./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0b8de634f132d76c1b6698e4c3a5f12df478fc7c8b9ceb30d48afc80707f7564 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:02:37,955 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:02:37,958 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:02:38,001 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:02:38,002 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:02:38,004 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:02:38,006 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:02:38,008 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:02:38,011 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:02:38,012 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:02:38,014 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:02:38,015 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:02:38,016 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:02:38,018 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:02:38,020 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:02:38,022 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:02:38,023 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:02:38,025 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:02:38,028 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:02:38,031 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:02:38,033 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:02:38,035 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:02:38,037 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:02:38,038 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:02:38,043 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:02:38,044 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:02:38,044 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:02:38,046 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:02:38,047 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:02:38,049 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:02:38,049 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:02:38,051 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:02:38,052 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:02:38,053 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:02:38,055 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:02:38,055 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:02:38,056 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:02:38,056 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:02:38,056 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:02:38,057 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:02:38,058 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:02:38,059 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:02:38,113 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:02:38,122 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:02:38,123 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:02:38,124 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:02:38,132 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:02:38,133 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:02:38,133 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:02:38,134 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:02:38,134 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:02:38,135 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:02:38,136 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:02:38,136 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:02:38,137 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:02:38,137 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:02:38,137 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:02:38,138 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:02:38,138 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:02:38,138 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:02:38,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:02:38,141 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:02:38,141 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:02:38,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:02:38,142 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:02:38,142 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:02:38,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:02:38,143 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:02:38,145 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:02:38,145 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:02:38,145 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:02:38,146 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:02:38,146 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:02:38,147 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:02:38,147 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:02:38,147 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:02:38,148 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:02:38,148 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:02:38,148 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:02:38,149 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:02:38,149 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:02:38,149 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:02:38,150 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:02:38,150 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b8de634f132d76c1b6698e4c3a5f12df478fc7c8b9ceb30d48afc80707f7564 [2021-11-23 03:02:38,490 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:02:38,534 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:02:38,537 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:02:38,539 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:02:38,540 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:02:38,541 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c [2021-11-23 03:02:38,624 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/data/ac9c33f42/23ef6fbe0ba34ffa844479761f77aec1/FLAGa9a1606e3 [2021-11-23 03:02:39,283 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:02:39,284 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c [2021-11-23 03:02:39,303 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/data/ac9c33f42/23ef6fbe0ba34ffa844479761f77aec1/FLAGa9a1606e3 [2021-11-23 03:02:39,598 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/data/ac9c33f42/23ef6fbe0ba34ffa844479761f77aec1 [2021-11-23 03:02:39,606 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:02:39,607 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:02:39,623 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:02:39,623 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:02:39,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:02:39,628 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:02:39" (1/1) ... [2021-11-23 03:02:39,629 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@314d4b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:39, skipping insertion in model container [2021-11-23 03:02:39,630 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:02:39" (1/1) ... [2021-11-23 03:02:39,637 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:02:39,725 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:02:39,931 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c[911,924] [2021-11-23 03:02:40,034 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c[8416,8429] [2021-11-23 03:02:40,145 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:02:40,158 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:02:40,170 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c[911,924] [2021-11-23 03:02:40,193 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.11.cil-1.c[8416,8429] [2021-11-23 03:02:40,259 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:02:40,289 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:02:40,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40 WrapperNode [2021-11-23 03:02:40,290 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:02:40,296 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:02:40,296 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:02:40,296 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:02:40,306 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,339 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,446 INFO L137 Inliner]: procedures = 77, calls = 95, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 1025 [2021-11-23 03:02:40,447 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:02:40,448 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:02:40,448 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:02:40,448 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:02:40,459 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,466 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,466 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,490 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,515 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,522 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,533 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:02:40,534 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:02:40,534 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:02:40,534 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:02:40,536 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (1/1) ... [2021-11-23 03:02:40,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:02:40,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:40,600 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:02:40,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:02:40,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:02:40,660 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:02:40,660 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:02:40,660 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2021-11-23 03:02:40,661 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2021-11-23 03:02:40,661 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 03:02:40,661 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 03:02:40,661 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 03:02:40,662 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 03:02:40,662 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2021-11-23 03:02:40,662 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2021-11-23 03:02:40,662 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 03:02:40,662 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 03:02:40,663 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 03:02:40,663 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 03:02:40,663 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2021-11-23 03:02:40,663 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2021-11-23 03:02:40,663 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2021-11-23 03:02:40,664 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2021-11-23 03:02:40,664 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2021-11-23 03:02:40,664 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2021-11-23 03:02:40,664 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 03:02:40,665 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 03:02:40,665 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:02:40,665 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 03:02:40,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 03:02:40,666 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2021-11-23 03:02:40,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2021-11-23 03:02:40,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:02:40,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:02:40,668 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 03:02:40,669 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 03:02:40,669 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 03:02:40,669 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 03:02:40,870 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:02:40,872 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:02:41,872 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2021-11-23 03:02:41,872 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2021-11-23 03:02:41,956 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:02:42,445 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:02:42,445 INFO L301 CfgBuilder]: Removed 18 assume(true) statements. [2021-11-23 03:02:42,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:02:42 BoogieIcfgContainer [2021-11-23 03:02:42,452 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:02:42,456 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:02:42,456 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:02:42,460 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:02:42,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:02:39" (1/3) ... [2021-11-23 03:02:42,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@276a84cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:02:42, skipping insertion in model container [2021-11-23 03:02:42,462 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:02:40" (2/3) ... [2021-11-23 03:02:42,463 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@276a84cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:02:42, skipping insertion in model container [2021-11-23 03:02:42,463 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:02:42" (3/3) ... [2021-11-23 03:02:42,464 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.11.cil-1.c [2021-11-23 03:02:42,471 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:02:42,471 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:02:42,553 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:02:42,564 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:02:42,565 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:02:42,618 INFO L276 IsEmpty]: Start isEmpty. Operand has 262 states, 201 states have (on average 1.5472636815920398) internal successors, (311), 209 states have internal predecessors, (311), 43 states have call successors, (43), 15 states have call predecessors, (43), 15 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) [2021-11-23 03:02:42,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 03:02:42,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:42,628 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:42,628 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:42,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:42,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1723582248, now seen corresponding path program 1 times [2021-11-23 03:02:42,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:42,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294991424] [2021-11-23 03:02:42,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:42,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:42,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:42,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:02:42,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:42,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294991424] [2021-11-23 03:02:42,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294991424] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:42,962 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:02:42,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:02:42,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096794718] [2021-11-23 03:02:42,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:42,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:02:42,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:43,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:02:43,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:02:43,029 INFO L87 Difference]: Start difference. First operand has 262 states, 201 states have (on average 1.5472636815920398) internal successors, (311), 209 states have internal predecessors, (311), 43 states have call successors, (43), 15 states have call predecessors, (43), 15 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:02:43,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:43,581 INFO L93 Difference]: Finished difference Result 646 states and 972 transitions. [2021-11-23 03:02:43,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:02:43,584 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2021-11-23 03:02:43,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:43,610 INFO L225 Difference]: With dead ends: 646 [2021-11-23 03:02:43,610 INFO L226 Difference]: Without dead ends: 385 [2021-11-23 03:02:43,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:02:43,625 INFO L933 BasicCegarLoop]: 388 mSDtfsCounter, 447 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 447 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:43,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [447 Valid, 690 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:02:43,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-11-23 03:02:43,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 374. [2021-11-23 03:02:43,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 282 states have (on average 1.4574468085106382) internal successors, (411), 287 states have internal predecessors, (411), 63 states have call successors, (63), 29 states have call predecessors, (63), 27 states have return successors, (62), 59 states have call predecessors, (62), 59 states have call successors, (62) [2021-11-23 03:02:43,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 536 transitions. [2021-11-23 03:02:43,736 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 536 transitions. Word has length 44 [2021-11-23 03:02:43,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:43,737 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 536 transitions. [2021-11-23 03:02:43,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:02:43,737 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 536 transitions. [2021-11-23 03:02:43,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 03:02:43,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:43,740 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:43,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:02:43,741 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:43,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:43,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1866101275, now seen corresponding path program 1 times [2021-11-23 03:02:43,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:43,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843870782] [2021-11-23 03:02:43,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:43,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:43,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:43,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:02:43,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:43,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843870782] [2021-11-23 03:02:43,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843870782] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:43,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:02:43,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:02:43,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049310398] [2021-11-23 03:02:43,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:43,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:02:43,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:43,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:02:43,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:43,910 INFO L87 Difference]: Start difference. First operand 374 states and 536 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:02:44,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:44,962 INFO L93 Difference]: Finished difference Result 911 states and 1259 transitions. [2021-11-23 03:02:44,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:02:44,963 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-11-23 03:02:44,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:44,968 INFO L225 Difference]: With dead ends: 911 [2021-11-23 03:02:44,968 INFO L226 Difference]: Without dead ends: 445 [2021-11-23 03:02:44,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:02:44,972 INFO L933 BasicCegarLoop]: 460 mSDtfsCounter, 954 mSDsluCounter, 916 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 296 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 963 SdHoareTripleChecker+Valid, 1181 SdHoareTripleChecker+Invalid, 1099 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 296 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:44,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [963 Valid, 1181 Invalid, 1099 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [296 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:02:44,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2021-11-23 03:02:45,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 360. [2021-11-23 03:02:45,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 268 states have (on average 1.4104477611940298) internal successors, (378), 273 states have internal predecessors, (378), 63 states have call successors, (63), 29 states have call predecessors, (63), 27 states have return successors, (59), 59 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-23 03:02:45,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 500 transitions. [2021-11-23 03:02:45,044 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 500 transitions. Word has length 45 [2021-11-23 03:02:45,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:45,045 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 500 transitions. [2021-11-23 03:02:45,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:02:45,047 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 500 transitions. [2021-11-23 03:02:45,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:02:45,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:45,057 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:45,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:02:45,058 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:45,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:45,059 INFO L85 PathProgramCache]: Analyzing trace with hash -96222000, now seen corresponding path program 1 times [2021-11-23 03:02:45,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:45,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534142161] [2021-11-23 03:02:45,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:45,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:45,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:45,228 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:02:45,228 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:45,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534142161] [2021-11-23 03:02:45,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534142161] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:45,229 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:02:45,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:02:45,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051939870] [2021-11-23 03:02:45,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:45,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:02:45,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:45,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:02:45,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:02:45,231 INFO L87 Difference]: Start difference. First operand 360 states and 500 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 03:02:46,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:46,126 INFO L93 Difference]: Finished difference Result 662 states and 868 transitions. [2021-11-23 03:02:46,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:02:46,126 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-11-23 03:02:46,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:46,130 INFO L225 Difference]: With dead ends: 662 [2021-11-23 03:02:46,130 INFO L226 Difference]: Without dead ends: 488 [2021-11-23 03:02:46,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:02:46,132 INFO L933 BasicCegarLoop]: 299 mSDtfsCounter, 535 mSDsluCounter, 1104 mSDsCounter, 0 mSdLazyCounter, 1037 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 1202 SdHoareTripleChecker+Invalid, 1153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 1037 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:46,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [567 Valid, 1202 Invalid, 1153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 1037 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:02:46,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-11-23 03:02:46,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 462. [2021-11-23 03:02:46,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 336 states have (on average 1.369047619047619) internal successors, (460), 341 states have internal predecessors, (460), 83 states have call successors, (83), 43 states have call predecessors, (83), 41 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2021-11-23 03:02:46,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 622 transitions. [2021-11-23 03:02:46,173 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 622 transitions. Word has length 46 [2021-11-23 03:02:46,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:46,173 INFO L470 AbstractCegarLoop]: Abstraction has 462 states and 622 transitions. [2021-11-23 03:02:46,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 03:02:46,174 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 622 transitions. [2021-11-23 03:02:46,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:02:46,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:46,175 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:46,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:02:46,176 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:46,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:46,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1154170382, now seen corresponding path program 1 times [2021-11-23 03:02:46,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:46,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861633631] [2021-11-23 03:02:46,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:46,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:46,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:46,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:02:46,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:46,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861633631] [2021-11-23 03:02:46,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861633631] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:46,221 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:02:46,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:02:46,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888237402] [2021-11-23 03:02:46,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:46,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:02:46,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:46,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:02:46,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:02:46,223 INFO L87 Difference]: Start difference. First operand 462 states and 622 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:46,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:46,336 INFO L93 Difference]: Finished difference Result 727 states and 958 transitions. [2021-11-23 03:02:46,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:02:46,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2021-11-23 03:02:46,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:46,339 INFO L225 Difference]: With dead ends: 727 [2021-11-23 03:02:46,339 INFO L226 Difference]: Without dead ends: 181 [2021-11-23 03:02:46,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:02:46,352 INFO L933 BasicCegarLoop]: 300 mSDtfsCounter, 347 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:46,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [347 Valid, 300 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:02:46,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-23 03:02:46,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2021-11-23 03:02:46,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 147 states have (on average 1.530612244897959) internal successors, (225), 149 states have internal predecessors, (225), 27 states have call successors, (27), 7 states have call predecessors, (27), 6 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-23 03:02:46,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 277 transitions. [2021-11-23 03:02:46,373 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 277 transitions. Word has length 47 [2021-11-23 03:02:46,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:46,375 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 277 transitions. [2021-11-23 03:02:46,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:46,375 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 277 transitions. [2021-11-23 03:02:46,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 03:02:46,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:46,381 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:46,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:02:46,382 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:46,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:46,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1655544255, now seen corresponding path program 1 times [2021-11-23 03:02:46,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:46,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427300387] [2021-11-23 03:02:46,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:46,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:46,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:46,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:02:46,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:46,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427300387] [2021-11-23 03:02:46,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427300387] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:46,550 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:02:46,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:02:46,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552237367] [2021-11-23 03:02:46,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:46,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:02:46,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:46,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:02:46,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:02:46,555 INFO L87 Difference]: Start difference. First operand 181 states and 277 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:02:47,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:47,460 INFO L93 Difference]: Finished difference Result 1014 states and 1655 transitions. [2021-11-23 03:02:47,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:02:47,461 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 65 [2021-11-23 03:02:47,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:47,472 INFO L225 Difference]: With dead ends: 1014 [2021-11-23 03:02:47,473 INFO L226 Difference]: Without dead ends: 839 [2021-11-23 03:02:47,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:02:47,480 INFO L933 BasicCegarLoop]: 515 mSDtfsCounter, 1243 mSDsluCounter, 934 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1259 SdHoareTripleChecker+Valid, 1276 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:47,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1259 Valid, 1276 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:02:47,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2021-11-23 03:02:47,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 826. [2021-11-23 03:02:47,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 826 states, 687 states have (on average 1.526928675400291) internal successors, (1049), 692 states have internal predecessors, (1049), 108 states have call successors, (108), 31 states have call predecessors, (108), 30 states have return successors, (164), 103 states have call predecessors, (164), 106 states have call successors, (164) [2021-11-23 03:02:47,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 826 states to 826 states and 1321 transitions. [2021-11-23 03:02:47,581 INFO L78 Accepts]: Start accepts. Automaton has 826 states and 1321 transitions. Word has length 65 [2021-11-23 03:02:47,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:47,582 INFO L470 AbstractCegarLoop]: Abstraction has 826 states and 1321 transitions. [2021-11-23 03:02:47,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:02:47,582 INFO L276 IsEmpty]: Start isEmpty. Operand 826 states and 1321 transitions. [2021-11-23 03:02:47,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:02:47,586 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:47,587 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:47,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:02:47,587 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:47,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:47,588 INFO L85 PathProgramCache]: Analyzing trace with hash 2034024163, now seen corresponding path program 1 times [2021-11-23 03:02:47,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:47,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019992119] [2021-11-23 03:02:47,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:47,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:47,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:47,730 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:02:47,731 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:47,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019992119] [2021-11-23 03:02:47,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019992119] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:47,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615145743] [2021-11-23 03:02:47,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:47,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:47,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:47,738 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:47,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:02:48,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:48,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:02:48,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:48,342 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:02:48,342 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:02:48,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615145743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:48,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:02:48,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:02:48,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398736111] [2021-11-23 03:02:48,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:48,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:02:48,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:48,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:02:48,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:48,347 INFO L87 Difference]: Start difference. First operand 826 states and 1321 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:48,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:48,583 INFO L93 Difference]: Finished difference Result 2450 states and 4036 transitions. [2021-11-23 03:02:48,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:02:48,584 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 03:02:48,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:48,599 INFO L225 Difference]: With dead ends: 2450 [2021-11-23 03:02:48,600 INFO L226 Difference]: Without dead ends: 1630 [2021-11-23 03:02:48,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:48,608 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 225 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:48,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 465 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:02:48,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1630 states. [2021-11-23 03:02:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1630 to 1621. [2021-11-23 03:02:48,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1621 states, 1355 states have (on average 1.5232472324723247) internal successors, (2064), 1363 states have internal predecessors, (2064), 205 states have call successors, (205), 61 states have call predecessors, (205), 60 states have return successors, (315), 197 states have call predecessors, (315), 203 states have call successors, (315) [2021-11-23 03:02:48,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1621 states to 1621 states and 2584 transitions. [2021-11-23 03:02:48,740 INFO L78 Accepts]: Start accepts. Automaton has 1621 states and 2584 transitions. Word has length 130 [2021-11-23 03:02:48,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:48,741 INFO L470 AbstractCegarLoop]: Abstraction has 1621 states and 2584 transitions. [2021-11-23 03:02:48,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:48,742 INFO L276 IsEmpty]: Start isEmpty. Operand 1621 states and 2584 transitions. [2021-11-23 03:02:48,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:02:48,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:48,753 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:48,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:48,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:02:48,967 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:48,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:48,967 INFO L85 PathProgramCache]: Analyzing trace with hash -420048159, now seen corresponding path program 1 times [2021-11-23 03:02:48,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:48,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266704269] [2021-11-23 03:02:48,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:48,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:48,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:49,055 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:02:49,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:49,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266704269] [2021-11-23 03:02:49,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266704269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:49,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750754528] [2021-11-23 03:02:49,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:49,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:49,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:49,062 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:49,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:02:49,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:49,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 991 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:02:49,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:49,663 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:02:49,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:02:49,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750754528] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:49,667 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:02:49,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:02:49,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132467679] [2021-11-23 03:02:49,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:49,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:02:49,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:49,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:02:49,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:49,671 INFO L87 Difference]: Start difference. First operand 1621 states and 2584 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:50,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:50,072 INFO L93 Difference]: Finished difference Result 4820 states and 7908 transitions. [2021-11-23 03:02:50,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:02:50,073 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 03:02:50,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:50,107 INFO L225 Difference]: With dead ends: 4820 [2021-11-23 03:02:50,107 INFO L226 Difference]: Without dead ends: 3205 [2021-11-23 03:02:50,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:50,120 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 246 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:50,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 465 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:02:50,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3205 states. [2021-11-23 03:02:50,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3205 to 3191. [2021-11-23 03:02:50,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3191 states, 2676 states have (on average 1.5186846038863977) internal successors, (4064), 2690 states have internal predecessors, (4064), 394 states have call successors, (394), 121 states have call predecessors, (394), 120 states have return successors, (608), 380 states have call predecessors, (608), 392 states have call successors, (608) [2021-11-23 03:02:50,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3191 states to 3191 states and 5066 transitions. [2021-11-23 03:02:50,398 INFO L78 Accepts]: Start accepts. Automaton has 3191 states and 5066 transitions. Word has length 130 [2021-11-23 03:02:50,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:50,399 INFO L470 AbstractCegarLoop]: Abstraction has 3191 states and 5066 transitions. [2021-11-23 03:02:50,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:50,399 INFO L276 IsEmpty]: Start isEmpty. Operand 3191 states and 5066 transitions. [2021-11-23 03:02:50,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:02:50,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:50,410 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:50,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:50,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:50,625 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:50,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:50,626 INFO L85 PathProgramCache]: Analyzing trace with hash 677235107, now seen corresponding path program 1 times [2021-11-23 03:02:50,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:50,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17604463] [2021-11-23 03:02:50,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:50,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:50,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:50,712 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:02:50,713 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:50,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17604463] [2021-11-23 03:02:50,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17604463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:50,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185946705] [2021-11-23 03:02:50,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:50,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:50,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:50,723 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:50,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:02:50,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:50,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 985 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:02:50,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:51,185 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 03:02:51,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:02:51,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185946705] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:51,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:02:51,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:02:51,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764079577] [2021-11-23 03:02:51,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:51,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:02:51,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:51,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:02:51,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:51,189 INFO L87 Difference]: Start difference. First operand 3191 states and 5066 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:51,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:51,676 INFO L93 Difference]: Finished difference Result 9500 states and 15511 transitions. [2021-11-23 03:02:51,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:02:51,677 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 03:02:51,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:51,757 INFO L225 Difference]: With dead ends: 9500 [2021-11-23 03:02:51,757 INFO L226 Difference]: Without dead ends: 6315 [2021-11-23 03:02:51,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:51,779 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 249 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:51,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 465 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:02:51,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6315 states. [2021-11-23 03:02:52,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6315 to 6291. [2021-11-23 03:02:52,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6291 states, 5288 states have (on average 1.5136157337367624) internal successors, (8004), 5314 states have internal predecessors, (8004), 762 states have call successors, (762), 241 states have call predecessors, (762), 240 states have return successors, (1176), 736 states have call predecessors, (1176), 760 states have call successors, (1176) [2021-11-23 03:02:52,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6291 states to 6291 states and 9942 transitions. [2021-11-23 03:02:52,330 INFO L78 Accepts]: Start accepts. Automaton has 6291 states and 9942 transitions. Word has length 130 [2021-11-23 03:02:52,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:52,330 INFO L470 AbstractCegarLoop]: Abstraction has 6291 states and 9942 transitions. [2021-11-23 03:02:52,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:52,331 INFO L276 IsEmpty]: Start isEmpty. Operand 6291 states and 9942 transitions. [2021-11-23 03:02:52,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:02:52,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:52,345 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:52,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:52,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:52,571 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:52,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:52,571 INFO L85 PathProgramCache]: Analyzing trace with hash 846922657, now seen corresponding path program 1 times [2021-11-23 03:02:52,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:52,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139448539] [2021-11-23 03:02:52,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:52,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:52,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:52,657 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:02:52,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:52,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139448539] [2021-11-23 03:02:52,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139448539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:52,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647813426] [2021-11-23 03:02:52,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:52,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:52,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:52,667 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:52,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:02:52,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:52,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 979 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:02:52,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:53,173 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 03:02:53,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:02:53,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647813426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:53,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:02:53,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:02:53,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667395183] [2021-11-23 03:02:53,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:53,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:02:53,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:53,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:02:53,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:53,177 INFO L87 Difference]: Start difference. First operand 6291 states and 9942 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:53,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:53,986 INFO L93 Difference]: Finished difference Result 18740 states and 30435 transitions. [2021-11-23 03:02:53,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:02:53,987 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 03:02:53,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:54,140 INFO L225 Difference]: With dead ends: 18740 [2021-11-23 03:02:54,141 INFO L226 Difference]: Without dead ends: 12455 [2021-11-23 03:02:54,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:54,248 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 240 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:54,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 465 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:02:54,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12455 states. [2021-11-23 03:02:55,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12455 to 12411. [2021-11-23 03:02:55,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12411 states, 10452 states have (on average 1.5082280903176426) internal successors, (15764), 10502 states have internal predecessors, (15764), 1478 states have call successors, (1478), 481 states have call predecessors, (1478), 480 states have return successors, (2276), 1428 states have call predecessors, (2276), 1476 states have call successors, (2276) [2021-11-23 03:02:55,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12411 states to 12411 states and 19518 transitions. [2021-11-23 03:02:55,353 INFO L78 Accepts]: Start accepts. Automaton has 12411 states and 19518 transitions. Word has length 130 [2021-11-23 03:02:55,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:55,354 INFO L470 AbstractCegarLoop]: Abstraction has 12411 states and 19518 transitions. [2021-11-23 03:02:55,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:55,356 INFO L276 IsEmpty]: Start isEmpty. Operand 12411 states and 19518 transitions. [2021-11-23 03:02:55,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:02:55,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:55,383 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:55,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:55,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:55,599 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:55,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:55,599 INFO L85 PathProgramCache]: Analyzing trace with hash -2076511261, now seen corresponding path program 1 times [2021-11-23 03:02:55,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:55,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330060739] [2021-11-23 03:02:55,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:55,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:55,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:55,698 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:02:55,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:55,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330060739] [2021-11-23 03:02:55,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330060739] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:55,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583704586] [2021-11-23 03:02:55,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:55,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:55,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:55,701 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:55,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:02:55,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:55,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:02:55,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:56,187 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:02:56,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:02:56,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583704586] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:56,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:02:56,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:02:56,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125209013] [2021-11-23 03:02:56,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:56,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:02:56,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:56,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:02:56,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:56,191 INFO L87 Difference]: Start difference. First operand 12411 states and 19518 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:57,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:57,826 INFO L93 Difference]: Finished difference Result 36980 states and 59719 transitions. [2021-11-23 03:02:57,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:02:57,827 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 03:02:57,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:57,971 INFO L225 Difference]: With dead ends: 36980 [2021-11-23 03:02:57,972 INFO L226 Difference]: Without dead ends: 24575 [2021-11-23 03:02:58,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:02:58,031 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 234 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:58,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 465 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:02:58,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24575 states. [2021-11-23 03:02:59,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24575 to 24491. [2021-11-23 03:02:59,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24491 states, 20660 states have (on average 1.5026137463697966) internal successors, (31044), 20758 states have internal predecessors, (31044), 2870 states have call successors, (2870), 961 states have call predecessors, (2870), 960 states have return successors, (4404), 2772 states have call predecessors, (4404), 2868 states have call successors, (4404) [2021-11-23 03:02:59,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24491 states to 24491 states and 38318 transitions. [2021-11-23 03:02:59,884 INFO L78 Accepts]: Start accepts. Automaton has 24491 states and 38318 transitions. Word has length 130 [2021-11-23 03:02:59,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:59,885 INFO L470 AbstractCegarLoop]: Abstraction has 24491 states and 38318 transitions. [2021-11-23 03:02:59,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:02:59,885 INFO L276 IsEmpty]: Start isEmpty. Operand 24491 states and 38318 transitions. [2021-11-23 03:02:59,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:02:59,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:59,933 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:59,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:03:00,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:03:00,155 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:03:00,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:03:00,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1606204837, now seen corresponding path program 1 times [2021-11-23 03:03:00,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:03:00,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100499762] [2021-11-23 03:03:00,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:03:00,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:03:00,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:03:00,306 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:03:00,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:03:00,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100499762] [2021-11-23 03:03:00,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100499762] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:03:00,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659738498] [2021-11-23 03:03:00,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:03:00,308 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:03:00,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:03:00,314 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:03:00,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:03:00,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:03:00,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:03:00,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:03:00,861 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:03:00,862 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:03:00,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659738498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:03:00,862 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:03:00,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:03:00,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335193555] [2021-11-23 03:03:00,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:03:00,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:03:00,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:03:00,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:03:00,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:03:00,864 INFO L87 Difference]: Start difference. First operand 24491 states and 38318 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:03:02,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:03:02,830 INFO L93 Difference]: Finished difference Result 72980 states and 117159 transitions. [2021-11-23 03:03:02,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:03:02,831 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 03:03:02,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:03:03,111 INFO L225 Difference]: With dead ends: 72980 [2021-11-23 03:03:03,111 INFO L226 Difference]: Without dead ends: 48495 [2021-11-23 03:03:03,210 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:03:03,211 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 228 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:03:03,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 465 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:03:03,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48495 states. [2021-11-23 03:03:05,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48495 to 48331. [2021-11-23 03:03:05,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48331 states, 40836 states have (on average 1.4968165344304045) internal successors, (61124), 41030 states have internal predecessors, (61124), 5574 states have call successors, (5574), 1921 states have call predecessors, (5574), 1920 states have return successors, (8516), 5380 states have call predecessors, (8516), 5572 states have call successors, (8516) [2021-11-23 03:03:06,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48331 states to 48331 states and 75214 transitions. [2021-11-23 03:03:06,564 INFO L78 Accepts]: Start accepts. Automaton has 48331 states and 75214 transitions. Word has length 130 [2021-11-23 03:03:06,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:03:06,565 INFO L470 AbstractCegarLoop]: Abstraction has 48331 states and 75214 transitions. [2021-11-23 03:03:06,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:03:06,566 INFO L276 IsEmpty]: Start isEmpty. Operand 48331 states and 75214 transitions. [2021-11-23 03:03:06,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:03:06,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:03:06,726 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:03:06,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:03:06,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8135d46c-b2e9-48fa-8e99-e5bf9e4e8a44/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:03:06,939 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:03:06,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:03:06,939 INFO L85 PathProgramCache]: Analyzing trace with hash 1270972647, now seen corresponding path program 1 times [2021-11-23 03:03:06,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:03:06,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184363427] [2021-11-23 03:03:06,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:03:06,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:03:07,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:03:07,136 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:03:07,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:03:07,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184363427] [2021-11-23 03:03:07,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184363427] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:03:07,138 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:03:07,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:03:07,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627324647] [2021-11-23 03:03:07,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:03:07,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:03:07,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:03:07,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:03:07,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:03:07,141 INFO L87 Difference]: Start difference. First operand 48331 states and 75214 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:03:12,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:03:12,640 INFO L93 Difference]: Finished difference Result 166099 states and 260245 transitions. [2021-11-23 03:03:12,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:03:12,640 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 130 [2021-11-23 03:03:12,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:03:13,758 INFO L225 Difference]: With dead ends: 166099 [2021-11-23 03:03:13,758 INFO L226 Difference]: Without dead ends: 117775 [2021-11-23 03:03:13,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:03:13,987 INFO L933 BasicCegarLoop]: 252 mSDtfsCounter, 970 mSDsluCounter, 677 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 990 SdHoareTripleChecker+Valid, 814 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:03:13,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [990 Valid, 814 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:03:14,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117775 states. [2021-11-23 03:03:19,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117775 to 94731. [2021-11-23 03:03:19,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94731 states, 80068 states have (on average 1.490782834590598) internal successors, (119364), 80454 states have internal predecessors, (119364), 10822 states have call successors, (10822), 3841 states have call predecessors, (10822), 3840 states have return successors, (16452), 10436 states have call predecessors, (16452), 10820 states have call successors, (16452) [2021-11-23 03:03:20,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94731 states to 94731 states and 146638 transitions. [2021-11-23 03:03:20,404 INFO L78 Accepts]: Start accepts. Automaton has 94731 states and 146638 transitions. Word has length 130 [2021-11-23 03:03:20,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:03:20,406 INFO L470 AbstractCegarLoop]: Abstraction has 94731 states and 146638 transitions. [2021-11-23 03:03:20,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:03:20,407 INFO L276 IsEmpty]: Start isEmpty. Operand 94731 states and 146638 transitions. [2021-11-23 03:03:20,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 03:03:20,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:03:20,533 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:03:20,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:03:20,534 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:03:20,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:03:20,535 INFO L85 PathProgramCache]: Analyzing trace with hash -587120359, now seen corresponding path program 1 times [2021-11-23 03:03:20,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:03:20,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891578908] [2021-11-23 03:03:20,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:03:20,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:03:20,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:03:20,725 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:03:20,726 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:03:20,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891578908] [2021-11-23 03:03:20,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891578908] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:03:20,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:03:20,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:03:20,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883540677] [2021-11-23 03:03:20,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:03:20,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:03:20,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:03:20,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:03:20,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:03:20,729 INFO L87 Difference]: Start difference. First operand 94731 states and 146638 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:03:28,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:03:28,793 INFO L93 Difference]: Finished difference Result 254099 states and 396852 transitions. [2021-11-23 03:03:28,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:03:28,794 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 131 [2021-11-23 03:03:28,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:03:30,057 INFO L225 Difference]: With dead ends: 254099 [2021-11-23 03:03:30,058 INFO L226 Difference]: Without dead ends: 159375 [2021-11-23 03:03:30,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:03:30,357 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 895 mSDsluCounter, 559 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 901 SdHoareTripleChecker+Valid, 711 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:03:30,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [901 Valid, 711 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:03:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159375 states. [2021-11-23 03:03:37,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159375 to 140811. [2021-11-23 03:03:37,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140811 states, 118980 states have (on average 1.4859976466633047) internal successors, (176804), 119558 states have internal predecessors, (176804), 16070 states have call successors, (16070), 5761 states have call predecessors, (16070), 5760 states have return successors, (24388), 15492 states have call predecessors, (24388), 16068 states have call successors, (24388) [2021-11-23 03:03:39,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140811 states to 140811 states and 217262 transitions. [2021-11-23 03:03:39,282 INFO L78 Accepts]: Start accepts. Automaton has 140811 states and 217262 transitions. Word has length 131 [2021-11-23 03:03:39,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:03:39,282 INFO L470 AbstractCegarLoop]: Abstraction has 140811 states and 217262 transitions. [2021-11-23 03:03:39,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:03:39,283 INFO L276 IsEmpty]: Start isEmpty. Operand 140811 states and 217262 transitions. [2021-11-23 03:03:39,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 03:03:39,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:03:39,481 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:03:39,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:03:39,481 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:03:39,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:03:39,482 INFO L85 PathProgramCache]: Analyzing trace with hash -621234521, now seen corresponding path program 1 times [2021-11-23 03:03:39,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:03:39,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926453481] [2021-11-23 03:03:39,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:03:39,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:03:39,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:03:39,646 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:03:39,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:03:39,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926453481] [2021-11-23 03:03:39,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926453481] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:03:39,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:03:39,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:03:39,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211183627] [2021-11-23 03:03:39,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:03:39,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:03:39,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:03:39,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:03:39,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:03:39,650 INFO L87 Difference]: Start difference. First operand 140811 states and 217262 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)