288.9MB). Peak memory consumption was 8.5MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,200 INFO L158 Benchmark]: Witness Printer took 114.57ms. Allocated memory is still 488.6MB. Free memory was 412.4MB in the beginning and 408.2MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-11-23 15:13:46,201 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 115.3MB. Free memory was 57.9MB in the beginning and 57.8MB in the end (delta: 117.6kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 272.27ms. Allocated memory is still 192.9MB. Free memory was 150.4MB in the beginning and 140.0MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 47.12ms. Allocated memory is still 192.9MB. Free memory was 140.0MB in the beginning and 137.9MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 50.04ms. Allocated memory is still 192.9MB. Free memory was 137.9MB in the beginning and 136.7MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 366.73ms. Allocated memory is still 192.9MB. Free memory was 136.7MB in the beginning and 124.1MB in the end (delta: 12.6MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 859372.79ms. Allocated memory was 192.9MB in the beginning and 488.6MB in the end (delta: 295.7MB). Free memory was 123.6MB in the beginning and 412.4MB in the end (delta: -288.9MB). Peak memory consumption was 8.5MB. Max. memory is 16.1GB. * Witness Printer took 114.57ms. Allocated memory is still 488.6MB. Free memory was 412.4MB in the beginning and 408.2MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L22] int counter = 0; [L24] int A, B; [L25] int r, d, p, q; [L26] A = __VERIFIER_nondet_int() [L27] B = 1 [L29] r = A [L30] d = B [L31] p = 1 [L32] q = 0 VAL [A=4, B=1, counter=0, d=1, p=1, q=0, r=4] [L34] EXPR counter++ VAL [A=4, B=1, counter=1, counter++=0, d=1, p=1, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [counter=1, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=1, unknown-#in~cond-unknown=1] [L35] RET __VERIFIER_assert(q == 0) VAL [A=4, B=1, counter=1, d=1, p=1, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [counter=1, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=1, unknown-#in~cond-unknown=1] [L36] RET __VERIFIER_assert(r == A) VAL [A=4, B=1, counter=1, d=1, p=1, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [counter=1, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=1, unknown-#in~cond-unknown=1] [L37] RET __VERIFIER_assert(d == B * p) VAL [A=4, B=1, counter=1, d=1, p=1, q=0, r=4] [L38] COND FALSE !(!(r >= d)) [L40] d = 2 * d [L41] p = 2 * p VAL [A=4, B=1, counter=1, d=2, p=2, q=0, r=4] [L34] EXPR counter++ VAL [A=4, B=1, counter=2, counter++=1, d=2, p=2, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [counter=2, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=2, unknown-#in~cond-unknown=1] [L35] RET __VERIFIER_assert(q == 0) VAL [A=4, B=1, counter=2, d=2, p=2, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [counter=2, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=2, unknown-#in~cond-unknown=1] [L36] RET __VERIFIER_assert(r == A) VAL [A=4, B=1, counter=2, d=2, p=2, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [counter=2, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=2, unknown-#in~cond-unknown=1] [L37] RET __VERIFIER_assert(d == B * p) VAL [A=4, B=1, counter=2, d=2, p=2, q=0, r=4] [L38] COND FALSE !(!(r >= d)) [L40] d = 2 * d [L41] p = 2 * p VAL [A=4, B=1, counter=2, d=4, p=4, q=0, r=4] [L34] EXPR counter++ VAL [A=4, B=1, counter=3, counter++=2, d=4, p=4, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [counter=3, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=3, unknown-#in~cond-unknown=1] [L35] RET __VERIFIER_assert(q == 0) VAL [A=4, B=1, counter=3, d=4, p=4, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [counter=3, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=3, unknown-#in~cond-unknown=1] [L36] RET __VERIFIER_assert(r == A) VAL [A=4, B=1, counter=3, d=4, p=4, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [counter=3, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=3, unknown-#in~cond-unknown=1] [L37] RET __VERIFIER_assert(d == B * p) VAL [A=4, B=1, counter=3, d=4, p=4, q=0, r=4] [L38] COND FALSE !(!(r >= d)) [L40] d = 2 * d [L41] p = 2 * p VAL [A=4, B=1, counter=3, d=8, p=8, q=0, r=4] [L34] EXPR counter++ VAL [A=4, B=1, counter=4, counter++=3, d=8, p=8, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [counter=4, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=4, unknown-#in~cond-unknown=1] [L35] RET __VERIFIER_assert(q == 0) VAL [A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [counter=4, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=4, unknown-#in~cond-unknown=1] [L36] RET __VERIFIER_assert(r == A) VAL [A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [counter=4, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=4, unknown-#in~cond-unknown=1] [L37] RET __VERIFIER_assert(d == B * p) VAL [A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L38] COND TRUE !(r >= d) VAL [A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L44] EXPR counter++ VAL [A=4, B=1, counter=5, counter++=4, d=8, p=8, q=0, r=4] [L44] COND TRUE counter++<5 [L45] CALL __VERIFIER_assert(A == q*B + r) VAL [counter=5, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=5, unknown-#in~cond-unknown=1] [L45] RET __VERIFIER_assert(A == q*B + r) VAL [A=4, B=1, counter=5, d=8, p=8, q=0, r=4] [L46] CALL __VERIFIER_assert(d == B*p) VAL [counter=5, unknown-#in~cond-unknown=1] [L15] COND FALSE !(!(cond)) VAL [cond=1, counter=5, unknown-#in~cond-unknown=1] [L46] RET __VERIFIER_assert(d == B*p) VAL [A=4, B=1, counter=5, d=8, p=8, q=0, r=4] [L48] COND FALSE !(!(p != 1)) [L50] d = d / 2 [L51] p = p / 2 [L52] COND TRUE r >= d [L53] r = r - d [L54] q = q + p VAL [A=4, B=1, counter=5, d=4, p=4, q=4, r=0] [L44] EXPR counter++ VAL [A=4, B=1, counter=6, counter++=5, d=4, p=4, q=4, r=0] [L44] COND FALSE !(counter++<5) [L58] CALL __VERIFIER_assert(A == d*q + r) VAL [counter=6, unknown-#in~cond-unknown=0] [L15] COND TRUE !(cond) VAL [cond=0, counter=6, unknown-#in~cond-unknown=0] [L17] reach_error() VAL [cond=0, counter=6, unknown-#in~cond-unknown=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 859.3s, OverallIterations: 19, TraceHistogramMax: 15, PathProgramHistogramMax: 3, EmptinessCheckTime: 0.0s, AutomataDifference: 370.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 19 mSolverCounterUnknown, 727 SdHoareTripleChecker+Valid, 80.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 656 mSDsluCounter, 2208 SdHoareTripleChecker+Invalid, 79.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1665 mSDsCounter, 660 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 4133 IncrementalHoareTripleChecker+Invalid, 4812 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 660 mSolverCounterUnsat, 543 mSDtfsCounter, 4133 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 2374 GetRequests, 1940 SyntacticMatches, 61 SemanticMatches, 373 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4074 ImplicationChecksByTransitivity, 408.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=186occurred in iteration=16, InterpolantAutomatonStates: 179, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 18 MinimizatonAttempts, 94 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 427.4s InterpolantComputationTime, 969 NumberOfCodeBlocks, 930 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 1579 ConstructedInterpolants, 8 QuantifiedInterpolants, 35530 SizeOfPredicates, 49 NumberOfNonLiveVariables, 2446 ConjunctsInSsa, 329 ConjunctsInUnsatCore, 31 InterpolantComputations, 5 PerfectInterpolantSequences, 4250/5256 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 0.9s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 4, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 29, DAG_INTERPRETER_EARLY_EXITS: 2, TOOLS_POST_APPLICATIONS: 23, TOOLS_POST_TIME: 0.2s, TOOLS_POST_CALL_APPLICATIONS: 17, TOOLS_POST_CALL_TIME: 0.2s, TOOLS_POST_RETURN_APPLICATIONS: 10, TOOLS_POST_RETURN_TIME: 0.1s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 50, TOOLS_QUANTIFIERELIM_TIME: 0.4s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.0s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 72, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 21, DOMAIN_JOIN_TIME: 0.3s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 29, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 10, CALL_SUMMARIZER_CACHE_MISSES: 2, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 216, DAG_COMPRESSION_RETAINED_NODES: 80, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-11-23 15:13:46,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0ac1d6e-f368-427c-afb9-ce130b22b2e8/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE