./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur --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 be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- 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-38b53e6 [2022-11-25 23:38:18,041 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:38:18,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:38:18,068 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:38:18,068 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:38:18,070 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:38:18,071 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:38:18,074 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:38:18,076 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:38:18,077 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:38:18,079 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:38:18,080 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:38:18,081 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:38:18,083 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:38:18,084 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:38:18,086 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:38:18,087 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:38:18,089 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:38:18,091 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:38:18,093 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:38:18,095 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:38:18,097 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:38:18,099 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:38:18,100 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:38:18,105 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:38:18,113 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:38:18,114 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:38:18,115 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:38:18,116 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:38:18,117 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:38:18,117 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:38:18,118 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:38:18,122 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:38:18,123 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:38:18,126 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:38:18,127 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:38:18,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:38:18,129 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:38:18,130 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:38:18,141 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:38:18,142 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:38:18,144 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:38:18,210 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:38:18,210 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:38:18,211 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:38:18,211 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:38:18,212 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:38:18,213 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:38:18,213 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:38:18,213 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:38:18,213 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:38:18,214 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:38:18,215 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:38:18,216 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:38:18,216 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:38:18,216 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:38:18,216 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:38:18,217 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:38:18,217 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:38:18,217 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:38:18,218 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:38:18,218 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:38:18,219 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:38:18,219 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:38:18,219 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:38:18,219 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:38:18,220 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:38:18,220 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:38:18,220 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:38:18,221 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:38:18,221 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:38:18,221 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:38:18,221 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:38:18,222 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:38:18,222 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:38:18,223 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:38:18,223 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:38:18,223 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:38:18,224 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:38:18,224 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:38:18,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:38:18,224 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:38:18,225 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:38:18,225 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_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2022-11-25 23:38:18,541 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:38:18,583 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:38:18,586 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:38:18,587 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:38:18,588 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:38:18,590 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-11-25 23:38:22,093 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:38:22,336 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:38:22,337 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-11-25 23:38:22,356 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/data/1beb6a0ad/a79f0b8780254f32a1f4472d2e37a6b2/FLAG07010373d [2022-11-25 23:38:22,384 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/data/1beb6a0ad/a79f0b8780254f32a1f4472d2e37a6b2 [2022-11-25 23:38:22,392 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:38:22,396 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:38:22,400 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:38:22,400 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:38:22,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:38:22,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,408 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56d0bca1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22, skipping insertion in model container [2022-11-25 23:38:22,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,417 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:38:22,441 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:38:22,659 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_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-11-25 23:38:22,684 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:38:22,697 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:38:22,716 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_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-11-25 23:38:22,723 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:38:22,743 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:38:22,744 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22 WrapperNode [2022-11-25 23:38:22,744 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:38:22,745 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:38:22,745 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:38:22,745 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:38:22,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,761 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,780 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2022-11-25 23:38:22,781 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:38:22,782 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:38:22,782 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:38:22,782 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:38:22,792 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,793 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,794 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,795 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,798 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,802 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,803 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,804 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,805 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:38:22,806 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:38:22,807 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:38:22,807 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:38:22,808 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (1/1) ... [2022-11-25 23:38:22,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:38:22,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:22,848 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:38:22,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:38:22,907 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:38:22,907 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:38:22,908 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:38:22,908 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:38:22,982 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:38:22,985 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:38:23,133 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:38:23,160 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:38:23,160 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 23:38:23,163 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:38:23 BoogieIcfgContainer [2022-11-25 23:38:23,163 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:38:23,166 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:38:23,166 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:38:23,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:38:23,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:38:22" (1/3) ... [2022-11-25 23:38:23,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5be0074d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:38:23, skipping insertion in model container [2022-11-25 23:38:23,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:38:22" (2/3) ... [2022-11-25 23:38:23,172 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5be0074d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:38:23, skipping insertion in model container [2022-11-25 23:38:23,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:38:23" (3/3) ... [2022-11-25 23:38:23,174 INFO L112 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2022-11-25 23:38:23,197 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:38:23,197 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:38:23,287 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:38:23,294 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;@3e8c68d6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:38:23,295 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:38:23,315 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:23,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-25 23:38:23,323 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:23,323 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:23,324 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:23,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:23,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2022-11-25 23:38:23,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:23,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854416587] [2022-11-25 23:38:23,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:23,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:23,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:23,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:23,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:23,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854416587] [2022-11-25 23:38:23,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854416587] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:38:23,566 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:38:23,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:38:23,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196314235] [2022-11-25 23:38:23,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:38:23,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-25 23:38:23,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:23,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-25 23:38:23,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:38:23,615 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:23,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:23,647 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2022-11-25 23:38:23,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-25 23:38:23,653 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-25 23:38:23,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:23,662 INFO L225 Difference]: With dead ends: 27 [2022-11-25 23:38:23,662 INFO L226 Difference]: Without dead ends: 13 [2022-11-25 23:38:23,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:38:23,675 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:23,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:38:23,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-25 23:38:23,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-25 23:38:23,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:23,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-25 23:38:23,723 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-11-25 23:38:23,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:23,724 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-25 23:38:23,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:23,724 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-25 23:38:23,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-25 23:38:23,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:23,725 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:23,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:38:23,726 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:23,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:23,727 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2022-11-25 23:38:23,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:23,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428492060] [2022-11-25 23:38:23,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:23,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:23,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:24,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:24,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428492060] [2022-11-25 23:38:24,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [428492060] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:38:24,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:38:24,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:38:24,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104629135] [2022-11-25 23:38:24,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:38:24,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:38:24,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:24,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:38:24,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:38:24,027 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:24,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:24,077 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2022-11-25 23:38:24,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:38:24,078 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-25 23:38:24,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:24,079 INFO L225 Difference]: With dead ends: 18 [2022-11-25 23:38:24,079 INFO L226 Difference]: Without dead ends: 16 [2022-11-25 23:38:24,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:38:24,082 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 7 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:24,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:38:24,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-25 23:38:24,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-11-25 23:38:24,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:24,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-11-25 23:38:24,089 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2022-11-25 23:38:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:24,089 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-11-25 23:38:24,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:24,090 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-11-25 23:38:24,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 23:38:24,091 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:24,091 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:24,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:38:24,092 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:24,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:24,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2022-11-25 23:38:24,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:24,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794963933] [2022-11-25 23:38:24,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:24,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:24,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:24,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:24,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:24,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794963933] [2022-11-25 23:38:24,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794963933] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:38:24,391 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:38:24,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 23:38:24,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884802254] [2022-11-25 23:38:24,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:38:24,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:38:24,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:24,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:38:24,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:38:24,393 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:24,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:24,474 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-11-25 23:38:24,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:38:24,475 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-25 23:38:24,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:24,476 INFO L225 Difference]: With dead ends: 31 [2022-11-25 23:38:24,476 INFO L226 Difference]: Without dead ends: 20 [2022-11-25 23:38:24,477 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 [2022-11-25 23:38:24,479 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:24,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:24,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-25 23:38:24,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2022-11-25 23:38:24,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:24,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-25 23:38:24,486 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2022-11-25 23:38:24,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:24,486 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-25 23:38:24,487 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:24,487 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-25 23:38:24,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-25 23:38:24,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:24,488 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:24,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-25 23:38:24,489 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:24,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:24,490 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2022-11-25 23:38:24,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:24,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853044522] [2022-11-25 23:38:24,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:24,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:24,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:24,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:24,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:24,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853044522] [2022-11-25 23:38:24,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853044522] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:24,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020656730] [2022-11-25 23:38:24,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:24,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:24,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:24,679 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:24,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:38:24,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:24,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 23:38:24,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:24,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:24,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:25,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:25,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020656730] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:25,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369271424] [2022-11-25 23:38:25,097 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:25,101 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:25,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:25,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:25,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:25,593 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:26,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:26,074 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:26,074 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:26,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2022-11-25 23:38:26,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772438547] [2022-11-25 23:38:26,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:26,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-25 23:38:26,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:26,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-25 23:38:26,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:38:26,077 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:26,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:26,338 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-11-25 23:38:26,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:38:26,339 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-25 23:38:26,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:26,340 INFO L225 Difference]: With dead ends: 41 [2022-11-25 23:38:26,340 INFO L226 Difference]: Without dead ends: 30 [2022-11-25 23:38:26,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2022-11-25 23:38:26,342 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 26 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:26,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 41 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:26,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-25 23:38:26,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2022-11-25 23:38:26,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:26,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-25 23:38:26,349 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2022-11-25 23:38:26,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:26,349 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-25 23:38:26,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:26,350 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-25 23:38:26,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 23:38:26,351 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:26,351 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:26,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-25 23:38:26,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:26,557 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:26,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:26,557 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2022-11-25 23:38:26,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:26,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945256913] [2022-11-25 23:38:26,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:26,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:26,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:26,683 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:26,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:26,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945256913] [2022-11-25 23:38:26,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945256913] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:26,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252339371] [2022-11-25 23:38:26,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:26,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:26,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:26,686 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:26,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:38:26,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:38:26,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:26,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:38:26,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:26,883 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:26,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:26,954 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:26,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252339371] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:26,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363852231] [2022-11-25 23:38:26,959 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:26,960 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:26,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:26,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:26,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:27,194 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:27,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '552#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:27,588 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:27,589 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:27,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-25 23:38:27,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887880719] [2022-11-25 23:38:27,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:27,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-25 23:38:27,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:27,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-25 23:38:27,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2022-11-25 23:38:27,591 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:27,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:27,685 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2022-11-25 23:38:27,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:38:27,686 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-25 23:38:27,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:27,688 INFO L225 Difference]: With dead ends: 49 [2022-11-25 23:38:27,688 INFO L226 Difference]: Without dead ends: 34 [2022-11-25 23:38:27,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:38:27,689 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 21 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:27,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 47 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:38:27,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-25 23:38:27,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2022-11-25 23:38:27,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:27,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-11-25 23:38:27,696 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2022-11-25 23:38:27,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:27,697 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-11-25 23:38:27,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:27,697 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-11-25 23:38:27,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 23:38:27,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:27,698 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:27,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:27,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:27,904 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:27,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:27,905 INFO L85 PathProgramCache]: Analyzing trace with hash -955132283, now seen corresponding path program 3 times [2022-11-25 23:38:27,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:27,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280983873] [2022-11-25 23:38:27,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:27,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:27,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:28,067 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:28,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:28,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280983873] [2022-11-25 23:38:28,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280983873] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:28,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758472674] [2022-11-25 23:38:28,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:38:28,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:28,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:28,070 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:28,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:38:28,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:38:28,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:28,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:38:28,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:28,200 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:28,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:28,272 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:28,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758472674] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:28,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805627241] [2022-11-25 23:38:28,277 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:28,277 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:28,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:28,278 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:28,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:28,506 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:28,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '818#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:28,969 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:28,969 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:28,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2022-11-25 23:38:28,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742070340] [2022-11-25 23:38:28,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:28,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 23:38:28,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:28,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 23:38:28,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:38:28,972 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:29,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:29,134 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2022-11-25 23:38:29,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:38:29,135 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-25 23:38:29,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:29,136 INFO L225 Difference]: With dead ends: 42 [2022-11-25 23:38:29,136 INFO L226 Difference]: Without dead ends: 40 [2022-11-25 23:38:29,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=132, Invalid=468, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:38:29,137 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:29,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 60 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:29,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-25 23:38:29,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2022-11-25 23:38:29,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:29,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-11-25 23:38:29,151 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 24 [2022-11-25 23:38:29,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:29,152 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-11-25 23:38:29,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:29,152 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-11-25 23:38:29,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-25 23:38:29,154 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:29,155 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:29,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:29,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:29,363 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:29,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:29,364 INFO L85 PathProgramCache]: Analyzing trace with hash 204854123, now seen corresponding path program 4 times [2022-11-25 23:38:29,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:29,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072415858] [2022-11-25 23:38:29,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:29,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:29,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:29,597 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:29,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:29,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072415858] [2022-11-25 23:38:29,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072415858] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:29,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371940332] [2022-11-25 23:38:29,599 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:38:29,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:29,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:29,601 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:29,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:38:29,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:29,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 23:38:29,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:29,854 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:29,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:29,991 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:29,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371940332] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:29,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [56519754] [2022-11-25 23:38:29,994 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:29,995 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:29,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:29,995 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:29,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:30,150 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:30,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1148#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:30,648 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:30,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:30,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 17 [2022-11-25 23:38:30,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854314491] [2022-11-25 23:38:30,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:30,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-25 23:38:30,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:30,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-25 23:38:30,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=545, Unknown=0, NotChecked=0, Total=650 [2022-11-25 23:38:30,651 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:30,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:30,826 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2022-11-25 23:38:30,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:38:30,826 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-25 23:38:30,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:30,827 INFO L225 Difference]: With dead ends: 68 [2022-11-25 23:38:30,827 INFO L226 Difference]: Without dead ends: 47 [2022-11-25 23:38:30,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:38:30,829 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:30,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 88 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:30,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-25 23:38:30,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2022-11-25 23:38:30,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:30,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-25 23:38:30,837 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 32 [2022-11-25 23:38:30,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:30,837 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-25 23:38:30,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:30,837 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-25 23:38:30,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-25 23:38:30,838 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:30,839 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:30,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-25 23:38:31,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:31,045 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:31,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:31,046 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 5 times [2022-11-25 23:38:31,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:31,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479475136] [2022-11-25 23:38:31,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:31,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:31,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:31,271 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:31,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:31,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479475136] [2022-11-25 23:38:31,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479475136] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:31,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2091444504] [2022-11-25 23:38:31,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:31,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:31,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:31,275 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:31,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:38:31,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 23:38:31,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:31,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:38:31,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:31,543 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:31,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:31,674 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:31,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2091444504] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:31,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [271211064] [2022-11-25 23:38:31,678 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:31,679 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:31,679 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:31,679 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:31,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:31,867 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:32,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1528#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:32,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:32,388 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:32,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-25 23:38:32,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038585646] [2022-11-25 23:38:32,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:32,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 23:38:32,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:32,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 23:38:32,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2022-11-25 23:38:32,391 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:32,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:32,608 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-11-25 23:38:32,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 23:38:32,608 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-25 23:38:32,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:32,614 INFO L225 Difference]: With dead ends: 75 [2022-11-25 23:38:32,614 INFO L226 Difference]: Without dead ends: 52 [2022-11-25 23:38:32,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:38:32,616 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:32,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 103 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:32,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-25 23:38:32,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2022-11-25 23:38:32,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:32,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-11-25 23:38:32,625 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2022-11-25 23:38:32,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:32,625 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-11-25 23:38:32,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:32,626 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-11-25 23:38:32,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-25 23:38:32,627 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:32,627 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:32,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:32,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-25 23:38:32,834 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:32,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:32,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 6 times [2022-11-25 23:38:32,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:32,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925758303] [2022-11-25 23:38:32,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:32,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:32,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:33,057 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:33,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:33,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925758303] [2022-11-25 23:38:33,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925758303] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:33,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388316274] [2022-11-25 23:38:33,058 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:38:33,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:33,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:33,059 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:33,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:38:33,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:38:33,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:33,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-25 23:38:33,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:33,211 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:33,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:33,307 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:33,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388316274] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:33,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029994540] [2022-11-25 23:38:33,309 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:33,309 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:33,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:33,310 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:33,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:33,489 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:33,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1928#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:33,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:33,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:33,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2022-11-25 23:38:33,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492113561] [2022-11-25 23:38:33,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:33,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-25 23:38:33,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:33,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-25 23:38:33,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:38:33,863 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:34,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:34,027 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2022-11-25 23:38:34,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:38:34,028 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-25 23:38:34,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:34,028 INFO L225 Difference]: With dead ends: 54 [2022-11-25 23:38:34,029 INFO L226 Difference]: Without dead ends: 52 [2022-11-25 23:38:34,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2022-11-25 23:38:34,030 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 30 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:34,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 72 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:34,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-25 23:38:34,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2022-11-25 23:38:34,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:34,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-11-25 23:38:34,039 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2022-11-25 23:38:34,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:34,039 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-11-25 23:38:34,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:34,040 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-11-25 23:38:34,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-25 23:38:34,041 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:34,041 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:34,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:34,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-25 23:38:34,247 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:34,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:34,248 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 7 times [2022-11-25 23:38:34,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:34,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278033317] [2022-11-25 23:38:34,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:34,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:34,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:34,486 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:34,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:34,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278033317] [2022-11-25 23:38:34,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278033317] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:34,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654417064] [2022-11-25 23:38:34,487 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:38:34,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:34,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:34,488 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:34,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:38:34,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:34,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 23:38:34,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:34,763 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 70 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:34,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:34,906 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 70 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:34,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654417064] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:34,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163998108] [2022-11-25 23:38:34,913 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:34,913 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:34,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:34,913 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:34,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:35,079 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:35,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2376#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:35,574 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:35,575 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:35,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2022-11-25 23:38:35,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281501386] [2022-11-25 23:38:35,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:35,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 23:38:35,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:35,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 23:38:35,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=829, Unknown=0, NotChecked=0, Total=992 [2022-11-25 23:38:35,577 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:35,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:35,803 INFO L93 Difference]: Finished difference Result 94 states and 103 transitions. [2022-11-25 23:38:35,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:38:35,804 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-25 23:38:35,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:35,805 INFO L225 Difference]: With dead ends: 94 [2022-11-25 23:38:35,805 INFO L226 Difference]: Without dead ends: 65 [2022-11-25 23:38:35,806 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 105 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=249, Invalid=1157, Unknown=0, NotChecked=0, Total=1406 [2022-11-25 23:38:35,807 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 42 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:35,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 105 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:35,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-25 23:38:35,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 47. [2022-11-25 23:38:35,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:35,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-11-25 23:38:35,816 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 44 [2022-11-25 23:38:35,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:35,816 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-11-25 23:38:35,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:35,817 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-11-25 23:38:35,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-25 23:38:35,818 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:35,818 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:35,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:36,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:38:36,026 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:36,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:36,026 INFO L85 PathProgramCache]: Analyzing trace with hash 1692798912, now seen corresponding path program 8 times [2022-11-25 23:38:36,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:36,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948887968] [2022-11-25 23:38:36,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:36,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:36,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:36,347 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 57 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:36,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:36,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948887968] [2022-11-25 23:38:36,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948887968] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:36,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483098726] [2022-11-25 23:38:36,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:36,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:36,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:36,351 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:36,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:38:36,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 23:38:36,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:36,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-25 23:38:36,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:36,749 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 72 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:36,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:36,961 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 72 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:36,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483098726] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:36,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [297779147] [2022-11-25 23:38:36,963 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:36,964 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:36,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:36,964 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:36,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:37,135 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:37,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2894#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:37,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:37,687 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:37,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-25 23:38:37,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317317125] [2022-11-25 23:38:37,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:37,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 23:38:37,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:37,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 23:38:37,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2022-11-25 23:38:37,690 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:37,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:37,967 INFO L93 Difference]: Finished difference Result 101 states and 111 transitions. [2022-11-25 23:38:37,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:38:37,967 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-11-25 23:38:37,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:37,968 INFO L225 Difference]: With dead ends: 101 [2022-11-25 23:38:37,968 INFO L226 Difference]: Without dead ends: 70 [2022-11-25 23:38:37,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 108 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=303, Invalid=1337, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 23:38:37,970 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 55 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:37,971 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 115 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:37,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-25 23:38:37,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2022-11-25 23:38:37,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:37,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-25 23:38:37,979 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 46 [2022-11-25 23:38:37,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:37,980 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-25 23:38:37,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:37,980 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-25 23:38:37,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-25 23:38:37,981 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:37,981 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:37,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:38,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:38,188 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:38,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:38,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 9 times [2022-11-25 23:38:38,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:38,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240123036] [2022-11-25 23:38:38,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:38,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:38,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:38,426 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:38,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:38,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240123036] [2022-11-25 23:38:38,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240123036] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:38,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236735691] [2022-11-25 23:38:38,427 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:38:38,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:38,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:38,429 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:38,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:38:38,514 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:38:38,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:38,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 23:38:38,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:38,640 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:38,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:38,829 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:38,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236735691] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:38,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865469184] [2022-11-25 23:38:38,831 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:38,832 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:38,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:38,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:38,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:39,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:39,475 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3428#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:39,475 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:39,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:39,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2022-11-25 23:38:39,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606337439] [2022-11-25 23:38:39,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:39,477 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:38:39,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:39,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:38:39,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:38:39,478 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:39,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:39,707 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2022-11-25 23:38:39,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 23:38:39,708 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-25 23:38:39,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:39,708 INFO L225 Difference]: With dead ends: 66 [2022-11-25 23:38:39,709 INFO L226 Difference]: Without dead ends: 64 [2022-11-25 23:38:39,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 12 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=242, Invalid=814, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:38:39,710 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 39 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:39,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 103 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:39,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-25 23:38:39,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2022-11-25 23:38:39,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:39,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-11-25 23:38:39,721 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2022-11-25 23:38:39,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:39,721 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-11-25 23:38:39,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:39,721 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-11-25 23:38:39,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-25 23:38:39,722 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:39,723 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:39,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:39,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:39,927 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:39,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:39,927 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 10 times [2022-11-25 23:38:39,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:39,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225651559] [2022-11-25 23:38:39,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:39,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:39,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:40,341 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:40,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:40,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225651559] [2022-11-25 23:38:40,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225651559] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:40,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762013827] [2022-11-25 23:38:40,342 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:38:40,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:40,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:40,344 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:40,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:38:40,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:40,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:38:40,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:40,829 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 126 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:40,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:41,071 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 126 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:41,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762013827] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:41,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919289623] [2022-11-25 23:38:41,074 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:41,074 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:41,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:41,075 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:41,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:41,230 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:41,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3994#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:41,769 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:41,769 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:41,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 29 [2022-11-25 23:38:41,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914781391] [2022-11-25 23:38:41,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:41,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-25 23:38:41,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:41,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-25 23:38:41,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1169, Unknown=0, NotChecked=0, Total=1406 [2022-11-25 23:38:41,772 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:42,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:42,074 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2022-11-25 23:38:42,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:38:42,074 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-25 23:38:42,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:42,075 INFO L225 Difference]: With dead ends: 120 [2022-11-25 23:38:42,075 INFO L226 Difference]: Without dead ends: 83 [2022-11-25 23:38:42,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 135 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=383, Invalid=1687, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:38:42,077 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 55 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:42,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 138 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:42,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-25 23:38:42,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 59. [2022-11-25 23:38:42,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:42,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-11-25 23:38:42,087 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 56 [2022-11-25 23:38:42,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:42,087 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-11-25 23:38:42,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:42,088 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-11-25 23:38:42,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 23:38:42,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:42,089 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:42,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:42,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 23:38:42,296 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:42,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:42,296 INFO L85 PathProgramCache]: Analyzing trace with hash -755696720, now seen corresponding path program 11 times [2022-11-25 23:38:42,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:42,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419296385] [2022-11-25 23:38:42,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:42,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:42,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:42,779 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 107 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:42,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:42,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419296385] [2022-11-25 23:38:42,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419296385] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:42,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403046957] [2022-11-25 23:38:42,780 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:42,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:42,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:42,782 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:42,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:38:42,879 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-25 23:38:42,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:42,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 23:38:42,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:43,318 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 128 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:43,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:43,610 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 128 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:43,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403046957] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:43,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663441620] [2022-11-25 23:38:43,613 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:43,613 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:43,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:43,614 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:43,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:43,760 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:44,314 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4650#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:44,314 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:44,314 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:44,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-25 23:38:44,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840618718] [2022-11-25 23:38:44,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:44,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 23:38:44,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:44,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 23:38:44,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1291, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:38:44,316 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:44,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:44,687 INFO L93 Difference]: Finished difference Result 127 states and 139 transitions. [2022-11-25 23:38:44,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 23:38:44,688 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-25 23:38:44,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:44,689 INFO L225 Difference]: With dead ends: 127 [2022-11-25 23:38:44,690 INFO L226 Difference]: Without dead ends: 88 [2022-11-25 23:38:44,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 138 SyntacticMatches, 16 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=451, Invalid=1901, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:38:44,693 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 95 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:44,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 155 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:38:44,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-25 23:38:44,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2022-11-25 23:38:44,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:44,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-11-25 23:38:44,734 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 58 [2022-11-25 23:38:44,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:44,734 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-11-25 23:38:44,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:44,735 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-11-25 23:38:44,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-25 23:38:44,740 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:44,740 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:44,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:44,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 23:38:44,952 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:44,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:44,953 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 12 times [2022-11-25 23:38:44,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:44,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131391229] [2022-11-25 23:38:44,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:44,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:44,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:45,330 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:45,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:45,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131391229] [2022-11-25 23:38:45,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131391229] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:45,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193686477] [2022-11-25 23:38:45,334 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:38:45,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:45,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:45,335 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:45,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:38:45,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:38:45,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:45,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:38:45,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:45,532 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:45,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:45,748 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:45,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193686477] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:45,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365393067] [2022-11-25 23:38:45,752 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:45,753 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:45,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:45,753 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:45,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:45,921 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:46,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:46,321 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:46,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:46,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2022-11-25 23:38:46,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838371360] [2022-11-25 23:38:46,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:46,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:38:46,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:46,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:38:46,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:38:46,324 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:46,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:46,563 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2022-11-25 23:38:46,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-25 23:38:46,563 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-25 23:38:46,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:46,564 INFO L225 Difference]: With dead ends: 78 [2022-11-25 23:38:46,564 INFO L226 Difference]: Without dead ends: 76 [2022-11-25 23:38:46,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 159 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=315, Invalid=1017, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 23:38:46,566 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 42 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:46,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 99 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:46,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-25 23:38:46,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2022-11-25 23:38:46,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:46,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-11-25 23:38:46,576 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2022-11-25 23:38:46,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:46,576 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-11-25 23:38:46,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:46,576 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-11-25 23:38:46,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-25 23:38:46,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:46,578 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:46,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:46,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 23:38:46,784 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:46,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:46,785 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 13 times [2022-11-25 23:38:46,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:46,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320845871] [2022-11-25 23:38:46,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:46,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:46,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:47,290 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:47,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:47,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320845871] [2022-11-25 23:38:47,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320845871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:47,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846316401] [2022-11-25 23:38:47,291 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:38:47,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:47,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:47,293 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:47,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:38:47,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:47,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:38:47,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:47,890 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:47,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:48,215 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:48,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1846316401] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:48,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [859704826] [2022-11-25 23:38:48,217 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:48,218 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:48,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:48,218 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:48,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:48,352 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:48,892 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6002#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:48,892 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:48,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:48,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2022-11-25 23:38:48,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853714963] [2022-11-25 23:38:48,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:48,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 23:38:48,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:48,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 23:38:48,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2022-11-25 23:38:48,895 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:49,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:49,195 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2022-11-25 23:38:49,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 23:38:49,195 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-25 23:38:49,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:49,196 INFO L225 Difference]: With dead ends: 146 [2022-11-25 23:38:49,196 INFO L226 Difference]: Without dead ends: 101 [2022-11-25 23:38:49,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 23:38:49,209 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:49,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 168 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:49,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-25 23:38:49,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2022-11-25 23:38:49,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:49,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-11-25 23:38:49,227 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2022-11-25 23:38:49,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:49,228 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-11-25 23:38:49,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:49,228 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-11-25 23:38:49,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-25 23:38:49,229 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:49,229 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:49,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:49,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:38:49,430 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:49,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:49,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 14 times [2022-11-25 23:38:49,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:49,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731935178] [2022-11-25 23:38:49,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:49,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:49,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:49,883 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:49,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:49,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731935178] [2022-11-25 23:38:49,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731935178] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:49,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106909281] [2022-11-25 23:38:49,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:49,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:49,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:49,885 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:49,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:38:49,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-25 23:38:49,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:49,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:38:49,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:50,383 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 200 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:50,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:50,681 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 200 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:50,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106909281] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:50,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2003057722] [2022-11-25 23:38:50,683 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:50,683 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:50,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:50,683 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:50,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:50,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:51,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6796#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:51,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:51,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:51,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-25 23:38:51,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324314854] [2022-11-25 23:38:51,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:51,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-25 23:38:51,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:51,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-25 23:38:51,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1705, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:38:51,311 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:51,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:51,665 INFO L93 Difference]: Finished difference Result 153 states and 167 transitions. [2022-11-25 23:38:51,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-25 23:38:51,665 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-11-25 23:38:51,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:51,666 INFO L225 Difference]: With dead ends: 153 [2022-11-25 23:38:51,666 INFO L226 Difference]: Without dead ends: 106 [2022-11-25 23:38:51,667 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 168 SyntacticMatches, 20 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1216 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:38:51,667 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 87 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:51,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 219 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:38:51,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-25 23:38:51,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 73. [2022-11-25 23:38:51,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:51,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-11-25 23:38:51,674 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 70 [2022-11-25 23:38:51,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:51,674 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-11-25 23:38:51,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:51,674 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-11-25 23:38:51,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-25 23:38:51,675 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:51,675 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:51,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:51,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 23:38:51,875 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:51,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:51,876 INFO L85 PathProgramCache]: Analyzing trace with hash 893986373, now seen corresponding path program 15 times [2022-11-25 23:38:51,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:51,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153583005] [2022-11-25 23:38:51,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:51,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:51,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:52,305 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 110 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:52,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:52,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153583005] [2022-11-25 23:38:52,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153583005] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:52,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034568719] [2022-11-25 23:38:52,306 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:38:52,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:52,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:52,308 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:52,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:38:52,389 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:38:52,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:52,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-25 23:38:52,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:52,523 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 132 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:52,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:52,759 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 132 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:52,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034568719] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:52,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489866024] [2022-11-25 23:38:52,761 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:52,762 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:52,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:52,762 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:52,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:52,878 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:53,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:53,291 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:53,291 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:53,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 17 [2022-11-25 23:38:53,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517451882] [2022-11-25 23:38:53,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:53,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 23:38:53,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:53,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 23:38:53,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2022-11-25 23:38:53,294 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:53,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:53,649 INFO L93 Difference]: Finished difference Result 90 states and 93 transitions. [2022-11-25 23:38:53,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-25 23:38:53,649 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2022-11-25 23:38:53,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:53,650 INFO L225 Difference]: With dead ends: 90 [2022-11-25 23:38:53,650 INFO L226 Difference]: Without dead ends: 88 [2022-11-25 23:38:53,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 193 SyntacticMatches, 20 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=400, Invalid=1240, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 23:38:53,652 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 87 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:53,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 119 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:38:53,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-25 23:38:53,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 81. [2022-11-25 23:38:53,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:53,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-11-25 23:38:53,662 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 72 [2022-11-25 23:38:53,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:53,662 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-11-25 23:38:53,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:53,663 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-11-25 23:38:53,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-25 23:38:53,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:53,663 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:53,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:53,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 23:38:53,864 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:53,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:53,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1526635733, now seen corresponding path program 16 times [2022-11-25 23:38:53,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:53,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638822523] [2022-11-25 23:38:53,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:53,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:53,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:54,617 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 255 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:54,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:54,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638822523] [2022-11-25 23:38:54,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638822523] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:54,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735280807] [2022-11-25 23:38:54,618 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:38:54,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:54,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:54,627 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:54,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:38:54,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:54,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:38:54,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:55,305 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 286 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:55,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:55,754 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 286 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:38:55,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735280807] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:55,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [760667505] [2022-11-25 23:38:55,756 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:55,756 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:55,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:55,756 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:55,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:55,921 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:56,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8400#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:56,547 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:56,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:56,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 41 [2022-11-25 23:38:56,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135305301] [2022-11-25 23:38:56,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:56,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-25 23:38:56,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:56,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-25 23:38:56,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2017, Unknown=0, NotChecked=0, Total=2450 [2022-11-25 23:38:56,551 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:57,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:38:57,072 INFO L93 Difference]: Finished difference Result 172 states and 187 transitions. [2022-11-25 23:38:57,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-25 23:38:57,072 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2022-11-25 23:38:57,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:38:57,074 INFO L225 Difference]: With dead ends: 172 [2022-11-25 23:38:57,074 INFO L226 Difference]: Without dead ends: 119 [2022-11-25 23:38:57,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 195 SyntacticMatches, 22 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=747, Invalid=3035, Unknown=0, NotChecked=0, Total=3782 [2022-11-25 23:38:57,076 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 85 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:38:57,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 278 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:38:57,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-25 23:38:57,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 83. [2022-11-25 23:38:57,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:57,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-11-25 23:38:57,085 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 80 [2022-11-25 23:38:57,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:38:57,086 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-11-25 23:38:57,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:38:57,086 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-11-25 23:38:57,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-25 23:38:57,087 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:38:57,087 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:38:57,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 23:38:57,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:57,291 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:38:57,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:38:57,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 17 times [2022-11-25 23:38:57,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:38:57,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157415693] [2022-11-25 23:38:57,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:38:57,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:38:57,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:38:57,964 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:57,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:38:57,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157415693] [2022-11-25 23:38:57,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157415693] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:38:57,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554296208] [2022-11-25 23:38:57,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:38:57,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:38:57,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:38:57,966 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:38:57,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 23:38:58,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-25 23:38:58,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:38:58,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-25 23:38:58,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:38:58,640 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:58,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:38:59,066 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:38:59,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554296208] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:38:59,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306269697] [2022-11-25 23:38:59,068 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:38:59,068 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:38:59,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:38:59,068 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:38:59,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:38:59,217 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:38:59,825 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9332#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:38:59,826 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:38:59,826 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:38:59,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-25 23:38:59,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349398642] [2022-11-25 23:38:59,826 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:38:59,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-25 23:38:59,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:38:59,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-25 23:38:59,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 23:38:59,830 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:00,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:00,283 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2022-11-25 23:39:00,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 23:39:00,283 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-11-25 23:39:00,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:00,284 INFO L225 Difference]: With dead ends: 179 [2022-11-25 23:39:00,285 INFO L226 Difference]: Without dead ends: 124 [2022-11-25 23:39:00,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2022-11-25 23:39:00,287 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:00,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 274 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:39:00,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-25 23:39:00,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2022-11-25 23:39:00,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:00,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-11-25 23:39:00,299 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2022-11-25 23:39:00,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:00,299 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-11-25 23:39:00,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:00,300 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-11-25 23:39:00,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-25 23:39:00,301 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:00,301 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:00,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:00,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:00,508 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:00,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:00,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 18 times [2022-11-25 23:39:00,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:00,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299907472] [2022-11-25 23:39:00,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:00,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:00,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:00,996 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:00,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:00,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299907472] [2022-11-25 23:39:00,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299907472] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:00,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602005193] [2022-11-25 23:39:00,997 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:39:00,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:00,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:00,998 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:01,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 23:39:01,104 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:39:01,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:01,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:39:01,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:01,249 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:01,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:01,584 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:01,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602005193] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:01,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2054047883] [2022-11-25 23:39:01,586 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:01,586 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:01,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:01,587 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:01,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:01,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:02,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10268#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:02,093 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:02,093 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:02,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2022-11-25 23:39:02,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716580177] [2022-11-25 23:39:02,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:02,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:39:02,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:02,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:39:02,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=624, Unknown=0, NotChecked=0, Total=812 [2022-11-25 23:39:02,095 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:02,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:02,434 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2022-11-25 23:39:02,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 23:39:02,435 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-11-25 23:39:02,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:02,437 INFO L225 Difference]: With dead ends: 102 [2022-11-25 23:39:02,437 INFO L226 Difference]: Without dead ends: 100 [2022-11-25 23:39:02,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 227 SyntacticMatches, 24 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=497, Invalid=1483, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:39:02,440 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 56 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:02,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 152 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:39:02,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-11-25 23:39:02,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2022-11-25 23:39:02,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:02,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-11-25 23:39:02,454 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2022-11-25 23:39:02,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:02,455 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-11-25 23:39:02,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:02,455 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-11-25 23:39:02,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-25 23:39:02,456 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:02,456 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:02,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-25 23:39:02,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:02,667 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:02,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:02,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 19 times [2022-11-25 23:39:02,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:02,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289186945] [2022-11-25 23:39:02,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:02,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:02,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:03,482 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:03,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:03,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289186945] [2022-11-25 23:39:03,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289186945] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:03,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675953387] [2022-11-25 23:39:03,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:39:03,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:03,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:03,487 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:03,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 23:39:03,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:03,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-25 23:39:03,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:04,278 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 390 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:04,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:04,771 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 390 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:04,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675953387] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:04,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1748465334] [2022-11-25 23:39:04,773 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:04,774 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:04,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:04,774 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:04,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:04,909 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:05,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11188#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:05,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:05,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:05,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 47 [2022-11-25 23:39:05,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574609161] [2022-11-25 23:39:05,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:05,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-25 23:39:05,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:05,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-25 23:39:05,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=2525, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 23:39:05,491 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:05,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:05,955 INFO L93 Difference]: Finished difference Result 198 states and 215 transitions. [2022-11-25 23:39:05,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-25 23:39:05,955 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-11-25 23:39:05,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:05,956 INFO L225 Difference]: With dead ends: 198 [2022-11-25 23:39:05,957 INFO L226 Difference]: Without dead ends: 137 [2022-11-25 23:39:05,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 225 SyntacticMatches, 26 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1865 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=977, Invalid=3853, Unknown=0, NotChecked=0, Total=4830 [2022-11-25 23:39:05,959 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 116 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:05,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 249 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:39:05,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-11-25 23:39:05,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 95. [2022-11-25 23:39:05,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:05,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-11-25 23:39:05,972 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 92 [2022-11-25 23:39:05,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:05,972 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-11-25 23:39:05,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:05,973 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-11-25 23:39:05,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-25 23:39:05,973 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:05,974 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:05,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:06,185 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-25 23:39:06,185 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:06,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:06,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1907467648, now seen corresponding path program 20 times [2022-11-25 23:39:06,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:06,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664299711] [2022-11-25 23:39:06,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:06,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:06,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:06,977 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 353 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:06,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:06,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664299711] [2022-11-25 23:39:06,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664299711] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:06,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794950989] [2022-11-25 23:39:06,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:39:06,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:06,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:06,979 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:06,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 23:39:07,108 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-25 23:39:07,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:07,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 23:39:07,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:07,789 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 392 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:07,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:08,281 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 392 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:08,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794950989] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:08,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [416612158] [2022-11-25 23:39:08,284 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:08,284 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:08,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:08,285 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:08,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:08,431 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:08,967 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12258#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:08,967 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:08,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:08,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-25 23:39:08,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75540927] [2022-11-25 23:39:08,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:08,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-25 23:39:08,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:08,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-25 23:39:08,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=2701, Unknown=0, NotChecked=0, Total=3306 [2022-11-25 23:39:08,970 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:09,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:09,489 INFO L93 Difference]: Finished difference Result 205 states and 223 transitions. [2022-11-25 23:39:09,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-25 23:39:09,489 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-11-25 23:39:09,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:09,490 INFO L225 Difference]: With dead ends: 205 [2022-11-25 23:39:09,490 INFO L226 Difference]: Without dead ends: 142 [2022-11-25 23:39:09,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 228 SyntacticMatches, 28 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1087, Invalid=4169, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 23:39:09,492 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 146 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:09,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 300 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:39:09,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-25 23:39:09,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2022-11-25 23:39:09,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:09,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-11-25 23:39:09,504 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 94 [2022-11-25 23:39:09,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:09,504 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-11-25 23:39:09,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:09,505 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-11-25 23:39:09,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-25 23:39:09,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:09,506 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:09,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:09,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:09,706 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:09,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:09,706 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 21 times [2022-11-25 23:39:09,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:09,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868695020] [2022-11-25 23:39:09,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:09,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:09,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:10,288 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:10,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:10,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868695020] [2022-11-25 23:39:10,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868695020] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:10,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620413790] [2022-11-25 23:39:10,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:39:10,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:10,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:10,291 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:10,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 23:39:10,387 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:39:10,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:10,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-25 23:39:10,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:10,534 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:10,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:10,895 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:10,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620413790] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:10,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1362898573] [2022-11-25 23:39:10,897 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:10,897 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:10,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:10,897 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:10,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:10,998 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:11,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:11,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:11,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:11,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2022-11-25 23:39:11,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405817378] [2022-11-25 23:39:11,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:11,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-25 23:39:11,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:11,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-25 23:39:11,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=707, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:39:11,377 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:11,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:11,714 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2022-11-25 23:39:11,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-25 23:39:11,715 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2022-11-25 23:39:11,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:11,715 INFO L225 Difference]: With dead ends: 114 [2022-11-25 23:39:11,716 INFO L226 Difference]: Without dead ends: 112 [2022-11-25 23:39:11,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 956 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=606, Invalid=1746, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:39:11,717 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 110 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:11,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 127 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:39:11,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-25 23:39:11,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2022-11-25 23:39:11,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:11,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-11-25 23:39:11,729 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2022-11-25 23:39:11,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:11,730 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-11-25 23:39:11,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:11,730 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-11-25 23:39:11,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-25 23:39:11,731 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:11,731 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:11,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:11,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-25 23:39:11,937 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:11,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:11,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 22 times [2022-11-25 23:39:11,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:11,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391160140] [2022-11-25 23:39:11,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:11,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:11,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:13,013 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:13,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:13,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391160140] [2022-11-25 23:39:13,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391160140] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:13,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939105492] [2022-11-25 23:39:13,013 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:39:13,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:13,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:13,019 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:13,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-25 23:39:13,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:13,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-25 23:39:13,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:14,036 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 510 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:14,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:14,690 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 510 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:14,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939105492] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:14,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878589755] [2022-11-25 23:39:14,695 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:14,695 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:14,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:14,696 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:14,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:14,819 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:15,505 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14366#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:15,505 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:15,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:15,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 53 [2022-11-25 23:39:15,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975360052] [2022-11-25 23:39:15,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:15,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-25 23:39:15,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:15,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-25 23:39:15,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=693, Invalid=3089, Unknown=0, NotChecked=0, Total=3782 [2022-11-25 23:39:15,508 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:16,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:16,168 INFO L93 Difference]: Finished difference Result 224 states and 243 transitions. [2022-11-25 23:39:16,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 23:39:16,168 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2022-11-25 23:39:16,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:16,169 INFO L225 Difference]: With dead ends: 224 [2022-11-25 23:39:16,170 INFO L226 Difference]: Without dead ends: 155 [2022-11-25 23:39:16,171 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 255 SyntacticMatches, 30 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2323 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1239, Invalid=4767, Unknown=0, NotChecked=0, Total=6006 [2022-11-25 23:39:16,171 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 128 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 363 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:16,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 363 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:39:16,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-25 23:39:16,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 107. [2022-11-25 23:39:16,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:16,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-11-25 23:39:16,184 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 104 [2022-11-25 23:39:16,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:16,184 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-11-25 23:39:16,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:16,185 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-11-25 23:39:16,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-25 23:39:16,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:16,186 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:16,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:16,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-25 23:39:16,391 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:16,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:16,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1949488496, now seen corresponding path program 23 times [2022-11-25 23:39:16,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:16,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937112714] [2022-11-25 23:39:16,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:16,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:16,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:17,356 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 467 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:17,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:17,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937112714] [2022-11-25 23:39:17,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937112714] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:17,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858025158] [2022-11-25 23:39:17,356 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:39:17,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:17,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:17,358 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:17,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-25 23:39:17,496 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-25 23:39:17,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:17,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-25 23:39:17,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:18,374 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 512 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:18,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:18,937 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 512 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:18,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858025158] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:18,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934726616] [2022-11-25 23:39:18,939 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:18,939 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:18,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:18,939 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:18,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:19,050 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:19,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15574#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:19,632 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:19,632 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:19,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-11-25 23:39:19,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360973569] [2022-11-25 23:39:19,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:19,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-25 23:39:19,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:19,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-25 23:39:19,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=749, Invalid=3283, Unknown=0, NotChecked=0, Total=4032 [2022-11-25 23:39:19,634 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:20,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:20,209 INFO L93 Difference]: Finished difference Result 231 states and 251 transitions. [2022-11-25 23:39:20,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-25 23:39:20,209 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2022-11-25 23:39:20,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:20,210 INFO L225 Difference]: With dead ends: 231 [2022-11-25 23:39:20,210 INFO L226 Difference]: Without dead ends: 160 [2022-11-25 23:39:20,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 258 SyntacticMatches, 32 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2494 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1363, Invalid=5117, Unknown=0, NotChecked=0, Total=6480 [2022-11-25 23:39:20,212 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 147 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:20,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 309 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:39:20,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-25 23:39:20,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2022-11-25 23:39:20,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:20,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-11-25 23:39:20,225 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 106 [2022-11-25 23:39:20,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:20,226 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-11-25 23:39:20,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:20,226 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-11-25 23:39:20,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-25 23:39:20,227 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:20,227 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:20,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:20,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 23:39:20,433 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:20,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:20,433 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 24 times [2022-11-25 23:39:20,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:20,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365798693] [2022-11-25 23:39:20,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:20,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:20,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:21,156 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:21,156 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:21,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365798693] [2022-11-25 23:39:21,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365798693] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:21,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759145697] [2022-11-25 23:39:21,157 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:39:21,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:21,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:21,158 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:21,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-25 23:39:21,261 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:39:21,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:21,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 23:39:21,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:21,440 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:21,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:21,898 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:21,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759145697] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:21,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602051062] [2022-11-25 23:39:21,899 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:21,899 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:21,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:21,899 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:21,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:22,023 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:22,421 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16778#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:22,421 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:22,421 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:22,422 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2022-11-25 23:39:22,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502790832] [2022-11-25 23:39:22,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:22,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 23:39:22,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:22,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 23:39:22,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=794, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:39:22,423 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:22,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:22,796 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2022-11-25 23:39:22,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-25 23:39:22,796 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2022-11-25 23:39:22,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:22,797 INFO L225 Difference]: With dead ends: 126 [2022-11-25 23:39:22,797 INFO L226 Difference]: Without dead ends: 124 [2022-11-25 23:39:22,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 295 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=727, Invalid=2029, Unknown=0, NotChecked=0, Total=2756 [2022-11-25 23:39:22,798 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 67 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:22,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 180 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:39:22,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-25 23:39:22,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2022-11-25 23:39:22,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:22,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2022-11-25 23:39:22,811 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2022-11-25 23:39:22,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:22,812 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2022-11-25 23:39:22,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:22,812 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2022-11-25 23:39:22,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-25 23:39:22,813 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:22,813 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:22,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:23,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-25 23:39:23,014 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:23,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:23,015 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 25 times [2022-11-25 23:39:23,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:23,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884476026] [2022-11-25 23:39:23,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:23,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:23,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:24,019 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:24,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:24,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884476026] [2022-11-25 23:39:24,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884476026] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:24,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701382736] [2022-11-25 23:39:24,020 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:39:24,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:24,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:24,021 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:24,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-25 23:39:24,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:24,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-25 23:39:24,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:24,975 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:24,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:25,567 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:25,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701382736] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:25,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809321423] [2022-11-25 23:39:25,569 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:25,569 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:25,569 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:25,569 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:25,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:25,681 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:26,305 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17934#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:26,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:26,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:26,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2022-11-25 23:39:26,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662235041] [2022-11-25 23:39:26,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:26,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-25 23:39:26,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:26,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-25 23:39:26,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 23:39:26,307 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:26,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:26,991 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2022-11-25 23:39:26,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-25 23:39:26,991 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2022-11-25 23:39:26,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:26,992 INFO L225 Difference]: With dead ends: 250 [2022-11-25 23:39:26,992 INFO L226 Difference]: Without dead ends: 173 [2022-11-25 23:39:26,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 285 SyntacticMatches, 34 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2829 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2022-11-25 23:39:26,993 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 134 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:26,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 425 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:39:26,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-25 23:39:27,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2022-11-25 23:39:27,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:27,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2022-11-25 23:39:27,009 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2022-11-25 23:39:27,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:27,009 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2022-11-25 23:39:27,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:27,009 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2022-11-25 23:39:27,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-25 23:39:27,010 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:27,010 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:27,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:27,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-25 23:39:27,211 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:27,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:27,211 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 26 times [2022-11-25 23:39:27,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:27,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993347482] [2022-11-25 23:39:27,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:27,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:27,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:28,334 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:28,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:28,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993347482] [2022-11-25 23:39:28,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993347482] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:28,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390965094] [2022-11-25 23:39:28,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:39:28,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:28,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:28,336 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:28,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-25 23:39:28,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-25 23:39:28,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:28,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-25 23:39:28,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:29,447 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:29,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:30,139 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:30,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390965094] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:30,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628147439] [2022-11-25 23:39:30,143 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:30,143 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:30,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:30,143 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:30,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:30,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:30,952 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19280#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:30,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:30,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:30,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-11-25 23:39:30,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607430629] [2022-11-25 23:39:30,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:30,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-25 23:39:30,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:30,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-25 23:39:30,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=3921, Unknown=0, NotChecked=0, Total=4830 [2022-11-25 23:39:30,955 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:31,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:31,819 INFO L93 Difference]: Finished difference Result 257 states and 279 transitions. [2022-11-25 23:39:31,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-25 23:39:31,819 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2022-11-25 23:39:31,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:31,820 INFO L225 Difference]: With dead ends: 257 [2022-11-25 23:39:31,820 INFO L226 Difference]: Without dead ends: 178 [2022-11-25 23:39:31,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 288 SyntacticMatches, 36 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3016 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1671, Invalid=6161, Unknown=0, NotChecked=0, Total=7832 [2022-11-25 23:39:31,822 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 130 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:31,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 414 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:39:31,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-11-25 23:39:31,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2022-11-25 23:39:31,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:31,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2022-11-25 23:39:31,853 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 118 [2022-11-25 23:39:31,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:31,853 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2022-11-25 23:39:31,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:31,853 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2022-11-25 23:39:31,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-11-25 23:39:31,854 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:31,858 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:31,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:32,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-25 23:39:32,066 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:32,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:32,066 INFO L85 PathProgramCache]: Analyzing trace with hash 600933893, now seen corresponding path program 27 times [2022-11-25 23:39:32,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:32,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736948635] [2022-11-25 23:39:32,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:32,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:32,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:32,913 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 342 proven. 686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:32,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:32,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736948635] [2022-11-25 23:39:32,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736948635] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:32,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676854870] [2022-11-25 23:39:32,913 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:39:32,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:32,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:32,915 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:32,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-25 23:39:33,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:39:33,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:33,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-25 23:39:33,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:33,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:33,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:33,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:33,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676854870] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:33,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [319266012] [2022-11-25 23:39:33,869 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:33,869 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:33,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:33,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:33,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:33,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:34,394 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20618#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:34,394 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:34,394 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:34,394 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 25 [2022-11-25 23:39:34,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124539463] [2022-11-25 23:39:34,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:34,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 23:39:34,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:34,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 23:39:34,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=885, Unknown=0, NotChecked=0, Total=1190 [2022-11-25 23:39:34,399 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:34,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:34,807 INFO L93 Difference]: Finished difference Result 138 states and 141 transitions. [2022-11-25 23:39:34,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-25 23:39:34,811 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2022-11-25 23:39:34,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:34,812 INFO L225 Difference]: With dead ends: 138 [2022-11-25 23:39:34,812 INFO L226 Difference]: Without dead ends: 136 [2022-11-25 23:39:34,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 329 SyntacticMatches, 36 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=860, Invalid=2332, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:39:34,813 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 132 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:34,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 153 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:39:34,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-25 23:39:34,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2022-11-25 23:39:34,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:34,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2022-11-25 23:39:34,838 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 120 [2022-11-25 23:39:34,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:34,838 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2022-11-25 23:39:34,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:34,839 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2022-11-25 23:39:34,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-25 23:39:34,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:34,845 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:34,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:35,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:35,051 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:35,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:35,051 INFO L85 PathProgramCache]: Analyzing trace with hash 604898027, now seen corresponding path program 28 times [2022-11-25 23:39:35,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:35,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586583054] [2022-11-25 23:39:35,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:35,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:35,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:36,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 743 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:36,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:36,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586583054] [2022-11-25 23:39:36,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586583054] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:36,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290715416] [2022-11-25 23:39:36,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:39:36,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:36,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:36,163 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:36,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-25 23:39:36,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:36,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-25 23:39:36,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:37,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:37,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:38,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:38,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290715416] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:38,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715819435] [2022-11-25 23:39:38,004 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:38,005 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:38,005 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:38,005 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:38,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:38,116 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:38,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21892#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:38,857 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:38,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:38,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2022-11-25 23:39:38,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082661174] [2022-11-25 23:39:38,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:38,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-25 23:39:38,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:38,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-25 23:39:38,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4385, Unknown=0, NotChecked=0, Total=5402 [2022-11-25 23:39:38,861 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:39,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:39,824 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2022-11-25 23:39:39,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-25 23:39:39,825 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2022-11-25 23:39:39,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:39,826 INFO L225 Difference]: With dead ends: 276 [2022-11-25 23:39:39,826 INFO L226 Difference]: Without dead ends: 191 [2022-11-25 23:39:39,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 315 SyntacticMatches, 38 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3383 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1859, Invalid=6883, Unknown=0, NotChecked=0, Total=8742 [2022-11-25 23:39:39,828 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 141 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:39,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 464 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:39:39,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-11-25 23:39:39,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 131. [2022-11-25 23:39:39,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:39,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2022-11-25 23:39:39,852 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 128 [2022-11-25 23:39:39,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:39,853 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2022-11-25 23:39:39,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:39,853 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2022-11-25 23:39:39,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-25 23:39:39,854 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:39,854 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:39,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:40,061 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-25 23:39:40,062 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:40,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:40,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 29 times [2022-11-25 23:39:40,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:40,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211098220] [2022-11-25 23:39:40,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:40,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:40,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:41,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:41,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:41,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211098220] [2022-11-25 23:39:41,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211098220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:41,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1589609643] [2022-11-25 23:39:41,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:39:41,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:41,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:41,616 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:41,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-25 23:39:41,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-11-25 23:39:41,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:41,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-25 23:39:41,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:43,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:43,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:43,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:43,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1589609643] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:43,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2067747071] [2022-11-25 23:39:43,976 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:43,976 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:43,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:43,976 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:43,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:44,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:44,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23376#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:44,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:44,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:44,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-11-25 23:39:44,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195830812] [2022-11-25 23:39:44,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:44,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-25 23:39:44,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:44,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-25 23:39:44,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2022-11-25 23:39:44,821 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:45,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:45,667 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2022-11-25 23:39:45,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-25 23:39:45,668 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2022-11-25 23:39:45,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:45,669 INFO L225 Difference]: With dead ends: 283 [2022-11-25 23:39:45,669 INFO L226 Difference]: Without dead ends: 196 [2022-11-25 23:39:45,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 318 SyntacticMatches, 40 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3586 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2022-11-25 23:39:45,671 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 146 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:45,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 394 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:39:45,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-25 23:39:45,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2022-11-25 23:39:45,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:45,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2022-11-25 23:39:45,692 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2022-11-25 23:39:45,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:45,692 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2022-11-25 23:39:45,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:45,693 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2022-11-25 23:39:45,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-25 23:39:45,694 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:45,694 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:45,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:45,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:45,900 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:45,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:45,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 30 times [2022-11-25 23:39:45,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:45,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145448724] [2022-11-25 23:39:45,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:45,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:45,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:46,831 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:46,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:46,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145448724] [2022-11-25 23:39:46,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145448724] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:46,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355935176] [2022-11-25 23:39:46,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:39:46,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:46,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:46,835 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:46,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-25 23:39:46,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:39:46,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:46,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-25 23:39:46,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:47,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:47,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:47,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355935176] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:47,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1224442722] [2022-11-25 23:39:47,915 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:47,915 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:47,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:47,915 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:47,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:48,043 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:48,495 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:48,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:48,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:48,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2022-11-25 23:39:48,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517909068] [2022-11-25 23:39:48,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:48,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-25 23:39:48,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:48,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-25 23:39:48,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=980, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 23:39:48,498 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:49,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:49,064 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2022-11-25 23:39:49,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 23:39:49,065 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2022-11-25 23:39:49,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:49,066 INFO L225 Difference]: With dead ends: 150 [2022-11-25 23:39:49,066 INFO L226 Difference]: Without dead ends: 148 [2022-11-25 23:39:49,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 363 SyntacticMatches, 40 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1005, Invalid=2655, Unknown=0, NotChecked=0, Total=3660 [2022-11-25 23:39:49,067 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 143 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:49,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 196 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:39:49,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-11-25 23:39:49,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2022-11-25 23:39:49,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:49,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2022-11-25 23:39:49,087 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2022-11-25 23:39:49,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:49,087 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2022-11-25 23:39:49,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:49,088 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2022-11-25 23:39:49,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-11-25 23:39:49,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:49,089 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:49,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:49,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-25 23:39:49,295 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:49,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:49,295 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 31 times [2022-11-25 23:39:49,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:49,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518539514] [2022-11-25 23:39:49,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:49,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:49,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:50,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:50,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:50,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518539514] [2022-11-25 23:39:50,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518539514] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:50,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082646998] [2022-11-25 23:39:50,544 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:39:50,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:50,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:50,545 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:50,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-25 23:39:50,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:50,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-25 23:39:50,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:51,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:51,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:52,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:39:52,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082646998] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:52,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1475418213] [2022-11-25 23:39:52,828 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:52,828 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:52,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:52,829 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:52,829 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:52,930 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:39:53,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26240#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:39:53,599 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:39:53,599 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:39:53,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 71 [2022-11-25 23:39:53,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70140956] [2022-11-25 23:39:53,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:39:53,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-25 23:39:53,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:39:53,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-25 23:39:53,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=5117, Unknown=0, NotChecked=0, Total=6320 [2022-11-25 23:39:53,602 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:54,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:39:54,453 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2022-11-25 23:39:54,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-25 23:39:54,454 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2022-11-25 23:39:54,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:39:54,455 INFO L225 Difference]: With dead ends: 302 [2022-11-25 23:39:54,455 INFO L226 Difference]: Without dead ends: 209 [2022-11-25 23:39:54,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 345 SyntacticMatches, 42 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3985 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2217, Invalid=8085, Unknown=0, NotChecked=0, Total=10302 [2022-11-25 23:39:54,457 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 221 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:39:54,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 436 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:39:54,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-11-25 23:39:54,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 143. [2022-11-25 23:39:54,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:54,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2022-11-25 23:39:54,478 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 140 [2022-11-25 23:39:54,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:39:54,479 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2022-11-25 23:39:54,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:39:54,479 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2022-11-25 23:39:54,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-25 23:39:54,480 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:39:54,480 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:39:54,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-25 23:39:54,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:54,686 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:39:54,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:39:54,687 INFO L85 PathProgramCache]: Analyzing trace with hash 634014528, now seen corresponding path program 32 times [2022-11-25 23:39:54,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:39:54,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997751857] [2022-11-25 23:39:54,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:39:54,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:39:54,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:39:56,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:56,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:39:56,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997751857] [2022-11-25 23:39:56,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997751857] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:39:56,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984815484] [2022-11-25 23:39:56,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:39:56,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:39:56,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:39:56,196 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:39:56,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-25 23:39:56,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-25 23:39:56,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:39:56,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-25 23:39:56,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:39:57,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:57,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:39:59,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:39:59,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984815484] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:39:59,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1271756808] [2022-11-25 23:39:59,186 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:39:59,186 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:39:59,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:39:59,186 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:39:59,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:39:59,326 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:00,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27862#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:00,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:00,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:00,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2022-11-25 23:40:00,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134695642] [2022-11-25 23:40:00,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:00,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-25 23:40:00,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:00,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-25 23:40:00,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=5365, Unknown=0, NotChecked=0, Total=6642 [2022-11-25 23:40:00,194 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:01,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:01,353 INFO L93 Difference]: Finished difference Result 309 states and 335 transitions. [2022-11-25 23:40:01,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-25 23:40:01,353 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2022-11-25 23:40:01,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:01,355 INFO L225 Difference]: With dead ends: 309 [2022-11-25 23:40:01,355 INFO L226 Difference]: Without dead ends: 214 [2022-11-25 23:40:01,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 348 SyntacticMatches, 44 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4204 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2383, Invalid=8537, Unknown=0, NotChecked=0, Total=10920 [2022-11-25 23:40:01,358 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 177 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:01,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 477 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:40:01,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-11-25 23:40:01,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2022-11-25 23:40:01,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:01,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2022-11-25 23:40:01,406 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 142 [2022-11-25 23:40:01,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:01,406 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2022-11-25 23:40:01,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:01,407 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2022-11-25 23:40:01,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-25 23:40:01,408 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:01,408 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:01,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:01,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-25 23:40:01,620 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:01,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:01,621 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 33 times [2022-11-25 23:40:01,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:01,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754299868] [2022-11-25 23:40:01,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:01,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:01,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:02,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:02,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:02,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754299868] [2022-11-25 23:40:02,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754299868] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:02,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233013360] [2022-11-25 23:40:02,680 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:40:02,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:02,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:02,683 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:02,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-25 23:40:02,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:40:02,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:02,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-25 23:40:02,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:03,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:03,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:03,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:03,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [233013360] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:03,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60224760] [2022-11-25 23:40:03,927 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:03,927 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:03,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:03,928 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:03,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:04,056 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:04,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29468#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:04,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:04,607 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:04,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2022-11-25 23:40:04,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191266372] [2022-11-25 23:40:04,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:04,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-25 23:40:04,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:04,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-25 23:40:04,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1079, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 23:40:04,610 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:05,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:05,135 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2022-11-25 23:40:05,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-25 23:40:05,136 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 144 [2022-11-25 23:40:05,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:05,137 INFO L225 Difference]: With dead ends: 162 [2022-11-25 23:40:05,137 INFO L226 Difference]: Without dead ends: 160 [2022-11-25 23:40:05,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 397 SyntacticMatches, 44 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1804 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1162, Invalid=2998, Unknown=0, NotChecked=0, Total=4160 [2022-11-25 23:40:05,138 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 156 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:05,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 188 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:40:05,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-25 23:40:05,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2022-11-25 23:40:05,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:05,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2022-11-25 23:40:05,161 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2022-11-25 23:40:05,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:05,161 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2022-11-25 23:40:05,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:05,162 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2022-11-25 23:40:05,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-25 23:40:05,163 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:05,163 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:05,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:05,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-25 23:40:05,369 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:05,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:05,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 34 times [2022-11-25 23:40:05,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:05,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254405625] [2022-11-25 23:40:05,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:05,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:05,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:06,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:06,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:06,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254405625] [2022-11-25 23:40:06,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254405625] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:06,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880361232] [2022-11-25 23:40:06,830 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:40:06,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:06,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:06,831 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:06,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-25 23:40:06,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:06,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-25 23:40:06,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:08,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:40:08,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:09,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:40:09,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880361232] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:09,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209740116] [2022-11-25 23:40:09,263 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:09,263 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:09,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:09,264 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:09,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:09,367 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:10,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30978#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:10,070 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:10,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:10,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 77 [2022-11-25 23:40:10,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132779620] [2022-11-25 23:40:10,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:10,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-11-25 23:40:10,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:10,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-11-25 23:40:10,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=5905, Unknown=0, NotChecked=0, Total=7310 [2022-11-25 23:40:10,075 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:11,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:11,126 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2022-11-25 23:40:11,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 23:40:11,126 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 152 [2022-11-25 23:40:11,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:11,127 INFO L225 Difference]: With dead ends: 328 [2022-11-25 23:40:11,127 INFO L226 Difference]: Without dead ends: 227 [2022-11-25 23:40:11,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 375 SyntacticMatches, 46 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4635 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2607, Invalid=9383, Unknown=0, NotChecked=0, Total=11990 [2022-11-25 23:40:11,129 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 166 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:11,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 641 Invalid, 737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:40:11,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-11-25 23:40:11,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 155. [2022-11-25 23:40:11,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:11,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2022-11-25 23:40:11,154 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 152 [2022-11-25 23:40:11,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:11,154 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2022-11-25 23:40:11,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:11,155 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2022-11-25 23:40:11,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-11-25 23:40:11,155 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:11,156 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:11,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:11,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-25 23:40:11,362 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:11,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:11,363 INFO L85 PathProgramCache]: Analyzing trace with hash -183124176, now seen corresponding path program 35 times [2022-11-25 23:40:11,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:11,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323836111] [2022-11-25 23:40:11,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:11,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:11,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:12,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:12,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:12,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323836111] [2022-11-25 23:40:12,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323836111] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:12,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083428545] [2022-11-25 23:40:12,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:40:12,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:12,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:12,730 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:12,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-25 23:40:12,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-11-25 23:40:12,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:12,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-25 23:40:12,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:14,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:14,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:15,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:15,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083428545] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:15,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206692515] [2022-11-25 23:40:15,297 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:15,297 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:15,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:15,297 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:15,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:15,390 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:16,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32738#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:16,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:16,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:16,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2022-11-25 23:40:16,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61696982] [2022-11-25 23:40:16,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:16,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-25 23:40:16,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:16,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-25 23:40:16,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=6171, Unknown=0, NotChecked=0, Total=7656 [2022-11-25 23:40:16,107 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:17,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:17,141 INFO L93 Difference]: Finished difference Result 335 states and 363 transitions. [2022-11-25 23:40:17,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-25 23:40:17,141 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2022-11-25 23:40:17,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:17,143 INFO L225 Difference]: With dead ends: 335 [2022-11-25 23:40:17,143 INFO L226 Difference]: Without dead ends: 232 [2022-11-25 23:40:17,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 378 SyntacticMatches, 48 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4870 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2787, Invalid=9869, Unknown=0, NotChecked=0, Total=12656 [2022-11-25 23:40:17,145 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 213 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:17,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 481 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:40:17,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-25 23:40:17,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2022-11-25 23:40:17,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:17,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2022-11-25 23:40:17,170 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 154 [2022-11-25 23:40:17,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:17,170 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2022-11-25 23:40:17,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:17,171 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2022-11-25 23:40:17,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2022-11-25 23:40:17,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:17,172 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:17,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:17,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-25 23:40:17,378 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:17,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:17,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 36 times [2022-11-25 23:40:17,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:17,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893921445] [2022-11-25 23:40:17,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:17,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:17,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:18,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:18,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:18,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893921445] [2022-11-25 23:40:18,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893921445] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:18,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998263800] [2022-11-25 23:40:18,189 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:40:18,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:18,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:18,191 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:18,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-25 23:40:18,314 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:40:18,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:18,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-25 23:40:18,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:18,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:18,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:19,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:19,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998263800] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:19,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [293775333] [2022-11-25 23:40:19,296 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:19,296 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:19,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:19,297 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:19,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:19,412 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:19,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34478#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:19,879 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:19,879 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:19,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2022-11-25 23:40:19,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990030530] [2022-11-25 23:40:19,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:19,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 23:40:19,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:19,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 23:40:19,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=1182, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 23:40:19,881 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:20,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:20,430 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2022-11-25 23:40:20,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-25 23:40:20,430 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2022-11-25 23:40:20,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:20,431 INFO L225 Difference]: With dead ends: 174 [2022-11-25 23:40:20,431 INFO L226 Difference]: Without dead ends: 172 [2022-11-25 23:40:20,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 431 SyntacticMatches, 48 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2056 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1331, Invalid=3361, Unknown=0, NotChecked=0, Total=4692 [2022-11-25 23:40:20,432 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 170 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:20,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 190 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:40:20,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-11-25 23:40:20,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2022-11-25 23:40:20,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:20,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2022-11-25 23:40:20,458 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2022-11-25 23:40:20,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:20,459 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2022-11-25 23:40:20,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:20,459 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2022-11-25 23:40:20,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-11-25 23:40:20,460 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:20,460 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:20,470 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-11-25 23:40:20,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-25 23:40:20,666 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:20,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:20,667 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 37 times [2022-11-25 23:40:20,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:20,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741205270] [2022-11-25 23:40:20,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:20,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:20,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:22,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:22,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:22,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741205270] [2022-11-25 23:40:22,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741205270] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:22,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814583830] [2022-11-25 23:40:22,236 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:40:22,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:22,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:22,237 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:22,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-25 23:40:22,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:22,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-25 23:40:22,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:23,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:40:23,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:25,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:40:25,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1814583830] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:25,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136473916] [2022-11-25 23:40:25,131 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:25,131 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:25,132 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:25,132 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:25,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:25,258 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:26,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36106#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:26,009 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:26,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:26,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2022-11-25 23:40:26,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249358134] [2022-11-25 23:40:26,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:26,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-25 23:40:26,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:26,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-25 23:40:26,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2022-11-25 23:40:26,012 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:27,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:27,112 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2022-11-25 23:40:27,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-25 23:40:27,112 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 164 [2022-11-25 23:40:27,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:27,114 INFO L225 Difference]: With dead ends: 354 [2022-11-25 23:40:27,114 INFO L226 Difference]: Without dead ends: 245 [2022-11-25 23:40:27,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 405 SyntacticMatches, 50 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5333 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2022-11-25 23:40:27,116 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 212 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:27,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 559 Invalid, 688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:40:27,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-11-25 23:40:27,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2022-11-25 23:40:27,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:27,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2022-11-25 23:40:27,138 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2022-11-25 23:40:27,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:27,139 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2022-11-25 23:40:27,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:27,139 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2022-11-25 23:40:27,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-11-25 23:40:27,140 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:27,140 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:27,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:27,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-25 23:40:27,340 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:27,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:27,341 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 38 times [2022-11-25 23:40:27,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:27,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199478433] [2022-11-25 23:40:27,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:27,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:27,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:28,865 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:28,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:28,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199478433] [2022-11-25 23:40:28,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199478433] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:28,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968620522] [2022-11-25 23:40:28,866 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:40:28,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:28,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:28,867 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:28,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-25 23:40:29,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2022-11-25 23:40:29,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:29,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-25 23:40:29,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:30,686 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1352 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:30,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:31,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1352 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:31,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968620522] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:31,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [974654436] [2022-11-25 23:40:31,856 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:31,856 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:31,856 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:31,856 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:31,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:31,968 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:32,786 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38004#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:32,787 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:32,787 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:32,787 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 85 [2022-11-25 23:40:32,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045646187] [2022-11-25 23:40:32,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:32,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-25 23:40:32,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:32,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-25 23:40:32,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=7033, Unknown=0, NotChecked=0, Total=8742 [2022-11-25 23:40:32,789 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:33,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:33,972 INFO L93 Difference]: Finished difference Result 361 states and 391 transitions. [2022-11-25 23:40:33,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-25 23:40:33,972 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2022-11-25 23:40:33,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:33,974 INFO L225 Difference]: With dead ends: 361 [2022-11-25 23:40:33,974 INFO L226 Difference]: Without dead ends: 250 [2022-11-25 23:40:33,976 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 408 SyntacticMatches, 52 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5584 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3223, Invalid=11297, Unknown=0, NotChecked=0, Total=14520 [2022-11-25 23:40:33,976 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 250 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:33,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [250 Valid, 540 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:40:33,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2022-11-25 23:40:33,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 169. [2022-11-25 23:40:33,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 168 states have (on average 1.0178571428571428) internal successors, (171), 168 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:33,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2022-11-25 23:40:33,996 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 166 [2022-11-25 23:40:33,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:33,996 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2022-11-25 23:40:33,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:33,997 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2022-11-25 23:40:33,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2022-11-25 23:40:33,997 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:33,997 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:34,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:34,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:34,198 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:34,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:34,199 INFO L85 PathProgramCache]: Analyzing trace with hash 604698053, now seen corresponding path program 39 times [2022-11-25 23:40:34,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:34,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699627268] [2022-11-25 23:40:34,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:34,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:34,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:35,254 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 702 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:35,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:35,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699627268] [2022-11-25 23:40:35,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699627268] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:35,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773285838] [2022-11-25 23:40:35,255 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:40:35,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:35,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:35,256 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:35,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-25 23:40:35,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:40:35,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:35,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-25 23:40:35,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 756 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:35,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:36,473 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 756 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:36,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773285838] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:36,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770773405] [2022-11-25 23:40:36,475 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:36,475 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:36,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:36,475 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:36,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:36,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:37,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39878#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:37,133 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:37,133 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:37,133 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 33 [2022-11-25 23:40:37,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565434995] [2022-11-25 23:40:37,134 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:37,134 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-25 23:40:37,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:37,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-25 23:40:37,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=1289, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:40:37,136 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:37,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:37,767 INFO L93 Difference]: Finished difference Result 186 states and 189 transitions. [2022-11-25 23:40:37,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-25 23:40:37,768 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 168 [2022-11-25 23:40:37,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:37,769 INFO L225 Difference]: With dead ends: 186 [2022-11-25 23:40:37,769 INFO L226 Difference]: Without dead ends: 184 [2022-11-25 23:40:37,770 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 465 SyntacticMatches, 52 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2324 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1512, Invalid=3744, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 23:40:37,770 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:37,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 251 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:40:37,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-25 23:40:37,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 177. [2022-11-25 23:40:37,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:37,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2022-11-25 23:40:37,799 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 168 [2022-11-25 23:40:37,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:37,800 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2022-11-25 23:40:37,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:37,800 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2022-11-25 23:40:37,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-11-25 23:40:37,801 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:37,801 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:37,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:38,008 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:38,008 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:38,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:38,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1162104149, now seen corresponding path program 40 times [2022-11-25 23:40:38,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:38,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596688544] [2022-11-25 23:40:38,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:38,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:38,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:39,707 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1487 proven. 837 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:39,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:39,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596688544] [2022-11-25 23:40:39,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596688544] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:39,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207810617] [2022-11-25 23:40:39,708 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:40:39,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:39,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:39,709 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:39,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-25 23:40:39,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:39,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-25 23:40:39,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:41,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1566 proven. 756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:40:41,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:42,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1566 proven. 756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:40:42,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207810617] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:42,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1870381664] [2022-11-25 23:40:42,804 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:42,805 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:42,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:42,805 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:42,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:42,899 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:43,673 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41624#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:43,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:43,674 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:43,674 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 89 [2022-11-25 23:40:43,674 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583819784] [2022-11-25 23:40:43,674 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:43,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-25 23:40:43,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:43,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-25 23:40:43,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1857, Invalid=7649, Unknown=0, NotChecked=0, Total=9506 [2022-11-25 23:40:43,677 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:44,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:44,971 INFO L93 Difference]: Finished difference Result 380 states and 411 transitions. [2022-11-25 23:40:44,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-25 23:40:44,971 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2022-11-25 23:40:44,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:44,972 INFO L225 Difference]: With dead ends: 380 [2022-11-25 23:40:44,972 INFO L226 Difference]: Without dead ends: 263 [2022-11-25 23:40:44,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 435 SyntacticMatches, 54 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6079 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3483, Invalid=12267, Unknown=0, NotChecked=0, Total=15750 [2022-11-25 23:40:44,974 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 204 mSDsluCounter, 593 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 651 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:44,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 651 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:40:44,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-11-25 23:40:45,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 179. [2022-11-25 23:40:45,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:45,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2022-11-25 23:40:45,004 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 176 [2022-11-25 23:40:45,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:45,007 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2022-11-25 23:40:45,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:45,007 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2022-11-25 23:40:45,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-25 23:40:45,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:45,008 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:45,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-11-25 23:40:45,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:45,214 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:45,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:45,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 41 times [2022-11-25 23:40:45,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:45,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328556541] [2022-11-25 23:40:45,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:45,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:45,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:46,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:46,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:46,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328556541] [2022-11-25 23:40:46,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328556541] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:46,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895626629] [2022-11-25 23:40:46,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:40:46,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:46,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:46,991 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:47,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-25 23:40:47,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-25 23:40:47,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:47,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-25 23:40:47,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:49,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:49,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:50,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:50,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895626629] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:50,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1300605832] [2022-11-25 23:40:50,351 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:50,352 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:50,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:50,352 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:50,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:50,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:51,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43660#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:51,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:51,247 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:51,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-11-25 23:40:51,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225895320] [2022-11-25 23:40:51,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:51,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-11-25 23:40:51,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:51,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-11-25 23:40:51,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2022-11-25 23:40:51,249 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:52,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:52,635 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2022-11-25 23:40:52,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-25 23:40:52,636 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2022-11-25 23:40:52,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:52,637 INFO L225 Difference]: With dead ends: 387 [2022-11-25 23:40:52,637 INFO L226 Difference]: Without dead ends: 268 [2022-11-25 23:40:52,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 438 SyntacticMatches, 56 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6346 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2022-11-25 23:40:52,640 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 247 mSDsluCounter, 703 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:52,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 763 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:40:52,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-25 23:40:52,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2022-11-25 23:40:52,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:52,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2022-11-25 23:40:52,674 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2022-11-25 23:40:52,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:52,674 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2022-11-25 23:40:52,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:52,674 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2022-11-25 23:40:52,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2022-11-25 23:40:52,675 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:52,675 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:52,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:52,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-25 23:40:52,876 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:52,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:52,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 42 times [2022-11-25 23:40:52,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:52,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102310699] [2022-11-25 23:40:52,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:52,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:52,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:53,956 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:53,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:53,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102310699] [2022-11-25 23:40:53,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102310699] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:53,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662552458] [2022-11-25 23:40:53,956 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:40:53,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:53,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:53,959 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:53,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-25 23:40:54,111 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:40:54,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:40:54,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-25 23:40:54,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:54,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:54,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:55,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:55,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662552458] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:55,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [347455589] [2022-11-25 23:40:55,366 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:40:55,366 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:55,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:55,367 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:55,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:55,474 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:55,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45668#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:55,950 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:55,950 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:40:55,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2022-11-25 23:40:55,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536687471] [2022-11-25 23:40:55,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:55,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-25 23:40:55,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:55,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-25 23:40:55,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1400, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:40:55,952 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:56,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:56,628 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2022-11-25 23:40:56,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-25 23:40:56,628 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 180 [2022-11-25 23:40:56,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:56,630 INFO L225 Difference]: With dead ends: 198 [2022-11-25 23:40:56,630 INFO L226 Difference]: Without dead ends: 196 [2022-11-25 23:40:56,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 499 SyntacticMatches, 56 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2608 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1705, Invalid=4147, Unknown=0, NotChecked=0, Total=5852 [2022-11-25 23:40:56,631 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 195 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:56,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 242 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:40:56,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-25 23:40:56,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2022-11-25 23:40:56,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:56,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2022-11-25 23:40:56,670 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2022-11-25 23:40:56,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:56,671 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2022-11-25 23:40:56,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:40:56,671 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2022-11-25 23:40:56,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-11-25 23:40:56,672 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:56,672 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:56,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:56,872 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:56,873 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:56,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:56,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 43 times [2022-11-25 23:40:56,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:56,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650579196] [2022-11-25 23:40:56,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:56,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:56,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:58,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:40:58,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:58,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650579196] [2022-11-25 23:40:58,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650579196] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:58,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95497405] [2022-11-25 23:40:58,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:40:58,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:58,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:58,851 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:58,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-25 23:40:58,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:58,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-25 23:40:58,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:00,913 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1798 proven. 870 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:41:00,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:02,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1798 proven. 870 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:41:02,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95497405] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:02,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247316805] [2022-11-25 23:41:02,322 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:02,322 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:02,322 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:02,322 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:02,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:02,433 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:03,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47532#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:03,249 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:03,249 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:03,249 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 95 [2022-11-25 23:41:03,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176476644] [2022-11-25 23:41:03,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:03,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-11-25 23:41:03,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:03,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-11-25 23:41:03,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2107, Invalid=8605, Unknown=0, NotChecked=0, Total=10712 [2022-11-25 23:41:03,252 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:04,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:04,690 INFO L93 Difference]: Finished difference Result 406 states and 439 transitions. [2022-11-25 23:41:04,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-25 23:41:04,690 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2022-11-25 23:41:04,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:04,692 INFO L225 Difference]: With dead ends: 406 [2022-11-25 23:41:04,692 INFO L226 Difference]: Without dead ends: 281 [2022-11-25 23:41:04,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 465 SyntacticMatches, 58 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6873 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3969, Invalid=13853, Unknown=0, NotChecked=0, Total=17822 [2022-11-25 23:41:04,694 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 267 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:04,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 644 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:41:04,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2022-11-25 23:41:04,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 191. [2022-11-25 23:41:04,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:04,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 193 transitions. [2022-11-25 23:41:04,722 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 193 transitions. Word has length 188 [2022-11-25 23:41:04,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:04,723 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 193 transitions. [2022-11-25 23:41:04,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:04,723 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 193 transitions. [2022-11-25 23:41:04,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-11-25 23:41:04,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:04,724 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:04,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:04,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-25 23:41:04,924 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:04,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:04,924 INFO L85 PathProgramCache]: Analyzing trace with hash 714080512, now seen corresponding path program 44 times [2022-11-25 23:41:04,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:04,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114647822] [2022-11-25 23:41:04,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:04,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:04,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1713 proven. 1017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:06,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:06,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114647822] [2022-11-25 23:41:06,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114647822] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:06,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096539264] [2022-11-25 23:41:06,956 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:41:06,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:06,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:06,957 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:06,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-25 23:41:07,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-11-25 23:41:07,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:41:07,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-25 23:41:07,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:09,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1800 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:09,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:10,691 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1800 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:10,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096539264] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:10,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628357817] [2022-11-25 23:41:10,693 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:10,693 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:10,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:10,693 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:10,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:10,798 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:11,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49706#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:11,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:11,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:11,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2022-11-25 23:41:11,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487432468] [2022-11-25 23:41:11,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:11,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-11-25 23:41:11,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:11,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-11-25 23:41:11,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2205, Invalid=8925, Unknown=0, NotChecked=0, Total=11130 [2022-11-25 23:41:11,619 INFO L87 Difference]: Start difference. First operand 191 states and 193 transitions. Second operand has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:13,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:13,127 INFO L93 Difference]: Finished difference Result 413 states and 447 transitions. [2022-11-25 23:41:13,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-25 23:41:13,128 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 190 [2022-11-25 23:41:13,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:13,130 INFO L225 Difference]: With dead ends: 413 [2022-11-25 23:41:13,130 INFO L226 Difference]: Without dead ends: 286 [2022-11-25 23:41:13,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 468 SyntacticMatches, 60 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7156 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=4191, Invalid=14441, Unknown=0, NotChecked=0, Total=18632 [2022-11-25 23:41:13,131 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 267 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 663 SdHoareTripleChecker+Invalid, 819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:13,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 663 Invalid, 819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:41:13,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-11-25 23:41:13,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2022-11-25 23:41:13,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:13,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2022-11-25 23:41:13,162 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 190 [2022-11-25 23:41:13,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:13,162 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2022-11-25 23:41:13,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:13,163 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2022-11-25 23:41:13,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-11-25 23:41:13,164 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:13,164 INFO L195 NwaCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:13,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:13,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-25 23:41:13,365 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:13,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:13,365 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 45 times [2022-11-25 23:41:13,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:13,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602706433] [2022-11-25 23:41:13,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:13,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:13,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:14,733 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:14,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:14,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602706433] [2022-11-25 23:41:14,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602706433] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:14,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140062051] [2022-11-25 23:41:14,733 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:41:14,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:14,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:14,734 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:14,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-25 23:41:14,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:41:14,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:41:14,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-25 23:41:14,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:15,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:15,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:16,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:16,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140062051] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:16,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [695346950] [2022-11-25 23:41:16,194 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:16,195 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:16,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:16,195 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:16,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:16,301 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:16,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:16,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:16,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:16,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2022-11-25 23:41:16,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284377317] [2022-11-25 23:41:16,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:16,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-25 23:41:16,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:16,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-25 23:41:16,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=1515, Unknown=0, NotChecked=0, Total=2162 [2022-11-25 23:41:16,802 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:17,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:17,549 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2022-11-25 23:41:17,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-25 23:41:17,550 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2022-11-25 23:41:17,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:17,550 INFO L225 Difference]: With dead ends: 210 [2022-11-25 23:41:17,550 INFO L226 Difference]: Without dead ends: 208 [2022-11-25 23:41:17,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 533 SyntacticMatches, 60 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2908 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1910, Invalid=4570, Unknown=0, NotChecked=0, Total=6480 [2022-11-25 23:41:17,552 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 204 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:17,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 245 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:41:17,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-25 23:41:17,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2022-11-25 23:41:17,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:17,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2022-11-25 23:41:17,577 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2022-11-25 23:41:17,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:17,577 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2022-11-25 23:41:17,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:17,578 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2022-11-25 23:41:17,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2022-11-25 23:41:17,579 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:17,579 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:17,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:17,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-25 23:41:17,785 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:17,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:17,786 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 46 times [2022-11-25 23:41:17,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:17,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142752948] [2022-11-25 23:41:17,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:17,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:20,135 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:20,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:20,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142752948] [2022-11-25 23:41:20,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142752948] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:20,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297111094] [2022-11-25 23:41:20,136 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:41:20,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:20,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:20,137 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:20,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-25 23:41:20,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:20,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-25 23:41:20,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:22,430 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2046 proven. 992 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:41:22,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:24,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2046 proven. 992 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:41:24,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297111094] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:24,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1646245600] [2022-11-25 23:41:24,014 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:24,014 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:24,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:24,015 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:24,015 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:24,121 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:24,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53830#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:24,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:24,961 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:24,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 101 [2022-11-25 23:41:24,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492960822] [2022-11-25 23:41:24,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:24,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-25 23:41:24,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:24,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-25 23:41:24,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2373, Invalid=9617, Unknown=0, NotChecked=0, Total=11990 [2022-11-25 23:41:24,964 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:26,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:26,628 INFO L93 Difference]: Finished difference Result 432 states and 467 transitions. [2022-11-25 23:41:26,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-25 23:41:26,628 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2022-11-25 23:41:26,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:26,629 INFO L225 Difference]: With dead ends: 432 [2022-11-25 23:41:26,629 INFO L226 Difference]: Without dead ends: 299 [2022-11-25 23:41:26,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 495 SyntacticMatches, 62 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7715 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4487, Invalid=15535, Unknown=0, NotChecked=0, Total=20022 [2022-11-25 23:41:26,630 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 326 mSDsluCounter, 729 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 795 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:26,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 795 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 842 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:41:26,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-11-25 23:41:26,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 203. [2022-11-25 23:41:26,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.0148514851485149) internal successors, (205), 202 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:26,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2022-11-25 23:41:26,654 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 200 [2022-11-25 23:41:26,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:26,654 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2022-11-25 23:41:26,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:26,654 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2022-11-25 23:41:26,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2022-11-25 23:41:26,655 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:26,655 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:26,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:26,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-25 23:41:26,856 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:26,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:26,856 INFO L85 PathProgramCache]: Analyzing trace with hash 788379888, now seen corresponding path program 47 times [2022-11-25 23:41:26,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:26,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865249984] [2022-11-25 23:41:26,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:26,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:26,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:29,197 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 1955 proven. 1149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:29,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:29,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865249984] [2022-11-25 23:41:29,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865249984] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:29,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634429940] [2022-11-25 23:41:29,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:41:29,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:29,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:29,199 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:29,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-25 23:41:29,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2022-11-25 23:41:29,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:41:29,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-25 23:41:29,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:31,713 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2048 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:31,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:33,391 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2048 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:33,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634429940] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:33,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [93896642] [2022-11-25 23:41:33,393 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:33,393 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:33,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:33,393 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:33,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:33,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:34,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56142#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:34,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:34,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:34,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2022-11-25 23:41:34,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258297328] [2022-11-25 23:41:34,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:34,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-25 23:41:34,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:34,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-25 23:41:34,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2477, Invalid=9955, Unknown=0, NotChecked=0, Total=12432 [2022-11-25 23:41:34,347 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:36,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:36,025 INFO L93 Difference]: Finished difference Result 439 states and 475 transitions. [2022-11-25 23:41:36,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-25 23:41:36,026 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 202 [2022-11-25 23:41:36,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:36,027 INFO L225 Difference]: With dead ends: 439 [2022-11-25 23:41:36,027 INFO L226 Difference]: Without dead ends: 304 [2022-11-25 23:41:36,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 705 GetRequests, 498 SyntacticMatches, 64 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8014 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4723, Invalid=16157, Unknown=0, NotChecked=0, Total=20880 [2022-11-25 23:41:36,028 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 300 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 708 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 708 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:36,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 682 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 708 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:41:36,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-11-25 23:41:36,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2022-11-25 23:41:36,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:36,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2022-11-25 23:41:36,065 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 202 [2022-11-25 23:41:36,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:36,065 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2022-11-25 23:41:36,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:36,066 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2022-11-25 23:41:36,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2022-11-25 23:41:36,067 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:36,067 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:36,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:36,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-25 23:41:36,274 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:36,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:36,274 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 48 times [2022-11-25 23:41:36,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:36,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777912593] [2022-11-25 23:41:36,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:36,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:36,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:37,785 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:37,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:37,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777912593] [2022-11-25 23:41:37,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777912593] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:37,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724942827] [2022-11-25 23:41:37,785 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:41:37,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:37,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:37,787 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:37,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-25 23:41:37,941 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:41:37,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:41:37,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-25 23:41:37,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:38,311 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:38,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:39,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:39,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724942827] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:39,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [633476014] [2022-11-25 23:41:39,502 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:39,502 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:39,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:39,502 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:39,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:39,597 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:40,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58418#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:40,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:40,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:40,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2022-11-25 23:41:40,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493339750] [2022-11-25 23:41:40,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:40,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 23:41:40,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:40,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 23:41:40,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=1634, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:41:40,094 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:40,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:40,902 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2022-11-25 23:41:40,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-25 23:41:40,903 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 204 [2022-11-25 23:41:40,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:40,905 INFO L225 Difference]: With dead ends: 222 [2022-11-25 23:41:40,905 INFO L226 Difference]: Without dead ends: 220 [2022-11-25 23:41:40,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 567 SyntacticMatches, 64 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3224 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2127, Invalid=5013, Unknown=0, NotChecked=0, Total=7140 [2022-11-25 23:41:40,906 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 114 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:40,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 322 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:41:40,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2022-11-25 23:41:40,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2022-11-25 23:41:40,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:40,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2022-11-25 23:41:40,946 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2022-11-25 23:41:40,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:40,947 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2022-11-25 23:41:40,947 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:40,947 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2022-11-25 23:41:40,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2022-11-25 23:41:40,948 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:40,949 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:40,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:41,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2022-11-25 23:41:41,155 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:41,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:41,155 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 49 times [2022-11-25 23:41:41,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:41,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68625421] [2022-11-25 23:41:41,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:41,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:41,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:43,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:43,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:43,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68625421] [2022-11-25 23:41:43,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68625421] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:43,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161978721] [2022-11-25 23:41:43,651 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:41:43,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:43,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:43,655 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:43,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-25 23:41:43,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:43,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-25 23:41:43,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:46,200 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:41:46,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:47,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:41:47,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161978721] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:47,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1483037819] [2022-11-25 23:41:47,947 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:47,947 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:47,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:47,948 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:47,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:48,058 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:48,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60518#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:48,949 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:48,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:48,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2022-11-25 23:41:48,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818137230] [2022-11-25 23:41:48,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:48,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-11-25 23:41:48,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:48,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-11-25 23:41:48,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2022-11-25 23:41:48,952 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:50,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:50,759 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2022-11-25 23:41:50,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-25 23:41:50,759 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2022-11-25 23:41:50,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:50,761 INFO L225 Difference]: With dead ends: 458 [2022-11-25 23:41:50,761 INFO L226 Difference]: Without dead ends: 317 [2022-11-25 23:41:50,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 525 SyntacticMatches, 66 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2022-11-25 23:41:50,764 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 296 mSDsluCounter, 781 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:50,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 851 Invalid, 1038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:41:50,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-11-25 23:41:50,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2022-11-25 23:41:50,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:50,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2022-11-25 23:41:50,799 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2022-11-25 23:41:50,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:50,800 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2022-11-25 23:41:50,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:41:50,800 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2022-11-25 23:41:50,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-11-25 23:41:50,801 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:50,802 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:50,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-25 23:41:51,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-11-25 23:41:51,008 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:51,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:51,008 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 50 times [2022-11-25 23:41:51,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:51,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467112032] [2022-11-25 23:41:51,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:51,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:51,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:53,638 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:53,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:53,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467112032] [2022-11-25 23:41:53,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467112032] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:41:53,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355845032] [2022-11-25 23:41:53,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:41:53,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:53,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:53,639 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:53,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-25 23:41:53,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-11-25 23:41:53,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:41:53,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-25 23:41:53,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:56,610 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:56,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:58,557 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:41:58,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355845032] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:58,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2113180666] [2022-11-25 23:41:58,558 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:41:58,558 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:58,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:58,558 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:58,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:58,652 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:59,552 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62968#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:59,552 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:59,552 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:41:59,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2022-11-25 23:41:59,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598769863] [2022-11-25 23:41:59,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:59,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-25 23:41:59,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:59,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-25 23:41:59,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2765, Invalid=11041, Unknown=0, NotChecked=0, Total=13806 [2022-11-25 23:41:59,556 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:01,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:01,470 INFO L93 Difference]: Finished difference Result 465 states and 503 transitions. [2022-11-25 23:42:01,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-25 23:42:01,470 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 214 [2022-11-25 23:42:01,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:01,472 INFO L225 Difference]: With dead ends: 465 [2022-11-25 23:42:01,472 INFO L226 Difference]: Without dead ends: 322 [2022-11-25 23:42:01,474 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 528 SyntacticMatches, 68 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8920 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=5287, Invalid=17969, Unknown=0, NotChecked=0, Total=23256 [2022-11-25 23:42:01,474 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 317 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:01,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 791 Invalid, 972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 831 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:42:01,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-11-25 23:42:01,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 217. [2022-11-25 23:42:01,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.0138888888888888) internal successors, (219), 216 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:01,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2022-11-25 23:42:01,500 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 214 [2022-11-25 23:42:01,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:01,500 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2022-11-25 23:42:01,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:01,500 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2022-11-25 23:42:01,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2022-11-25 23:42:01,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:01,501 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:01,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-25 23:42:01,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:01,701 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:01,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:01,702 INFO L85 PathProgramCache]: Analyzing trace with hash -2024442491, now seen corresponding path program 51 times [2022-11-25 23:42:01,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:01,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058224838] [2022-11-25 23:42:01,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:01,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:01,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:03,354 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1190 proven. 2382 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:03,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:03,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058224838] [2022-11-25 23:42:03,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058224838] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:42:03,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580113878] [2022-11-25 23:42:03,355 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:42:03,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:03,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:03,356 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:03,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-25 23:42:03,511 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:42:03,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:42:03,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-25 23:42:03,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:03,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:03,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:05,228 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:05,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580113878] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:05,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738954442] [2022-11-25 23:42:05,229 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:42:05,229 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:05,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:05,230 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:05,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:05,324 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:42:05,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65378#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:05,832 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:05,832 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:42:05,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 41 [2022-11-25 23:42:05,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621269978] [2022-11-25 23:42:05,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:05,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-25 23:42:05,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:05,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-25 23:42:05,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=1757, Unknown=0, NotChecked=0, Total=2550 [2022-11-25 23:42:05,833 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:06,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:06,734 INFO L93 Difference]: Finished difference Result 234 states and 237 transitions. [2022-11-25 23:42:06,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-25 23:42:06,735 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 216 [2022-11-25 23:42:06,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:06,736 INFO L225 Difference]: With dead ends: 234 [2022-11-25 23:42:06,736 INFO L226 Difference]: Without dead ends: 232 [2022-11-25 23:42:06,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 601 SyntacticMatches, 68 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3556 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2356, Invalid=5476, Unknown=0, NotChecked=0, Total=7832 [2022-11-25 23:42:06,737 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 119 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:06,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 332 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:42:06,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-25 23:42:06,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2022-11-25 23:42:06,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:06,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2022-11-25 23:42:06,783 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 216 [2022-11-25 23:42:06,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:06,783 INFO L495 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2022-11-25 23:42:06,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:06,784 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2022-11-25 23:42:06,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2022-11-25 23:42:06,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:06,785 INFO L195 NwaCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:06,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-25 23:42:06,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:06,998 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:06,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:06,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1516925547, now seen corresponding path program 52 times [2022-11-25 23:42:06,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:06,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289320392] [2022-11-25 23:42:06,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:06,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:07,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:09,863 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2487 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:09,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:09,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289320392] [2022-11-25 23:42:09,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289320392] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:42:09,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585030968] [2022-11-25 23:42:09,864 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:42:09,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:09,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:09,866 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:09,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-25 23:42:10,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:10,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-25 23:42:10,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:12,704 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:42:12,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:14,699 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:42:14,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585030968] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:14,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1623084696] [2022-11-25 23:42:14,700 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:42:14,700 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:14,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:14,701 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:14,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:14,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:42:15,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67596#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:15,737 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:15,737 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:42:15,737 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 113 [2022-11-25 23:42:15,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793259180] [2022-11-25 23:42:15,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:15,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-25 23:42:15,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:15,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-25 23:42:15,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2953, Invalid=11809, Unknown=0, NotChecked=0, Total=14762 [2022-11-25 23:42:15,740 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:17,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:17,758 INFO L93 Difference]: Finished difference Result 484 states and 523 transitions. [2022-11-25 23:42:17,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-25 23:42:17,758 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 224 [2022-11-25 23:42:17,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:17,759 INFO L225 Difference]: With dead ends: 484 [2022-11-25 23:42:17,759 INFO L226 Difference]: Without dead ends: 335 [2022-11-25 23:42:17,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 555 SyntacticMatches, 70 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9543 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=5619, Invalid=19187, Unknown=0, NotChecked=0, Total=24806 [2022-11-25 23:42:17,761 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 370 mSDsluCounter, 777 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:17,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 851 Invalid, 1064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:42:17,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-11-25 23:42:17,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 227. [2022-11-25 23:42:17,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:17,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2022-11-25 23:42:17,801 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 224 [2022-11-25 23:42:17,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:17,801 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2022-11-25 23:42:17,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:17,802 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2022-11-25 23:42:17,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2022-11-25 23:42:17,803 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:17,803 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:17,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-25 23:42:18,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-25 23:42:18,010 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:18,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:18,010 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 53 times [2022-11-25 23:42:18,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:18,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628094586] [2022-11-25 23:42:18,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:18,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:18,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:20,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:20,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:20,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628094586] [2022-11-25 23:42:20,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628094586] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:42:20,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798501670] [2022-11-25 23:42:20,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:42:20,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:20,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:20,970 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:20,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-25 23:42:21,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2022-11-25 23:42:21,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:42:21,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-25 23:42:21,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:24,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:24,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:26,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:26,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798501670] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:26,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [450903717] [2022-11-25 23:42:26,186 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:42:26,186 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:26,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:26,187 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:26,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:26,279 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:42:27,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70184#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:27,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:27,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:42:27,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2022-11-25 23:42:27,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128886037] [2022-11-25 23:42:27,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:27,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-11-25 23:42:27,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:27,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-11-25 23:42:27,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2022-11-25 23:42:27,225 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:29,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:29,297 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2022-11-25 23:42:29,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-25 23:42:29,298 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 226 [2022-11-25 23:42:29,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:29,299 INFO L225 Difference]: With dead ends: 491 [2022-11-25 23:42:29,299 INFO L226 Difference]: Without dead ends: 340 [2022-11-25 23:42:29,300 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 558 SyntacticMatches, 72 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9874 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2022-11-25 23:42:29,301 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 354 mSDsluCounter, 758 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 834 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:29,301 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [354 Valid, 834 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:42:29,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-25 23:42:29,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2022-11-25 23:42:29,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:29,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2022-11-25 23:42:29,338 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2022-11-25 23:42:29,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:29,338 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2022-11-25 23:42:29,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:29,338 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2022-11-25 23:42:29,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2022-11-25 23:42:29,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:29,339 INFO L195 NwaCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:29,346 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2022-11-25 23:42:29,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:29,546 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:29,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:29,547 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 54 times [2022-11-25 23:42:29,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:29,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418683572] [2022-11-25 23:42:29,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:29,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:29,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:31,518 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:31,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:31,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418683572] [2022-11-25 23:42:31,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418683572] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:42:31,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905776803] [2022-11-25 23:42:31,519 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:42:31,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:31,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:31,520 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:31,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-25 23:42:31,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:42:31,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:42:31,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-25 23:42:31,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:32,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:32,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:33,454 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:33,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905776803] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:33,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1639717479] [2022-11-25 23:42:33,455 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:42:33,455 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:33,455 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:33,455 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:33,455 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:33,570 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:42:34,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72728#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:34,096 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:34,096 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:42:34,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2022-11-25 23:42:34,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543112398] [2022-11-25 23:42:34,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:34,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-25 23:42:34,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:34,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-25 23:42:34,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=872, Invalid=1884, Unknown=0, NotChecked=0, Total=2756 [2022-11-25 23:42:34,098 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:35,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:35,055 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2022-11-25 23:42:35,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-25 23:42:35,055 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2022-11-25 23:42:35,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:35,057 INFO L225 Difference]: With dead ends: 246 [2022-11-25 23:42:35,057 INFO L226 Difference]: Without dead ends: 244 [2022-11-25 23:42:35,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 635 SyntacticMatches, 72 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2597, Invalid=5959, Unknown=0, NotChecked=0, Total=8556 [2022-11-25 23:42:35,058 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 125 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:35,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 364 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:42:35,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-11-25 23:42:35,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2022-11-25 23:42:35,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:35,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2022-11-25 23:42:35,094 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2022-11-25 23:42:35,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:35,094 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2022-11-25 23:42:35,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:35,095 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2022-11-25 23:42:35,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2022-11-25 23:42:35,096 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:35,096 INFO L195 NwaCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:35,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-25 23:42:35,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-11-25 23:42:35,297 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:35,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:35,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 55 times [2022-11-25 23:42:35,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:35,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710818271] [2022-11-25 23:42:35,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:35,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:35,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:38,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:38,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:38,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710818271] [2022-11-25 23:42:38,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710818271] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:42:38,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077194418] [2022-11-25 23:42:38,635 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:42:38,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:38,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:38,636 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:38,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-25 23:42:38,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:38,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-25 23:42:38,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:41,921 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:42:41,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:44,374 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:42:44,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077194418] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:44,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020152753] [2022-11-25 23:42:44,376 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:42:44,376 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:44,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:44,376 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:44,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:44,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:42:45,586 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75064#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:45,586 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:45,587 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:42:45,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 119 [2022-11-25 23:42:45,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503227482] [2022-11-25 23:42:45,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:45,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-25 23:42:45,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:45,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-25 23:42:45,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3267, Invalid=12989, Unknown=0, NotChecked=0, Total=16256 [2022-11-25 23:42:45,591 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:48,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:48,305 INFO L93 Difference]: Finished difference Result 510 states and 551 transitions. [2022-11-25 23:42:48,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-25 23:42:48,306 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 236 [2022-11-25 23:42:48,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:48,308 INFO L225 Difference]: With dead ends: 510 [2022-11-25 23:42:48,308 INFO L226 Difference]: Without dead ends: 353 [2022-11-25 23:42:48,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 585 SyntacticMatches, 74 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10529 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2022-11-25 23:42:48,311 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 368 mSDsluCounter, 961 mSDsCounter, 0 mSdLazyCounter, 1092 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 1039 SdHoareTripleChecker+Invalid, 1258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 1092 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:48,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 1039 Invalid, 1258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 1092 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:42:48,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-11-25 23:42:48,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 239. [2022-11-25 23:42:48,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:48,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2022-11-25 23:42:48,380 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 236 [2022-11-25 23:42:48,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:48,380 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2022-11-25 23:42:48,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:42:48,380 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2022-11-25 23:42:48,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2022-11-25 23:42:48,383 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:48,384 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:48,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-25 23:42:48,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-25 23:42:48,590 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:48,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:48,590 INFO L85 PathProgramCache]: Analyzing trace with hash -379402560, now seen corresponding path program 56 times [2022-11-25 23:42:48,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:48,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650202748] [2022-11-25 23:42:48,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:48,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:48,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:51,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:51,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:51,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650202748] [2022-11-25 23:42:51,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650202748] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:42:51,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031823940] [2022-11-25 23:42:51,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:42:51,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:51,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:51,803 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:51,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-25 23:42:52,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2022-11-25 23:42:52,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:42:52,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-25 23:42:52,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:55,270 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:55,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:57,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:42:57,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031823940] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:57,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531425723] [2022-11-25 23:42:57,533 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:42:57,533 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:57,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:57,533 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:57,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:57,622 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:42:58,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77790#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:58,600 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:58,600 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:42:58,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2022-11-25 23:42:58,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419498408] [2022-11-25 23:42:58,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:58,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-25 23:42:58,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:58,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-25 23:42:58,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3389, Invalid=13381, Unknown=0, NotChecked=0, Total=16770 [2022-11-25 23:42:58,603 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:00,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:00,905 INFO L93 Difference]: Finished difference Result 517 states and 559 transitions. [2022-11-25 23:43:00,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-11-25 23:43:00,905 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 238 [2022-11-25 23:43:00,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:00,907 INFO L225 Difference]: With dead ends: 517 [2022-11-25 23:43:00,907 INFO L226 Difference]: Without dead ends: 358 [2022-11-25 23:43:00,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 588 SyntacticMatches, 76 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10876 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=6511, Invalid=21881, Unknown=0, NotChecked=0, Total=28392 [2022-11-25 23:43:00,909 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 355 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 938 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:00,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [355 Valid, 895 Invalid, 1096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 938 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:43:00,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-11-25 23:43:00,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2022-11-25 23:43:00,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:00,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2022-11-25 23:43:00,940 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 238 [2022-11-25 23:43:00,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:00,940 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2022-11-25 23:43:00,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:00,940 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2022-11-25 23:43:00,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-11-25 23:43:00,941 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:00,941 INFO L195 NwaCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:00,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-25 23:43:01,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-25 23:43:01,142 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:01,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:01,142 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 57 times [2022-11-25 23:43:01,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:01,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516348245] [2022-11-25 23:43:01,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:01,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:01,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:03,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:03,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:43:03,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516348245] [2022-11-25 23:43:03,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [516348245] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:43:03,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252922464] [2022-11-25 23:43:03,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:43:03,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:03,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:43:03,098 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:43:03,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-25 23:43:03,270 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:43:03,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:43:03,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-25 23:43:03,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:43:03,665 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:03,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:43:05,298 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:05,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252922464] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:43:05,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2009335757] [2022-11-25 23:43:05,299 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:43:05,299 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:43:05,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:43:05,299 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:43:05,299 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:43:05,416 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:43:05,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80468#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:43:05,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:43:05,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:43:05,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2022-11-25 23:43:05,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537619264] [2022-11-25 23:43:05,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:43:05,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-25 23:43:05,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:43:05,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-25 23:43:05,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2015, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 23:43:05,962 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:06,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:06,987 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2022-11-25 23:43:06,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-25 23:43:06,988 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 240 [2022-11-25 23:43:06,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:06,989 INFO L225 Difference]: With dead ends: 258 [2022-11-25 23:43:06,989 INFO L226 Difference]: Without dead ends: 256 [2022-11-25 23:43:06,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 669 SyntacticMatches, 76 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4268 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2850, Invalid=6462, Unknown=0, NotChecked=0, Total=9312 [2022-11-25 23:43:06,991 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 252 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:06,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 303 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:43:06,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-25 23:43:07,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2022-11-25 23:43:07,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:07,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2022-11-25 23:43:07,049 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2022-11-25 23:43:07,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:07,050 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2022-11-25 23:43:07,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:07,050 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2022-11-25 23:43:07,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2022-11-25 23:43:07,052 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:07,052 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:07,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-25 23:43:07,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-25 23:43:07,259 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:07,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:07,259 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 58 times [2022-11-25 23:43:07,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:07,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857243650] [2022-11-25 23:43:07,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:07,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:07,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:10,958 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:10,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:43:10,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857243650] [2022-11-25 23:43:10,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857243650] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:43:10,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394601936] [2022-11-25 23:43:10,958 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:43:10,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:10,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:43:10,960 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:43:10,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-25 23:43:11,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:11,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-25 23:43:11,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:43:14,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:43:14,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:43:17,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:43:17,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394601936] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:43:17,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [48784734] [2022-11-25 23:43:17,150 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:43:17,150 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:43:17,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:43:17,150 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:43:17,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:43:17,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:43:18,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82922#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:43:18,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:43:18,389 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:43:18,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 82, 82] total 125 [2022-11-25 23:43:18,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522639799] [2022-11-25 23:43:18,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:43:18,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-25 23:43:18,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:43:18,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-25 23:43:18,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3597, Invalid=14225, Unknown=0, NotChecked=0, Total=17822 [2022-11-25 23:43:18,391 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:20,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:20,928 INFO L93 Difference]: Finished difference Result 536 states and 579 transitions. [2022-11-25 23:43:20,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-25 23:43:20,928 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 248 [2022-11-25 23:43:20,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:20,929 INFO L225 Difference]: With dead ends: 536 [2022-11-25 23:43:20,929 INFO L226 Difference]: Without dead ends: 371 [2022-11-25 23:43:20,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 615 SyntacticMatches, 78 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11563 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=6879, Invalid=23223, Unknown=0, NotChecked=0, Total=30102 [2022-11-25 23:43:20,931 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 414 mSDsluCounter, 767 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 1089 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:20,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [414 Valid, 849 Invalid, 1089 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:43:20,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-25 23:43:20,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 251. [2022-11-25 23:43:20,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:20,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2022-11-25 23:43:20,971 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 248 [2022-11-25 23:43:20,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:20,971 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2022-11-25 23:43:20,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:20,971 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2022-11-25 23:43:20,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2022-11-25 23:43:20,972 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:20,973 INFO L195 NwaCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:20,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-25 23:43:21,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:21,175 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:21,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:21,175 INFO L85 PathProgramCache]: Analyzing trace with hash -1152728400, now seen corresponding path program 59 times [2022-11-25 23:43:21,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:21,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001993373] [2022-11-25 23:43:21,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:21,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:21,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:24,957 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:24,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:43:24,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001993373] [2022-11-25 23:43:24,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001993373] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:43:24,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135146718] [2022-11-25 23:43:24,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:43:24,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:24,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:43:24,958 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:43:24,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-25 23:43:25,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-11-25 23:43:25,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:43:25,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-25 23:43:25,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:43:28,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:28,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:43:31,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:31,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2135146718] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:43:31,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1599772351] [2022-11-25 23:43:31,228 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:43:31,228 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:43:31,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:43:31,229 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:43:31,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:43:31,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:43:32,431 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85786#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:43:32,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:43:32,432 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:43:32,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2022-11-25 23:43:32,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101363151] [2022-11-25 23:43:32,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:43:32,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-11-25 23:43:32,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:43:32,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-11-25 23:43:32,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=14635, Unknown=0, NotChecked=0, Total=18360 [2022-11-25 23:43:32,436 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:35,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:35,180 INFO L93 Difference]: Finished difference Result 543 states and 587 transitions. [2022-11-25 23:43:35,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-25 23:43:35,181 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 250 [2022-11-25 23:43:35,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:35,182 INFO L225 Difference]: With dead ends: 543 [2022-11-25 23:43:35,183 INFO L226 Difference]: Without dead ends: 376 [2022-11-25 23:43:35,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 618 SyntacticMatches, 80 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11926 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=7171, Invalid=23981, Unknown=0, NotChecked=0, Total=31152 [2022-11-25 23:43:35,187 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 361 mSDsluCounter, 897 mSDsCounter, 0 mSdLazyCounter, 1019 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 981 SdHoareTripleChecker+Invalid, 1180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 1019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:35,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 981 Invalid, 1180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 1019 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:43:35,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-11-25 23:43:35,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2022-11-25 23:43:35,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:35,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2022-11-25 23:43:35,248 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 250 [2022-11-25 23:43:35,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:35,248 INFO L495 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2022-11-25 23:43:35,249 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:35,249 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2022-11-25 23:43:35,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2022-11-25 23:43:35,250 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:35,250 INFO L195 NwaCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:35,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-25 23:43:35,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2022-11-25 23:43:35,459 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:35,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:35,459 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 60 times [2022-11-25 23:43:35,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:35,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683978784] [2022-11-25 23:43:35,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:35,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:35,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:37,972 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:37,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:43:37,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683978784] [2022-11-25 23:43:37,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683978784] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:43:37,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200925074] [2022-11-25 23:43:37,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:43:37,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:37,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:43:37,974 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:43:37,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-25 23:43:38,161 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:43:38,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:43:38,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-25 23:43:38,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:43:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:38,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:43:40,395 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:40,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200925074] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:43:40,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268087253] [2022-11-25 23:43:40,397 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:43:40,397 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:43:40,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:43:40,397 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:43:40,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:43:40,524 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:43:41,207 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:43:41,207 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:43:41,208 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:43:41,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2022-11-25 23:43:41,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793740499] [2022-11-25 23:43:41,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:43:41,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-25 23:43:41,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:43:41,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-25 23:43:41,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1042, Invalid=2150, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:43:41,210 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:42,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:42,386 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2022-11-25 23:43:42,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-25 23:43:42,386 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2022-11-25 23:43:42,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:42,387 INFO L225 Difference]: With dead ends: 270 [2022-11-25 23:43:42,387 INFO L226 Difference]: Without dead ends: 268 [2022-11-25 23:43:42,388 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 703 SyntacticMatches, 80 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4648 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3115, Invalid=6985, Unknown=0, NotChecked=0, Total=10100 [2022-11-25 23:43:42,388 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 140 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:42,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 376 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:43:42,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-25 23:43:42,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2022-11-25 23:43:42,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:42,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2022-11-25 23:43:42,426 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2022-11-25 23:43:42,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:42,426 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2022-11-25 23:43:42,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:42,426 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2022-11-25 23:43:42,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-11-25 23:43:42,427 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:42,427 INFO L195 NwaCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:42,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-25 23:43:42,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2022-11-25 23:43:42,631 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:42,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:42,631 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 61 times [2022-11-25 23:43:42,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:42,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1614790587] [2022-11-25 23:43:42,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:42,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:42,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:46,613 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:43:46,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:43:46,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1614790587] [2022-11-25 23:43:46,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1614790587] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:43:46,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266901224] [2022-11-25 23:43:46,614 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:43:46,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:46,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:43:46,615 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:43:46,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-25 23:43:46,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:46,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-25 23:43:46,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:43:50,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:43:50,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:43:53,260 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:43:53,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266901224] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:43:53,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637231231] [2022-11-25 23:43:53,261 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:43:53,261 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:43:53,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:43:53,261 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:43:53,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:43:53,374 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:43:54,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91170#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:43:54,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:43:54,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:43:54,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2022-11-25 23:43:54,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138807629] [2022-11-25 23:43:54,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:43:54,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-11-25 23:43:54,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:43:54,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-11-25 23:43:54,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2022-11-25 23:43:54,421 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:57,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:57,084 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2022-11-25 23:43:57,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-25 23:43:57,085 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 260 [2022-11-25 23:43:57,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:57,087 INFO L225 Difference]: With dead ends: 562 [2022-11-25 23:43:57,087 INFO L226 Difference]: Without dead ends: 389 [2022-11-25 23:43:57,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 645 SyntacticMatches, 82 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12645 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2022-11-25 23:43:57,089 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 416 mSDsluCounter, 809 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:57,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [416 Valid, 895 Invalid, 1125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:43:57,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-11-25 23:43:57,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2022-11-25 23:43:57,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:57,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2022-11-25 23:43:57,135 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2022-11-25 23:43:57,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:57,136 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2022-11-25 23:43:57,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:43:57,136 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2022-11-25 23:43:57,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2022-11-25 23:43:57,137 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:57,138 INFO L195 NwaCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:57,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-11-25 23:43:57,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:57,344 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:57,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:57,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 62 times [2022-11-25 23:43:57,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:57,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268822055] [2022-11-25 23:43:57,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:57,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:57,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:44:01,625 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:01,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:44:01,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268822055] [2022-11-25 23:44:01,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268822055] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:44:01,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844017778] [2022-11-25 23:44:01,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:44:01,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:01,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:44:01,627 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:44:01,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-25 23:44:01,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2022-11-25 23:44:01,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:44:01,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-25 23:44:01,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:44:05,915 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3528 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:05,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:44:08,867 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3528 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:08,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844017778] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:44:08,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679256481] [2022-11-25 23:44:08,869 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:44:08,869 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:44:08,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:44:08,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:44:08,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:44:08,972 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:44:10,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94172#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:44:10,081 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:44:10,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:44:10,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 133 [2022-11-25 23:44:10,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432549475] [2022-11-25 23:44:10,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:44:10,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-25 23:44:10,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:44:10,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-25 23:44:10,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4077, Invalid=15945, Unknown=0, NotChecked=0, Total=20022 [2022-11-25 23:44:10,084 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:12,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:44:12,973 INFO L93 Difference]: Finished difference Result 569 states and 615 transitions. [2022-11-25 23:44:12,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-25 23:44:12,973 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2022-11-25 23:44:12,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:44:12,974 INFO L225 Difference]: With dead ends: 569 [2022-11-25 23:44:12,974 INFO L226 Difference]: Without dead ends: 394 [2022-11-25 23:44:12,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 915 GetRequests, 648 SyntacticMatches, 84 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13024 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=7863, Invalid=26177, Unknown=0, NotChecked=0, Total=34040 [2022-11-25 23:44:12,977 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 465 mSDsluCounter, 877 mSDsCounter, 0 mSdLazyCounter, 1014 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 965 SdHoareTripleChecker+Invalid, 1225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 1014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:44:12,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [465 Valid, 965 Invalid, 1225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 1014 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:44:12,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2022-11-25 23:44:13,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 265. [2022-11-25 23:44:13,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.0113636363636365) internal successors, (267), 264 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:13,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 267 transitions. [2022-11-25 23:44:13,017 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 267 transitions. Word has length 262 [2022-11-25 23:44:13,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:44:13,018 INFO L495 AbstractCegarLoop]: Abstraction has 265 states and 267 transitions. [2022-11-25 23:44:13,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:13,018 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 267 transitions. [2022-11-25 23:44:13,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2022-11-25 23:44:13,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:44:13,019 INFO L195 NwaCegarLoop]: trace histogram [44, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:44:13,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-25 23:44:13,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:13,220 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:44:13,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:44:13,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1594950981, now seen corresponding path program 63 times [2022-11-25 23:44:13,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:44:13,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258519233] [2022-11-25 23:44:13,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:44:13,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:44:13,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:44:15,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1806 proven. 3614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:15,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:44:15,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258519233] [2022-11-25 23:44:15,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258519233] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:44:15,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584318148] [2022-11-25 23:44:15,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:44:15,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:15,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:44:15,639 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:44:15,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-11-25 23:44:15,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:44:15,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:44:15,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 981 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-25 23:44:15,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:44:16,194 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1892 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:16,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:44:18,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1892 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:18,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584318148] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:44:18,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1844559718] [2022-11-25 23:44:18,154 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:44:18,154 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:44:18,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:44:18,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:44:18,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:44:18,273 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:44:18,894 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97118#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:44:18,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:44:18,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:44:18,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 49 [2022-11-25 23:44:18,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885697693] [2022-11-25 23:44:18,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:44:18,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-25 23:44:18,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:44:18,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-25 23:44:18,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=2289, Unknown=0, NotChecked=0, Total=3422 [2022-11-25 23:44:18,897 INFO L87 Difference]: Start difference. First operand 265 states and 267 transitions. Second operand has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:20,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:44:20,183 INFO L93 Difference]: Finished difference Result 282 states and 285 transitions. [2022-11-25 23:44:20,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-25 23:44:20,183 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 264 [2022-11-25 23:44:20,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:44:20,185 INFO L225 Difference]: With dead ends: 282 [2022-11-25 23:44:20,185 INFO L226 Difference]: Without dead ends: 280 [2022-11-25 23:44:20,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 924 GetRequests, 737 SyntacticMatches, 84 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5044 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3392, Invalid=7528, Unknown=0, NotChecked=0, Total=10920 [2022-11-25 23:44:20,187 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 279 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:44:20,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 334 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:44:20,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-11-25 23:44:20,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 273. [2022-11-25 23:44:20,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 272 states have (on average 1.0110294117647058) internal successors, (275), 272 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:20,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2022-11-25 23:44:20,245 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 264 [2022-11-25 23:44:20,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:44:20,245 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2022-11-25 23:44:20,245 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:20,245 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2022-11-25 23:44:20,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2022-11-25 23:44:20,247 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:44:20,247 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:44:20,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-11-25 23:44:20,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2022-11-25 23:44:20,455 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:44:20,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:44:20,455 INFO L85 PathProgramCache]: Analyzing trace with hash -1267056085, now seen corresponding path program 64 times [2022-11-25 23:44:20,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:44:20,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986792875] [2022-11-25 23:44:20,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:44:20,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:44:20,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:44:24,992 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3743 proven. 2021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:24,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:44:24,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986792875] [2022-11-25 23:44:24,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986792875] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:44:24,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326934523] [2022-11-25 23:44:24,993 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:44:24,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:24,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:44:24,994 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:44:24,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-25 23:44:25,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:44:25,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 1005 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-25 23:44:25,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:44:29,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3870 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:44:29,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:44:32,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3870 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:44:32,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326934523] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:44:32,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [625027415] [2022-11-25 23:44:32,351 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:44:32,352 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:44:32,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:44:32,352 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:44:32,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:44:32,470 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:44:33,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99808#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:44:33,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:44:33,560 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:44:33,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 90, 90] total 137 [2022-11-25 23:44:33,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566723401] [2022-11-25 23:44:33,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:44:33,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2022-11-25 23:44:33,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:44:33,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2022-11-25 23:44:33,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4305, Invalid=16865, Unknown=0, NotChecked=0, Total=21170 [2022-11-25 23:44:33,564 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:36,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:44:36,503 INFO L93 Difference]: Finished difference Result 588 states and 635 transitions. [2022-11-25 23:44:36,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-25 23:44:36,503 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 272 [2022-11-25 23:44:36,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:44:36,505 INFO L225 Difference]: With dead ends: 588 [2022-11-25 23:44:36,505 INFO L226 Difference]: Without dead ends: 407 [2022-11-25 23:44:36,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 949 GetRequests, 675 SyntacticMatches, 86 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13775 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=8267, Invalid=27643, Unknown=0, NotChecked=0, Total=35910 [2022-11-25 23:44:36,508 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 383 mSDsluCounter, 946 mSDsCounter, 0 mSdLazyCounter, 1084 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 1036 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 1084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:44:36,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [383 Valid, 1036 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 1084 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:44:36,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-11-25 23:44:36,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 275. [2022-11-25 23:44:36,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.010948905109489) internal successors, (277), 274 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:36,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-11-25 23:44:36,546 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 272 [2022-11-25 23:44:36,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:44:36,547 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-11-25 23:44:36,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:36,547 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-11-25 23:44:36,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-11-25 23:44:36,548 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:44:36,548 INFO L195 NwaCegarLoop]: trace histogram [45, 45, 44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:44:36,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2022-11-25 23:44:36,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:36,749 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:44:36,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:44:36,749 INFO L85 PathProgramCache]: Analyzing trace with hash -1664799344, now seen corresponding path program 65 times [2022-11-25 23:44:36,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:44:36,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165730496] [2022-11-25 23:44:36,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:44:36,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:44:36,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:44:41,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3743 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:41,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:44:41,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165730496] [2022-11-25 23:44:41,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165730496] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:44:41,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743313176] [2022-11-25 23:44:41,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:44:41,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:41,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:44:41,667 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:44:41,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-25 23:44:42,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2022-11-25 23:44:42,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:44:42,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 1015 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-25 23:44:42,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:44:46,327 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:46,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:44:49,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:49,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743313176] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:44:49,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425635071] [2022-11-25 23:44:49,549 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:44:49,550 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:44:49,550 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:44:49,550 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:44:49,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:44:49,664 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:44:50,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102948#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:44:50,850 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:44:50,850 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:44:50,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 139 [2022-11-25 23:44:50,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426309813] [2022-11-25 23:44:50,850 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:44:50,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-25 23:44:50,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:44:50,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-25 23:44:50,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4445, Invalid=17311, Unknown=0, NotChecked=0, Total=21756 [2022-11-25 23:44:50,855 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:54,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:44:54,261 INFO L93 Difference]: Finished difference Result 595 states and 643 transitions. [2022-11-25 23:44:54,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-11-25 23:44:54,261 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 274 [2022-11-25 23:44:54,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:44:54,263 INFO L225 Difference]: With dead ends: 595 [2022-11-25 23:44:54,263 INFO L226 Difference]: Without dead ends: 412 [2022-11-25 23:44:54,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 678 SyntacticMatches, 88 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14170 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=8587, Invalid=28469, Unknown=0, NotChecked=0, Total=37056 [2022-11-25 23:44:54,266 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 389 mSDsluCounter, 999 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 1091 SdHoareTripleChecker+Invalid, 1310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:44:54,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 1091 Invalid, 1310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:44:54,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-11-25 23:44:54,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 277. [2022-11-25 23:44:54,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 276 states have (on average 1.0108695652173914) internal successors, (279), 276 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:54,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 279 transitions. [2022-11-25 23:44:54,317 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 279 transitions. Word has length 274 [2022-11-25 23:44:54,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:44:54,317 INFO L495 AbstractCegarLoop]: Abstraction has 277 states and 279 transitions. [2022-11-25 23:44:54,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:44:54,317 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 279 transitions. [2022-11-25 23:44:54,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2022-11-25 23:44:54,318 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:44:54,318 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:44:54,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2022-11-25 23:44:54,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-11-25 23:44:54,519 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:44:54,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:44:54,519 INFO L85 PathProgramCache]: Analyzing trace with hash -1643981899, now seen corresponding path program 66 times [2022-11-25 23:44:54,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:44:54,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958163314] [2022-11-25 23:44:54,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:44:54,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:44:54,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:44:57,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 1980 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:57,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:44:57,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958163314] [2022-11-25 23:44:57,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958163314] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:44:57,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175057088] [2022-11-25 23:44:57,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:44:57,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:44:57,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:44:57,267 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:44:57,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-11-25 23:44:57,464 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:44:57,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:44:57,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-25 23:44:57,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:44:57,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:44:57,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:00,032 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:00,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175057088] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:00,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769535436] [2022-11-25 23:45:00,033 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:45:00,033 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:00,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:00,033 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:00,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:00,138 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:00,767 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '106028#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:45:00,767 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:45:00,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:45:00,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 51 [2022-11-25 23:45:00,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44252456] [2022-11-25 23:45:00,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:45:00,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-25 23:45:00,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:00,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-25 23:45:00,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1228, Invalid=2432, Unknown=0, NotChecked=0, Total=3660 [2022-11-25 23:45:00,771 INFO L87 Difference]: Start difference. First operand 277 states and 279 transitions. Second operand has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:02,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:02,123 INFO L93 Difference]: Finished difference Result 294 states and 297 transitions. [2022-11-25 23:45:02,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-25 23:45:02,124 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 276 [2022-11-25 23:45:02,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:02,126 INFO L225 Difference]: With dead ends: 294 [2022-11-25 23:45:02,126 INFO L226 Difference]: Without dead ends: 292 [2022-11-25 23:45:02,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 771 SyntacticMatches, 88 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5456 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3681, Invalid=8091, Unknown=0, NotChecked=0, Total=11772 [2022-11-25 23:45:02,127 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 289 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:02,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 341 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:45:02,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-11-25 23:45:02,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 285. [2022-11-25 23:45:02,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.0105633802816902) internal successors, (287), 284 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:02,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 287 transitions. [2022-11-25 23:45:02,173 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 287 transitions. Word has length 276 [2022-11-25 23:45:02,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:02,173 INFO L495 AbstractCegarLoop]: Abstraction has 285 states and 287 transitions. [2022-11-25 23:45:02,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:02,174 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 287 transitions. [2022-11-25 23:45:02,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2022-11-25 23:45:02,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:02,175 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:02,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:02,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-11-25 23:45:02,376 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:02,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:02,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1638834331, now seen corresponding path program 67 times [2022-11-25 23:45:02,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:02,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080791976] [2022-11-25 23:45:02,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:02,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:02,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:07,321 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4097 proven. 2205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:07,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:07,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080791976] [2022-11-25 23:45:07,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080791976] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:45:07,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981849260] [2022-11-25 23:45:07,322 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:45:07,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:07,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:07,324 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:07,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-25 23:45:07,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:07,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 1049 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-25 23:45:07,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:11,904 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4230 proven. 2070 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:45:11,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:15,024 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4230 proven. 2070 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:45:15,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981849260] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:15,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [378002623] [2022-11-25 23:45:15,026 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:45:15,026 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:15,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:15,026 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:15,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:15,127 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:16,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '108836#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:45:16,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:45:16,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:45:16,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 94, 94] total 143 [2022-11-25 23:45:16,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561832586] [2022-11-25 23:45:16,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:45:16,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-11-25 23:45:16,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:16,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-11-25 23:45:16,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4683, Invalid=18269, Unknown=0, NotChecked=0, Total=22952 [2022-11-25 23:45:16,237 INFO L87 Difference]: Start difference. First operand 285 states and 287 transitions. Second operand has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:19,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:19,423 INFO L93 Difference]: Finished difference Result 614 states and 663 transitions. [2022-11-25 23:45:19,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-25 23:45:19,423 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 284 [2022-11-25 23:45:19,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:19,424 INFO L225 Difference]: With dead ends: 614 [2022-11-25 23:45:19,424 INFO L226 Difference]: Without dead ends: 425 [2022-11-25 23:45:19,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 991 GetRequests, 705 SyntacticMatches, 90 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14953 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=9009, Invalid=29997, Unknown=0, NotChecked=0, Total=39006 [2022-11-25 23:45:19,426 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 470 mSDsluCounter, 953 mSDsCounter, 0 mSdLazyCounter, 1102 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 470 SdHoareTripleChecker+Valid, 1047 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 1102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:19,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [470 Valid, 1047 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 1102 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:45:19,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-11-25 23:45:19,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 287. [2022-11-25 23:45:19,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.0104895104895104) internal successors, (289), 286 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:19,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 289 transitions. [2022-11-25 23:45:19,480 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 289 transitions. Word has length 284 [2022-11-25 23:45:19,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:19,480 INFO L495 AbstractCegarLoop]: Abstraction has 287 states and 289 transitions. [2022-11-25 23:45:19,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:19,480 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 289 transitions. [2022-11-25 23:45:19,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2022-11-25 23:45:19,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:19,482 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:19,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2022-11-25 23:45:19,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-11-25 23:45:19,689 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:19,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:19,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1952277376, now seen corresponding path program 68 times [2022-11-25 23:45:19,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:19,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912881307] [2022-11-25 23:45:19,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:19,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:19,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:24,371 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4097 proven. 2297 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:24,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:24,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912881307] [2022-11-25 23:45:24,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912881307] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:45:24,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379185105] [2022-11-25 23:45:24,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:45:24,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:24,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:24,373 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:24,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-25 23:45:24,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2022-11-25 23:45:24,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:45:24,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-25 23:45:24,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:29,000 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4232 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:29,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:32,205 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4232 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:32,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379185105] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:32,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635698648] [2022-11-25 23:45:32,206 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:45:32,207 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:32,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:32,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:32,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:32,294 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:33,409 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112114#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:45:33,409 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:45:33,409 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:45:33,409 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 145 [2022-11-25 23:45:33,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108778351] [2022-11-25 23:45:33,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:45:33,410 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2022-11-25 23:45:33,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:33,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2022-11-25 23:45:33,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4829, Invalid=18733, Unknown=0, NotChecked=0, Total=23562 [2022-11-25 23:45:33,412 INFO L87 Difference]: Start difference. First operand 287 states and 289 transitions. Second operand has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:36,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:36,687 INFO L93 Difference]: Finished difference Result 621 states and 671 transitions. [2022-11-25 23:45:36,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-11-25 23:45:36,688 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 286 [2022-11-25 23:45:36,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:36,689 INFO L225 Difference]: With dead ends: 621 [2022-11-25 23:45:36,689 INFO L226 Difference]: Without dead ends: 430 [2022-11-25 23:45:36,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 999 GetRequests, 708 SyntacticMatches, 92 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15364 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=9343, Invalid=30857, Unknown=0, NotChecked=0, Total=40200 [2022-11-25 23:45:36,692 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 405 mSDsluCounter, 1079 mSDsCounter, 0 mSdLazyCounter, 1218 mSolverCounterSat, 181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 1175 SdHoareTripleChecker+Invalid, 1399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 181 IncrementalHoareTripleChecker+Valid, 1218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:36,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [405 Valid, 1175 Invalid, 1399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [181 Valid, 1218 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:45:36,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-11-25 23:45:36,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 289. [2022-11-25 23:45:36,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 288 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:36,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 291 transitions. [2022-11-25 23:45:36,736 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 291 transitions. Word has length 286 [2022-11-25 23:45:36,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:36,736 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 291 transitions. [2022-11-25 23:45:36,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:36,736 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 291 transitions. [2022-11-25 23:45:36,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2022-11-25 23:45:36,737 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:36,737 INFO L195 NwaCegarLoop]: trace histogram [48, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:36,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:36,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:36,938 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:36,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:36,938 INFO L85 PathProgramCache]: Analyzing trace with hash 143078181, now seen corresponding path program 69 times [2022-11-25 23:45:36,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:36,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358210612] [2022-11-25 23:45:36,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:36,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:37,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:39,792 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2162 proven. 4326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:39,792 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:39,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358210612] [2022-11-25 23:45:39,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358210612] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:45:39,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010584583] [2022-11-25 23:45:39,792 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:45:39,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:39,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:39,793 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:39,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-11-25 23:45:39,992 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:45:39,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:45:39,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-25 23:45:40,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:40,390 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:40,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:42,544 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:42,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010584583] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:42,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1852388664] [2022-11-25 23:45:42,546 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:45:42,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:42,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:42,546 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:42,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:42,635 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:43,251 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:45:43,251 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:45:43,251 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:45:43,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 53 [2022-11-25 23:45:43,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544535312] [2022-11-25 23:45:43,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:45:43,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-25 23:45:43,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:43,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-25 23:45:43,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=2579, Unknown=0, NotChecked=0, Total=3906 [2022-11-25 23:45:43,254 INFO L87 Difference]: Start difference. First operand 289 states and 291 transitions. Second operand has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:44,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:44,587 INFO L93 Difference]: Finished difference Result 306 states and 309 transitions. [2022-11-25 23:45:44,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-25 23:45:44,587 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 288 [2022-11-25 23:45:44,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:44,588 INFO L225 Difference]: With dead ends: 306 [2022-11-25 23:45:44,588 INFO L226 Difference]: Without dead ends: 304 [2022-11-25 23:45:44,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 805 SyntacticMatches, 92 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5884 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3982, Invalid=8674, Unknown=0, NotChecked=0, Total=12656 [2022-11-25 23:45:44,590 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 300 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:44,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 431 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:45:44,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-11-25 23:45:44,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 297. [2022-11-25 23:45:44,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.010135135135135) internal successors, (299), 296 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:44,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 299 transitions. [2022-11-25 23:45:44,638 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 299 transitions. Word has length 288 [2022-11-25 23:45:44,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:44,639 INFO L495 AbstractCegarLoop]: Abstraction has 297 states and 299 transitions. [2022-11-25 23:45:44,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:45:44,639 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 299 transitions. [2022-11-25 23:45:44,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2022-11-25 23:45:44,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:44,640 INFO L195 NwaCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:44,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:44,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:44,841 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:44,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:44,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1263833099, now seen corresponding path program 70 times [2022-11-25 23:45:44,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:44,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570947730] [2022-11-25 23:45:44,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:44,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:44,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:49,817 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4467 proven. 2397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:45:49,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:49,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570947730] [2022-11-25 23:45:49,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570947730] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:45:49,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690928062] [2022-11-25 23:45:49,818 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:45:49,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:49,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:49,819 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:49,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-11-25 23:45:50,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:45:50,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-25 23:45:50,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:54,464 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4606 proven. 2256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:45:54,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:57,830 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4606 proven. 2256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:45:57,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690928062] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:57,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [673472079] [2022-11-25 23:45:57,831 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:45:57,831 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:57,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:57,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:57,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:57,922 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:45:59,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118254#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:45:59,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:45:59,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:45:59,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 98, 98] total 149 [2022-11-25 23:45:59,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085286683] [2022-11-25 23:45:59,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:45:59,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2022-11-25 23:45:59,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:59,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2022-11-25 23:45:59,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5077, Invalid=19729, Unknown=0, NotChecked=0, Total=24806 [2022-11-25 23:45:59,075 INFO L87 Difference]: Start difference. First operand 297 states and 299 transitions. Second operand has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:02,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:02,561 INFO L93 Difference]: Finished difference Result 640 states and 691 transitions. [2022-11-25 23:46:02,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-25 23:46:02,561 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 296 [2022-11-25 23:46:02,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:02,562 INFO L225 Difference]: With dead ends: 640 [2022-11-25 23:46:02,562 INFO L226 Difference]: Without dead ends: 443 [2022-11-25 23:46:02,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 735 SyntacticMatches, 94 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16179 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=9783, Invalid=32447, Unknown=0, NotChecked=0, Total=42230 [2022-11-25 23:46:02,565 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 430 mSDsluCounter, 1239 mSDsCounter, 0 mSdLazyCounter, 1381 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 1337 SdHoareTripleChecker+Invalid, 1572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 1381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:02,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [430 Valid, 1337 Invalid, 1572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 1381 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:46:02,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-11-25 23:46:02,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 299. [2022-11-25 23:46:02,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.0100671140939597) internal successors, (301), 298 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:02,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 301 transitions. [2022-11-25 23:46:02,611 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 301 transitions. Word has length 296 [2022-11-25 23:46:02,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:02,611 INFO L495 AbstractCegarLoop]: Abstraction has 299 states and 301 transitions. [2022-11-25 23:46:02,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:02,612 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 301 transitions. [2022-11-25 23:46:02,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2022-11-25 23:46:02,613 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:02,613 INFO L195 NwaCegarLoop]: trace histogram [49, 49, 48, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:02,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:02,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable72 [2022-11-25 23:46:02,815 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:02,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:02,815 INFO L85 PathProgramCache]: Analyzing trace with hash -212018064, now seen corresponding path program 71 times [2022-11-25 23:46:02,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:02,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016179418] [2022-11-25 23:46:02,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:02,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:02,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:07,904 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4467 proven. 2493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:07,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:07,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016179418] [2022-11-25 23:46:07,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016179418] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:07,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549559602] [2022-11-25 23:46:07,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:46:07,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:07,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:07,907 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:07,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-11-25 23:46:08,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2022-11-25 23:46:08,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:08,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-25 23:46:08,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:12,901 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4608 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:12,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:16,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4608 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:16,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549559602] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:16,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [845384110] [2022-11-25 23:46:16,343 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:46:16,343 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:16,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:16,343 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:16,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:16,443 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:17,580 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '121670#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:17,580 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:17,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:17,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 151 [2022-11-25 23:46:17,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423868978] [2022-11-25 23:46:17,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:17,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-11-25 23:46:17,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:17,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-11-25 23:46:17,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5229, Invalid=20211, Unknown=0, NotChecked=0, Total=25440 [2022-11-25 23:46:17,583 INFO L87 Difference]: Start difference. First operand 299 states and 301 transitions. Second operand has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:21,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:21,192 INFO L93 Difference]: Finished difference Result 647 states and 699 transitions. [2022-11-25 23:46:21,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-25 23:46:21,192 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 298 [2022-11-25 23:46:21,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:21,193 INFO L225 Difference]: With dead ends: 647 [2022-11-25 23:46:21,193 INFO L226 Difference]: Without dead ends: 448 [2022-11-25 23:46:21,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1041 GetRequests, 738 SyntacticMatches, 96 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16606 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=10131, Invalid=33341, Unknown=0, NotChecked=0, Total=43472 [2022-11-25 23:46:21,197 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 479 mSDsluCounter, 1091 mSDsCounter, 0 mSdLazyCounter, 1244 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 479 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 1244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:21,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [479 Valid, 1191 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 1244 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:46:21,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2022-11-25 23:46:21,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 301. [2022-11-25 23:46:21,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 300 states have (on average 1.01) internal successors, (303), 300 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:21,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 303 transitions. [2022-11-25 23:46:21,267 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 303 transitions. Word has length 298 [2022-11-25 23:46:21,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:21,267 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 303 transitions. [2022-11-25 23:46:21,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:21,268 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 303 transitions. [2022-11-25 23:46:21,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2022-11-25 23:46:21,269 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:21,269 INFO L195 NwaCegarLoop]: trace histogram [50, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:21,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:21,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2022-11-25 23:46:21,469 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:21,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:21,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1165778027, now seen corresponding path program 72 times [2022-11-25 23:46:21,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:21,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882608627] [2022-11-25 23:46:21,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:21,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:21,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:24,665 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2352 proven. 4706 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:24,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:24,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882608627] [2022-11-25 23:46:24,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882608627] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:24,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474588115] [2022-11-25 23:46:24,666 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:46:24,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:24,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:24,671 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:24,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-11-25 23:46:24,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:46:24,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:24,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-25 23:46:24,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:25,305 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:25,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:27,593 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:27,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474588115] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:27,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1540319918] [2022-11-25 23:46:27,594 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:46:27,594 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:27,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:27,595 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:27,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:27,699 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:28,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125018#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:28,322 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:28,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:28,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 55 [2022-11-25 23:46:28,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990511278] [2022-11-25 23:46:28,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:28,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-25 23:46:28,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:28,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-25 23:46:28,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=2730, Unknown=0, NotChecked=0, Total=4160 [2022-11-25 23:46:28,325 INFO L87 Difference]: Start difference. First operand 301 states and 303 transitions. Second operand has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:29,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:29,750 INFO L93 Difference]: Finished difference Result 318 states and 321 transitions. [2022-11-25 23:46:29,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-11-25 23:46:29,751 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 300 [2022-11-25 23:46:29,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:29,753 INFO L225 Difference]: With dead ends: 318 [2022-11-25 23:46:29,753 INFO L226 Difference]: Without dead ends: 316 [2022-11-25 23:46:29,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 839 SyntacticMatches, 96 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6328 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=4295, Invalid=9277, Unknown=0, NotChecked=0, Total=13572 [2022-11-25 23:46:29,754 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 161 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 445 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:29,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 445 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:46:29,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2022-11-25 23:46:29,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 309. [2022-11-25 23:46:29,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 1.0097402597402598) internal successors, (311), 308 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:29,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2022-11-25 23:46:29,801 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 300 [2022-11-25 23:46:29,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:29,801 INFO L495 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2022-11-25 23:46:29,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:29,801 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2022-11-25 23:46:29,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2022-11-25 23:46:29,802 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:29,802 INFO L195 NwaCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:29,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:30,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:30,003 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:30,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:30,003 INFO L85 PathProgramCache]: Analyzing trace with hash 265392251, now seen corresponding path program 73 times [2022-11-25 23:46:30,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:30,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240011658] [2022-11-25 23:46:30,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:30,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:30,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:35,372 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4853 proven. 2597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:35,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:35,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240011658] [2022-11-25 23:46:35,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240011658] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:35,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993498831] [2022-11-25 23:46:35,373 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:46:35,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:35,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:35,374 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:35,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-11-25 23:46:35,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:35,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-25 23:46:35,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:40,341 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:46:40,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:43,938 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:46:43,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993498831] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:43,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150251498] [2022-11-25 23:46:43,939 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:46:43,939 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:43,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:43,939 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:43,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:44,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:45,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128062#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:45,202 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:45,202 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:45,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 102, 102] total 155 [2022-11-25 23:46:45,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270663759] [2022-11-25 23:46:45,202 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:45,203 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-11-25 23:46:45,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:45,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-11-25 23:46:45,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5487, Invalid=21245, Unknown=0, NotChecked=0, Total=26732 [2022-11-25 23:46:45,205 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:48,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:48,975 INFO L93 Difference]: Finished difference Result 666 states and 719 transitions. [2022-11-25 23:46:48,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-25 23:46:48,976 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 308 [2022-11-25 23:46:48,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:48,978 INFO L225 Difference]: With dead ends: 666 [2022-11-25 23:46:48,978 INFO L226 Difference]: Without dead ends: 461 [2022-11-25 23:46:48,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1075 GetRequests, 765 SyntacticMatches, 98 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17453 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=10589, Invalid=34993, Unknown=0, NotChecked=0, Total=45582 [2022-11-25 23:46:48,981 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 440 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1353 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 1549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 1353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:48,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [440 Valid, 1297 Invalid, 1549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 1353 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 23:46:48,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2022-11-25 23:46:49,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 311. [2022-11-25 23:46:49,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 1.0096774193548388) internal successors, (313), 310 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:49,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 313 transitions. [2022-11-25 23:46:49,031 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 313 transitions. Word has length 308 [2022-11-25 23:46:49,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:49,031 INFO L495 AbstractCegarLoop]: Abstraction has 311 states and 313 transitions. [2022-11-25 23:46:49,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:49,031 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 313 transitions. [2022-11-25 23:46:49,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2022-11-25 23:46:49,033 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:49,033 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 50, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:49,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:49,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:49,235 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:49,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:49,235 INFO L85 PathProgramCache]: Analyzing trace with hash -344363680, now seen corresponding path program 74 times [2022-11-25 23:46:49,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:49,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814744505] [2022-11-25 23:46:49,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:49,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:49,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:55,175 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 4853 proven. 2697 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:55,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:55,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814744505] [2022-11-25 23:46:55,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814744505] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:55,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690232088] [2022-11-25 23:46:55,176 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:46:55,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:55,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:55,177 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:55,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-11-25 23:46:55,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2022-11-25 23:46:55,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:55,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 1147 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-25 23:46:55,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:00,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5000 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:00,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5000 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:04,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690232088] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:04,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731501922] [2022-11-25 23:47:04,966 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:47:04,966 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:04,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:04,967 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:04,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:05,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:06,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '131616#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:06,350 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:06,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:06,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 157 [2022-11-25 23:47:06,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235531523] [2022-11-25 23:47:06,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:06,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 157 states [2022-11-25 23:47:06,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:06,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 157 interpolants. [2022-11-25 23:47:06,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5645, Invalid=21745, Unknown=0, NotChecked=0, Total=27390 [2022-11-25 23:47:06,354 INFO L87 Difference]: Start difference. First operand 311 states and 313 transitions. Second operand has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:10,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:10,622 INFO L93 Difference]: Finished difference Result 673 states and 727 transitions. [2022-11-25 23:47:10,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-25 23:47:10,622 INFO L78 Accepts]: Start accepts. Automaton has has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 310 [2022-11-25 23:47:10,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:10,623 INFO L225 Difference]: With dead ends: 673 [2022-11-25 23:47:10,623 INFO L226 Difference]: Without dead ends: 466 [2022-11-25 23:47:10,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1083 GetRequests, 768 SyntacticMatches, 100 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17896 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=10951, Invalid=35921, Unknown=0, NotChecked=0, Total=46872 [2022-11-25 23:47:10,629 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 562 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 1329 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1264 SdHoareTripleChecker+Invalid, 1586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 1329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:10,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [562 Valid, 1264 Invalid, 1586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 1329 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:47:10,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-11-25 23:47:10,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 313. [2022-11-25 23:47:10,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 312 states have (on average 1.0096153846153846) internal successors, (315), 312 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:10,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 315 transitions. [2022-11-25 23:47:10,689 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 315 transitions. Word has length 310 [2022-11-25 23:47:10,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:10,689 INFO L495 AbstractCegarLoop]: Abstraction has 313 states and 315 transitions. [2022-11-25 23:47:10,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:10,690 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 315 transitions. [2022-11-25 23:47:10,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2022-11-25 23:47:10,691 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:10,691 INFO L195 NwaCegarLoop]: trace histogram [52, 51, 51, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:10,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:10,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2022-11-25 23:47:10,892 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:10,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:10,892 INFO L85 PathProgramCache]: Analyzing trace with hash 2090706181, now seen corresponding path program 75 times [2022-11-25 23:47:10,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:10,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710289744] [2022-11-25 23:47:10,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:10,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:11,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:14,395 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2550 proven. 5102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:14,395 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:14,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710289744] [2022-11-25 23:47:14,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710289744] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:14,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269683546] [2022-11-25 23:47:14,399 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:47:14,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:14,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:14,400 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:14,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-11-25 23:47:14,633 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:47:14,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:14,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 1157 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-25 23:47:14,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:15,089 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2652 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:15,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:17,686 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2652 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:17,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269683546] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:17,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1454989116] [2022-11-25 23:47:17,687 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:47:17,687 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:17,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:17,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:17,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:17,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:18,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '135098#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:18,451 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:18,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:18,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 57 [2022-11-25 23:47:18,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969362119] [2022-11-25 23:47:18,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:18,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-25 23:47:18,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:18,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-25 23:47:18,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1537, Invalid=2885, Unknown=0, NotChecked=0, Total=4422 [2022-11-25 23:47:18,454 INFO L87 Difference]: Start difference. First operand 313 states and 315 transitions. Second operand has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:20,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:20,078 INFO L93 Difference]: Finished difference Result 330 states and 333 transitions. [2022-11-25 23:47:20,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-11-25 23:47:20,079 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 312 [2022-11-25 23:47:20,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:20,081 INFO L225 Difference]: With dead ends: 330 [2022-11-25 23:47:20,081 INFO L226 Difference]: Without dead ends: 328 [2022-11-25 23:47:20,082 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1092 GetRequests, 873 SyntacticMatches, 100 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6788 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4620, Invalid=9900, Unknown=0, NotChecked=0, Total=14520 [2022-11-25 23:47:20,082 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 171 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:20,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 517 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:47:20,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2022-11-25 23:47:20,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 321. [2022-11-25 23:47:20,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 320 states have (on average 1.009375) internal successors, (323), 320 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:20,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 323 transitions. [2022-11-25 23:47:20,138 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 323 transitions. Word has length 312 [2022-11-25 23:47:20,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:20,138 INFO L495 AbstractCegarLoop]: Abstraction has 321 states and 323 transitions. [2022-11-25 23:47:20,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:20,138 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 323 transitions. [2022-11-25 23:47:20,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2022-11-25 23:47:20,139 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:20,139 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:20,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:20,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:20,340 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:20,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:20,340 INFO L85 PathProgramCache]: Analyzing trace with hash 978002411, now seen corresponding path program 76 times [2022-11-25 23:47:20,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:20,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011782940] [2022-11-25 23:47:20,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:20,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:20,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:26,714 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5255 proven. 2805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:26,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:26,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011782940] [2022-11-25 23:47:26,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011782940] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:26,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652992473] [2022-11-25 23:47:26,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:47:26,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:26,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:26,716 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:26,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-11-25 23:47:26,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:26,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-25 23:47:26,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:32,687 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5406 proven. 2652 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:47:32,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:36,940 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5406 proven. 2652 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:47:36,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652992473] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:36,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016049001] [2022-11-25 23:47:36,942 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:47:36,942 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:36,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:36,942 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:36,942 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:37,041 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:38,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138260#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:38,386 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:38,386 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:38,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 106, 106] total 161 [2022-11-25 23:47:38,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469897129] [2022-11-25 23:47:38,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:38,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2022-11-25 23:47:38,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:38,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2022-11-25 23:47:38,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5913, Invalid=22817, Unknown=0, NotChecked=0, Total=28730 [2022-11-25 23:47:38,391 INFO L87 Difference]: Start difference. First operand 321 states and 323 transitions. Second operand has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:42,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:42,830 INFO L93 Difference]: Finished difference Result 692 states and 747 transitions. [2022-11-25 23:47:42,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-11-25 23:47:42,830 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 320 [2022-11-25 23:47:42,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:42,831 INFO L225 Difference]: With dead ends: 692 [2022-11-25 23:47:42,831 INFO L226 Difference]: Without dead ends: 479 [2022-11-25 23:47:42,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1117 GetRequests, 795 SyntacticMatches, 102 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18775 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=11427, Invalid=37635, Unknown=0, NotChecked=0, Total=49062 [2022-11-25 23:47:42,835 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 541 mSDsluCounter, 1038 mSDsCounter, 0 mSdLazyCounter, 1207 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 541 SdHoareTripleChecker+Valid, 1144 SdHoareTripleChecker+Invalid, 1453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 1207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:42,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [541 Valid, 1144 Invalid, 1453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 1207 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:47:42,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2022-11-25 23:47:42,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 323. [2022-11-25 23:47:42,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.0093167701863355) internal successors, (325), 322 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:42,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2022-11-25 23:47:42,894 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 320 [2022-11-25 23:47:42,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:42,894 INFO L495 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2022-11-25 23:47:42,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:42,895 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2022-11-25 23:47:42,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2022-11-25 23:47:42,896 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:42,897 INFO L195 NwaCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:42,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:43,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2022-11-25 23:47:43,097 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:43,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:43,098 INFO L85 PathProgramCache]: Analyzing trace with hash -935473328, now seen corresponding path program 77 times [2022-11-25 23:47:43,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:43,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845591159] [2022-11-25 23:47:43,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:43,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:43,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:49,524 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5255 proven. 2909 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:49,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:49,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845591159] [2022-11-25 23:47:49,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845591159] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:49,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953804129] [2022-11-25 23:47:49,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:47:49,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:49,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:49,525 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:49,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-11-25 23:47:49,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2022-11-25 23:47:49,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:49,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-25 23:47:49,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:55,500 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:55,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:59,556 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:59,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953804129] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:59,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153908315] [2022-11-25 23:47:59,558 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:47:59,558 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:59,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:59,558 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:59,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:59,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:00,980 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141952#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:00,980 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:00,980 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:48:00,980 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 163 [2022-11-25 23:48:00,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911083462] [2022-11-25 23:48:00,980 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:00,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-11-25 23:48:00,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:00,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-11-25 23:48:00,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6077, Invalid=23335, Unknown=0, NotChecked=0, Total=29412 [2022-11-25 23:48:00,984 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:05,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:48:05,698 INFO L93 Difference]: Finished difference Result 699 states and 755 transitions. [2022-11-25 23:48:05,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-11-25 23:48:05,698 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 322 [2022-11-25 23:48:05,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:48:05,699 INFO L225 Difference]: With dead ends: 699 [2022-11-25 23:48:05,699 INFO L226 Difference]: Without dead ends: 484 [2022-11-25 23:48:05,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1125 GetRequests, 798 SyntacticMatches, 104 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19234 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=11803, Invalid=38597, Unknown=0, NotChecked=0, Total=50400 [2022-11-25 23:48:05,701 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 591 mSDsluCounter, 1113 mSDsCounter, 0 mSdLazyCounter, 1284 mSolverCounterSat, 271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 591 SdHoareTripleChecker+Valid, 1221 SdHoareTripleChecker+Invalid, 1555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 1284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:48:05,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [591 Valid, 1221 Invalid, 1555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 1284 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:48:05,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2022-11-25 23:48:05,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 325. [2022-11-25 23:48:05,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 1.0092592592592593) internal successors, (327), 324 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:05,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 327 transitions. [2022-11-25 23:48:05,780 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 327 transitions. Word has length 322 [2022-11-25 23:48:05,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:48:05,780 INFO L495 AbstractCegarLoop]: Abstraction has 325 states and 327 transitions. [2022-11-25 23:48:05,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:05,781 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 327 transitions. [2022-11-25 23:48:05,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2022-11-25 23:48:05,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:48:05,783 INFO L195 NwaCegarLoop]: trace histogram [54, 53, 53, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:48:05,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2022-11-25 23:48:05,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-11-25 23:48:05,983 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:48:05,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:48:05,983 INFO L85 PathProgramCache]: Analyzing trace with hash -1539655819, now seen corresponding path program 78 times [2022-11-25 23:48:05,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:48:05,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718075984] [2022-11-25 23:48:05,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:48:05,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:48:06,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:48:10,121 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2756 proven. 5514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:10,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:48:10,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718075984] [2022-11-25 23:48:10,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718075984] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:48:10,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298142779] [2022-11-25 23:48:10,122 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:48:10,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:48:10,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:48:10,123 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:48:10,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-11-25 23:48:10,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:48:10,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:48:10,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-25 23:48:10,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:48:10,941 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:10,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:48:13,879 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:13,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298142779] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:48:13,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [401483539] [2022-11-25 23:48:13,880 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:48:13,880 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:48:13,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:48:13,881 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:48:13,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:48:13,981 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:14,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '145568#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:14,710 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:14,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:48:14,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 59 [2022-11-25 23:48:14,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323455175] [2022-11-25 23:48:14,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:14,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-25 23:48:14,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:14,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-25 23:48:14,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1648, Invalid=3044, Unknown=0, NotChecked=0, Total=4692 [2022-11-25 23:48:14,714 INFO L87 Difference]: Start difference. First operand 325 states and 327 transitions. Second operand has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:16,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:48:16,571 INFO L93 Difference]: Finished difference Result 342 states and 345 transitions. [2022-11-25 23:48:16,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-25 23:48:16,571 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 324 [2022-11-25 23:48:16,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:48:16,574 INFO L225 Difference]: With dead ends: 342 [2022-11-25 23:48:16,574 INFO L226 Difference]: Without dead ends: 340 [2022-11-25 23:48:16,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1134 GetRequests, 907 SyntacticMatches, 104 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7264 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4957, Invalid=10543, Unknown=0, NotChecked=0, Total=15500 [2022-11-25 23:48:16,575 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 174 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:48:16,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 528 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:48:16,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-25 23:48:16,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 333. [2022-11-25 23:48:16,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 1.0090361445783131) internal successors, (335), 332 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:16,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 335 transitions. [2022-11-25 23:48:16,641 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 335 transitions. Word has length 324 [2022-11-25 23:48:16,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:48:16,641 INFO L495 AbstractCegarLoop]: Abstraction has 333 states and 335 transitions. [2022-11-25 23:48:16,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:16,641 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 335 transitions. [2022-11-25 23:48:16,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2022-11-25 23:48:16,643 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:48:16,643 INFO L195 NwaCegarLoop]: trace histogram [55, 54, 54, 54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:48:16,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2022-11-25 23:48:16,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:48:16,844 INFO L420 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:48:16,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:48:16,844 INFO L85 PathProgramCache]: Analyzing trace with hash 581354587, now seen corresponding path program 79 times [2022-11-25 23:48:16,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:48:16,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261116783] [2022-11-25 23:48:16,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:48:16,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:48:16,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:48:24,093 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5673 proven. 3021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:24,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:48:24,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261116783] [2022-11-25 23:48:24,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261116783] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:48:24,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55140227] [2022-11-25 23:48:24,093 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:48:24,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:48:24,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:48:24,095 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:48:24,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-11-25 23:48:24,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:48:24,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 1225 conjuncts, 110 conjunts are in the unsatisfiable core [2022-11-25 23:48:24,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:48:30,217 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5830 proven. 2862 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:48:30,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:48:34,549 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5830 proven. 2862 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:48:34,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55140227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:48:34,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [384024392] [2022-11-25 23:48:34,550 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:48:34,551 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:48:34,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:48:34,551 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:48:34,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:48:34,648 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:35,910 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '148848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:35,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:35,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:48:35,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 110, 110] total 167 [2022-11-25 23:48:35,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473772477] [2022-11-25 23:48:35,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:35,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2022-11-25 23:48:35,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:35,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2022-11-25 23:48:35,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6355, Invalid=24445, Unknown=0, NotChecked=0, Total=30800 [2022-11-25 23:48:35,917 INFO L87 Difference]: Start difference. First operand 333 states and 335 transitions. Second operand has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:40,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:48:40,458 INFO L93 Difference]: Finished difference Result 718 states and 775 transitions. [2022-11-25 23:48:40,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-11-25 23:48:40,458 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 332 [2022-11-25 23:48:40,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:48:40,459 INFO L225 Difference]: With dead ends: 718 [2022-11-25 23:48:40,460 INFO L226 Difference]: Without dead ends: 497 [2022-11-25 23:48:40,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 825 SyntacticMatches, 106 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20145 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=12297, Invalid=40373, Unknown=0, NotChecked=0, Total=52670 [2022-11-25 23:48:40,463 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 583 mSDsluCounter, 1150 mSDsCounter, 0 mSdLazyCounter, 1324 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 1590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 1324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:48:40,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [583 Valid, 1260 Invalid, 1590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 1324 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:48:40,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2022-11-25 23:48:40,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 335. [2022-11-25 23:48:40,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.0089820359281436) internal successors, (337), 334 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:40,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 337 transitions. [2022-11-25 23:48:40,531 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 337 transitions. Word has length 332 [2022-11-25 23:48:40,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:48:40,532 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 337 transitions. [2022-11-25 23:48:40,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:48:40,532 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 337 transitions. [2022-11-25 23:48:40,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2022-11-25 23:48:40,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:48:40,533 INFO L195 NwaCegarLoop]: trace histogram [55, 55, 54, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:48:40,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2022-11-25 23:48:40,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:48:40,734 INFO L420 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:48:40,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:48:40,734 INFO L85 PathProgramCache]: Analyzing trace with hash -89161152, now seen corresponding path program 80 times [2022-11-25 23:48:40,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:48:40,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986036145] [2022-11-25 23:48:40,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:48:40,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:48:40,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:48:47,447 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5673 proven. 3129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:47,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:48:47,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986036145] [2022-11-25 23:48:47,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986036145] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:48:47,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864630284] [2022-11-25 23:48:47,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:48:47,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:48:47,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:48:47,448 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:48:47,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-11-25 23:48:47,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2022-11-25 23:48:47,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:48:47,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 1235 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-25 23:48:47,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:48:53,819 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5832 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:53,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:48:58,142 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5832 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:48:58,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1864630284] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:48:58,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [222510645] [2022-11-25 23:48:58,143 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:48:58,143 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:48:58,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:48:58,143 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:48:58,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:48:58,242 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:59,520 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152678#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:59,520 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:59,520 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:48:59,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 112, 112] total 169 [2022-11-25 23:48:59,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017014570] [2022-11-25 23:48:59,521 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:59,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2022-11-25 23:48:59,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:59,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2022-11-25 23:48:59,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6525, Invalid=24981, Unknown=0, NotChecked=0, Total=31506 [2022-11-25 23:48:59,525 INFO L87 Difference]: Start difference. First operand 335 states and 337 transitions. Second operand has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:04,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:04,071 INFO L93 Difference]: Finished difference Result 725 states and 783 transitions. [2022-11-25 23:49:04,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-11-25 23:49:04,072 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 334 [2022-11-25 23:49:04,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:04,073 INFO L225 Difference]: With dead ends: 725 [2022-11-25 23:49:04,073 INFO L226 Difference]: Without dead ends: 502 [2022-11-25 23:49:04,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1167 GetRequests, 828 SyntacticMatches, 108 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20620 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=12687, Invalid=41369, Unknown=0, NotChecked=0, Total=54056 [2022-11-25 23:49:04,077 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 521 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1371 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 1307 SdHoareTripleChecker+Invalid, 1605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 1371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:04,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [521 Valid, 1307 Invalid, 1605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 1371 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:49:04,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-11-25 23:49:04,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 337. [2022-11-25 23:49:04,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.0089285714285714) internal successors, (339), 336 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:04,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 339 transitions. [2022-11-25 23:49:04,134 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 339 transitions. Word has length 334 [2022-11-25 23:49:04,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:04,134 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 339 transitions. [2022-11-25 23:49:04,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:04,135 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 339 transitions. [2022-11-25 23:49:04,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2022-11-25 23:49:04,136 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:04,136 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:04,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:04,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:04,337 INFO L420 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:04,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:04,337 INFO L85 PathProgramCache]: Analyzing trace with hash -209691931, now seen corresponding path program 81 times [2022-11-25 23:49:04,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:04,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968437738] [2022-11-25 23:49:04,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:04,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:04,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:08,286 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 2970 proven. 5942 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:08,286 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:08,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968437738] [2022-11-25 23:49:08,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968437738] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:49:08,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97087648] [2022-11-25 23:49:08,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:49:08,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:08,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:08,290 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:08,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-11-25 23:49:08,528 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:49:08,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:49:08,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-25 23:49:08,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:08,990 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:08,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:11,829 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:11,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97087648] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:11,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321599296] [2022-11-25 23:49:11,830 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:49:11,830 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:11,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:11,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:11,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:11,925 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:12,592 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156428#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:49:12,592 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:49:12,592 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:49:12,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 61 [2022-11-25 23:49:12,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395740192] [2022-11-25 23:49:12,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:49:12,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-25 23:49:12,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:49:12,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-25 23:49:12,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1763, Invalid=3207, Unknown=0, NotChecked=0, Total=4970 [2022-11-25 23:49:12,594 INFO L87 Difference]: Start difference. First operand 337 states and 339 transitions. Second operand has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:14,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:14,274 INFO L93 Difference]: Finished difference Result 354 states and 357 transitions. [2022-11-25 23:49:14,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-25 23:49:14,274 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 336 [2022-11-25 23:49:14,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:14,275 INFO L225 Difference]: With dead ends: 354 [2022-11-25 23:49:14,275 INFO L226 Difference]: Without dead ends: 352 [2022-11-25 23:49:14,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 941 SyntacticMatches, 108 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7756 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=5306, Invalid=11206, Unknown=0, NotChecked=0, Total=16512 [2022-11-25 23:49:14,277 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 181 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:14,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 515 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:49:14,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-11-25 23:49:14,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 345. [2022-11-25 23:49:14,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.0087209302325582) internal successors, (347), 344 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:14,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 347 transitions. [2022-11-25 23:49:14,341 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 347 transitions. Word has length 336 [2022-11-25 23:49:14,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:14,341 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 347 transitions. [2022-11-25 23:49:14,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:14,341 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 347 transitions. [2022-11-25 23:49:14,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2022-11-25 23:49:14,343 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:14,343 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 56, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:14,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:14,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2022-11-25 23:49:14,544 INFO L420 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:14,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:14,544 INFO L85 PathProgramCache]: Analyzing trace with hash -846596149, now seen corresponding path program 82 times [2022-11-25 23:49:14,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:14,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180249370] [2022-11-25 23:49:14,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:14,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:14,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:21,340 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6107 proven. 3245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:21,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:21,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180249370] [2022-11-25 23:49:21,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180249370] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:49:21,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831044925] [2022-11-25 23:49:21,341 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:49:21,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:21,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:21,342 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:21,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-11-25 23:49:21,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:21,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 1269 conjuncts, 114 conjunts are in the unsatisfiable core [2022-11-25 23:49:21,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:27,429 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6270 proven. 3080 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:49:27,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:31,850 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6270 proven. 3080 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:49:31,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831044925] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:31,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226303759] [2022-11-25 23:49:31,852 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:49:31,852 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:31,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:31,852 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:31,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:31,966 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:33,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '159826#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:49:33,245 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:49:33,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:49:33,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 114, 114] total 173 [2022-11-25 23:49:33,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391529593] [2022-11-25 23:49:33,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:49:33,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2022-11-25 23:49:33,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:49:33,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2022-11-25 23:49:33,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6813, Invalid=26129, Unknown=0, NotChecked=0, Total=32942 [2022-11-25 23:49:33,250 INFO L87 Difference]: Start difference. First operand 345 states and 347 transitions. Second operand has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:37,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:37,963 INFO L93 Difference]: Finished difference Result 744 states and 803 transitions. [2022-11-25 23:49:37,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-25 23:49:37,963 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 344 [2022-11-25 23:49:37,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:37,964 INFO L225 Difference]: With dead ends: 744 [2022-11-25 23:49:37,964 INFO L226 Difference]: Without dead ends: 515 [2022-11-25 23:49:37,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1201 GetRequests, 855 SyntacticMatches, 110 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21563 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=13199, Invalid=43207, Unknown=0, NotChecked=0, Total=56406 [2022-11-25 23:49:37,967 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 636 mSDsluCounter, 1247 mSDsCounter, 0 mSdLazyCounter, 1440 mSolverCounterSat, 291 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 636 SdHoareTripleChecker+Valid, 1361 SdHoareTripleChecker+Invalid, 1731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 291 IncrementalHoareTripleChecker+Valid, 1440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:37,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [636 Valid, 1361 Invalid, 1731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [291 Valid, 1440 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:49:37,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2022-11-25 23:49:38,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 347. [2022-11-25 23:49:38,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 346 states have (on average 1.0086705202312138) internal successors, (349), 346 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:38,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 349 transitions. [2022-11-25 23:49:38,029 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 349 transitions. Word has length 344 [2022-11-25 23:49:38,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:38,029 INFO L495 AbstractCegarLoop]: Abstraction has 347 states and 349 transitions. [2022-11-25 23:49:38,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:38,030 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 349 transitions. [2022-11-25 23:49:38,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2022-11-25 23:49:38,031 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:38,031 INFO L195 NwaCegarLoop]: trace histogram [57, 57, 56, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:38,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:38,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable84 [2022-11-25 23:49:38,232 INFO L420 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:38,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:38,232 INFO L85 PathProgramCache]: Analyzing trace with hash -258734544, now seen corresponding path program 83 times [2022-11-25 23:49:38,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:38,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750363898] [2022-11-25 23:49:38,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:38,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:38,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:45,212 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6107 proven. 3357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:45,213 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:45,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750363898] [2022-11-25 23:49:45,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750363898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:49:45,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048445258] [2022-11-25 23:49:45,213 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:49:45,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:45,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:45,215 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:45,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-11-25 23:49:45,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2022-11-25 23:49:45,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:49:45,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 1279 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-25 23:49:45,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:51,718 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6272 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:51,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:56,307 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6272 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:56,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048445258] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:56,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [449467175] [2022-11-25 23:49:56,309 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:49:56,309 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:56,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:56,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:56,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:56,426 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:57,722 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163794#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:49:57,723 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:49:57,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:49:57,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 116, 116] total 175 [2022-11-25 23:49:57,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14956179] [2022-11-25 23:49:57,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:49:57,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 175 states [2022-11-25 23:49:57,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:49:57,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2022-11-25 23:49:57,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6989, Invalid=26683, Unknown=0, NotChecked=0, Total=33672 [2022-11-25 23:49:57,728 INFO L87 Difference]: Start difference. First operand 347 states and 349 transitions. Second operand has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:02,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:50:02,728 INFO L93 Difference]: Finished difference Result 751 states and 811 transitions. [2022-11-25 23:50:02,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-11-25 23:50:02,728 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 346 [2022-11-25 23:50:02,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:50:02,730 INFO L225 Difference]: With dead ends: 751 [2022-11-25 23:50:02,731 INFO L226 Difference]: Without dead ends: 520 [2022-11-25 23:50:02,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 858 SyntacticMatches, 112 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22054 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=13603, Invalid=44237, Unknown=0, NotChecked=0, Total=57840 [2022-11-25 23:50:02,735 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 592 mSDsluCounter, 1330 mSDsCounter, 0 mSdLazyCounter, 1508 mSolverCounterSat, 269 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 592 SdHoareTripleChecker+Valid, 1446 SdHoareTripleChecker+Invalid, 1777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 269 IncrementalHoareTripleChecker+Valid, 1508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:50:02,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [592 Valid, 1446 Invalid, 1777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [269 Valid, 1508 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:50:02,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-11-25 23:50:02,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 349. [2022-11-25 23:50:02,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.0086206896551724) internal successors, (351), 348 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:02,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 351 transitions. [2022-11-25 23:50:02,799 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 351 transitions. Word has length 346 [2022-11-25 23:50:02,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:50:02,799 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 351 transitions. [2022-11-25 23:50:02,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:02,800 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 351 transitions. [2022-11-25 23:50:02,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2022-11-25 23:50:02,801 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:50:02,801 INFO L195 NwaCegarLoop]: trace histogram [58, 57, 57, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:50:02,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2022-11-25 23:50:03,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:03,002 INFO L420 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:50:03,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:50:03,002 INFO L85 PathProgramCache]: Analyzing trace with hash 2035552085, now seen corresponding path program 84 times [2022-11-25 23:50:03,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:50:03,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540795637] [2022-11-25 23:50:03,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:50:03,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:50:03,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:07,523 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3192 proven. 6386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:07,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:50:07,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540795637] [2022-11-25 23:50:07,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540795637] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:50:07,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798919110] [2022-11-25 23:50:07,524 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:50:07,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:07,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:50:07,527 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:50:07,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-11-25 23:50:07,763 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:50:07,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:50:07,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 1289 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-25 23:50:07,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:50:08,260 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:08,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:50:11,304 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:11,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798919110] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:50:11,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104602958] [2022-11-25 23:50:11,306 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:50:11,306 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:50:11,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:50:11,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:50:11,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:50:11,396 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:50:12,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '167678#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:50:12,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:12,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:50:12,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 63 [2022-11-25 23:50:12,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589899097] [2022-11-25 23:50:12,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:12,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-25 23:50:12,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:12,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-25 23:50:12,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1882, Invalid=3374, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 23:50:12,061 INFO L87 Difference]: Start difference. First operand 349 states and 351 transitions. Second operand has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:13,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:50:13,881 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2022-11-25 23:50:13,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-11-25 23:50:13,882 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 348 [2022-11-25 23:50:13,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:50:13,883 INFO L225 Difference]: With dead ends: 366 [2022-11-25 23:50:13,883 INFO L226 Difference]: Without dead ends: 364 [2022-11-25 23:50:13,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1218 GetRequests, 975 SyntacticMatches, 112 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8264 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5667, Invalid=11889, Unknown=0, NotChecked=0, Total=17556 [2022-11-25 23:50:13,885 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 186 mSDsluCounter, 522 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:50:13,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 588 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:50:13,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2022-11-25 23:50:13,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 357. [2022-11-25 23:50:13,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 356 states have (on average 1.0084269662921348) internal successors, (359), 356 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:13,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 359 transitions. [2022-11-25 23:50:13,947 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 359 transitions. Word has length 348 [2022-11-25 23:50:13,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:50:13,947 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 359 transitions. [2022-11-25 23:50:13,947 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:13,948 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 359 transitions. [2022-11-25 23:50:13,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2022-11-25 23:50:13,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:50:13,949 INFO L195 NwaCegarLoop]: trace histogram [59, 58, 58, 58, 58, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:50:13,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2022-11-25 23:50:14,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:14,149 INFO L420 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:50:14,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:50:14,150 INFO L85 PathProgramCache]: Analyzing trace with hash -866501573, now seen corresponding path program 85 times [2022-11-25 23:50:14,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:50:14,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926194103] [2022-11-25 23:50:14,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:50:14,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:50:14,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:21,627 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6557 proven. 3477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:21,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:50:21,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926194103] [2022-11-25 23:50:21,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926194103] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:50:21,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707529182] [2022-11-25 23:50:21,628 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:50:21,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:21,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:50:21,635 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:50:21,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-11-25 23:50:21,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:21,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 1313 conjuncts, 118 conjunts are in the unsatisfiable core [2022-11-25 23:50:21,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:50:28,215 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:50:28,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:50:32,963 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 23:50:32,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707529182] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:50:32,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2106053841] [2022-11-25 23:50:32,964 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:50:32,964 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:50:32,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:50:32,965 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:50:32,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:50:33,051 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:50:34,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171194#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:50:34,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:34,367 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:50:34,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 118, 118] total 179 [2022-11-25 23:50:34,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746231655] [2022-11-25 23:50:34,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:34,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2022-11-25 23:50:34,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:34,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2022-11-25 23:50:34,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7287, Invalid=27869, Unknown=0, NotChecked=0, Total=35156 [2022-11-25 23:50:34,373 INFO L87 Difference]: Start difference. First operand 357 states and 359 transitions. Second operand has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:39,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:50:39,662 INFO L93 Difference]: Finished difference Result 770 states and 831 transitions. [2022-11-25 23:50:39,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-25 23:50:39,663 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 356 [2022-11-25 23:50:39,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:50:39,664 INFO L225 Difference]: With dead ends: 770 [2022-11-25 23:50:39,664 INFO L226 Difference]: Without dead ends: 533 [2022-11-25 23:50:39,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 885 SyntacticMatches, 114 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23029 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=14133, Invalid=46137, Unknown=0, NotChecked=0, Total=60270 [2022-11-25 23:50:39,668 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 564 mSDsluCounter, 1489 mSDsCounter, 0 mSdLazyCounter, 1656 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1607 SdHoareTripleChecker+Invalid, 1911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 1656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:50:39,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1607 Invalid, 1911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 1656 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:50:39,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-11-25 23:50:39,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 359. [2022-11-25 23:50:39,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 358 states have (on average 1.0083798882681565) internal successors, (361), 358 states have internal predecessors, (361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:39,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 361 transitions. [2022-11-25 23:50:39,734 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 361 transitions. Word has length 356 [2022-11-25 23:50:39,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:50:39,734 INFO L495 AbstractCegarLoop]: Abstraction has 359 states and 361 transitions. [2022-11-25 23:50:39,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:39,734 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 361 transitions. [2022-11-25 23:50:39,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2022-11-25 23:50:39,735 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:50:39,735 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 58, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:50:39,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2022-11-25 23:50:39,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2022-11-25 23:50:39,936 INFO L420 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:50:39,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:50:39,936 INFO L85 PathProgramCache]: Analyzing trace with hash -193930464, now seen corresponding path program 86 times [2022-11-25 23:50:39,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:50:39,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690981314] [2022-11-25 23:50:39,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:50:39,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:50:40,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:47,426 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6557 proven. 3593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:47,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:50:47,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690981314] [2022-11-25 23:50:47,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690981314] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:50:47,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698973955] [2022-11-25 23:50:47,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:50:47,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:47,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:50:47,427 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:50:47,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-11-25 23:50:47,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2022-11-25 23:50:47,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:50:47,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 1323 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-25 23:50:47,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:50:54,567 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6728 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:54,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:50:59,441 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6728 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:59,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698973955] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:50:59,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1383159900] [2022-11-25 23:50:59,442 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:50:59,442 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:50:59,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:50:59,443 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:50:59,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:50:59,556 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:51:00,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '175300#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:51:00,913 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:51:00,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:51:00,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 120, 120] total 181 [2022-11-25 23:51:00,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156064881] [2022-11-25 23:51:00,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:51:00,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2022-11-25 23:51:00,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:51:00,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2022-11-25 23:51:00,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7469, Invalid=28441, Unknown=0, NotChecked=0, Total=35910 [2022-11-25 23:51:00,919 INFO L87 Difference]: Start difference. First operand 359 states and 361 transitions. Second operand has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:06,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:06,251 INFO L93 Difference]: Finished difference Result 777 states and 839 transitions. [2022-11-25 23:51:06,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-11-25 23:51:06,251 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 358 [2022-11-25 23:51:06,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:06,252 INFO L225 Difference]: With dead ends: 777 [2022-11-25 23:51:06,252 INFO L226 Difference]: Without dead ends: 538 [2022-11-25 23:51:06,255 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1251 GetRequests, 888 SyntacticMatches, 116 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23536 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=14551, Invalid=47201, Unknown=0, NotChecked=0, Total=61752 [2022-11-25 23:51:06,255 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 722 mSDsluCounter, 1318 mSDsCounter, 0 mSdLazyCounter, 1502 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 722 SdHoareTripleChecker+Valid, 1438 SdHoareTripleChecker+Invalid, 1834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 1502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:06,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [722 Valid, 1438 Invalid, 1834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 1502 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:51:06,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2022-11-25 23:51:06,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 361. [2022-11-25 23:51:06,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 360 states have (on average 1.0083333333333333) internal successors, (363), 360 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:06,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 363 transitions. [2022-11-25 23:51:06,370 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 363 transitions. Word has length 358 [2022-11-25 23:51:06,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:06,370 INFO L495 AbstractCegarLoop]: Abstraction has 361 states and 363 transitions. [2022-11-25 23:51:06,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:06,371 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 363 transitions. [2022-11-25 23:51:06,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 361 [2022-11-25 23:51:06,373 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:06,373 INFO L195 NwaCegarLoop]: trace histogram [60, 59, 59, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:51:06,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:06,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:06,581 INFO L420 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:06,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:06,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1901810885, now seen corresponding path program 87 times [2022-11-25 23:51:06,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:06,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533252381] [2022-11-25 23:51:06,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:06,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:51:06,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:51:11,434 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3422 proven. 6846 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:51:11,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:51:11,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533252381] [2022-11-25 23:51:11,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533252381] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:51:11,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056988019] [2022-11-25 23:51:11,435 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:51:11,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:11,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:51:11,436 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:51:11,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-11-25 23:51:11,678 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:51:11,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:51:11,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 1333 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-25 23:51:11,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:51:12,201 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3540 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:51:12,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:51:15,465 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3540 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:51:15,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056988019] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:51:15,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153372184] [2022-11-25 23:51:15,467 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:51:15,467 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:51:15,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:51:15,467 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:51:15,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:51:15,565 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:51:16,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-25 23:51:16,239 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:51:16,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:51:16,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 65 [2022-11-25 23:51:16,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313670562] [2022-11-25 23:51:16,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:51:16,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-25 23:51:16,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:51:16,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-25 23:51:16,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2005, Invalid=3545, Unknown=0, NotChecked=0, Total=5550 [2022-11-25 23:51:16,241 INFO L87 Difference]: Start difference. First operand 361 states and 363 transitions. Second operand has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:18,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:18,121 INFO L93 Difference]: Finished difference Result 378 states and 381 transitions. [2022-11-25 23:51:18,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-11-25 23:51:18,122 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 360 [2022-11-25 23:51:18,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:18,124 INFO L225 Difference]: With dead ends: 378 [2022-11-25 23:51:18,124 INFO L226 Difference]: Without dead ends: 376 [2022-11-25 23:51:18,125 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1260 GetRequests, 1009 SyntacticMatches, 116 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8788 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=6040, Invalid=12592, Unknown=0, NotChecked=0, Total=18632 [2022-11-25 23:51:18,126 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 371 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 586 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:18,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [371 Valid, 495 Invalid, 590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 586 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:51:18,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-11-25 23:51:18,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 369. [2022-11-25 23:51:18,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 368 states have (on average 1.0081521739130435) internal successors, (371), 368 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:18,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 371 transitions. [2022-11-25 23:51:18,193 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 371 transitions. Word has length 360 [2022-11-25 23:51:18,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:18,193 INFO L495 AbstractCegarLoop]: Abstraction has 369 states and 371 transitions. [2022-11-25 23:51:18,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:18,193 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 371 transitions. [2022-11-25 23:51:18,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2022-11-25 23:51:18,194 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:18,195 INFO L195 NwaCegarLoop]: trace histogram [61, 60, 60, 60, 60, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:51:18,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:18,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc3f7eb3-c4ea-428c-910c-781ed09f1c59/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-11-25 23:51:18,395 INFO L420 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:18,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:18,395 INFO L85 PathProgramCache]: Analyzing trace with hash 490541483, now seen corresponding path program 88 times [2022-11-25 23:51:18,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:18,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772567405] [2022-11-25 23:51:18,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:18,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:51:18,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat